2000 DP107 planning

Radar observations of (35107) 2000 DP107

J. L. Margot, P. A. Taylor, M. Nolan, E. Howell, S. J. Ostro, L. A. M. Benner, J. D. Giorgini, C. Magri, L. Carter

Observations of 2000 DP107 in 2008 provide an exceptional opportunity to characterize the dynamics, morphology, and physical properties of a binary (or multiple) system. High resolution images obtained over a suitable range of aspect angles will provide detailed information on the regolith, size, shape, and spin of the components and on their mutual orbit and dynamical interactions.

In conjunction with pre-existing observations, these data will probe the formation and evolution of binaries in great detail, including dynamical processes such as tidal interactions and tumbling, radiative processes such as YORP, and erosional processes such as avalanches and lofting/redeposition of material. The signal-to-noise ratio will exceed 200 per run, allowing high quality images to be obtained.


We use Universal Time (UT) everywhere in this document. To obtain local time at Arecibo (AST), subtract 4. To obtain local time at Goldstone (PDT), subtract 7.

Arecibo schedule

UT Date         RTT     DEC    UT rise-set  runs   SNR/run 
-----------------------------------------------------------
2008 SEP 10    57.8      3    10:17-11:52    49    229
2008 SEP 11    57.8      5    09:43-11:41    61    229
2008 SEP 13    59.2     10    08:43-11:08    73    210
2008 SEP 15    62.6     15    07:53-10:31    76    174
2008 SEP 18    70.5     20    06:50-09:33    69    115
2008 SEP 21    81.1     23    06:00-08:40    59     71 
2008 SEP 24    93.6     25    05:18-07:55    50     43 

Goldstone schedule

DOY   UT date   ---  UT window  --- 
253 2008 SEP 09 0900 1030 1545 1615  
254 2008 SEP 10 0830 1000 1550 1620  
256 2008 SEP 12 0810 0940 1500 1530  
257 2008 SEP 13 0735 0905 1315 1345  
258 2008 SEP 14 0750 0920 1450 1520  

Goldstone pointing macros:

   UT               RA       DEC      dRA    dDEC
                    (deg)    (deg)    (mdeg) (mdeg)
2008 SEP 09 10:00   94.210  -0.0994   3.3   1.8
2008 SEP 09 13:00   93.599   0.2328   3.4   1.8
2008 SEP 09 16:00   92.977   0.5661   3.4   1.8

2008 SEP 10 10:00   89.416   2.5805   3.3   1.8
2008 SEP 10 13:00   88.792   2.9186   3.4   1.8
2008 SEP 10 16:00   88.160   3.2558   3.4   1.8

2008 SEP 12 09:00   79.906   7.7968   3.3   1.8
2008 SEP 12 12:00   79.284   8.1221   3.4   1.7
2008 SEP 12 15:00   78.654   8.4429   3.3   1.7

2008 SEP 13 08:00   75.306  10.2136   3.3   1.7
2008 SEP 13 11:00   74.698  10.5224   3.4   1.7
2008 SEP 13 14:00   74.080  10.8256   3.5   1.7

2008 SEP 14 09:00   70.420  12.6686   3.2   1.6
2008 SEP 14 12:00   69.824  12.9521   3.3   1.6
2008 SEP 14 15:00   69.226  13.2279   3.4   1.5

Setup files

Arecibo setup files are in
/share/obs4/usr/radar/2000DP107
Data reduction scripts are stored in :
/proj/radar/2000DP107

Ephemerides are available in:

 
/share/trabuco4/jplephem/osod/ops/a185851
aardvark:/export/data3/osod/ops/a185851
Jon prepared solution 85. If Goldstone observations are successful on September 9, we should get a range measurement, which we'll use to create a solution that should remain valid throughout the campaign.

Expected uncertainties

Relevant 3-sigma uncertainties from Jon Giorgini are listed below:

 
Solution 85
 Date__(UT)__HR:MN   POS_3sigma  DOP_S-sig  DOP_X-sig  RT_delay-sig
 2008-Sep-09 00:00   4.50180357       0.23       0.83      0.001250
 2008-Sep-11 00:00   3.57967510       0.11       0.39      0.001467
 2008-Sep-13 00:00   2.49757193       0.10       0.36      0.001612

Solution 89
 Date__(UT)__HR:MN   POS_3sigma  DOP_S-sig  DOP_X-sig  RT_delay-sig
 2008-Sep-09 00:00   .509023188       0.10       0.37      0.000007
 2008-Sep-11 00:00   .484947352       0.09       0.31      0.000018
 2008-Sep-13 00:00   .435579406       0.07       0.24      0.000037
 2008-Sep-15 00:00   .374295491       0.05       0.17      0.000052
 2008-Sep-17 00:00   .316579045       0.03       0.11      0.000061
 2008-Sep-19 00:00   .271869535       0.02       0.09      0.000065
 2008-Sep-21 00:00   .242056311       0.03       0.10      0.000066

Expected bandwidth

The primary component is 0.8 km in diameter and spins with ~2.7 hours period, so we expect a limb-to-limb bandwidth of ~8 S-band Hz.

The secondary is likely ~300 m in diameter and spins with ~42 hours period (Margot et al., 2002), so the limb-to-limb bandwidth will be 0.2 S-band Hz. Because the round-trip time always exceeds 50 seconds, we should be able to place at least 10 resolution elements on the secondary in the Doppler dimension.

Expected phase coverage

Rotational coverage of the primary will be excellent as it spins with a period of 2.7 hours.

2008 Sep 09 - Goldstone

The primary objective of this track is to obtain unambiguous range measurements for ephemeris update. Another objective is to obtain images at 1 us resolution (or better if supported by SNR and system performance) for measurement of primary-secondary separation.

1. Start with a few CW runs to confirm detection.

2. Obtain ranging runs for unambiguous range detection (10 and 11 usec with 127-length codes).

3. Update ephemeris.

4. Obtain imaging runs (1 us baud, 8191 code, 122 Hz bandwidth, 5 or 10 Hz tx offset)

5. End with a few CW runs.

2008 Sep 10 - Arecibo

This run should use OSOD solution 89 incorporating the 2008 Goldstone astrometry. Objectives for this two-hour long track are as follows:

1. Start with a few CW runs to confirm detection.

2. Switch to high resolution (0.2 us) imaging setup.

3. End with a few CW runs.

2008 Sep 10 - Goldstone

This run should use OSOD solution 89 incorporating the 2008 Goldstone astrometry. Objectives for this track are as follows:

1. Start with ten CW runs to confirm detection.

2. Obtain imaging data at 0.5 us baud (0.5 us baud, 8191 code, 244 Hz bandwidth, 5 or 10 Hz tx offset)

3. End with ten CW runs.

2008 Sep 13 - Goldstone

1. Start with 10 CW runs to confirm detection.

2. Obtain imaging runs (1 us baud, 8191 code, 122 Hz bandwidth, 5 or 10 Hz tx offset)

3. Intersperse boresights if pointing is in question.

4. End with 10 CW runs.

2008 Sep 14 - Goldstone

1. Start with 10 CW runs to confirm detection.

2. Obtain imaging runs (2 us baud, 4095 code, 122 Hz bandwidth, 5 or 10 Hz tx offset)

3. Intersperse boresights if pointing is in question.

4. End with 10 CW runs.

2008 Sep 15 - Arecibo

1. Start with a few CW runs to confirm detection.

2. Switch to high resolution (0.2 us) imaging setup. Sample at 10 MHz with PFS, no matched filters.

3. End with a few CW runs.

2008 Sep 18 - Arecibo

1. Start with a few CW runs to confirm detection.

2. Switch to moderate resolution (0.5 us) imaging setup.

3. End with a few CW runs.

Contact information

                 Name            Institution     Work phone      Cell phone      Email
--------------------------------------------------------------------------------------------------------------
PI               Jean-Luc Margot Cornell         607 255 1810    607 229 5015    jlm@astro.cornell.edu
Rising star      Patrick Taylor  Cornell         607 255 2727                    ptaylor@astro.cornell.edu
 
AO guru/friend   Mike Nolan      NAIC            787 878 2612 x 334              nolan@naic.edu
DSN guru/friend  Lance Benner    JPL             818 354 7412    626 319 4369    lance.benner@jpl.nasa.gov

TX clearance     Reid Drummond   GDSCC           760 255 8218                    rdrummond@jgld.gdscc.nasa.gov
TX clearance     Larry Sturgis   GDSCC           760 255 8071                    LSturgis@jgld.gdscc.nasa.gov

DSN operator     J. Van Brimmer  RARG/ADVDEV     760 255 8469                    JVanbrimmer@gdscc.nasa.gov
DSN operator     M. Silva        RARG/ADVDEV     760 255 8469                    masilva@gdscc.nasa.gov
DSN 		 L. Juare	 RARG/ADVDEV	 760 255 8469                    LJuare@gdscc.nasa.gov

Ephemerides      Jon Giorgini    JPL             818 393 3107                    jdg@tycho.jpl.nasa.gov
GSSR support     Joseph Jao      JPL             818 354 2102    818 640 5802    Joseph.S.Jao@jpl.nasa.gov

How to reach people at Arecibo and Goldstone

Patrick VSQ                     787 878 2612 x 379


JPL radar central               818 354 2877
Goldstone Pedestal              760 255 8470,8469,8259

Return to my home page.

jlm@astro.cornell.edu