2006 AS2 Goldstone Radar Observations Planning
2006 AS2 was discovered by the Mt. Lemmon Survey (Arizona) on January 5, 2006. It will approach within 0.0235 AU (9.2 lunar distances) on February 10, 2009. 2006 AS2 has an absolute magnitude of 20.3, that, combined with its C-class taxonomy (M. D. Hicks et al., pers. comm.) suggests a diameter within a factor of two of 520 meters. Brian Warner and Al Harris report a rotation period of 4.5 hours. We are expecting this asteroid to be a strong target and we hope to image it with 1/8 usec resolution. Goldstone observations are scheduled on February 7 and 8. Arecibo observations are scheduled on February 11-16. This object will brighten to about 15th magnitude in early February when it will be a good target for photometric and spectroscopic observations. 2006 AS2 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Apollo semimajor axis 2.093 AU eccentricity 0.636 inclination 2.6° perihelion distance 0.762 AU aphelion distance 3.424 AU absolute magnitude (H) 20.3 diameter 520 meters +- a factor of two rotation period 4.5 h (B. D. Warner and A. W. Harris, pers. comm.) pole direction unknown lightcurve amplitude 0.2 mag (B. D. Warner and A. W. Harris, pers. comm.) spectral class C (M. D. Hicks, K. Lawrence, and B. Buratti, pers. comm.) Last update: 2009 February 5
M.P.E.C. 2006-A23 Issued 2006 Jan. 6, 20:07 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. Supported in part by the Brinson Foundation Supported in part by the TABASGO Foundation Prepared using the Tamkin Foundation Computer Network MPC@CFA.HARVARD.EDU URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714 2006 AS2 Observations: K06A02S* C2006 01 05.41164 10 23 57.62 +08 20 52.9 19.7 V EA023G96 K06A02S C2006 01 05.41895 10 23 59.60 +08 20 43.5 19.6 V EA023G96 K06A02S C2006 01 05.42625 10 24 01.58 +08 20 33.8 19.7 V EA023G96 K06A02S C2006 01 05.43361 10 24 03.56 +08 20 24.2 19.6 V EA023G96 K06A02S C2006 01 05.47599 10 24 15.08 +08 19 28.0 19.9 V EA023G96 K06A02S C2006 01 05.48596 10 24 17.74 +08 19 15.2 19.7 V EA023G96 K06A02S C2006 01 05.49605 10 24 20.48 +08 19 01.7 19.5 V EA023G96 K06A02S C2006 01 05.50598 10 24 23.22 +08 18 48.3 19.7 V EA023G96 K06A02S C2006 01 06.24034 10 27 55.24 +08 02 13.8 20.0 R EA023734 K06A02S C2006 01 06.24934 10 27 57.80 +08 02 00.8 19.7 R EA023734 K06A02S C2006 01 06.25834 10 28 00.47 +08 01 48.8 19.2 R EA023734 K06A02S 5C2006 01 06.40116 10 28 41.83 +07 58 34.1 19.0 R EA023673 K06A02S 5C2006 01 06.40417 10 28 42.69 +07 58 29.7 EA023673 K06A02S 5C2006 01 06.40938 10 28 44.17 +07 58 22.1 EA023673 K06A02S 5C2006 01 06.41551 10 28 45.99 +07 58 13.6 EA023673 K06A02S C2006 01 06.46735 10 29 00.54 +07 57 02.3 19.9 V EA023G96 K06A02S C2006 01 06.47413 10 29 02.48 +07 56 52.4 19.8 V EA023G96 K06A02S C2006 01 06.48086 10 29 04.43 +07 56 42.9 19.7 V EA023G96 Observer details: 673 Table Mountain Observatory, Wrightwood. Observer J. Young. 0.6-m f/16 Cassegrain + CCD. 734 Farpoint Observatory. Observer D. Tibbets. 0.7-m reflector + CCD. G96 Mt. Lemmon Survey. Observers R. A. Kowalski, E. J. Christensen. Measurers E. C. Beshore, E. J. Christensen, G. J. Garradd, A. D. Grauer, R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught. 1.5-m reflector + CCD. Orbital elements: 2006 AS2 PHA, Earth MOID = 0.0106 AU Epoch 2006 Jan. 5.0 TT = JDT 2453740.5 MPC M 338.35061 (2000.0) P Q n 0.32215817 Peri. 79.90612 -0.89685807 +0.44076481 a 2.1074468 Node 126.23705 -0.42167794 -0.82672106 e 0.6417071 Incl. 2.63211 -0.13354144 -0.34965507 P 3.06 H 20.2 G 0.15 From 18 observations 2006 Jan. 5-6. Ephemeris: 2006 AS2 a,e,i = 2.11, 0.64, 3 q = 0.7551 Date TT R. A. (2000) Decl. Delta r Elong. Phase V 2006 01 05 10 22.05 +08 30.0 0.343 1.232 130.2 37.6 19.8 2006 01 15 11 23.73 +03 30.0 0.236 1.134 124.3 45.8 19.1 2006 01 25 13 21.33 -06 14.7 0.168 1.037 103.6 67.3 18.8 2006 02 04 16 07.97 -16 16.0 0.175 0.946 71.9 98.0 19.8 2006 02 14 18 04.58 -18 32.5 0.249 0.866 54.1 112.4 21.2 Gareth V. Williams (C) Copyright 2006 MPC M.P.E.C. 2006-A23
Target Name: 2006 AS2 HMag: 20.3 Diameter: 0.52 km (an educated guess for its absolute magnitude and assuming a C-class optical albedo) Period: 4.5 h (B. D. Warner and A. W. Harris, pers. comm.) Goldstone SNRs UTC LST # max start date window window RA, dec dist runs SNR SNR/run ----------------------------------------------------------------------------- 2009 Feb 06 14:51-03:13 00:20-12:44 97, 35 0.041 432 470 26 2009 Feb 07 13:58-02:42 23:31-12:17 87, 39 0.034 516 990 47 2009 Feb 08 12:44-01:44 22:21-11:23 72, 43 0.028 611 2000 89 2009 Feb 09 11:07-00:04 20:47-09:46 50, 44 0.025 688 3400 140 2009 Feb 10 09:28-21:55 19:12-07:41 23, 41 0.024 689 4100 170 2009 Feb 11 08:23-19:58 18:11-05:48 2, 32 0.025 610 3000 130 2009 Feb 12 07:51-18:32 17:43-04:25 347, 22 0.030 503 1600 77 2009 Feb 13 07:35-17:32 17:30-03:29 338, 15 0.036 409 760 40 2009 Feb 14 07:27-16:48 17:26-02:49 333, 9 0.043 336 360 21 Goldstone SNRs assume Ptx = 430 kW Arecibo SNRs UTC LST # max start date window window RA, dec dist runs SNR SNR/run ----------------------------------------------------------------------------- 2009 Feb 02 01:57-04:36 06:20-08:59 115, 25 0.080 54 340 49 2009 Feb 03 01:47-04:22 06:14-08:49 113, 26 0.071 58 530 73 2009 Feb 04 01:36-04:05 06:06-08:36 110, 28 0.063 63 860 110 2009 Feb 05 01:24-03:42 05:58-08:17 107, 30 0.054 66 1400 190 2009 Feb 06 01:11-03:10 05:49-07:49 102, 33 0.047 65 2300 310 2009 Feb 07 00:59-02:19 05:41-07:01 95, 36 0.039 51 3100 470 ...too far north for Arecibo to track from Feb. 8-10... 2009 Feb 11 17:47-20:01 22:48-01:02 358, 30 0.026 121 26000 2400 2009 Feb 12 16:37-19:18 21:41-00:23 345, 21 0.031 126 14000 1400 2009 Feb 13 16:02-18:38 21:10-23:47 337, 14 0.037 104 7000 710 2009 Feb 14 15:45-18:03 20:57-23:16 332, 9 0.044 79 3300 390 2009 Feb 15 15:37-17:33 20:53-22:49 328, 5 0.052 58 1600 210 2009 Feb 16 15:35-17:05 20:55-22:25 325, 2 0.060 39 670 120 2009 Feb 17 15:39-16:37 21:03-22:01 323, 0 0.068 22 270 61 Arecibo SNRs assume Ptx = 700 kW.
Goldstone Schedule UT UT PST AST Duration Round-trip DOY Date TX Window TX Window TX Window hh:mm time (sec) SNR/Run --- ---- --------- --------- --------- --------- ------- ------- 038 Feb 07 0600-1005 2200-0205 Feb. 6-7 0200-0605 Feb 7 4:05 37 47 039-040 Feb 08-09 2145-0130 1345-1730 Feb. 8 1745-2130 Feb 8 3:45 27 140 Arecibo Schedule 042 Feb 11 1747-2001 0947-1201 Feb 11 1347-1601 Feb 11 2:14 26 2400 043 Feb 12 1637-1918 0837-1118 Feb 12 1237-1518 Feb 12 2:41 31 1400 044 Feb 13 1602-1838 0802-1038 Feb 13 1202-1438 Feb 13 2:36 37 710 045 Feb 14 1545-1803 0745-1003 Feb 14 1145-1403 Feb 14 2:18 44 390 046 Feb 15 1537-1733 0737-0933 Feb 15 1137-1333 Feb 15 1:56 52 210 047 Feb 16 1535-1705 0735-0905 Feb 16 1135-1305 Feb 16 1:30 60 120
From Horizons, 2009 January 25: JPL solution 24, #obs = 142 (2003-2009) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S-sig DOP_X-sig RT_delay-sig 2009-Feb-01 00:00 *m 116.30990 23.67896 0.089558777260380 1.16767802 0.49 1.74 0.001366 2009-Feb-02 00:00 *m 114.80610 24.74609 0.080763808884575 1.35809286 0.50 1.78 0.001378 2009-Feb-03 00:00 *m 112.92152 26.04499 0.072096687335434 1.60474234 0.51 1.83 0.001389 2009-Feb-04 00:00 *m 110.48973 27.65248 0.063586689392386 1.93572973 0.53 1.88 0.001399 2009-Feb-05 00:00 *m 107.23566 29.67621 0.055283589324997 2.40145107 0.54 1.94 0.001405 2009-Feb-06 00:00 *m 102.67859 32.26008 0.047274200796850 3.09672499 0.56 2.01 0.001401 2009-Feb-07 00:00 *m 95.92945 35.55970 0.039715324233611 4.20302806 0.58 2.08 0.001377 2009-Feb-08 00:00 *m 85.29152 39.57221 0.032899637889872 6.04140079 0.60 2.16 0.001310 2009-Feb-09 00:00 * 67.86984 43.43143 0.027372411452809 8.97114622 0.62 2.23 0.001151 2009-Feb-10 00:00 * 41.87137 43.93376 0.024030536577349 12.5092997 0.63 2.27 0.000849 - - - - - - - - - - - - - - - - - - - - From Jon Giorgini, 2009 February 2: With 238 optical measurements (2003-Aug-23 to 2009-Feb-1), 2006 AS2 soln. #32 was computed (now in Horizons). Formal 3-sigma X-band uncertainties are shown below. Date__(UT)__HR:MN POS_3sigma DOP_X-sig RT_delay-sig 2009-Feb-06 00:00 2.04827140 1.98 0.001364 2009-Feb-07 00:00 3.08733054 2.05 0.001338 2009-Feb-08 00:00 4.89402094 2.11 0.001266 2009-Feb-09 00:00 7.83629971 2.15 0.001097 2009-Feb-10 00:00 11.4209206 2.12 0.000770
PLANS FOR THE FEBRUARY 7 TRACK: Due to the 4.5 h rotation period and an educated guess for the diameter, we are expecting a bandwidth in the realm of 10 Hz, so we will start with the following setup, which will resolve the echo in Doppler frequency and allow us to see echoes quickly: TX polarization RCP RCV polarization LCP & RCP Frequency hops: 2 Dwell 10 seconds Bandwidth: 4000 Hz Sampling interval: 2500 x 0.1 usec VME FFT for PSD files: 4096 for 0.98-Hz resolution Then we will do 10 usec and 11 usec ranging with the standard setups below. We hope to finish with 1/8 usec imaging. Possible ranging setups: --------------------------------------------------------------------------- 127 x 64 10-usec single sample baud 10 usec code 127 gates 127 PRP 1270 usec FFT 64 CLT VME ? PFS ? ncoh 1 bandwidth 787.4 Hz resolution 12.3 Hz TXOFF +100 Hz -> echo will be centered at +8 bins or in bin 32 + 8 = 40 --------------------------------------------------------------------------- 127 x 64 11-usec single sample baud 11 usec code 127 gates 127 PRP 1397 usec FFT 64 CLT VME ? PFS ? ncoh 1 bandwidth 715.8 Hz resolution 11.2 Hz TXOFF +100 Hz --> echo will be centered at +9 bins or in bin 32 + 9 = 41 ------------------------------------------------------------------------- 127 x 64 7-usec single sample baud 7 usec code 127 gates 127 PRP 889 FFT 64 CLT VME ? PFS ? ncoh 1 bandwidth 1124.9 Hz resolution 17.6 Hz TXOFF +60 -> echo would be centered at +3.4 bins w/perfect ephemeris ------------------------------------------------------------------------- 127 x 64 1-usec single sample baud 1 usec code 127 gates 127 PRP 127 FFT 64 CLT 4 ncoh 15 bandwidth 525 Hz resolution 8.2 Hz TXOFF +100 -> echo would be centered at +12.2 bins or in bin 32 + 12.2 = 44 ------------------------------------------------------------------------------- 0.125-usec ranging setup JX1XS001 revised baud 0.125 usec code 127 gates 127 FFT 64 ncoh 984 bandwidth 64.016384 Hz resolution 1.000256 Hz TXOFF +15 Hz to put echo at 32 + 15 = bin 47 PFS CLT gate ? VME CLT gate ? _____________________________________________________________________ POSSIBLE RANGING SETUPS: (code=127, FFT=64, single-pol'n) These are from JX, w/ max-band (min-acc) options from Ray Jurgens. Currently configured for 5-sec records. _______________________________________________________________________ Setup Baud RP 1-acc 1-acc usec m usec band res acc band res _______________________________________________________________________ JX1XS110 11.000 1650 1397.0 715.8 11.2 2 358 5.6 JX1XS070 7.000 1050 889.0 1124.9 17.6 3 375 5.9 JX1XS020 2.000 300 254.0 3937.0 61.5 12 328 5.1 4 984 15.4 JX1XS010 1.000 150 127.0 7874.0 123.0 41 192 3.0 8 984 15.4 JX1XS005 0.500 75 63.5 15748.0 246.1 123 128 2.0 15 1050 16.4 JX1XS002 0.250 37.5 31.75 31496.1 492.1 492 64 1.0 30 1050 16.4 JX1XS001 0.125 18.75 15.875 62992.1 984.3 1970 32 0.5 60 1050 16.4 ____________________________________________________________________
OSOD and predicts are on aardvark: /export/data3/osod/ops/2006as2/PRDX.OUT.s34 /PUNCH.OUT.s34 /EPH.OUT.s34 POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD 2009 02 07 038 050000 94.2119 36.3656 A 38.1 32 2009 02 07 038 060000 93.8092 36.5256 A 37.8 2009 02 07 038 070000 93.3999 36.6846 A 37.5 2009 02 07 038 080000 92.9850 36.8428 A 4.3 1.6 37.3 2009 02 07 038 090000 92.5655 37.0004 A 37.0 2009 02 07 038 100000 92.1420 37.1579 A 36.7 2009 02 07 038 110000 91.7148 37.3159 A 36.4 2009 02 08 039 210000 70.7246 43.0236 A 27.9 34 2009 02 08 039 220000 69.8535 43.1731 A 6.8 1.1 27.7 2009 02 08 039 230000 68.9584 43.3172 AB 27.5 2009 02 09 040 000000 68.0399 43.4545 B 7.0 1.1 27.3 2009 02 09 040 010000 67.0991 43.5839 BC 27.1 2009 02 09 040 020000 66.1375 43.7042 C 7.3 0.8 26.9 2009 02 09 040 030000 65.1572 43.8144 C 26.8 Transmit offsets are given in millidegrees.
PRDX.OUT.s32 TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL 2009 FEB 07 05:00 38.1220169079 700363.725 1.3545 36.3656 94.212 88.555 2009 FEB 07 05:10 38.0729736296 699004.562 3.9280 36.3924 94.145 86.675 2009 FEB 07 05:20 38.0240255850 697646.359 6.5017 36.4191 94.078 84.643 2009 FEB 07 05:30 37.9751726682 696290.722 9.0755 36.4458 94.011 82.584 2009 FEB 07 05:40 37.9264146434 694939.245 11.6496 36.4724 93.944 80.517 2009 FEB 07 05:50 37.8777511460 693593.510 14.2239 36.4990 93.877 78.448 2009 FEB 07 06:00 37.8291817272 692255.083 16.7983 36.5256 93.809 76.379 2009 FEB 07 06:10 37.7807058295 690925.510 19.3729 36.5522 93.741 74.311 2009 FEB 07 06:20 37.7323227699 689606.315 21.9478 36.5787 93.673 72.246 2009 FEB 07 06:30 37.6840317685 688298.996 24.5227 36.6052 93.605 70.183 2009 FEB 07 06:40 37.6358319411 687005.022 27.0979 36.6317 93.537 68.125 2009 FEB 07 06:50 37.5877223021 685725.831 29.6732 36.6582 93.469 66.071 2009 FEB 07 07:00 37.5397017747 684462.825 32.2487 36.6846 93.400 64.021 2009 FEB 07 07:10 37.4917691588 683217.370 34.8243 36.7110 93.331 61.977 2009 FEB 07 07:20 37.4439231955 681990.790 37.4001 36.7374 93.262 59.938 2009 FEB 07 07:30 37.3961624990 680784.368 39.9760 36.7638 93.193 57.906 2009 FEB 07 07:40 37.3484856306 679599.339 42.5521 36.7901 93.124 55.881 2009 FEB 07 07:50 37.3008910312 678436.891 45.1283 36.8165 93.055 53.862 2009 FEB 07 08:00 37.2533770960 677298.162 47.7046 36.8428 92.985 51.852 2009 FEB 07 08:10 37.2059421153 676184.236 50.2811 36.8691 92.915 49.850 2009 FEB 07 08:20 37.1585843054 675096.142 52.8577 36.8953 92.846 47.857 2009 FEB 07 08:30 37.1113018395 674034.852 55.4344 36.9216 92.776 45.874 2009 FEB 07 08:40 37.0640927887 673001.279 58.0112 36.9479 92.706 43.901 2009 FEB 07 08:50 37.0169551892 671996.273 60.5881 36.9741 92.636 41.938 2009 FEB 07 09:00 36.9698870198 671020.624 63.1652 37.0004 92.566 39.987 2009 FEB 07 09:10 36.9228861793 670075.056 65.7424 37.0266 92.495 38.049 2009 FEB 07 09:20 36.8759505361 669160.227 68.3196 37.0529 92.425 36.123 2009 FEB 07 09:30 36.8290779325 668276.728 70.8970 37.0791 92.354 34.211 2009 FEB 07 09:40 36.7822661362 667425.082 73.4745 37.1054 92.284 32.313 2009 FEB 07 09:50 36.7355129074 666605.741 76.0521 37.1317 92.213 30.431 2009 FEB 07 10:00 36.6888159682 665819.088 78.6298 37.1579 92.142 28.565 2009 FEB 07 10:10 36.6421730162 665065.434 81.2076 37.1842 92.071 26.716 2009 FEB 07 10:20 36.5955817210 664345.019 83.7855 37.2105 92.000 24.885 2009 FEB 07 10:30 36.5490397468 663658.010 86.3635 37.2368 91.929 23.073 2009 FEB 07 10:40 36.5025447662 663004.502 88.9416 37.2631 91.858 21.281 2009 FEB 07 10:50 36.4560944035 662384.515 91.5198 37.2895 91.786 19.511 2009 FEB 07 11:00 36.4096863374 661797.999 94.0981 37.3159 91.715 17.763
2006 AS2 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 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/2006AS2/2006AS2_planning.html