Goldstone Radar Observations Planning: 2001 AV43
2001 AV43 was discovered on January 5, 2001 by LINEAR. Its absolute magnitude of 24.4 suggests a diameter within a factor of two of about 40 meters. 2001 AV43 has a rapid rotation period 0.17 hours and a lightcurve amplitude of 1.2 magnitudes, suggesting a shape with substantial elongation (C. Hergenrother, pers. comm.). A weak radar detection was obtained at Arecibo shortly after discovery. This asteroid will approach within 0.007 AU (about 2.7 lunar distances) on November 18, 2013, when it will be a strong radar target at Goldstone and Arecibo. The SNRs should be strong enough for imaging. This object had large orbital uncertainties until it was observed by station W85 (Las Cumbres Observatory Global Telescope A) at Cerro Tololo, Chile, on Sep. 13, 2013. The uncertainties are now small enough that pointing will not be a problem during the radar observations on Nov. 11.
Orbital and Physical Characteristics Provisional Designation 2001 AV43 Discoverer LINEAR Discovery date 2001 Jan 05 orbit type Apollo Close approach dist. 0.045 AU Close approach dist. 17.5 LD Close approach date Sep 24 semimajor axis 1.278 AU eccentricity 0.239 inclination 0.28 deg perihelion distance 0.973 AU aphelion distance 1.583 AU Tisserand parameter 5.036 Not cometary absolute magnitude (H) 24.4 diameter 40 meters +- a factor of two optical albedo ? rotation period 0.166+-0.003 h Whiteley et al. 2002; Hergenrother et al., in prep. lightcurve amplitude 1.2 mag C. Hergenrother, pers. comm. pole direction ? spectral class ? Last update: 2013 November 15
FUTURE CLOSE APPROACHES Date (CT) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p ---------------------- ----- ------- ------- ------- ------ ------ ------ ------- A.D. 2013 Nov 18.89887 Earth .007600 .007599 .007600 3.605 1.01 1.03E5 .000000 A.D. 2027 Aug 23.19248 Mars .057208 .057187 .057230 4.530 12.18 52888. .000000 A.D. 2029 Nov 11.07468 Moon .001645 .001634 .001657 4.876 20.72 18321. .000000 A.D. 2029 Nov 11.67127 Earth .002117 .002101 .002133 3.993 27.39 18532. .000000 A.D. 2078 Dec 15.21955 Earth .004684 .004425 .010436 3.892 10309. 2652.8 .000000 A.D. 2081 Dec 11.13605 Earth .004951 .004563 .252208 3.783 4.44E5 3325.3 .000000 NOTE: post-epoch CA list was truncated due to Earth TCA3Sg exceeding the set limit. Computed using JPL/Horizons solution 20.
2001 AV43 http://www.minorplanetcenter.net/mpec/K01/K01A52.html
GOLDSTONE SNRS 2001 AV43: D = 0.04 km, P = 0.17 h, OC albedo = 0.1 w DOY Date window RA, dec dist runs SNR/day SNR/run 45 312-313 2013 Nov 08-09 22:50-06:30 332, -8 0.021 601 38 2 45 313-314 2013 Nov 09-10 22:40-06:15 329, -9 0.019 650 54 2 45 314-315 2013 Nov 10-11 22:25-06:00 327, -9 0.018 708 78 3 * Scheduled 46 315-316 2013 Nov 11-12 22:10-05:40 324, -9 0.016 775 110 5 46 316-317 2013 Nov 12-13 21:55-05:20 320, -9 0.014 853 180 7 * Scheduled 46 317-318 2013 Nov 13-14 21:30-04:55 314, -10 0.012 945 280 10 46 319-320 2013 Nov 14-15 21:05-04:20 308, -10 0.011 1050 440 15 46 321-322 2013 Nov 15-16 20:30-03:40 300, -10 0.010 1167 710 23 46 323-324 2013 Nov 16-17 19:45-02:55 289, -10 0.009 1288 1100 33 * Scheduled 46 324-325 2013 Nov 17-18 18:45-02:00 276, -9 0.008 1395 1500 43 47 325-326 2013 Nov 18-19 17:40-01:00 261, -8 0.008 1461 1700 48 47 323-324 2013 Nov 19-20 16:30-00:05 246, -7 0.008 1463 1500 44 47 324 2013 Nov 20 15:30-23:15 233, -5 0.009 1402 1200 34 47 325 2013 Nov 21 14:35-22:35 223, -3 0.010 1301 780 24 47 326 2013 Nov 22 13:50-22:05 214, -2 0.011 1186 490 16 47 327 2013 Nov 23 13:15-21:40 208, 0 0.013 1074 310 10 Enters the beam at Arecibo 47 328 2013 Nov 24 12:50-21:20 203, 0 0.014 973 190 7 48 329 2013 Nov 25 12:30-21:05 199, +1 0.016 885 130 5 48 330 2013 Nov 26 12:10-20:50 196, +2 0.018 808 84 3 48 331 2013 Nov 27 11:55-20:40 194, +2 0.020 742 58 2 Rise-set times changed by a maximum of about 12 minutes relative to the solution available prior to when astrometry was obtained in Sep. 2013. Goldstone SNRs assume Ptx = 450 kW and Tsys = 17 K - - - - - - - - - - - ARECIBO SNRS start date window RA, dec dist runs SNR/day SNR/run 2013 Nov 23 13:49-14:34 209, -1 0.012 101 1400 150 Scheduled 2013 Nov 24 13:16-14:20 204, 0 0.014 134 1200 110 Scheduled 2013 Nov 25 12:51-14:05 200, +1 0.016 138 920 85 2013 Nov 26 12:30-13:53 197, +1 0.017 134 680 64 2013 Nov 27 12:14-13:41 194, +2 0.019 129 500 49 2013 Nov 28 11:59-13:31 192, +2 0.021 123 370 37 Scheduled 2013 Nov 29 11:47-13:22 190, +2 0.023 116 280 29 Scheduled 2013 Nov 30 11:36-13:13 189, +3 0.025 114 210 22 Scheduled 2013 Dec 01 11:27-13:05 188, +3 0.027 108 160 18 Scheduled 2013 Dec 02 11:18-12:58 187, +3 0.029 102 130 14 2013 Dec 03 11:10-12:51 186, +3 0.031 96 100 12 2013 Dec 04 11:02-12:44 185, +3 0.033 91 80 9 Arecibo SNRs assume Ptx = 900 kW and Tsys = 23 K. Currently Arecibo system parameters are closer to Ptx = 500 kW and Tsys = 30 K, so the numbers above are probably optimistic.
315 0000 0130 0415 0445 DSS-14 GSSR AST 2001 AV43 316 2315 0045 0405 0435 DSS-14 GSSR AST 2001 AV43 320 2045 2215 0040 0110 DSS-14 GSSR AST 2001 AV43 UT UT PST Duration Round-trip SNR/ week DOY Date TX Window TX Window hh:mm time (sec) Run 46 315 Nov 11 0030-0415 1630-2015 Nov 10 3:45 17 3 Begin 30 minutes into precal 46 317 Nov 12-13 2345-0405 1545-2005 Nov 12 4:20 14 7 Begin 30 minutes into precal 46 320-321 Nov 16-17 2115-0040 1315-1640 Nov 16 3:25 8.5 33 Begin 30 minutes into precal The RTT on Nov. 16-17 is so short that we will probably get only about 5 seconds of data during each transmit/receive cycle. Even so, we're going to do these observations monostatically because the SNRs will be much higher and because the 8.5 second RTT should still provide 5 seconds of data per run. The asteroid's Doppler broadening is sufficiently large that 5 seconds of data will still resolve the echoes in Doppler frequency. The combined Goldstone + Arecibo data are going to provide really thorough rotation coverage by this object: we'll see many rotations during each track. Arecibo tracks: UT UT PST AST Duration Round-trip SNR/ DOY Date TX Window TX Window TX Window hh:mm time (sec) Run --- ---- --------- --------- --------- -------- --------- ----- 327 Nov 23 1349-1434 0539-0634 0949-1034 00:45 12 150 328 Nov 24 1316-1420 0516-0620 0916-1020 01:04 14 110 ...skip three days due to conflicts... 332 Nov 28 1159-1331 0359-0531 0759-0931 01:32 21 37 333 Nov 29 1147-1322 0347-0522 0747-0922 01:35 23 29 334 Nov 30 1136-1313 0336-0513 0736-0913 01:37 25 22 335 Dec 1 1127-1305 0327-0505 0727-0905 01:38 27 18
From Jon Giorgini, 2013 November 15: I incremented to s37 by deweighting the now-apparent 4-6" outlier discovery data, based on the comments about a 3-sigma update last Tuesday. The difference is s37:2013 NOV 16 22:00 8.5799774681 103593.857 339.6678 -10.0226 289.577 s35:2013 NOV 16 22:00 8.5800113920 103592.216 339.6682 -10.0228 289.576 ------------ ---------- 0.0000339 1.641 So 33.9 usec and 1.64 Hz different, both about 1.4 sigma. So it is probably worthwhile going with s37 and its discounted outlier data. Formal 3-sigma uncertainties with s37: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2013-Nov-16 21:00 4.459 3.41 0.000070 2013-Nov-16 22:00 4.474 3.48 0.000072 2013-Nov-16 23:00 4.487 3.52 0.000073 2013-Nov-17 00:00 4.499 3.53 0.000075 2013-Nov-17 01:00 4.508 3.52 0.000076 I doubt the outliers in 2000 are dynamics-related, since data from other sites starting four months later does not share the problem. - - - - - - - - - - From Jon Giorgini, 2013 November 8: For 2001 AV43, 103 optical measurements (2000-Aug-30 to 3013-Oct-28) were combined with the one Doppler measurement obtained in 2001 at Arecibo to estimate orbit solution #27. OSOD with nominal predicts has been established on aardvark in the /2001av43 sub-directory. Formal 3-sigma X-band uncertainties for s27: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2013-Nov-11 00:00 5.163 1.46 0.001089 2013-Nov-12 00:00 6.600 2.57 0.001075 2013-Nov-13 00:00 8.580 4.26 0.001049 2013-Nov-14 00:00 11.341 6.90 0.001006 2013-Nov-15 00:00 15.185 11.04 0.000933 2013-Nov-16 00:00 20.362 17.32 0.000814 2013-Nov-17 00:00 26.646 25.83 0.000630 - - - - - - - - - - From Horizons, 2013 Sep. 24, Solution #16, #obs = 56 (2000-2013) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2013-Nov-01 00:00 * 341.30130 -7.19121 0.03659566864287 3.025 0.51 1.85 0.001464 2013-Nov-02 00:00 * 340.48808 -7.31809 0.03467698641829 3.135 0.49 1.79 0.001482 2013-Nov-03 00:00 *m 339.60304 -7.44874 0.03276420009164 3.265 0.48 1.73 0.001498 2013-Nov-04 00:00 *m 338.63169 -7.58430 0.03085716811649 3.423 0.45 1.64 0.001515 2013-Nov-05 00:00 *m 337.55554 -7.72615 0.02895599027444 3.619 0.42 1.54 0.001530 2013-Nov-06 00:00 *m 336.35074 -7.87604 0.02706112859563 3.871 0.39 1.40 0.001544 2013-Nov-07 00:00 *m 334.98612 -8.03617 0.02517358473735 4.201 0.34 1.24 0.001556 2013-Nov-08 00:00 *m 333.42032 -8.20921 0.02329514926799 4.642 0.29 1.04 0.001567 2013-Nov-09 00:00 *m 331.59779 -8.39835 0.02142875075091 5.244 0.25 0.90 0.001574 2013-Nov-10 00:00 *m 329.44278 -8.60719 0.01957895942960 6.081 0.29 1.04 0.001577 2013-Nov-11 00:00 *m 326.85035 -8.83936 0.01775274848427 7.259 0.47 1.69 0.001574 * 2013-Nov-12 00:00 *m 323.67288 -9.09749 0.01596069725374 8.939 0.81 2.96 0.001562 2013-Nov-13 00:00 *m 319.70028 -9.38058 0.01421895620037 11.359 1.39 5.04 0.001535 * 2013-Nov-14 00:00 *m 314.63274 -9.67800 0.01255250261333 14.864 2.31 8.40 0.001485 2013-Nov-15 00:00 *m 308.05189 -9.95586 0.01100044551937 19.911 3.80 13.81 0.001398 2013-Nov-16 00:00 *m 299.42034 -10.13031 0.00962394285077 26.929 6.12 22.23 0.001251 2013-Nov-17 00:00 * 288.20638 -10.02960 0.00851486452087 35.747 9.35 33.97 0.001015 * 2013-Nov-18 00:00 * 274.30813 -9.39573 0.00779463680796 44.415 12.74 46.29 0.000676 2013-Nov-19 00:00 * 258.71070 -8.05092 0.00758045083655 48.919 14.35 52.17 0.000313 2013-Nov-20 00:00 * 243.46100 -6.17094 0.00791709731449 46.691 13.00 47.25 0.000401 2013-Nov-21 00:00 * 230.37051 -4.20851 0.00874268101624 39.809 9.94 36.14 0.000745 2013-Nov-22 00:00 * 220.03400 -2.50484 0.00993606271352 31.984 6.99 25.39 0.001026 2013-Nov-23 00:00 * 212.14976 -1.15655 0.01138128299698 25.241 4.81 17.47 0.001228 2013-Nov-24 00:00 * 206.15701 -0.12578 0.01299327505424 20.006 3.36 12.19 0.001372 2013-Nov-25 00:00 * 201.55070 0.65813 0.01471575085824 16.072 2.41 8.76 0.001476 2013-Nov-26 00:00 * 197.95139 1.25867 0.01651238419473 13.121 1.79 6.50 0.001554 2013-Nov-27 00:00 * 195.08996 1.72413 0.01835947386509 10.884 1.37 4.99 0.001614 2013-Nov-28 00:00 * 192.77776 2.08933 0.02024115216714 9.162 1.09 3.95 0.001661 2013-Nov-29 00:00 * 190.88156 2.37914 0.02214646988716 7.814 0.88 3.21 0.001700 2013-Nov-30 00:00 * 189.30591 2.61142 0.02406764822089 6.742 0.73 2.67 0.001732 2013-Dec-01 00:00 * 187.98124 2.79913 0.02599902156040 5.877 0.63 2.27 0.001760 Solution 16 represents an enormous improvement. It will still be helpful to get additional astrometry, but the pointing uncertainties on the first track (Nov. 11) are small enough for the radar observations. - - - - - - - - - Previous solution (not recorded, but probably #14), from the summer of 2013: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2013-Nov-01 00:00 * 341.56324 -7.07555 0.03623173466258 4167.094 719.94 2616.60 1.461973 2013-Nov-03 00:00 *m 339.85936 -7.33035 0.03238867338910 4113.454 701.59 2549.89 1.508816 2013-Nov-05 00:00 *m 337.79814 -7.60508 0.02856935184356 3956.268 674.46 2451.29 1.553782 2013-Nov-07 00:00 *m 335.20022 -7.91269 0.02477650996662 3614.571 626.28 2276.20 1.596100 2013-Nov-09 00:00 *m 331.75455 -8.27309 0.02102241349713 2946.177 523.61 1903.04 1.633756 2013-Nov-11 00:00 *m 326.88920 -8.71351 0.01733970193893 1955.833 269.06 977.88 1.661093 2013-Nov-13 00:00 *m 319.48406 -9.25455 0.01380585217302 3712.040 442.50 1608.24 1.661056 2013-Nov-15 00:00 *m 307.25820 -9.81640 0.01060691372046 11963.060 2592.64 9422.85 1.578852 2013-Nov-17 00:00 * 286.22839 -9.78276 0.00819909318185 29607.952 8329.03 30271.46 1.250797 2013-Nov-19 00:00 * 255.57530 -7.51941 0.00745336852881 46516.146 14020.88 50958.25 0.466612 2013-Nov-21 00:00 * 227.64040 -3.62989 0.00883179243788 40017.342 9944.09 36141.34 0.398350 2013-Nov-23 00:00 * 210.31582 -0.74926 0.01160366685582 26765.522 5006.59 18196.22 0.917878 2013-Nov-25 00:00 * 200.32320 0.92480 0.01500848066900 17903.163 2596.58 9437.16 1.190773 ********************************************************************************************** Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: (JPL/Horizons solution 16) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2013-Oct-11 00:00 351.90650 -4.59042 0.07959771594134 20.40 153.0981 /T 75.9/ 39.2 2013-Oct-13 00:00 351.10800 -4.85125 0.07512646056387 20.35 150.2892 /T 46.9/ 61.9 2013-Oct-15 00:00 350.28911 -5.10764 0.07077257321241 20.28 147.4610 /T 18.5/ 82.0 2013-Oct-17 00:00 349.44683 -5.35908 0.06651892580117 20.22 144.6109 /T 11.6/ 95.4 2013-Oct-19 00:00 348.57554 -5.60561 0.06235061569845 20.15 141.7338 /T 38.5/100.0 2013-Oct-21 00:00 347.66699 -5.84764 0.05825500661236 20.07 138.8217 /T 65.0/ 95.8 2013-Oct-23 00:00 346.71005 -6.08583 0.05422132444133 19.98 135.8641 /T 90.6/ 84.5 2013-Oct-25 00:00 345.68995 -6.32116 0.05024017895953 19.89 132.8469 /T 115.4/ 68.5 2013-Oct-27 00:00 344.58671 -6.55506 0.04630330568348 19.79 129.7510 /T 140.1/ 50.0 2013-Oct-29 00:00 343.37277 -6.78960 0.04240355855960 19.68 126.5500 /T 165.1/ 31.2 2013-Oct-31 00:00 342.00929 -7.02775 0.03853502146326 19.56 123.2068 /T 167.3/ 14.4 2013-Nov-02 00:00 340.44001 -7.27376 0.03469314402867 19.43 119.6677 /T 139.5/ 3.0 2013-Nov-04 00:00 338.58019 -7.53389 0.03087507101672 19.29 115.8515 /T 109.7/ 0.3 2013-Nov-06 00:00 336.29552 -7.81781 0.02708085856481 19.13 111.6296 /T 78.5/ 8.2 2013-Nov-08 00:00 333.36130 -8.14055 0.02331682485914 18.95 106.7867 /T 46.6/ 25.3 2013-Nov-10 00:00 329.38068 -8.52407 0.01960274541410 18.77 100.9429 /T 14.2/ 47.3 2013-Nov-12 00:00 323.61089 -8.99339 0.01598678907500 18.61 93.3904 /T 19.0/ 69.2 2013-Nov-14 00:00 314.58203 -9.54247 0.01258097145520 18.53 82.7387 /T 54.5/ 86.7 2013-Nov-16 00:00 299.41591 -9.95052 0.00965392723688 18.86 66.3114 /T 95.1/ 97.3 2013-Nov-18 00:00 274.42084 -9.18081 0.00782159563405 n.a. 41.0084 /T 143.6/ 99.8 2013-Nov-20 00:00 243.67697 -5.98054 0.00793254069573 n.a. 15.8655 /T 156.2/ 94.7 2013-Nov-22 00:00 220.23376 -2.36251 0.00993866360326 n.a. 24.4206 /L 111.2/ 83.2 2013-Nov-24 00:00 206.30827 -0.01753 0.01298728606976 n.a. 38.4225 /L 74.0/ 67.1 2013-Nov-26 00:00 198.06491 1.34480 0.01650101139464 n.a. 48.0981 /L 42.3/ 48.3 2013-Nov-28 00:00 192.86548 2.16046 0.02022615918766 n.a. 55.0338 /L 14.3/ 28.9 2013-Nov-30 00:00 189.37578 2.67188 0.02405001664170 21.17 60.3720 /L 21.1/ 11.9 2013-Dec-02 00:00 186.91298 3.00434 0.02791669827347 21.18 64.7373 /L 50.7/ 1.5 2013-Dec-04 00:00 185.10471 3.22529 0.03179577980641 21.21 68.4788 /L 81.8/ 1.5 2013-Dec-06 00:00 183.73540 3.37290 0.03566948042252 21.26 71.8005 /L 112.8/ 12.9 2013-Dec-08 00:00 182.67415 3.46979 0.03952601341633 21.31 74.8270 /L 142.6/ 32.2 2013-Dec-10 00:00 181.83736 3.53036 0.04335568599969 21.35 77.6381 /L 169.1/ 54.1
We're going to start with the following setup, which should produce an echo relatively quickly, and then we'll do ranging measurements. Then we'll decide what to do next based on the SNRs. We're expecting a bandwidth of about 20 Hz. CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping...round trip time is too short Bandwidth: 4000 Hz Sampling interval: 1250 x 0.1 usec FFT for PFS files: 2048 for 1.95 Hz resolution Ranging setups: --------------------------------------------------------------------------- 10-usec baud 10 usec code 127 PRP 1270 usec FFT 128 ncoh 1 bandwidth 787 Hz resolution 12.3 Hz TXOFF +100Hz (echo in bin 32 + 8 = 40) --------------------------------------------------------------------------- 11-usec baud 11 usec code 127 PRP 1397 usec FFT 64 ncoh 1 bandwidth 716 Hz resolution 11.2 Hz TXOFF +100 Hz (echo in bin 32 + 9= 41) ------------------------------------------------------------------------- _____________________________________________________________________ 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 will be on aardvark: ...not available yet... POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD ... not available yet... 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
2001 AV43 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 183-610 | 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/2001AV43/2001AV43_planning.html