2010 AF40 Goldstone Radar Observations Planning


Background


2010 AF40 was discovered on Jan 12, 2010 by Mt. Lemmon Survey.   
2010 AF40 is a small object (26-59 m), but it will be an excellent radar target
when it approaches within 2.3 LD on Jan 21. 

We will start tracking it at Goldstone shortly before its closest approach.
Our track is scheduled for Jan 21, from 00:50 UT to 02:40 UT.
 
Date__(UT)__HR:MN      R.A._(J2000.0)_DEC.         delta(LD)    RTT(sec)
2010-Jan-21 00:30      55.76316  32.34769          2.6          6.6
2010-Jan-21 01:00      54.13880  32.40435          2.5          6.5
2010-Jan-21 01:30      52.47859  32.44069          2.5          6.4
2010-Jan-21 02:00      50.78420  32.45530          2.5          6.4
2010-Jan-21 02:30      49.05761  32.44685          2.5          6.3
2010-Jan-21 03:00      47.30112  32.41407          2.4          6.3


Due to a short RTT, we will be using bistatic setup with DSS-14 transmitting and DSS-13 receiving.
2010 AF40 is optically observable until Jan 22 after which it goes too close to the Sun.

Orbital and Physical Characteristics  
 orbit type               Apollo
 semimajor axis           1.235 AU     
 eccentricity             0.47
 inclination              4.4       
 perihelion distance      0.660 AU     
 aphelion distance        1.810 AU     
 absolute magnitude (H)   25.0
 diameter                 26-59 m
 rotation period          0.357 h (Joe Pollock and Peter Kusnirak, pers. comm.)
 pole direction           unknown  
 lightcurve amplitude    ~1 mag
 spectral class           unknown

Last update: 2010 Jan 20

First MPEC

  M.P.E.C. 2010-A68                                Issued 2010 Jan. 13, 15:02 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 AF40

Observations:
     K10A40F* C2010 01 12.35742 07 57 11.41 +13 03 28.0          20.5 V EA068G96
     K10A40F  C2010 01 12.36453 07 57 10.36 +13 03 33.7          20.3 V EA068G96
     K10A40F  C2010 01 12.37176 07 57 09.32 +13 03 39.6          20.3 V EA068G96
     K10A40F  C2010 01 12.37897 07 57 08.20 +13 03 45.5          20.1 V EA068G96
     K10A40F  C2010 01 12.40453 07 57 04.12 +13 04 02.1          19.4 R EA068H01
     K10A40F  C2010 01 12.41284 07 57 02.91 +13 04 08.5          19.5 R EA068H01
     K10A40F  C2010 01 12.42015 07 57 01.87 +13 04 14.2          19.4 R EA068H01
     K10A40F  C2010 01 12.43981 07 56 59.07 +13 04 29.1          19.4 R EA068H01
     K10A40F  C2010 01 12.48383 07 56 53.20 +13 05 07.2                 EA068291
     K10A40F  C2010 01 12.48761 07 56 52.69 +13 05 10.2                 EA068291
     K10A40F  C2010 01 12.49138 07 56 52.17 +13 05 13.0                 EA068291
     K10A40F  C2010 01 13.26122 07 55 27.00 +13 17 36.8          19.3 R EA068H01
     K10A40F  C2010 01 13.26824 07 55 25.75 +13 17 44.6          19.3 R EA068H01
     K10A40F IC2010 01 13.27535907 55 22.06 +13 17 41.2                 EA068H21
     K10A40F  C2010 01 13.27582 07 55 24.40 +13 17 52.9          19.4 R EA068H01
     K10A40F IC2010 01 13.27999207 55 21.22 +13 17 46.3          19.8 V EA068H21
     K10A40F  C2010 01 13.28292 07 55 23.12 +13 18 00.8          19.5 R EA068H01
     K10A40F  C2010 01 13.32619 07 55 15.73 +13 18 50.6          19.6 R EA068854
     K10A40F  C2010 01 13.32907 07 55 15.34 +13 18 54.4          19.6 R EA068854
     K10A40F  C2010 01 13.34346 07 55 12.43 +13 19 11.6          19.6 R EA068854

Observer details:
291 LPL/Spacewatch II.  Observer R. S. McMillan.  1.8-m f/2.7 reflector + CCD.
854 Sabino Canyon Observatory, Tucson.  Observer J. E. McGaha.  0.36-m f/10.0
    Schmidt-Cassegrain + CCD.
G96 Mt. Lemmon Survey.  Observer A. D. Grauer.  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.
H01 Magdalena Ridge Observatory, Socorro.  Observer W. H. Ryan.  2.4-m f/8.9
    reflector + CCD.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurer S. Foglia.

Orbital elements:
2010 AF40                                                Earth MOID = 0.0019 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5                  MPC
M 306.78932              (2000.0)            P               Q
n   0.72339923     Peri.   93.47933     -0.83763793     +0.54226603
a   1.2289966      Node   119.36895     -0.52629209     -0.76904469
e   0.4606513      Incl.    4.32045     -0.14621677     -0.33840481
P   1.36           H   25.0           G   0.15           U   9
Residuals in seconds of arc
100112 G96  0.4-  0.0     100112 H01  0.1-  0.1+    100113 H01  0.2-  0.0
100112 G96  0.2-  0.0     100112 291  0.1-  0.1+    100113 H21  0.1-  0.1-
100112 G96  0.4+  0.1+    100112 291  0.0   0.2+    100113 H01  0.3-  0.1+
100112 G96  0.3-  0.2+    100112 291  0.2-  0.2+    100113 854  0.0   0.6-
100112 H01  0.0   0.2+    100113 H01  0.4-  0.1+    100113 854  2.0+  0.1+
100112 H01  0.1-  0.2+    100113 H01  0.4-  0.1+    100113 854  1.7-  1.9+
100112 H01  0.1+  0.2+    100113 H21  0.1+  0.3-

Ephemeris:
2010 AF40                a,e,i = 1.23, 0.46, 4                   q = 0.6629
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2010 01 14    07 53.60   +13 32.9    0.0609   1.044   171.7     7.8    19.6
2010 01 15    07 50.45   +13 58.2    0.0527   1.036   172.7     6.9    19.2
2010 01 16    07 46.13   +14 32.9    0.0445   1.028   173.5     6.3    18.8
2010 01 17    07 39.83   +15 23.1    0.0364   1.020   173.5     6.2    18.3
2010 01 18    07 29.86   +16 40.9    0.0284   1.012   172.1     7.7    17.8
2010 01 19    07 11.82   +18 55.1    0.0205   1.004   167.8    11.9    17.3
2010 01 20    06 30.25   +23 26.8    0.0129   0.996   157.3    22.5    16.6
2010 01 21    04 01.77   +32 04.7    0.00682  0.988   123.4    56.3    16.2
2010 01 22    23 07.80   +15 48.4    0.00773  0.980    55.2   124.4    19.6
2010 01 23    21 36.75   +02 19.4    0.0143   0.972    28.9   150.7    24.3
2010 01 24    21 06.63   -02 28.0    0.0220   0.964    19.8   159.8    27.5

Sonia Keys                   (C) Copyright 2010 MPC           M.P.E.C. 2010-A68


SNR Calculation

Target Name:    2010 AF40
HMag:           25
Diameter:       0.032 km  (plus/minus a factor of two)
Period:         0.2 h    (a conservative lower bound)   

NOTE: Bistatic SNRs
                                                     #           max
 Start date        UT window      RA, dec   dist    runs   SNR  SNR/run
-----------------------------------------------------------------
2010 Jan 20        00:51-11:07    92,  26  0.011    700     50     2 
2010 Jan 20/21     22:13-07:32    48,  32  0.006    700    350    14
2010 Jan 21/22     18:14-03:17   347,  16  0.008    700    170     7 

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 
---     ----        ---------   ---------               --------- -------     -------
021     Jan 21      0050-0240   1650-1840    Jan 21     01:50       6.4        14  


Uncertainties

From Jon Giorgini, Jan-20-2010, s#9, 63 optical measurements (2010-Jan-12 to 2010-jan-19),
 Date__(UT)__HR:MN   POS_3sigma   DOP_X_3sig  RT_delay_3sig
 2010-Jan-21 00:00       16.554      1718.56       0.032271
 2010-Jan-21 00:20       16.992      1662.31       0.032034
 2010-Jan-21 00:40       17.445      1604.65       0.031804
 2010-Jan-21 01:00       17.915      1545.58       0.031582
 2010-Jan-21 01:20       18.402      1485.14       0.031369
 2010-Jan-21 01:40       18.909      1423.35       0.031163
 2010-Jan-21 02:00       19.435      1360.24       0.030967
 2010-Jan-21 02:20       19.981      1295.85       0.030778
 2010-Jan-21 02:40       20.546      1230.23       0.030599

JPL/Horizons solution #7: # obs: 63 (7 days)
 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2010-Jan-20 00:00 *m   97.18294  23.54809 0.01263172202553      2.931      965.95     3454.91       0.061176
 2010-Jan-21 00:00 *m   57.74077  32.17836 0.00661930641587     16.515      480.31     1717.93       0.032258
 2010-Jan-22 00:00 *m  344.74542  14.54771 0.00794043322758     26.813      735.21     2629.60       0.038716
 2010-Jan-23 00:00 *m  323.39489   1.77557 0.01473794353635     18.422     1008.19     3605.97       0.071553

JPL/Horizons solution #6: # obs: 47 (6 days)
 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.            delta POS_3sigma  DOP_S_3sig  DOP_X_3sig  RT_delay_3sig
 2010-Jan-20 00:00 *m   97.18278  23.54806 0.01264407291414     39.845     1863.11     6663.77       0.112934
 2010-Jan-21 00:00 *m   57.73976  32.17822 0.00662576352822    241.287      929.76     3325.45       0.058666
 2010-Jan-22 00:00 *m  344.74511  14.54730 0.00794836670114    242.525     1412.79     5053.11       0.076723
 2010-Jan-23 00:00 *m  323.39516   1.77559 0.01475265166976     92.605     1940.57     6940.81       0.141922

JPL/Horizons solution #4: 40 measurements (2010-Jan-12 to 2010-Jan-16)
 Date__(UT)__HR:MN      POS_3sigma    DOP_X_3sig  RT_delay_3sig
 2010-Jan-21 00:00        2935.868       4832.20       0.068729
 2010-Jan-21 01:00        3108.311       4358.94       0.066660
 2010-Jan-21 02:00        3276.763       3851.60       0.064823
 2010-Jan-21 03:00        3437.074       3312.65       0.063334
 2010-Jan-21 04:00        3584.937       2746.04       0.062328

Optical observations:
 Date__(UT)__HR:MN     R.A._(J2000.0)_DEC.  APmag            delta    S-O-T /r
 2010-Jan-16 00:00     116.52250  14.55289  18.81 0.04461060974815  173.4546 /T
 2010-Jan-17 00:00     114.93533  15.39586  18.35 0.03641059277993  173.5284 /T
 2010-Jan-18 00:00     112.41026  16.70841  17.85 0.02828585302582  172.0584 /T
 2010-Jan-19 00:00     107.79910  18.99011  17.29 0.02029529036767  167.7129 /T
 2010-Jan-20 00:00      96.99451  23.66307  16.61 0.01265644708987  156.7408 /T
 2010-Jan-21 00:00      57.35031  32.27212  16.22 0.00665746311617  120.7734 /T
 2010-Jan-22 00:00     344.76002  14.62271   n.a. 0.00800337284678   52.8616 /T


Setups



CW setup:
---------------------------------------------------------------------------
TX polarization              RCP
RCV polarization             LCP and RCP
Frequency hops:              2                          
Dwell                        10 seconds                      
Bandwidth:                   16000 Hz   <-- please note the bandwidth
Sampling interval:           625 x 0.1 usec
VME FFT for PSD files:       16384 for 0.98-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:
0.2 usec is max resolution in delay


Instructions

NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2010AF40/raw/

2010 AF40 POINTING:

  OSOD and predicts are on aardvark:

/export/data3/osod/ops/2010af40/PRDX.OUT.14-13-13.s9
                              /PUNCH.OUT.14-13-13.s9
                              /EPH.OUT.s9


POINTING  
                                                          TX Offsets    
Date (UTC)   DOY  hhmmss    RA        Dec         Macro   LHA     Dec    RTT    OSOD
2010 01 21   021  000000    57.9086  32.2115        A                    6.6  
2010 01 21   021  010000    54.6277  32.3848        A     6.10    0.30   6.5    s9 
2010 01 21   021  020000    51.1759  32.4651        A                    6.4

2010 01 21   021  020000    51.1759  32.4651        B                    6.4
2010 01 21   021  030000    47.5776  32.4371        B     6.30   -0.10   6.3    s9
2010 01 21   021  040000    43.8657  32.2890        B                    6.3

Transmit offsets are given in millidegrees.  


PRDX.OUT.14-13-13.s9 TRANSMITTER: STATION #14, RECEIVER: STATION #13 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2010 JAN 21 00:50 6.4800551851 342326.600 320.8090 32.3632 55.186 57.517 2010 JAN 21 01:00 6.4563017027 335422.031 323.8751 32.3861 54.627 60.015 2010 JAN 21 01:10 6.4330358126 328414.403 326.9460 32.4064 54.063 62.521 2010 JAN 21 01:20 6.4102646372 321306.525 330.0216 32.4240 53.494 65.034 2010 JAN 21 01:30 6.3879951140 314101.389 333.1018 32.4389 52.921 67.553 2010 JAN 21 01:40 6.3662339291 306802.163 336.1864 32.4509 52.343 70.075 2010 JAN 21 01:50 6.3449875777 299412.188 339.2753 32.4601 51.761 72.598 2010 JAN 21 02:00 6.3242622981 291934.971 342.3684 32.4663 51.175 75.117 2010 JAN 21 02:10 6.3040640688 284374.176 345.4657 32.4696 50.584 77.627 2010 JAN 21 02:20 6.2843986232 276733.616 348.5669 32.4697 49.990 80.115 2010 JAN 21 02:30 6.2652714103 269017.250 351.6718 32.4667 49.392 82.549 2010 JAN 21 02:40 6.2466875991 261229.166 354.7805 32.4605 48.790 84.848

2010 AF40 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/2010AF40/2010AF40_planning.html

Asteroid Radar Astronomy