Goldstone Radar Observations Planning:

2011 JR13, 2013 WF108, Comet 209P/LINEAR, and 2014 JL25


Background


This is a planning page for Goldstone radar observations of three near-Earth asteroids and one comet during
ten tracks on May 19 - June 5/6.   Below is some background information on each object.



2011 JR13
2011 JR13 was discovered by LINEAR on May 10, 2011.
Its absolute magnitude of 19.6 suggests a diameter within a factor of two of 0.4 km, but
otherwise its physical properties are unknown.  

2011 JR13 will approach within 0.051 AU on May 21, 2014.  The SNRs might be strong enough to obtain
ranging measurements but we do not expect it to be strong enough for high-resolution imaging.
Four tracks are scheduled at Goldstone, one of which overlaps with 2013 WF108 (on May 22).


2013 WF108
2013 WF108 was discovered on Nov. 27, 2013 by Pan-STARRS1.  It has an absolute magnitude of 20.0, suggesting a 
diameter of roughly 300 m, but otherwise its physical properties are unknown.  It will approach within 0.029 AU
on May 23 when the SNRs should be strong enough for imaging.  

The view periods for 2013 WF108 and 2011 JR13 overlap on May 22.  There is also extensive overlap with  
Comet 209P/LINEAR on May 26-31.

NOTE: optical astrometry is needed before the radar observations start because the pointing uncertainties are large.
It turns out that additional optical astrometry never materialized, but the asteroid was evidently close
to the nominal predicted position because we saw echoes quickly.


Comet 209P/LINEAR 2004 CB
Comet LINEAR was discovered on February 3, 2004, initially classified as asteroid 2004 CB, and then 
reclassified as comet LINEAR after cometary activity was detected.   It will approach within 0.055 AU on May 29.

On May 16, Carl Hergenrother (Univ. of Arizona) reported that the rotation period is about 22 h,
with a lightcurve amplitude of 0.7 mag, and that the absolute magnitude of the nucleus is between 16.4-17.0. 
Most comets have very low albedos, so if the albedo of comet LINEAR is less than 0.08, which seems likely, then
the absolute magnitude indicates that the diameter is *at least* 1.9 km.  It's possible that it could be as
large as 4 km.  The slow rotation period and large diameter indicate that this is going to be a very 
strong radar imaging target and possibly the best opportunity to image a comet that we've ever had.

As of early May, this comet has a faint coma and a short tail, but we do not know if the coma will be detectable or not.

Dynamical modeling by Lyytinen and Jenniskens predicts that debris shed by this comet may produce a 
strong but brief meteor shower on the night of May 23-24.  An article on Science@NASA is available at:
http://science1.nasa.gov/science-news/science-at-nasa/2014/06may_newshower/
The meteor shower could be quite strong with rates of up to 200/hour at the peak (which is only a few hours long),
or it could be a complete fizzle. 

This comet may brighten to about 11th magnitude, possibly bringing it within reach of small telescopes.


2014 JL25
2014 JL25 was discovered by NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft on May 4.  Thermal 
modeling of the WISE data by A. K. Mainzer strongly suggests that this asteroid is optically dark and that
it has a diameter of about 290 meters.  The WISE data hint that the asteroid may have a high thermal inertia 
and/or a slow rotation period.    This object is in a cometary orbit but so far no signs of cometary 
activity are visible.

This asteroid will approach within 0.026 AU (10 lunar distances) on June 5.  Due to its diameter, we should 
be able to detect radar echoes from 2014 JL25 during time already scheduled for observations of Comet 209P/LINEAR
on May 28, 29, and 31.  At the time of the closest approach, 2014 JL25 could be a strong imaging target.
One additional track is also scheduled on June 5/6 when the SNRs should be close to their peak.

The Goldstone data will help to calibrate the diameter estimated from the WISE data, so in a very real sense,
the Goldstone observations will be directly supporting a NASA mission.  For that reason these observations
are quite important.   


The Minor Planet Center has classified 2011 JR13 and 2013 WF108 as "Potentially Hazardous Asteroids."
Orbital and Physical Characteristics
Provisional Designation  2011 JR13      2013 WF108    Comet LINEAR  2014 JL25      
Asteroid number          Not numbered   Not numbered  209P          Not numbered
Discoverer               LINEAR         Pan-STARRS1   LINEAR        WISE
Discovery date           2011 May 10    2013 Nov 27   2004 Feb 03   2014 May 04
Orbit type               Apollo         Apollo        JFC           Apollo
Close approach dist.     0.051 AU       0.029 AU      0.055         0.026
Close approach dist.     19.7 LD        11.3 LD       21.6 LD       10.1 LD    LD = lunar distance        
Close approach date      May 21         May 23        May 29        Jun  5

semimajor axis           1.299 AU       1.992 AU      2.938 AU      2.861 AU
eccentricity             0.726          0.574         0.689         0.652
inclination             24.7 deg        23.5 deg      19.1 deg      15.7 deg
perihelion distance      0.356 AU       0.849 AU      0.914 AU      0.996 AU
aphelion distance        2.242 AU       3.135 AU      4.962 AU      4.727 AU
Tisserand parameter      4.629          3.539                       2.914

absolute magnitude (H)   19.6           20.0                        22.6
diameter                 0.38 km        0.32 km       1.9 km+       0.29 km
optical albedo           unknown        unknown       unknown       very dark
rotation period          unknown        unknown       21.9 h        unknown 
pole direction           unknown        unknown       unknown       unknown 
lightcurve amplitude     unknown        unknown       0.7 mag       unknown 
spectral class           unknown        unknown       unknown       optically dark
                         PHA            PHA           N/A 

Last update: 2014 May 28

Discovery M.P.E.C.s

2011 JR13
http://www.minorplanetcenter.net/mpec/K11/K11J46.html

Comet 209P/LINEAR
http://www.minorplanetcenter.net/mpec/K04/K04C16.html

2013 WF108
http://www.minorplanetcenter.net/mpec/K13/K13X40.html

2014 JL25
http://www.minorplanetcenter.net/mpec/K14/K14J71.html

SNR Calculations

2011 JR13

GOLDSTONE SNRs

Assumptions: D = 0.4 km,  P = 2.2 h,  OC albedo = 0.1
                                                                     SNR/   SNR/
w  DOY      start date     window        RA, dec   dist     runs     day    run
20 137      2014 May 17    06:10-14:40   273,  -2  0.076     217      19      1
20 138      2014 May 18    05:50-15:15   276,  +7  0.065     276      38      2     
21 139      2014 May 19    05:30-16:05   279, +19  0.056     350      69      4   Scheduled
21 140      2014 May 20    05:10-17:10   285, +35  0.051     433     100      6   Scheduled
21 141      2014 May 21    04:50-19:00   296, +51  0.051     508     120      6   Scheduled
21 142      2014 May 22    04:40-22:15   314, +65  0.056     588      90      4   Scheduled
21 143-144  2014 May 23-24 04:45-02:10   348, +73  0.065     647      54      2
21 144-145  2014 May 24-25 06:05-03:05    22, +72  0.077     549      28      1

Goldstone SNRs assume Ptx = 450 kW. 


ARECIBO SNRs

 start date    window        RA, dec   dist   runs   SNR/day   SNR/run
2014 May 18  06:03-08:09    275,  +6  0.066    57      430        61
2014 May 19  05:52-08:39    279, +18  0.057    84      900       100
2014 May 20  06:29-08:33    284, +32  0.052    72     1100       140

Arecibo SNRs assume Ptx = 900 kW and Tsys = 23 K.

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2013 WF108

GOLDSTONE SNRs

Assumptions: D = 0.29 km, P = 2.2 h, OC albedo = 0.1

w  DOY      start date       window       RA, dec   dist    runs      SNR/day   SNR/run
20 137-138  2014 May 17-18  17:40-02:00    86,  -3  0.068     223         18         1
20 138-139  2014 May 18-19  17:30-02:15    87,  +2  0.058     273         35         2
21 139-140  2014 May 19-20  17:15-02:40    89,  +8  0.049     344         71         4
21 140-141  2014 May 20-21  17:00-03:15    92, +16  0.041     446        150         8
21 141-142  2014 May 21-22  16:45-04:05    96, +28  0.034     590        330        15  Scheduled 
21 142-143  2014 May 22-23  16:30-05:40   105, +44  0.030     772        610        24  Scheduled 
21 143-144  2014 May 23-24  16:15-09:35   125, +63  0.029     968        750        26  Scheduled
21 144-145  2014 May 24-25  16:40-14:10   178, +72  0.033    1075        500        17
21 145-146  2014 May 25-26  20:35-14:30   219, +67  0.040     756        220         9  Scheduled
22 146-147  2014 May 26-27  23:10-14:30   233, +60  0.048     561         99         5  Scheduled
22 148      2014 May 28     00:15-14:25   240, +54  0.057     444         48         2
22 149      2014 May 29     00:45-14:20   244, +50  0.067     366         26         1  Scheduled
We also have transmit authorization for 2013 WF108 on May 30-31 just in case the SNRs turn out to be strong enough.

Goldstone SNRs assume Ptx = 450 kW. 


ARECIBO SNRs

 start date    window        RA, dec   dist   runs      SNR/day   SNR/run
2014 May 18  17:52-19:09     87,  +1  0.060     38        160        28
2014 May 19  17:28-19:39     89,  +7  0.051     75        490        60
2014 May 20  17:19-20:01     91, +15  0.042    111       1100       110
2014 May 21  17:32-20:11     96, +26  0.035    129       2200       210

Arecibo SNRs assume Ptx = 650 kW

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Comet 209P/LINEAR

GOLDSTONE SNRs

Assumptions: D = 1.9 km,  P = 21.9 h,  OC albedo = 0.1

w  DOY      start date      window         RA, dec   dist    runs SNR/day  SNR/run
20 132-133  2014 May 12-13  17:51-09:14    137, +61  0.166    164     35       3
20 133-134  2014 May 13-14  17:59-09:08    139, +60  0.158    171     44       4
20 134-135  2014 May 14-15  18:07-09:02    140, +59  0.149    178     55       4
20 135-136  2014 May 15-16  18:15-08:55    141, +58  0.140    186     70       6
20 136-137  2014 May 16-17  18:24-08:48    142, +56  0.131    195     89       7
20 137-138  2014 May 17-18  18:34-08:41    144, +54  0.122    204    120       9
20 138-139  2014 May 18-19  18:45-08:33    145, +52  0.114    214    150      11  Overlaps 2011 JR13 from  0755-0833.  Not enough advance notice to request tx auth
21 139-140  2014 May 19-20  18:56-08:25    146, +50  0.106    225    200      15  
21 140-141  2014 May 20-21  19:08-08:16    148, +47  0.098    237    270      19
21 141-142  2014 May 21-22  19:21-08:07    149, +44  0.090    250    380      26  Overlaps 2011 JR13 and 2013 WF108.  Transmit authorization requested.  
21 142-143  2014 May 22-23  19:36-07:56    151, +39  0.082    263    520      35  Overlaps 2013 WF108.                Transmit authorization requested. 
21 143-144  2014 May 23-24  19:52-07:44    153, +35  0.075    276    720      47  Overlaps 2013 WF108.                Transmit authorization requested.
21 144-145  2014 May 24-25  20:11-07:31    154, +29  0.069    287    990      64
21 145-146  2014 May 25-26  20:31-07:16    156, +22  0.064    293   1300      84  Scheduled   
22 146-147  2014 May 26-27  20:56-06:58    158, +14  0.060    293   1700     110  Scheduled   
22 147-148  2014 May 27-28  21:24-06:36    160,  +5  0.057    281   2000     130  Scheduled   
22 148-149  2014 May 28-29  21:59-06:09    162,  -5  0.055    255   2000     140  Scheduled
22 140-150  2014 May 29-30  22:41-05:35    164, -15  0.056    213   1700     120
22 150-151  2014 May 30-31  23:38-04:48    166, -24  0.058    154   1100      96  Scheduled
22 152      2014 Jun 01     01:11-03:25    169, -33  0.062     63    510      65

After June 1, comet LINEAR will move too far south for Goldstone to track.
Goldstone SNRs assume Ptx = 440 kW


ARECIBO SNRs
                         
 start date    window       RA, dec   dist  runs   SNR/day SNR/run
2014 May 23  21:47-23:17   152, +35  0.076    34     2200    400
2014 May 24  21:24-23:46   154, +30  0.070    60     4700    640
2014 May 25  21:15-23:59   156, +23  0.064    75     7100    850
2014 May 26  21:19-00:01   158, +15  0.060    80     9300   1100
2014 May 27  21:39-23:46   160,  +6  0.057    66     9800   1300

Arecibo SNRs assume Ptx = 900 kW, which is probably optimistic.

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2014 JL25

GOLDSTONE SNRs
JPL/Horizons solution 3
Assumptions: D = 0.29 km, P = 2.1 h, OC albedo = 0.1, Ptx = 440 kW
w  DOY       start date      window         RA, dec   dist   runs   SNR/day   SNR/run
22 146-147   2014 May 26-27  19:15-08:08   153, +46  0.074    307     15         1   Already scheduled for comet LINEAR
22 147-148   2014 May 27-28  19:11-07:51   152, +44  0.067    332     22         1   Already scheduled for comet LINEAR
22 148-149   2014 May 28-29  19:08-07:32   150, +41  0.060    361     34         2   Already scheduled for comet LINEAR
22 149-150   2014 May 29-30  19:06-07:11   148, +38  0.054    394     52         3  
22 150-151   2014 May 30-31  19:04-06:45   146, +34  0.047    431     84         4   Already scheduled for comet LINEAR
22 151-152   2014 May 31-01  19:03-06:16   143, +29  0.041    470    140         7   
22 152-153   2014 Jun 01-02  19:04-05:40   140, +22  0.036    509    240        12
23 153-154   2014 Jun 02-03  19:09-04:55   136, +13  0.031    536    400        18
23 154-155   2014 Jun 03-04  19:19-03:57   132,  +1  0.028    528    580        27
23 155-156   2014 Jun 04-05  19:43-02:38   126, -13  0.026    451    620        32
23 156-157   2014 Jun 05-06  20:39-00:39   120, -28  0.027    259    380        25   Scheduled

ARECIBO SNRs
JPL/Horizons solution 3
Assumptions: Ptx = 400 kW
 start date    window       RA, dec   dist    runs     SNR/day   SNR/run
2014 May 30  20:52-22:28    146, +35  0.048    378        330        38
2014 May 31  20:16-22:35    144, +30  0.042    424        700        68
2014 Jun 01  19:48-22:29    140, +23  0.037    483       1300       110
2014 Jun 02  19:30-22:08    137, +14  0.032    541       2200       170
2014 Jun 03  19:38-21:14    132,  +3  0.028    567       2600       250


Track Assignments


                      UT          UT          PDT                        Round-Trip   SNR/
Target       DOY      Date        TX Window   TX Window                  time (sec)   run
2011 JR13    139      May 19      0755-1430   0055-0730 May 19             56           4    2011 JR13


2011 JR13    140      May 20      1000-1700   0300-1000 May 20             51           6    2011 JR13


2011 JR13    141      May 21      1125-1700   0425-1000 May 21             51           6    2011 JR13


2013 WF108   142      May 22      0015-0405   1715-2105 May 21             34          15    2013 WF108    Date with the smallest uncertainties
Comet LINEAR 142      May 22      0015-0805   1715-0105 May 21             90          26    Comet LINEAR
2011 JR13    142      May 22      0440-1130   2140-0430 May 21-22          56           4    2011 JR13


2013 WF108   143      May 23      0330-0540   2030-2240 May 22             30          24    2013 WF108
Comet LINEAR 143      May 23      0330-0540   2030-2240 May 22             82          35    Comet LINEAR


2013 WF108   143-144  May 23-24   2045-0045   1325-1745 May 23             29          26    2013 WF108
Comet LINEAR 143-144  May 23-24   2045-0045   1325-1745 May 23             75          47    Comet LINEAR


Comet LINEAR 146      May 26      0110-0700   1810-0000 May 25             64          84    Comet LINEAR
2013 WF108   146      May 26      0110-0700   1810-0000 May 25             40           9    2013 WF108


Comet LINEAR 146-147  May 26-27   2050-0530   1350-2230 May 26             60         110    Comet LINEAR
2014 JL25    146-147  May 26-27   2050-0530   1350-2230 May 26             74           1    2014 JL25    Possibly too distant to detect
2013 WF108   146-147  May 26-27   2310-0530   1610-2230 May 26             48           5    2013 WF108


Comet LINEAR 147-148  May 27-28   2120-0030   1420-1730 May 27             57         130    Comet LINEAR
2014 JL25    147-148  May 27-28   2120-0030   1420-1730 May 27             67           1    2014 JL25


Comet LINEAR 149      May 29      0130-0605   1830-2305 May 28             55         140    Comet LINEAR
2014 JL25    149      May 29      0130-0605   1830-2305 May 28             60           2    2014 JL25
2013 WF108   149      May 29      0130-0605   1830-2305 May 28             67           1    2013 WF108   Possibly too distant to detect


Comet LINEAR 150      May 30-31   2350-0445   1650-2145 May 30             58          96    Comet LINEAR
2014 JL25    150      May 30-31   2340-0445   1650-2145 May 30             47           4    2014 JL25
2013 WF108   150      May 30-31   2350-0445   1650-2145 May 30             86           0    2013 WF108   Probably too distant to detect

2014 JL15    156-157  Jun 05-06   2255-0120   1555-1820 Jun 05             27          25    2014 JL25

Start times refer to the beginning of transmit authorization.



ARECIBO TRACKS 

2011 JR13
UT          UT          PDT         Duration Round-trip  
Date        TX Window   TX Window   hh:mm    time (sec)  
May 18      0603-0809   2303-0109    2:06     66
May 19      0552-0839   2252-0139    2:47     57
May 20      0629-0833   2229-0133    2:04     52    CANCELLED


2013 WF108
...Not currently scheduled at Arecibo...detectable on May 18-21...


Comet 209P/LINEAR (2004 CB)
May 23      2147-2317   1447-1617    1:30     76
May 24      2124-2346   1424-1646    2:22     70
May 25      2115-2359   1415-1659    2:44     64
May 26      2119-0001   1419-1701    2:42     60
May 27      2139-2346   1439-1646    2:07     57


2014 JL25
This will probably be observed during a survey track schedued on June 2; no other dates scheduled



Uncertainties

2011 JR13
From Jon Giorgini, 2014 May 19:

New optical was reported for active case 2011 JR13. Folding in 
the 148 reported optical measurements with the delay measurements
from Arecibo and DSS-14, orbit solution #32 was estimated.

Formal 3-sigma X-band uncertainties for s32 at 4 hour intervals
when above 15 degrees elevation at Goldstone:

 Date__(UT)__HR:MN     POS_3sigma   DOP_X_3sig  RT_delay_3sig

>..... Elevation Cut-off Requested .....<

 2014-May-20 08:00  m       1.029         1.58       0.000011
 2014-May-20 12:00 Nm       1.044         1.73       0.000014
 2014-May-20 16:00 *m       1.056         1.87       0.000017

>..... Elevation Cut-off Requested .....<

 2014-May-21 08:00          1.079         2.40       0.000031
 2014-May-21 12:00 Nm       1.077         2.45       0.000035
 2014-May-21 16:00 *m       1.073         2.48       0.000039

>..... Elevation Cut-off Requested .....<

 2014-May-22 04:00 A        1.044         2.62       0.000051
 2014-May-22 08:00          1.031         2.62       0.000056
 2014-May-22 12:00 Nm       1.016         2.57       0.000060
 2014-May-22 16:00 *m       1.000         2.52       0.000064
 2014-May-22 20:00 *m       0.983         2.49       0.000068
 2014-May-23 00:00 *        0.965         2.49       0.000073

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JPL/Horizons solution 24, #obs: 138 (2011-2014)
Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-18 00:00 *   274.28029   3.13536 0.06947990439992      2.532        2.48        9.01       0.000324
 2014-May-19 00:00 *   277.59426  13.69928 0.05981856947098      3.016        3.55       12.89       0.000313
 2014-May-20 00:00 *   282.45046  27.47748 0.05314204467419      3.436        4.61       16.77       0.000335
 2014-May-21 00:00 *   290.12968  43.51618 0.05062744994119      3.561        4.93       17.92       0.000408
 2014-May-22 00:00 *   303.39283  58.74278 0.05286066296907      3.299        4.16       15.11       0.000502
 2014-May-23 00:00 *   327.18138  69.37880 0.05930290857596      2.848        3.02       10.96       0.000579
 2014-May-24 00:00 *     0.79331  73.08674 0.06878228816606      2.418        2.13        7.75       0.000630
 2014-May-25 00:00 *    27.89920  71.52585 0.08023472374050      2.071        1.57        5.72       0.000665
 2014-May-26 00:00 *m   43.35347  68.34389 0.09294263754235      1.804        1.24        4.49       0.000690
 2014-May-27 00:00 *m   52.10434  65.20576 0.10646946873989      1.598        1.03        3.74       0.000711
 2014-May-28 00:00 *m   57.49499  62.48536 0.12055462765177      1.435        0.90        3.27       0.000730
 2014-May-29 00:00 *m   61.08670  60.19268 0.13504073152676      1.304        0.82        2.99       0.000749
 2014-May-30 00:00 *m   63.62961  58.26099 0.14983103283181      1.197        0.77        2.81       0.000767
 2014-May-31 00:00 *m   65.51499  56.61896 0.16486537176817      1.109        0.75        2.72       0.000787

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JPL/Horizons solution 23, # obs: 133 (2011-2013)
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-18 00:00 *   274.27904   3.13498 0.06947994683661     47.699       42.18      153.30       0.001037
 2014-May-19 00:00 *   277.59275  13.69885 0.05981845413741     55.991       59.38      215.80       0.000884
 2014-May-20 00:00 *   282.44860  27.47709 0.05314172069342     62.515       74.11      269.35       0.003220
 2014-May-21 00:00 *   290.12731  43.51604 0.05062689615748     63.203       73.07      265.59       0.005880
 2014-May-22 00:00 *   303.38985  58.74311 0.05285991776864     57.146       53.51      194.47       0.008145
 2014-May-23 00:00 *   327.17844  69.37969 0.05930204321386     48.485       31.24      113.53       0.009608
 2014-May-24 00:00 *     0.79256  73.08787 0.06878135978926     40.721       16.81       61.08       0.010406
 2014-May-25 00:00 *    27.90026  71.52678 0.08023376349317     34.653        9.56       34.74       0.010828
 2014-May-26 00:00 *m   43.35490  68.34457 0.09294165919152     30.004        6.36       23.13       0.011076
 2014-May-27 00:00 *m   52.10569  65.20626 0.10646847728900     26.391        5.14       18.67       0.011253
 2014-May-28 00:00 *m   57.49619  62.48574 0.12055362411101     23.524        4.83       17.55       0.011409
 2014-May-29 00:00 *m   61.08776  60.19299 0.13503971515868     21.202        4.95       17.98       0.011566
 2014-May-30 00:00 *m   63.63055  58.26124 0.14983000216698     19.286        5.26       19.13       0.011734
 2014-May-31 00:00 *m   65.51582  56.61918 0.16486432505693     17.681        5.67       20.61       0.011917


2013 WF108
From Jon Giorgini, 2014 May 28:

Using 75 angular measurements (2013-Nov-7 to 2014-May-27)
and five delay and five Doppler, 2013 WF108 was updated to
orbit solution #34.

Formal 3-sigma X-band uncertainties for s34:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-28 00:00       0.402         0.62       0.000012
 2014-May-29 00:00       0.383         0.61       0.000018
 2014-May-30 00:00       0.371         0.60       0.000024

- - - - - - - - - - 

From Jon Giorgini, 2014 May 24:

The most recent 2013 WF108 s28 orbit is now public in Horizons 
for external use.  Formal 3-sigma X-band uncertainties:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-21 00:00      14.947         3.75       0.000029
 2014-May-22 00:00      18.195         3.25       0.000006
 2014-May-23 00:00      21.119         1.93       0.000010
 2014-May-24 00:00      21.983         1.64       0.000009
 2014-May-25 00:00      20.255         2.84       0.000035
 2014-May-26 00:00      17.438         3.34       0.000075
 2014-May-27 00:00      14.792         3.46       0.000117

- - - - - - - - - - 

From Jon Giorgini, 2014 May 22:

Here are the uncertainties for 2013 WF108 s24, given last night's
radar astrometry. Pointing uncertainty was cut substantially but
is still up there. 

 Date__(UT)__HR:MN  POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-21 00:00      67.267        2.20        8.01       0.000061
 2014-May-22 00:00      81.802        1.10        3.99       0.000006
 2014-May-23 00:00      94.847        2.86       10.38       0.000069
 2014-May-24 00:00      98.607        5.27       19.16       0.000222
 2014-May-25 00:00      90.722        5.93       21.54       0.000431
 2014-May-26 00:00      77.986        5.49       19.96       0.000640
 2014-May-27 00:00      66.054        4.96       18.01       0.000830

- - - - - -

JPL/Horizons Solution 18, # obs: 44 (2013-2014)

 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-20 00:00 *    89.14146   8.16134 0.04860556778960    272.421      109.90      399.42       0.104219
 2014-May-21 00:00 *    92.07127  16.69753 0.04052490895742    354.345      199.43      724.82       0.099047
 2014-May-22 00:00 *    96.79236  28.90244 0.03391997773637    488.099      391.92     1424.41       0.088890  * Scheduled
 2014-May-23 00:00 *   105.52497  45.25878 0.02977365609849    665.038      689.03     2504.24       0.069503  * Scheduled
 2014-May-24 00:00 *   125.21015  62.73050 0.02913958429378    779.530      866.86     3150.55       0.040370  * Scheduled; best day
 2014-May-25 00:00 *   170.53526  72.07453 0.03221316919454    740.166      735.90     2674.59       0.010467
 2014-May-26 00:00 *m  212.80632  68.26744 0.03809795801717    618.380      491.25     1785.41       0.011972  * Scheduled
 2014-May-27 00:00 *m  230.52316  61.35709 0.04571403908927    499.056      300.28     1091.35       0.026086
 2014-May-28 00:00 *m  238.56554  55.60817 0.05433330099562    406.279      179.08      650.87       0.034579
 2014-May-29 00:00 *m  242.98437  51.21564 0.06354545476706    337.777      104.73      380.64       0.039576
 2014-May-30 00:00 *m  245.74731  47.84889 0.07312454817443    287.014       58.32      211.96       0.042412
 2014-May-31 00:00 *m  247.62996  45.21475 0.08294223735023    248.629       28.85      104.84       0.043872


Comet 209P/LINEAR
From Jon Giorgini, 2014 May 30:

209P has been updated to s118. The first two Arecibo 
delays are outliers at 10-20 usec and have been deleted in this fit. 

The most recent Arecibo delay and all Arecibo Dopplers can be 
fit at this time.

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-25 00:00       0.241         0.37       0.000008
 2014-May-26 00:00       0.268         0.41       0.000005
 2014-May-27 00:00       0.294         0.46       0.000005
 2014-May-28 00:00       0.317         0.52       0.000009
 2014-May-29 00:00       0.333         0.55       0.000013
 2014-May-30 00:00       0.339         0.55       0.000018
 2014-May-31 00:00       0.335         0.53       0.000023
 2014-Jun-01 00:00       0.324         0.49       0.000027

- - - - - - - - - - -

From Jon Giorgini, 2014 May 28:

A couple weeks of optical astrometry on 209P has come in and has 
been added to estimate orbit solution #116. Files on aardvark have
been updated.

Formal 3-sigma X-band uncertainties for s116:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-27 00:00       0.284         0.38       0.000007
 2014-May-28 00:00       0.308         0.46       0.000010
 2014-May-29 00:00       0.325         0.53       0.000015
 2014-May-30 00:00       0.333         0.56       0.000019
 2014-May-31 00:00       0.331         0.56       0.000024

The uncertainties for the immediately prior s114 (without the
optical update) were:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-27 00:00       0.925         0.43       0.000007
 2014-May-28 00:00       0.993         0.54       0.000011
 2014-May-29 00:00       1.038         0.64       0.000015
 2014-May-30 00:00       1.053         0.69       0.000021
 2014-May-31 00:00       1.037         0.69       0.000027

Differencing the two predicts on May 30:

     TRANSMITTER: STATION #14,     RECEIVER: STATION #14
     RECEIVER    U.T.       RANGE         DOPPLER     LHA      DEC      RA      EL 
s116: 2014 MAY 30 05:50   56.0467910990  -171000.194  53.9059 -16.3002 164.375  17.341 
s114: 2014 MAY 30 05:50   56.0467753175  -170999.422  53.9054 -16.3001 164.375  17.342
                          -------------  -----------

... so +16 usec, -0.772 Hz, ~2". Looks like some statistically 
significant debiasing in s116. Could be tiny outgassing acceleration 
not currently being modeled but visible in radar.

- - - - - - - - - - 

JPL/Horizons solution 92, # obs: 1061 (2003-2014)

Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-18 00:00 *   143.59322  54.51810 0.12307716672881      1.292        0.72        2.63       0.001233
 2014-May-19 00:00 *   144.94465  52.44244 0.11456596671611      1.366        0.82        2.97       0.001243
 2014-May-20 00:00 *   146.34046  50.02213 0.10622691285908      1.443        0.93        3.38       0.001255
 2014-May-21 00:00 *   147.78514  47.17879 0.09811199751717      1.524        1.06        3.84       0.001269
 2014-May-22 00:00 *   149.28359  43.81450 0.09028940494088      1.609        1.21        4.38       0.001283
 2014-May-23 00:00 *   150.84106  39.80924 0.08284934168401      1.699        1.37        4.99       0.001297
 2014-May-24 00:00 *   152.46315  35.02184 0.07591134549977      1.804        1.57        5.70       0.001309
 2014-May-25 00:00 *   154.15569  29.29989 0.06963221974758      1.940        1.80        6.55       0.001316
 2014-May-26 00:00 *m  155.92477  22.50766 0.06421164847776      2.141        2.12        7.69       0.001312
 2014-May-27 00:00 *m  157.77659  14.58239 0.05988877619187      2.445        2.56        9.31       0.001292
 2014-May-28 00:00 *m  159.71741   5.61702 0.05691918692010      2.862        3.16       11.49       0.001247
 2014-May-29 00:00 *m  161.75334  -4.06830 0.05552464282462      3.336        3.81       13.86       0.001175
 2014-May-30 00:00 *m  163.89024 -13.94256 0.05582674087486      3.752        4.30       15.64       0.001079
 2014-May-31 00:00 *m  166.13347 -23.40886 0.05780159087791      4.009        4.46       16.21       0.000969

2014 JL25
From Jon Giorgini, 2014 May 30:

Another update for 2014 JL25, now with the Goldstone (and WISE) 
astrometry.

Based on 41 optical measurements (May 8-24) and 2 Dopplers, orbit 
solution #11 was computed.

Formal 3-sigma uncertainties for s11 (S/X-band):

 Date__(UT)__HR:MN     POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-30 00:00         25.828        4.32       15.71       0.032986
 2014-May-31 00:00         39.659       13.54       49.23       0.032679
 2014-Jun-01 00:00         61.081       30.21      109.80       0.031917
 2014-Jun-02 00:00         93.961       60.14      218.58       0.030332
 2014-Jun-03 00:00        141.786      110.72      402.40       0.027307
 2014-Jun-04 00:00        201.443      181.79      660.71       0.022048
 2014-Jun-05 00:00        253.412      245.74      893.12       0.014212

- - - - - - - - - -

From Jon Giorgini, 2014 May 27:

Based on 39 angular measurements
(May 4-24), 2014 JL25 orbit solution #6 was estimated.

Formal 3-sigma X-band uncertainties:

 Date__(UT)__HR:MN  POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2014-May-27 00:00       7.267      1991.80       0.210604
 2014-May-28 00:00      11.320      1965.91       0.191132
 2014-May-29 00:00      17.366      1927.80       0.172022
 2014-May-30 00:00      26.499      1871.58       0.153422
 2014-May-31 00:00      40.496      1787.80       0.135541
 2014-Jun-01 00:00      62.153      1661.68       0.118674
 2014-Jun-02 00:00      95.386      1473.57       0.103238
 2014-Jun-03 00:00     143.731      1214.75       0.089841
 2014-Jun-04 00:00     204.030       956.60       0.079469
 2014-Jun-05 00:00     256.495       910.91       0.073841
 2014-Jun-06 00:00     273.369      1088.67       0.074941
 2014-Jun-07 00:00     251.856      1306.27       0.082875
- - - - - 

JPL/Horizons solution 4, #obs: 31 (5 days)

Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2014-May-27 00:00 *m  153.40443  45.84854 0.07455494789848   1124.874     4499.63    16353.69       2.305921  * Scheduled; weak
 2014-May-28 00:00 *m  151.92989  43.87423 0.06761968008876   1498.835     4375.64    15903.05       2.245393  * Scheduled; weak
 2014-May-29 00:00 *m  150.23393  41.43139 0.06079440481870   2023.650     4205.47    15284.59       2.188533  * Scheduled; detectable
 2014-May-30 00:00 *m  148.26941  38.34997 0.05412932780746   2774.943     3990.71    14504.05       2.130542
 2014-May-31 00:00 *m  145.97654  34.38156 0.04770002107258   3870.667     3799.65    13809.64       2.062656  * Scheduled; detectable
 2014-Jun-01 00:00 *m  143.27926  29.16425 0.04162390650016   5488.126     3953.06    14367.21       1.969277
 2014-Jun-02 00:00 *m  140.08099  22.19122 0.03608728064321   7859.469     5258.34    19111.20       1.823609
 2014-Jun-03 00:00 *m  136.26027  12.84425 0.03138347304542  11155.961     8504.20    30908.14       1.584362
 2014-Jun-04 00:00 *m  131.66836   0.66687 0.02794125401652  15070.981    13457.94    48912.26       1.208879
 2014-Jun-05 00:00 *m  126.13327 -13.92857 0.02626416252466  18223.861    17933.53    65178.58       0.737488
 2014-Jun-06 00:00 *m  119.47961 -29.06156 0.02668722503479  18818.760    18758.58    68177.19       0.598007  * Scheduled; highest SNR
 2014-Jun-07 00:00 *m  111.57869 -42.30130 0.02911695369896  16823.362    15936.15    57919.19       1.030075
 2014-Jun-08 00:00 *m  102.43897 -52.36341 0.03311086837214  13820.459    12221.35    44417.93       1.500935
 2014-Jun-09 00:00 *m   92.31338 -59.32269 0.03817655932421  11026.887     9332.03    33916.85       1.882491
 2014-Jun-10 00:00 *m   81.73668 -63.83120 0.04393968126543   8816.738     7489.75    27221.15       2.185612
 2014-Jun-11 00:00 *    71.39893 -66.58667 0.05015481664725   7158.619     6405.12    23279.10       2.435343
 2014-Jun-12 00:00 *    61.90167 -68.16193 0.05666765928215   5925.648     5779.69    21006.02       2.650945
 2014-Jun-13 00:00 *    53.58298 -68.97956 0.06338063999015   5000.597     5414.10    19677.29       2.844993
 2014-Jun-14 00:00 *    46.51275 -69.32958 0.07023053677572   4295.780     5193.16    18874.29       3.025381
 2014-Jun-15 00:00 *    40.59096 -69.40039 0.07717513203543   3749.530     5053.83    18367.90       3.197056

**********************************************************************************************

Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination:

2011 JR13
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta  APmag    S-O-T /r  T-O-M/Illu%
 2014-May-18 00:00     274.26722   3.15666 0.06944967546341  15.58 135.0146 /L   22.1/ 86.8
 2014-May-19 00:00     277.57991  13.72905 0.05979297441914  15.46 126.9340 /L   34.5/ 77.9
 2014-May-20 00:00     282.43544  27.51706 0.05312376609998  15.52 115.1239 /L   48.4/ 67.5
 2014-May-21 00:00     290.11653  43.56278 0.05061912500094  15.86 100.2451 /L   61.1/ 56.3
 2014-May-22 00:00     303.39092  58.78916 0.05286290163081  16.50  84.8749 /L   69.4/ 44.9
 2014-May-23 00:00     327.21680  69.41685 0.05931383346231  17.34  71.7078 /L   71.9/ 33.9
 2014-May-24 00:00       0.87551  73.10919 0.06879925502330  18.22  61.6448 /L   69.4/ 23.8
 2014-May-25 00:00      27.97799  71.53542 0.08025560752783    19.  54.2451 /L   64.0/ 15.1
 2014-May-26 00:00      43.41258  68.34774 0.09296602237558    20.  48.7706 /L   57.4/  8.2
 2014-May-27 00:00      52.14885  65.20747 0.10649445574561    20.  44.6188 /L   50.8/  3.4
 2014-May-28 00:00      57.52999  62.48632 0.12058064180719    21.  41.3746 /L   45.4/  0.7
 2014-May-29 00:00      61.11532  60.19341 0.13506739444523    21.  38.7649 /L   42.1/  0.1
 2014-May-30 00:00      63.65375  58.26169 0.14985808684120    22.  36.6102 /L   41.5/  1.7
 2014-May-31 00:00      65.53584  56.61972 0.16489263523284    22.  34.7910 /L   44.0/  5.1


2013 WF108 
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta  APmag    S-O-T /r  T-O-M/Illu%
 2014-May-20 00:00      89.16800   8.18313 0.04864064290269    21.  33.5295 /T  140.1/ 67.5
 2014-May-21 00:00      92.10258  16.71568 0.04056306757903    21.  32.7655 /T  129.5/ 56.3
 2014-May-22 00:00      96.82914  28.90892 0.03396115998805    20.  35.5499 /T  118.5/ 44.9 *
 2014-May-23 00:00     105.56407  45.24043 0.02981586219300    18.  44.9167 /T  108.0/ 33.9 *
 2014-May-24 00:00     125.21822  62.68301 0.02917821864999  17.05  60.0709 /T  100.6/ 23.8 *
 2014-May-25 00:00     170.38509  72.03751 0.03224435009027  16.31  75.6984 /T   98.3/ 15.1
 2014-May-26 00:00     212.64795  68.27347 0.03812138519357  16.10  87.9893 /T  100.0/  8.2 *
 2014-May-27 00:00     230.42169  61.37820 0.04573132334903  16.16  96.6852 /T  103.6/  3.4 *
 2014-May-28 00:00     238.49508  55.63178 0.05434613615448  16.33 102.7749 /T  107.2/  0.7
 2014-May-29 00:00     242.93106  51.23824 0.06355512302535  16.53 107.1501 /T  110.0/  0.1
 2014-May-30 00:00     245.70455  47.86961 0.07313194961555  16.73 110.4014 /T  111.5/  1.7
 2014-May-31 00:00     247.59425  45.23351 0.08294800072869  16.93 112.8969 /T  111.4/  5.1


Comet 209P/LINEAR 
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta  T-mag  N-mag    S-O-T /r  T-O-M/Illu%
 2014-May-20 00:00     146.32771  50.01771 0.10626590131785  11.36  17.89  74.6412 /T  140.7/ 67.5
 2014-May-21 00:00     147.77189  47.17519 0.09815126380169  11.21  17.71  75.4364 /T  142.1/ 56.3
 2014-May-22 00:00     149.26979  43.81212 0.09032886776512  11.05  17.52  76.4858 /T  140.8/ 44.9
 2014-May-23 00:00     150.82667  39.80862 0.08288885234574  10.88  17.31  77.8605 /T  137.1/ 33.9
 2014-May-24 00:00     152.44810  35.02373 0.07595064960780  10.71  17.09  79.6474 /T  131.6/ 23.8
 2014-May-25 00:00     154.13994  29.30523 0.06967090473560  10.55  16.85  81.9444 /T  124.9/ 15.1
 2014-May-26 00:00     155.90825  22.51758 0.06424908364344  10.40  16.60  84.8426 /T  117.5/  8.2
 2014-May-27 00:00     157.75924  14.59790 0.05992407233054  10.27  16.36  88.3869 /T  109.6/  3.4
 2014-May-28 00:00     159.69915   5.63870 0.05695123204032  10.18  16.14  92.5175 /T  101.5/  0.7
 2014-May-29 00:00     161.73411  -4.04086 0.05555227448330  10.15  15.97  97.0189 /T   93.8/  0.1
 2014-May-30 00:00     163.86996 -13.91090 0.05584903568340  10.19  15.85 101.5392 /T   86.8/  1.7
 2014-May-31 00:00     166.11207 -23.37524 0.05781811712615  10.30  15.81 105.7056 /T   80.9/  5.1

2014 JL25
 Date__(UT)__HR:MN     R.A._(a-appar)_DEC.            delta  APmag    S-O-T /r  T-O-M/Illu%
 2014-May-20 00:00     159.87901  53.20349 0.12348532536861  21.31  81.7030 /T  133.3/ 67.5
 2014-May-21 00:00     159.22459  52.54359 0.11638561303738  21.23  80.8542 /T  135.1/ 56.3
 2014-May-22 00:00     158.49985  51.79499 0.10927806451499  21.15  79.9691 /T  133.4/ 44.9
 2014-May-23 00:00     157.69347  50.93841 0.10217003749395  21.06  79.0402 /T  128.7/ 33.9
 2014-May-24 00:00     156.79194  49.94880 0.09507038630690  20.97  78.0588 /T  121.7/ 23.8
 2014-May-25 00:00     155.77894  48.79305 0.08799006394996  20.87  77.0136 /T  113.1/ 15.1
 2014-May-26 00:00     154.63458  47.42670 0.08094302780140  20.76  75.8905 /T  103.5/  8.2
 2014-May-27 00:00     153.33437  45.78895 0.07394763214593  20.64  74.6720 /T   93.3/  3.4  *  Weak
 2014-May-28 00:00     151.84793  43.79507 0.06702882335253  20.52  73.3365 /T   82.5/  0.7  *  Weak
 2014-May-29 00:00     150.13720  41.32465 0.06022169344926  20.39  71.8582 /T   71.3/  0.1  *  Probably detectable
 2014-May-30 00:00     148.15417  38.20361 0.05357738249092  20.24  70.2098 /T   59.7/  1.7
 2014-May-31 00:00     145.83790  34.17727 0.04717308145368  20.10  68.3710 /T   47.4/  5.1  *  Detectable
 2014-Jun-01 00:00     143.11082  28.87439 0.04112905017476  19.94  66.3562 /T   34.2/ 10.1
 2014-Jun-02 00:00     139.87433  21.77629 0.03563647105170  19.79  64.2864 /T   19.7/ 16.6
 2014-Jun-03 00:00     136.00445  12.25737 0.03099631712771  19.62  62.5489 /T  3.829/ 24.2
 2014-Jun-04 00:00     131.34954  -0.11832 0.02764603406441  19.43  62.0040 /T   15.6/ 32.7
 2014-Jun-05 00:00     125.73495 -14.85921 0.02608994037287  19.19  63.7801 /T   35.8/ 41.9
 2014-Jun-06 00:00     118.98449 -29.98964 0.02664427597623  18.96  68.0981 /T   55.6/ 51.5  *  Strong
 2014-Jun-07 00:00     110.97362 -43.08579 0.02918684684964  18.83  73.6555 /T   72.2/ 61.2  Too far south for Goldstone
 2014-Jun-08 00:00     101.72378 -52.95369 0.03326108281563  18.83  78.9903 /T   84.3/ 70.6
 2014-Jun-09 00:00      91.51009 -59.73465 0.03837759421219  18.93  83.4839 /T   91.8/ 79.5
 2014-Jun-10 00:00      80.89030 -64.10235 0.04417043430494  19.07  87.1143 /T   95.4/ 87.4

Setups


We do not know what to expect as the bandwidth for 2011 JR13, so we'll start with our standard setup.

CW setup:
---------------------------------------------------------------------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           no hopping
Bandwidth:                4000 Hz 
TXoffset                  +500 Hz
Sampling interval:        2500 x 0.1 usec
FFT for PFS files:        4000 for 1 Hz resolution 

Ranging setups:
---------------------------------------------------------------------------
10-usec
baud             10 usec
code            127
PRP            1270 usec
FFT             128   
ncoh              1 
bandwidth       787 Hz   
resolution      6.15 Hz
TXOFF          +100Hz  (echo in bin 81)
---------------------------------------------------------------------------
11-usec 
baud             11 usec
code            127
PRP            1397 usec
FFT             128  
ncoh              1 
bandwidth       716 Hz   
resolution      5.6 Hz
TXOFF          +100 Hz  (echo in bin 82) 
---------------------------------------
1 usec
baud              1.0 usec
code              255
ncoh              4
FFT               128
bandwidth         980   Hz
resolution        7.66 Hz
TXoff            +100 Hz,  echo is in bin 78

Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2011jr13/raw/

2011 JR13 POINTING:

  OSOD and predicts will be on aardvark:

...not available yet...


POINTING  
                                                          TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT    OSOD

... to be added ...

Transmit offsets are given in millidegrees.  


PRDX.OUT.14f-14-14.?? TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL

2011 JR13 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------
Dr. Lance A. M. Benner | PHONE: (818) 354-7412 Mail Stop 183-601 | FAX: (818) 393-4445 Jet Propulsion Laboratory | email: lance.benner@jpl.nasa.gov California Institute of Technology | Plan: To live long and prosper Pasadena, CA 91109-8099 http://echo.jpl.nasa.gov/asteroids/2011JR13/2011JR13_.planning.html

Asteroid Radar Astronomy
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