2010 AL30 Goldstone Radar Observations Planning


Background


2010 AL30 was discovered on Jan 10, 2010 by Lincoln Laboratory ETS in New Mexico.   
2010 AL30 is a small object (11-25 m), but it will be an excellent radar target
when it approaches within 0.3 lunar distances (LD) on Jan 13. 

Our track at Goldstone is scheduled from 02:20 UT to 04:40 UT, during which time the object goes from ~1 LD to 0.8 LD.

Date__(UT)__HR:MN      R.A._(J2000.0)_DEC.         delta(LD)    RTT(sec)
 2010-Jan-13 02:00     102.56948  11.99381              1.04        2.7
 2010-Jan-13 02:30     101.69986  12.13745              1.00        2.6
 2010-Jan-13 03:00     100.75123  12.29088              0.96        2.4
 2010-Jan-13 03:30      99.71286  12.45488              0.91        2.3
 2010-Jan-13 04:00      98.57210  12.63027              0.87        2.2
 2010-Jan-13 04:30      97.31399  12.81780              0.83        2.1

Due to a short RTT, we will be using bistatic setup with DSS-14 transmitting and DSS-13 receiving.

2010 AL30 is optically observable until Jan 13 after which it goes too close to the Sun.

-------------------------------------------------------------------------------------------
Orbital and Physical Characteristics  
 orbit type               Apollo
 semimajor axis           1.001 AU     
 eccentricity             0.31
 inclination              3.9       
 perihelion distance      0.695 AU     
 aphelion distance        1.307 AU     
 absolute magnitude (H)   26.9
 diameter                 11-25 m
 rotation period          9 min (William Ryan, private comm.)
 pole direction           unknown  
 lightcurve amplitude     0.2-0.3 (William Ryan, private comm.)
 spectral class           unknown

Last update: 2010 Jan 12

First MPEC

  M.P.E.C. 2010-A59                                Issued 2010 Jan. 11, 15:43 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
   on behalf of Commission 20 of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC@CFA.HARVARD.EDU
          URL http://www.cfa.harvard.edu/iau/mpc.html  ISSN 1523-6714

                                   2010 AL30

Observations:
     K10A30L* C2010 01 10.27372 07 56 21.69 +08 43 54.1          18.8   EA059704
     K10A30L  C2010 01 10.28653 07 56 17.04 +08 44 03.1          19.1   EA059704
     K10A30L  C2010 01 10.29935 07 56 12.26 +08 44 10.5          19.9   EA059704
     K10A30L  C2010 01 10.31215 07 56 07.52 +08 44 18.6          19.9   EA059704
     K10A30L  C2010 01 10.32497 07 56 02.62 +08 44 25.9          19.0   EA059704
     K10A30L  C2010 01 11.29321 07 51 24.76 +08 58 24.2          18.3 V EA059G96
     K10A30L  C2010 01 11.29368 07 51 24.44 +08 58 25.0          18.1 V EA059G96
     K10A30L  C2010 01 11.29412 07 51 24.15 +08 58 25.5          18.3 V EA059G96
     K10A30L  C2010 01 11.29455 07 51 23.86 +08 58 25.9          18.4 V EA059G96
     K10A30L  C2010 01 11.29498 07 51 23.58 +08 58 26.6          18.4 V EA059G96
     K10A30L  C2010 01 11.58340 07 48 59.75 +09 19 43.0          17.9 R EA059E16
     K10A30L  C2010 01 11.58801 07 48 55.85 +09 19 53.2          17.9 R EA059E16
     K10A30L  C2010 01 11.59153 07 48 52.86 +09 20 01.3          17.8 R EA059E16
     K10A30L  C2010 01 11.59622 07 48 48.85 +09 20 10.9          17.8 R EA059E16
     K10A30L  C2010 01 11.59769 07 48 47.58 +09 20 14.2          17.7 R EA059E16
     K10A30L  C2010 01 11.59891 07 48 46.52 +09 20 16.9          17.5 R EA059E16

Observer details:
704 Lincoln Laboratory ETS, New Mexico.  Observers M. Blythe, G. Spitz,
    R. Brungard, J. Paige, P. Festler.  1.0-m f/2.15 reflector + CCD.
E16 Grove Creek Observatory, Trunkey.  Observers P. Camilleri, E. Guido,
    M. Jaeger, E. Prosperi, G. Sostero, W. Vollmann.  Measurer G. Sostero.
    0.35-m f/7 reflector + CCD.
G96 Mt. Lemmon Survey.  Observer A. Boattini.  Measurers J. D. Ahern,
    E. C. Beshore, A. Boattini, G. J. Garradd, A. R. Gibbs, A. D. Grauer,
    R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught.  1.5-m reflector
    + CCD.

Orbital elements:
2010 AL30                                                Earth MOID = 0.0000 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5                  MPC
M 281.40401              (2000.0)            P               Q
n   0.98349499     Peri.  104.60232     -0.78960713     +0.61038481
a   1.0014316      Node   113.05422     -0.58599752     -0.71971978
e   0.3055892      Incl.    3.91707     -0.18200958     -0.33080782
P   1.00           H   27.0           G   0.15           U   7
Residuals in seconds of arc
100110 704  0.2+  0.1-    100111 G96  0.0   0.1+    100111 E16  0.2+  0.3+
100110 704  0.3+  0.4+    100111 G96  0.1+  0.0     100111 E16  0.2+  0.1-
100110 704  0.3-  0.3-    100111 G96  0.1+  0.2-    100111 E16  0.0   0.1+
100110 704  0.5+  0.0     100111 G96  0.2+  0.1-    100111 E16  0.2-  0.2+
100110 704  0.2-  0.2-    100111 E16  0.2+  0.5-
100111 G96  0.1+  0.0     100111 E16  0.2+  0.2-

Ephemeris:
2010 AL30                a,e,i = 1.00, 0.31, 4                   q = 0.6954
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2010 01 04    08 02.83   +08 33.1    0.0536   1.033   158.9    20.0    21.7
2010 01 06    08 02.11   +08 32.3    0.0422   1.023   160.7    18.5    21.1
2010 01 08    08 00.60   +08 34.8    0.0310   1.013   162.5    16.9    20.4
2010 01 10    07 57.06   +08 44.7    0.0198   1.003   164.6    15.1    19.3
2010 01 12    07 43.96   +09 26.4    0.00863  0.992   167.4    12.4    17.4

2010 01 12.5  07 32.83   +10 01.0    0.00586  0.989   168.4    11.6    16.5
2010 01 13.0  07 01.77   +11 29.9    0.00312  0.987   166.8    13.1    15.2
2010 01 13.5  02 43.97   +14 16.7    0.00088  0.984   109.9    70.0    14.2
2010 01 14.0  21 09.83   -04 15.7    0.00275  0.981    27.4   152.5
2010 01 14.5  20 29.22   -06 50.6    0.00548  0.978    18.1   161.8
2010 01 15.0  20 17.11   -07 34.4    0.00826  0.976    15.6   164.3
2010 01 15.5  20 10.98   -07 56.1    0.0110   0.973    14.3   165.6

2010 01 16    20 07.30   -08 09.1    0.0138   0.970    13.5   166.3
2010 01 18    20 00.78   -08 32.8    0.0250   0.959    12.1   167.6
2010 01 20    19 58.27   -08 43.6    0.0362   0.949    11.7   167.9
2010 01 22    19 56.95   -08 51.3    0.0475   0.938    11.8   167.6
2010 01 24    19 56.17   -08 58.3    0.0589   0.927    12.4   166.8

Sonia Keys                   (C) Copyright 2010 MPC           M.P.E.C. 2010-A59


SNR Calculation

Target Name:    2010 AL30
HMag:           27
Diameter:       0.013 km  (plus/minus a factor of two)
Period:         0.2 h    (a conservative lower bound)   

                                              #           max
 Start date  UT  window    RA, dec  dist    runs   SNR  SNR/run
----------------------------------------------------------------
2010 Jan 11  03:32-13:01   118,   9  0.012    700     35      1
2010 Jan 12  03:17-12:41   115,  10  0.007    700    280     11
2010 Jan 13  02:16-09:48    91,  13  0.002    700  35000   1400
2010 Jan 13  18:13-01:15   321,  -4  0.002    700  14000    560
2010 Jan 14  16:41-00:22   305,  -8  0.007    700    190      8

Goldstone SNRs assume Ptx = 430 kW 

Track Assignments


Goldstone track:

        UT          UT          PST                     Duration  Round-trip
DOY     Date        TX Window   TX Window               hh:mm     time (sec)  SNR/Run 
---     ----        ---------   ---------               --------- -------     -------
13      Jan 13      0220 0440   1820-2040    Jan 12     02:20       2.5        1400  


Uncertainties

From Jon Giorgini, Jan-12-2010:

h 176 optical measurements (2010-Jan-10 06:35 to
2010-Jan-12 22:35), 2010 AL30 solution #14 was computed.
Formal 3-sigma X-band uncertainties are below.

 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2010-Jan-13 02:00        3.131       133.39       0.000786
 2010-Jan-13 03:00        4.163       131.60       0.000738
 2010-Jan-13 04:00        5.683       129.21       0.000691
 2010-Jan-13 05:00        7.937       125.98       0.000646

From Jon Giorgini, Jan-12-2010:
With 152 optical measurements (2010-Jan-10.3 to 2010-Jan-12.7),
2010 AL30 solution #10 was computed. Formal 3-sigma X-band
uncertainties are below.

 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2010-Jan-13 02:00       11.014       230.23       0.001013
 2010-Jan-13 03:00       14.315       227.51       0.000957
 2010-Jan-13 04:00       18.879       223.86       0.000908
 2010-Jan-13 05:00       25.302       218.88       0.000864


JPL/Horizons solution #8: 115 measurements (2010-Jan-10 to 2010-Jan-12)

Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2010-Jan-13 00:00       8.234       249.30       0.001264
 2010-Jan-13 01:00      10.515       247.62       0.001204
 2010-Jan-13 02:00      13.558       245.46       0.001149
 2010-Jan-13 03:00      17.696       242.62       0.001102
 2010-Jan-13 04:00      23.427       238.82       0.001060
 2010-Jan-13 05:00      31.492       233.61       0.001024

From Jon Giorgini, 2010 Jan 11: 
With 16 measurements (2010-Jan-10 to 2010-Jan-11), 2010 AL30 solution #1
has formal 3-sigma X-band uncertainties as follows for the GSSR window:

 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2010-Jan-13 02:00      523.120      2514.66       0.022463
 2010-Jan-13 03:00      653.159      2494.92       0.022887
 2010-Jan-13 04:00      828.916      2468.07       0.023241
 2010-Jan-13 05:00     1070.036      2430.87       0.023475
 2010-Jan-13 06:00     1405.252      2378.37       0.023506
 2010-Jan-13 07:00     1875.726      2302.85       0.023209
 2010-Jan-13 08:00     2536.602      2192.33       0.022384
 2010-Jan-13 09:00     3448.473      2028.59       0.020723
 2010-Jan-13 10:00     4636.796      1786.26       0.017792

Optical observations:
 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.  APmag            delta    S-O-T /r
 2010-Jan-11 00:00     118.27631   8.95303  18.47 0.01419572070134   165.8031 /L
 2010-Jan-12 00:00     115.98821   9.43994  17.32 0.00863029779804   167.4414 /L
 2010-Jan-13 00:00     105.42251  11.50283  15.13 0.00312014504303   166.8202 /T
 2010-Jan-14 00:00     316.48796  -4.51550   n.a. 0.00276555895123    26.5012 /T

NOTE: the object gets too close to the Sun after Jan 13 

Setups



CW setup:
---------------------------------------------------------------------------
TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           2                          
Dwell                     10 seconds                      
Bandwidth:                8000 Hz   <-- NOTE THE BANDWIDTH!
Sampling interval:        1250 x 0.1 usec
VME FFT for PSD files:    8192 for 1-Hz resolution 

After the first orbital update, we will change CW setup to:

TX polarization           RCP
RCV polarization          LCP & RCP
Frequency hops:           2                          
Dwell                     10 seconds                      
Bandwidth:                4000 Hz <-- NOTE THE BANDWIDTH!
Sampling interval:        2500 x 0.1 usec
VME FFT for PSD files:    4096 for 1-Hz resolution 



Chirp Test:
-------------
Joseph and Clement recommended 20 MHz chirp with 20 usec PRP which will 
PFS sample at 20 MHz (0.05 usec baud) and 
Digital RCV at 80 MHz (0.0125 usec baud).



Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2010AL30/raw/

2010 AL30 POINTING:

  OSOD and predicts are on aardvark:

/export/data3/osod/ops/2010al30/PRDX.s14 
                              /PUNCH.OUT.s14
                              /EPH.OUT.s14


POINTING  
                                                          TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT    OSOD
2010 01 13   013  020000    103.4307 11.5004        A                    2.7
2010 01 13   013  030000    101.5861 11.8039        A     -92.7   -2.7   2.4    s14
2010 01 13   013  040000     99.2992 12.1476        A                    2.2

2010 01 13   013  040000     99.2992 12.1476        B                    2.2
2010 01 13   013  050000     96.4412 12.5319        B     -93.9   -3.4   2.0    s14
2010 01 13   013  060000     92.8389 12.9521        B                    1.8

Transmit offsets are given in millidegrees.  


PRDX.OUT.s14 TRANSMITTER: STATION #14, RECEIVER: STATION #13 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2010 JAN 13 02:20 2.5745927493 546204.969 287.8123 11.6000 102.859 21.147 2010 JAN 13 02:30 2.5363492560 544993.600 290.6207 11.6501 102.558 23.467 2010 JAN 13 02:40 2.4981940043 543686.790 293.4398 11.7013 102.245 25.795 2010 JAN 13 02:50 2.4601337709 542282.016 296.2703 11.7535 101.922 28.128 2010 JAN 13 03:00 2.4221755121 540776.660 299.1124 11.8069 101.586 30.465 2010 JAN 13 03:10 2.3843263730 539167.988 301.9668 11.8614 101.239 32.803 2010 JAN 13 03:20 2.3465936939 537453.145 304.8339 11.9170 100.879 35.141 2010 JAN 13 03:30 2.3089850236 535629.129 307.7143 11.9738 100.505 37.477 2010 JAN 13 03:40 2.2715081233 533692.776 310.6086 12.0317 100.118 39.805 2010 JAN 13 03:50 2.2341709816 531640.743 313.5173 12.0908 99.716 42.125 2010 JAN 13 04:00 2.1969818290 529469.480 316.4412 12.1510 99.299 44.429 2010 JAN 13 04:10 2.1599491588 527175.210 319.3808 12.2123 98.866 46.714 2010 JAN 13 04:20 2.1230817313 524753.903 322.3369 12.2748 98.417 48.973 2010 JAN 13 04:30 2.0863885985 522201.247 325.3102 12.3383 97.950 51.198 2010 JAN 13 04:40 2.0498791275 519512.617 328.3014 12.4030 97.466 53.377

2010 AL30 GOLDSTONE MASTERLOG

============================================================================== Receive TX Setup hops dwell code ncoh FFT runs start -stop OSOD offset Poln Notes ------------------------------------------------------------------------------ POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
Dr. Lance A. M. Benner | PHONE: (818) 354-7412 Mail Stop 300-233 | FAX: (818) 354-9476 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/2010AL30/2010AL30_planning.html

Asteroid Radar Astronomy