Goldstone Radar Observations Planning:
2011 JR13, 2013 WF108, Comet 209P/LINEAR, and 2014 JL25
This is a planning page for Goldstone radar observations of three near-Earth asteroids and one comet during ten tracks on May 19 - June 5/6. Below is some background information on each object. 2011 JR13 2011 JR13 was discovered by LINEAR on May 10, 2011. Its absolute magnitude of 19.6 suggests a diameter within a factor of two of 0.4 km, but otherwise its physical properties are unknown. 2011 JR13 will approach within 0.051 AU on May 21, 2014. The SNRs might be strong enough to obtain ranging measurements but we do not expect it to be strong enough for high-resolution imaging. Four tracks are scheduled at Goldstone, one of which overlaps with 2013 WF108 (on May 22). 2013 WF108 2013 WF108 was discovered on Nov. 27, 2013 by Pan-STARRS1. It has an absolute magnitude of 20.0, suggesting a diameter of roughly 300 m, but otherwise its physical properties are unknown. It will approach within 0.029 AU on May 23 when the SNRs should be strong enough for imaging. The view periods for 2013 WF108 and 2011 JR13 overlap on May 22. There is also extensive overlap with Comet 209P/LINEAR on May 26-31. NOTE: optical astrometry is needed before the radar observations start because the pointing uncertainties are large. It turns out that additional optical astrometry never materialized, but the asteroid was evidently close to the nominal predicted position because we saw echoes quickly. Comet 209P/LINEAR 2004 CB Comet LINEAR was discovered on February 3, 2004, initially classified as asteroid 2004 CB, and then reclassified as comet LINEAR after cometary activity was detected. It will approach within 0.055 AU on May 29. On May 16, Carl Hergenrother (Univ. of Arizona) reported that the rotation period is about 22 h, with a lightcurve amplitude of 0.7 mag, and that the absolute magnitude of the nucleus is between 16.4-17.0. Most comets have very low albedos, so if the albedo of comet LINEAR is less than 0.08, which seems likely, then the absolute magnitude indicates that the diameter is *at least* 1.9 km. It's possible that it could be as large as 4 km. The slow rotation period and large diameter indicate that this is going to be a very strong radar imaging target and possibly the best opportunity to image a comet that we've ever had. As of early May, this comet has a faint coma and a short tail, but we do not know if the coma will be detectable or not. Dynamical modeling by Lyytinen and Jenniskens predicts that debris shed by this comet may produce a strong but brief meteor shower on the night of May 23-24. An article on Science@NASA is available at: http://science1.nasa.gov/science-news/science-at-nasa/2014/06may_newshower/ The meteor shower could be quite strong with rates of up to 200/hour at the peak (which is only a few hours long), or it could be a complete fizzle. This comet may brighten to about 11th magnitude, possibly bringing it within reach of small telescopes. 2014 JL25 2014 JL25 was discovered by NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft on May 4. Thermal modeling of the WISE data by A. K. Mainzer strongly suggests that this asteroid is optically dark and that it has a diameter of about 290 meters. The WISE data hint that the asteroid may have a high thermal inertia and/or a slow rotation period. This object is in a cometary orbit but so far no signs of cometary activity are visible. This asteroid will approach within 0.026 AU (10 lunar distances) on June 5. Due to its diameter, we should be able to detect radar echoes from 2014 JL25 during time already scheduled for observations of Comet 209P/LINEAR on May 28, 29, and 31. At the time of the closest approach, 2014 JL25 could be a strong imaging target. One additional track is also scheduled on June 5/6 when the SNRs should be close to their peak. The Goldstone data will help to calibrate the diameter estimated from the WISE data, so in a very real sense, the Goldstone observations will be directly supporting a NASA mission. For that reason these observations are quite important. The Minor Planet Center has classified 2011 JR13 and 2013 WF108 as "Potentially Hazardous Asteroids."
Orbital and Physical Characteristics Provisional Designation 2011 JR13 2013 WF108 Comet LINEAR 2014 JL25 Asteroid number Not numbered Not numbered 209P Not numbered Discoverer LINEAR Pan-STARRS1 LINEAR WISE Discovery date 2011 May 10 2013 Nov 27 2004 Feb 03 2014 May 04 Orbit type Apollo Apollo JFC Apollo Close approach dist. 0.051 AU 0.029 AU 0.055 0.026 Close approach dist. 19.7 LD 11.3 LD 21.6 LD 10.1 LD LD = lunar distance Close approach date May 21 May 23 May 29 Jun 5 semimajor axis 1.299 AU 1.992 AU 2.938 AU 2.861 AU eccentricity 0.726 0.574 0.689 0.652 inclination 24.7 deg 23.5 deg 19.1 deg 15.7 deg perihelion distance 0.356 AU 0.849 AU 0.914 AU 0.996 AU aphelion distance 2.242 AU 3.135 AU 4.962 AU 4.727 AU Tisserand parameter 4.629 3.539 2.914 absolute magnitude (H) 19.6 20.0 22.6 diameter 0.38 km 0.32 km 1.9 km+ 0.29 km optical albedo unknown unknown unknown very dark rotation period unknown unknown 21.9 h unknown pole direction unknown unknown unknown unknown lightcurve amplitude unknown unknown 0.7 mag unknown spectral class unknown unknown unknown optically dark PHA PHA N/A Last update: 2014 May 28
Discovery M.P.E.C.s
2011 JR13 http://www.minorplanetcenter.net/mpec/K11/K11J46.html Comet 209P/LINEAR http://www.minorplanetcenter.net/mpec/K04/K04C16.html 2013 WF108 http://www.minorplanetcenter.net/mpec/K13/K13X40.html 2014 JL25 http://www.minorplanetcenter.net/mpec/K14/K14J71.html
SNR Calculations
2011 JR13 GOLDSTONE SNRs Assumptions: D = 0.4 km, P = 2.2 h, OC albedo = 0.1 SNR/ SNR/ w DOY start date window RA, dec dist runs day run 20 137 2014 May 17 06:10-14:40 273, -2 0.076 217 19 1 20 138 2014 May 18 05:50-15:15 276, +7 0.065 276 38 2 21 139 2014 May 19 05:30-16:05 279, +19 0.056 350 69 4 Scheduled 21 140 2014 May 20 05:10-17:10 285, +35 0.051 433 100 6 Scheduled 21 141 2014 May 21 04:50-19:00 296, +51 0.051 508 120 6 Scheduled 21 142 2014 May 22 04:40-22:15 314, +65 0.056 588 90 4 Scheduled 21 143-144 2014 May 23-24 04:45-02:10 348, +73 0.065 647 54 2 21 144-145 2014 May 24-25 06:05-03:05 22, +72 0.077 549 28 1 Goldstone SNRs assume Ptx = 450 kW. ARECIBO SNRs start date window RA, dec dist runs SNR/day SNR/run 2014 May 18 06:03-08:09 275, +6 0.066 57 430 61 2014 May 19 05:52-08:39 279, +18 0.057 84 900 100 2014 May 20 06:29-08:33 284, +32 0.052 72 1100 140 Arecibo SNRs assume Ptx = 900 kW and Tsys = 23 K. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2013 WF108 GOLDSTONE SNRs Assumptions: D = 0.29 km, P = 2.2 h, OC albedo = 0.1 w DOY start date window RA, dec dist runs SNR/day SNR/run 20 137-138 2014 May 17-18 17:40-02:00 86, -3 0.068 223 18 1 20 138-139 2014 May 18-19 17:30-02:15 87, +2 0.058 273 35 2 21 139-140 2014 May 19-20 17:15-02:40 89, +8 0.049 344 71 4 21 140-141 2014 May 20-21 17:00-03:15 92, +16 0.041 446 150 8 21 141-142 2014 May 21-22 16:45-04:05 96, +28 0.034 590 330 15 Scheduled 21 142-143 2014 May 22-23 16:30-05:40 105, +44 0.030 772 610 24 Scheduled 21 143-144 2014 May 23-24 16:15-09:35 125, +63 0.029 968 750 26 Scheduled 21 144-145 2014 May 24-25 16:40-14:10 178, +72 0.033 1075 500 17 21 145-146 2014 May 25-26 20:35-14:30 219, +67 0.040 756 220 9 Scheduled 22 146-147 2014 May 26-27 23:10-14:30 233, +60 0.048 561 99 5 Scheduled 22 148 2014 May 28 00:15-14:25 240, +54 0.057 444 48 2 22 149 2014 May 29 00:45-14:20 244, +50 0.067 366 26 1 Scheduled We also have transmit authorization for 2013 WF108 on May 30-31 just in case the SNRs turn out to be strong enough. Goldstone SNRs assume Ptx = 450 kW. ARECIBO SNRs start date window RA, dec dist runs SNR/day SNR/run 2014 May 18 17:52-19:09 87, +1 0.060 38 160 28 2014 May 19 17:28-19:39 89, +7 0.051 75 490 60 2014 May 20 17:19-20:01 91, +15 0.042 111 1100 110 2014 May 21 17:32-20:11 96, +26 0.035 129 2200 210 Arecibo SNRs assume Ptx = 650 kW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Comet 209P/LINEAR GOLDSTONE SNRs Assumptions: D = 1.9 km, P = 21.9 h, OC albedo = 0.1 w DOY start date window RA, dec dist runs SNR/day SNR/run 20 132-133 2014 May 12-13 17:51-09:14 137, +61 0.166 164 35 3 20 133-134 2014 May 13-14 17:59-09:08 139, +60 0.158 171 44 4 20 134-135 2014 May 14-15 18:07-09:02 140, +59 0.149 178 55 4 20 135-136 2014 May 15-16 18:15-08:55 141, +58 0.140 186 70 6 20 136-137 2014 May 16-17 18:24-08:48 142, +56 0.131 195 89 7 20 137-138 2014 May 17-18 18:34-08:41 144, +54 0.122 204 120 9 20 138-139 2014 May 18-19 18:45-08:33 145, +52 0.114 214 150 11 Overlaps 2011 JR13 from 0755-0833. Not enough advance notice to request tx auth 21 139-140 2014 May 19-20 18:56-08:25 146, +50 0.106 225 200 15 21 140-141 2014 May 20-21 19:08-08:16 148, +47 0.098 237 270 19 21 141-142 2014 May 21-22 19:21-08:07 149, +44 0.090 250 380 26 Overlaps 2011 JR13 and 2013 WF108. Transmit authorization requested. 21 142-143 2014 May 22-23 19:36-07:56 151, +39 0.082 263 520 35 Overlaps 2013 WF108. Transmit authorization requested. 21 143-144 2014 May 23-24 19:52-07:44 153, +35 0.075 276 720 47 Overlaps 2013 WF108. Transmit authorization requested. 21 144-145 2014 May 24-25 20:11-07:31 154, +29 0.069 287 990 64 21 145-146 2014 May 25-26 20:31-07:16 156, +22 0.064 293 1300 84 Scheduled 22 146-147 2014 May 26-27 20:56-06:58 158, +14 0.060 293 1700 110 Scheduled 22 147-148 2014 May 27-28 21:24-06:36 160, +5 0.057 281 2000 130 Scheduled 22 148-149 2014 May 28-29 21:59-06:09 162, -5 0.055 255 2000 140 Scheduled 22 140-150 2014 May 29-30 22:41-05:35 164, -15 0.056 213 1700 120 22 150-151 2014 May 30-31 23:38-04:48 166, -24 0.058 154 1100 96 Scheduled 22 152 2014 Jun 01 01:11-03:25 169, -33 0.062 63 510 65 After June 1, comet LINEAR will move too far south for Goldstone to track. Goldstone SNRs assume Ptx = 440 kW ARECIBO SNRs start date window RA, dec dist runs SNR/day SNR/run 2014 May 23 21:47-23:17 152, +35 0.076 34 2200 400 2014 May 24 21:24-23:46 154, +30 0.070 60 4700 640 2014 May 25 21:15-23:59 156, +23 0.064 75 7100 850 2014 May 26 21:19-00:01 158, +15 0.060 80 9300 1100 2014 May 27 21:39-23:46 160, +6 0.057 66 9800 1300 Arecibo SNRs assume Ptx = 900 kW, which is probably optimistic. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2014 JL25 GOLDSTONE SNRs JPL/Horizons solution 3 Assumptions: D = 0.29 km, P = 2.1 h, OC albedo = 0.1, Ptx = 440 kW w DOY start date window RA, dec dist runs SNR/day SNR/run 22 146-147 2014 May 26-27 19:15-08:08 153, +46 0.074 307 15 1 Already scheduled for comet LINEAR 22 147-148 2014 May 27-28 19:11-07:51 152, +44 0.067 332 22 1 Already scheduled for comet LINEAR 22 148-149 2014 May 28-29 19:08-07:32 150, +41 0.060 361 34 2 Already scheduled for comet LINEAR 22 149-150 2014 May 29-30 19:06-07:11 148, +38 0.054 394 52 3 22 150-151 2014 May 30-31 19:04-06:45 146, +34 0.047 431 84 4 Already scheduled for comet LINEAR 22 151-152 2014 May 31-01 19:03-06:16 143, +29 0.041 470 140 7 22 152-153 2014 Jun 01-02 19:04-05:40 140, +22 0.036 509 240 12 23 153-154 2014 Jun 02-03 19:09-04:55 136, +13 0.031 536 400 18 23 154-155 2014 Jun 03-04 19:19-03:57 132, +1 0.028 528 580 27 23 155-156 2014 Jun 04-05 19:43-02:38 126, -13 0.026 451 620 32 23 156-157 2014 Jun 05-06 20:39-00:39 120, -28 0.027 259 380 25 Scheduled ARECIBO SNRs JPL/Horizons solution 3 Assumptions: Ptx = 400 kW start date window RA, dec dist runs SNR/day SNR/run 2014 May 30 20:52-22:28 146, +35 0.048 378 330 38 2014 May 31 20:16-22:35 144, +30 0.042 424 700 68 2014 Jun 01 19:48-22:29 140, +23 0.037 483 1300 110 2014 Jun 02 19:30-22:08 137, +14 0.032 541 2200 170 2014 Jun 03 19:38-21:14 132, +3 0.028 567 2600 250
Track Assignments
UT UT PDT Round-Trip SNR/ Target DOY Date TX Window TX Window time (sec) run 2011 JR13 139 May 19 0755-1430 0055-0730 May 19 56 4 2011 JR13 2011 JR13 140 May 20 1000-1700 0300-1000 May 20 51 6 2011 JR13 2011 JR13 141 May 21 1125-1700 0425-1000 May 21 51 6 2011 JR13 2013 WF108 142 May 22 0015-0405 1715-2105 May 21 34 15 2013 WF108 Date with the smallest uncertainties Comet LINEAR 142 May 22 0015-0805 1715-0105 May 21 90 26 Comet LINEAR 2011 JR13 142 May 22 0440-1130 2140-0430 May 21-22 56 4 2011 JR13 2013 WF108 143 May 23 0330-0540 2030-2240 May 22 30 24 2013 WF108 Comet LINEAR 143 May 23 0330-0540 2030-2240 May 22 82 35 Comet LINEAR 2013 WF108 143-144 May 23-24 2045-0045 1325-1745 May 23 29 26 2013 WF108 Comet LINEAR 143-144 May 23-24 2045-0045 1325-1745 May 23 75 47 Comet LINEAR Comet LINEAR 146 May 26 0110-0700 1810-0000 May 25 64 84 Comet LINEAR 2013 WF108 146 May 26 0110-0700 1810-0000 May 25 40 9 2013 WF108 Comet LINEAR 146-147 May 26-27 2050-0530 1350-2230 May 26 60 110 Comet LINEAR 2014 JL25 146-147 May 26-27 2050-0530 1350-2230 May 26 74 1 2014 JL25 Possibly too distant to detect 2013 WF108 146-147 May 26-27 2310-0530 1610-2230 May 26 48 5 2013 WF108 Comet LINEAR 147-148 May 27-28 2120-0030 1420-1730 May 27 57 130 Comet LINEAR 2014 JL25 147-148 May 27-28 2120-0030 1420-1730 May 27 67 1 2014 JL25 Comet LINEAR 149 May 29 0130-0605 1830-2305 May 28 55 140 Comet LINEAR 2014 JL25 149 May 29 0130-0605 1830-2305 May 28 60 2 2014 JL25 2013 WF108 149 May 29 0130-0605 1830-2305 May 28 67 1 2013 WF108 Possibly too distant to detect Comet LINEAR 150 May 30-31 2350-0445 1650-2145 May 30 58 96 Comet LINEAR 2014 JL25 150 May 30-31 2340-0445 1650-2145 May 30 47 4 2014 JL25 2013 WF108 150 May 30-31 2350-0445 1650-2145 May 30 86 0 2013 WF108 Probably too distant to detect 2014 JL15 156-157 Jun 05-06 2255-0120 1555-1820 Jun 05 27 25 2014 JL25 Start times refer to the beginning of transmit authorization. ARECIBO TRACKS 2011 JR13 UT UT PDT Duration Round-trip Date TX Window TX Window hh:mm time (sec) May 18 0603-0809 2303-0109 2:06 66 May 19 0552-0839 2252-0139 2:47 57 May 20 0629-0833 2229-0133 2:04 52 CANCELLED 2013 WF108 ...Not currently scheduled at Arecibo...detectable on May 18-21... Comet 209P/LINEAR (2004 CB) May 23 2147-2317 1447-1617 1:30 76 May 24 2124-2346 1424-1646 2:22 70 May 25 2115-2359 1415-1659 2:44 64 May 26 2119-0001 1419-1701 2:42 60 May 27 2139-2346 1439-1646 2:07 57 2014 JL25 This will probably be observed during a survey track schedued on June 2; no other dates scheduled
Uncertainties
2011 JR13 From Jon Giorgini, 2014 May 19: New optical was reported for active case 2011 JR13. Folding in the 148 reported optical measurements with the delay measurements from Arecibo and DSS-14, orbit solution #32 was estimated. Formal 3-sigma X-band uncertainties for s32 at 4 hour intervals when above 15 degrees elevation at Goldstone: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig >..... Elevation Cut-off Requested .....< 2014-May-20 08:00 m 1.029 1.58 0.000011 2014-May-20 12:00 Nm 1.044 1.73 0.000014 2014-May-20 16:00 *m 1.056 1.87 0.000017 >..... Elevation Cut-off Requested .....< 2014-May-21 08:00 1.079 2.40 0.000031 2014-May-21 12:00 Nm 1.077 2.45 0.000035 2014-May-21 16:00 *m 1.073 2.48 0.000039 >..... Elevation Cut-off Requested .....< 2014-May-22 04:00 A 1.044 2.62 0.000051 2014-May-22 08:00 1.031 2.62 0.000056 2014-May-22 12:00 Nm 1.016 2.57 0.000060 2014-May-22 16:00 *m 1.000 2.52 0.000064 2014-May-22 20:00 *m 0.983 2.49 0.000068 2014-May-23 00:00 * 0.965 2.49 0.000073 - - - - - - - - - - JPL/Horizons solution 24, #obs: 138 (2011-2014) Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-18 00:00 * 274.28029 3.13536 0.06947990439992 2.532 2.48 9.01 0.000324 2014-May-19 00:00 * 277.59426 13.69928 0.05981856947098 3.016 3.55 12.89 0.000313 2014-May-20 00:00 * 282.45046 27.47748 0.05314204467419 3.436 4.61 16.77 0.000335 2014-May-21 00:00 * 290.12968 43.51618 0.05062744994119 3.561 4.93 17.92 0.000408 2014-May-22 00:00 * 303.39283 58.74278 0.05286066296907 3.299 4.16 15.11 0.000502 2014-May-23 00:00 * 327.18138 69.37880 0.05930290857596 2.848 3.02 10.96 0.000579 2014-May-24 00:00 * 0.79331 73.08674 0.06878228816606 2.418 2.13 7.75 0.000630 2014-May-25 00:00 * 27.89920 71.52585 0.08023472374050 2.071 1.57 5.72 0.000665 2014-May-26 00:00 *m 43.35347 68.34389 0.09294263754235 1.804 1.24 4.49 0.000690 2014-May-27 00:00 *m 52.10434 65.20576 0.10646946873989 1.598 1.03 3.74 0.000711 2014-May-28 00:00 *m 57.49499 62.48536 0.12055462765177 1.435 0.90 3.27 0.000730 2014-May-29 00:00 *m 61.08670 60.19268 0.13504073152676 1.304 0.82 2.99 0.000749 2014-May-30 00:00 *m 63.62961 58.26099 0.14983103283181 1.197 0.77 2.81 0.000767 2014-May-31 00:00 *m 65.51499 56.61896 0.16486537176817 1.109 0.75 2.72 0.000787 - - - - - - - - - - JPL/Horizons solution 23, # obs: 133 (2011-2013) Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-18 00:00 * 274.27904 3.13498 0.06947994683661 47.699 42.18 153.30 0.001037 2014-May-19 00:00 * 277.59275 13.69885 0.05981845413741 55.991 59.38 215.80 0.000884 2014-May-20 00:00 * 282.44860 27.47709 0.05314172069342 62.515 74.11 269.35 0.003220 2014-May-21 00:00 * 290.12731 43.51604 0.05062689615748 63.203 73.07 265.59 0.005880 2014-May-22 00:00 * 303.38985 58.74311 0.05285991776864 57.146 53.51 194.47 0.008145 2014-May-23 00:00 * 327.17844 69.37969 0.05930204321386 48.485 31.24 113.53 0.009608 2014-May-24 00:00 * 0.79256 73.08787 0.06878135978926 40.721 16.81 61.08 0.010406 2014-May-25 00:00 * 27.90026 71.52678 0.08023376349317 34.653 9.56 34.74 0.010828 2014-May-26 00:00 *m 43.35490 68.34457 0.09294165919152 30.004 6.36 23.13 0.011076 2014-May-27 00:00 *m 52.10569 65.20626 0.10646847728900 26.391 5.14 18.67 0.011253 2014-May-28 00:00 *m 57.49619 62.48574 0.12055362411101 23.524 4.83 17.55 0.011409 2014-May-29 00:00 *m 61.08776 60.19299 0.13503971515868 21.202 4.95 17.98 0.011566 2014-May-30 00:00 *m 63.63055 58.26124 0.14983000216698 19.286 5.26 19.13 0.011734 2014-May-31 00:00 *m 65.51582 56.61918 0.16486432505693 17.681 5.67 20.61 0.011917 2013 WF108 From Jon Giorgini, 2014 May 28: Using 75 angular measurements (2013-Nov-7 to 2014-May-27) and five delay and five Doppler, 2013 WF108 was updated to orbit solution #34. Formal 3-sigma X-band uncertainties for s34: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-28 00:00 0.402 0.62 0.000012 2014-May-29 00:00 0.383 0.61 0.000018 2014-May-30 00:00 0.371 0.60 0.000024 - - - - - - - - - - From Jon Giorgini, 2014 May 24: The most recent 2013 WF108 s28 orbit is now public in Horizons for external use. Formal 3-sigma X-band uncertainties: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-21 00:00 14.947 3.75 0.000029 2014-May-22 00:00 18.195 3.25 0.000006 2014-May-23 00:00 21.119 1.93 0.000010 2014-May-24 00:00 21.983 1.64 0.000009 2014-May-25 00:00 20.255 2.84 0.000035 2014-May-26 00:00 17.438 3.34 0.000075 2014-May-27 00:00 14.792 3.46 0.000117 - - - - - - - - - - From Jon Giorgini, 2014 May 22: Here are the uncertainties for 2013 WF108 s24, given last night's radar astrometry. Pointing uncertainty was cut substantially but is still up there. Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-21 00:00 67.267 2.20 8.01 0.000061 2014-May-22 00:00 81.802 1.10 3.99 0.000006 2014-May-23 00:00 94.847 2.86 10.38 0.000069 2014-May-24 00:00 98.607 5.27 19.16 0.000222 2014-May-25 00:00 90.722 5.93 21.54 0.000431 2014-May-26 00:00 77.986 5.49 19.96 0.000640 2014-May-27 00:00 66.054 4.96 18.01 0.000830 - - - - - - JPL/Horizons Solution 18, # obs: 44 (2013-2014) Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-20 00:00 * 89.14146 8.16134 0.04860556778960 272.421 109.90 399.42 0.104219 2014-May-21 00:00 * 92.07127 16.69753 0.04052490895742 354.345 199.43 724.82 0.099047 2014-May-22 00:00 * 96.79236 28.90244 0.03391997773637 488.099 391.92 1424.41 0.088890 * Scheduled 2014-May-23 00:00 * 105.52497 45.25878 0.02977365609849 665.038 689.03 2504.24 0.069503 * Scheduled 2014-May-24 00:00 * 125.21015 62.73050 0.02913958429378 779.530 866.86 3150.55 0.040370 * Scheduled; best day 2014-May-25 00:00 * 170.53526 72.07453 0.03221316919454 740.166 735.90 2674.59 0.010467 2014-May-26 00:00 *m 212.80632 68.26744 0.03809795801717 618.380 491.25 1785.41 0.011972 * Scheduled 2014-May-27 00:00 *m 230.52316 61.35709 0.04571403908927 499.056 300.28 1091.35 0.026086 2014-May-28 00:00 *m 238.56554 55.60817 0.05433330099562 406.279 179.08 650.87 0.034579 2014-May-29 00:00 *m 242.98437 51.21564 0.06354545476706 337.777 104.73 380.64 0.039576 2014-May-30 00:00 *m 245.74731 47.84889 0.07312454817443 287.014 58.32 211.96 0.042412 2014-May-31 00:00 *m 247.62996 45.21475 0.08294223735023 248.629 28.85 104.84 0.043872 Comet 209P/LINEAR From Jon Giorgini, 2014 May 30: 209P has been updated to s118. The first two Arecibo delays are outliers at 10-20 usec and have been deleted in this fit. The most recent Arecibo delay and all Arecibo Dopplers can be fit at this time. Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-25 00:00 0.241 0.37 0.000008 2014-May-26 00:00 0.268 0.41 0.000005 2014-May-27 00:00 0.294 0.46 0.000005 2014-May-28 00:00 0.317 0.52 0.000009 2014-May-29 00:00 0.333 0.55 0.000013 2014-May-30 00:00 0.339 0.55 0.000018 2014-May-31 00:00 0.335 0.53 0.000023 2014-Jun-01 00:00 0.324 0.49 0.000027 - - - - - - - - - - - From Jon Giorgini, 2014 May 28: A couple weeks of optical astrometry on 209P has come in and has been added to estimate orbit solution #116. Files on aardvark have been updated. Formal 3-sigma X-band uncertainties for s116: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-27 00:00 0.284 0.38 0.000007 2014-May-28 00:00 0.308 0.46 0.000010 2014-May-29 00:00 0.325 0.53 0.000015 2014-May-30 00:00 0.333 0.56 0.000019 2014-May-31 00:00 0.331 0.56 0.000024 The uncertainties for the immediately prior s114 (without the optical update) were: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-27 00:00 0.925 0.43 0.000007 2014-May-28 00:00 0.993 0.54 0.000011 2014-May-29 00:00 1.038 0.64 0.000015 2014-May-30 00:00 1.053 0.69 0.000021 2014-May-31 00:00 1.037 0.69 0.000027 Differencing the two predicts on May 30: TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL s116: 2014 MAY 30 05:50 56.0467910990 -171000.194 53.9059 -16.3002 164.375 17.341 s114: 2014 MAY 30 05:50 56.0467753175 -170999.422 53.9054 -16.3001 164.375 17.342 ------------- ----------- ... so +16 usec, -0.772 Hz, ~2". Looks like some statistically significant debiasing in s116. Could be tiny outgassing acceleration not currently being modeled but visible in radar. - - - - - - - - - - JPL/Horizons solution 92, # obs: 1061 (2003-2014) Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-18 00:00 * 143.59322 54.51810 0.12307716672881 1.292 0.72 2.63 0.001233 2014-May-19 00:00 * 144.94465 52.44244 0.11456596671611 1.366 0.82 2.97 0.001243 2014-May-20 00:00 * 146.34046 50.02213 0.10622691285908 1.443 0.93 3.38 0.001255 2014-May-21 00:00 * 147.78514 47.17879 0.09811199751717 1.524 1.06 3.84 0.001269 2014-May-22 00:00 * 149.28359 43.81450 0.09028940494088 1.609 1.21 4.38 0.001283 2014-May-23 00:00 * 150.84106 39.80924 0.08284934168401 1.699 1.37 4.99 0.001297 2014-May-24 00:00 * 152.46315 35.02184 0.07591134549977 1.804 1.57 5.70 0.001309 2014-May-25 00:00 * 154.15569 29.29989 0.06963221974758 1.940 1.80 6.55 0.001316 2014-May-26 00:00 *m 155.92477 22.50766 0.06421164847776 2.141 2.12 7.69 0.001312 2014-May-27 00:00 *m 157.77659 14.58239 0.05988877619187 2.445 2.56 9.31 0.001292 2014-May-28 00:00 *m 159.71741 5.61702 0.05691918692010 2.862 3.16 11.49 0.001247 2014-May-29 00:00 *m 161.75334 -4.06830 0.05552464282462 3.336 3.81 13.86 0.001175 2014-May-30 00:00 *m 163.89024 -13.94256 0.05582674087486 3.752 4.30 15.64 0.001079 2014-May-31 00:00 *m 166.13347 -23.40886 0.05780159087791 4.009 4.46 16.21 0.000969 2014 JL25 From Jon Giorgini, 2014 May 30: Another update for 2014 JL25, now with the Goldstone (and WISE) astrometry. Based on 41 optical measurements (May 8-24) and 2 Dopplers, orbit solution #11 was computed. Formal 3-sigma uncertainties for s11 (S/X-band): Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-30 00:00 25.828 4.32 15.71 0.032986 2014-May-31 00:00 39.659 13.54 49.23 0.032679 2014-Jun-01 00:00 61.081 30.21 109.80 0.031917 2014-Jun-02 00:00 93.961 60.14 218.58 0.030332 2014-Jun-03 00:00 141.786 110.72 402.40 0.027307 2014-Jun-04 00:00 201.443 181.79 660.71 0.022048 2014-Jun-05 00:00 253.412 245.74 893.12 0.014212 - - - - - - - - - - From Jon Giorgini, 2014 May 27: Based on 39 angular measurements (May 4-24), 2014 JL25 orbit solution #6 was estimated. Formal 3-sigma X-band uncertainties: Date__(UT)__HR:MN POS_3sigma DOP_X_3sig RT_delay_3sig 2014-May-27 00:00 7.267 1991.80 0.210604 2014-May-28 00:00 11.320 1965.91 0.191132 2014-May-29 00:00 17.366 1927.80 0.172022 2014-May-30 00:00 26.499 1871.58 0.153422 2014-May-31 00:00 40.496 1787.80 0.135541 2014-Jun-01 00:00 62.153 1661.68 0.118674 2014-Jun-02 00:00 95.386 1473.57 0.103238 2014-Jun-03 00:00 143.731 1214.75 0.089841 2014-Jun-04 00:00 204.030 956.60 0.079469 2014-Jun-05 00:00 256.495 910.91 0.073841 2014-Jun-06 00:00 273.369 1088.67 0.074941 2014-Jun-07 00:00 251.856 1306.27 0.082875 - - - - - JPL/Horizons solution 4, #obs: 31 (5 days) Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2014-May-27 00:00 *m 153.40443 45.84854 0.07455494789848 1124.874 4499.63 16353.69 2.305921 * Scheduled; weak 2014-May-28 00:00 *m 151.92989 43.87423 0.06761968008876 1498.835 4375.64 15903.05 2.245393 * Scheduled; weak 2014-May-29 00:00 *m 150.23393 41.43139 0.06079440481870 2023.650 4205.47 15284.59 2.188533 * Scheduled; detectable 2014-May-30 00:00 *m 148.26941 38.34997 0.05412932780746 2774.943 3990.71 14504.05 2.130542 2014-May-31 00:00 *m 145.97654 34.38156 0.04770002107258 3870.667 3799.65 13809.64 2.062656 * Scheduled; detectable 2014-Jun-01 00:00 *m 143.27926 29.16425 0.04162390650016 5488.126 3953.06 14367.21 1.969277 2014-Jun-02 00:00 *m 140.08099 22.19122 0.03608728064321 7859.469 5258.34 19111.20 1.823609 2014-Jun-03 00:00 *m 136.26027 12.84425 0.03138347304542 11155.961 8504.20 30908.14 1.584362 2014-Jun-04 00:00 *m 131.66836 0.66687 0.02794125401652 15070.981 13457.94 48912.26 1.208879 2014-Jun-05 00:00 *m 126.13327 -13.92857 0.02626416252466 18223.861 17933.53 65178.58 0.737488 2014-Jun-06 00:00 *m 119.47961 -29.06156 0.02668722503479 18818.760 18758.58 68177.19 0.598007 * Scheduled; highest SNR 2014-Jun-07 00:00 *m 111.57869 -42.30130 0.02911695369896 16823.362 15936.15 57919.19 1.030075 2014-Jun-08 00:00 *m 102.43897 -52.36341 0.03311086837214 13820.459 12221.35 44417.93 1.500935 2014-Jun-09 00:00 *m 92.31338 -59.32269 0.03817655932421 11026.887 9332.03 33916.85 1.882491 2014-Jun-10 00:00 *m 81.73668 -63.83120 0.04393968126543 8816.738 7489.75 27221.15 2.185612 2014-Jun-11 00:00 * 71.39893 -66.58667 0.05015481664725 7158.619 6405.12 23279.10 2.435343 2014-Jun-12 00:00 * 61.90167 -68.16193 0.05666765928215 5925.648 5779.69 21006.02 2.650945 2014-Jun-13 00:00 * 53.58298 -68.97956 0.06338063999015 5000.597 5414.10 19677.29 2.844993 2014-Jun-14 00:00 * 46.51275 -69.32958 0.07023053677572 4295.780 5193.16 18874.29 3.025381 2014-Jun-15 00:00 * 40.59096 -69.40039 0.07717513203543 3749.530 5053.83 18367.90 3.197056 ********************************************************************************************** Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 2011 JR13 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2014-May-18 00:00 274.26722 3.15666 0.06944967546341 15.58 135.0146 /L 22.1/ 86.8 2014-May-19 00:00 277.57991 13.72905 0.05979297441914 15.46 126.9340 /L 34.5/ 77.9 2014-May-20 00:00 282.43544 27.51706 0.05312376609998 15.52 115.1239 /L 48.4/ 67.5 2014-May-21 00:00 290.11653 43.56278 0.05061912500094 15.86 100.2451 /L 61.1/ 56.3 2014-May-22 00:00 303.39092 58.78916 0.05286290163081 16.50 84.8749 /L 69.4/ 44.9 2014-May-23 00:00 327.21680 69.41685 0.05931383346231 17.34 71.7078 /L 71.9/ 33.9 2014-May-24 00:00 0.87551 73.10919 0.06879925502330 18.22 61.6448 /L 69.4/ 23.8 2014-May-25 00:00 27.97799 71.53542 0.08025560752783 19. 54.2451 /L 64.0/ 15.1 2014-May-26 00:00 43.41258 68.34774 0.09296602237558 20. 48.7706 /L 57.4/ 8.2 2014-May-27 00:00 52.14885 65.20747 0.10649445574561 20. 44.6188 /L 50.8/ 3.4 2014-May-28 00:00 57.52999 62.48632 0.12058064180719 21. 41.3746 /L 45.4/ 0.7 2014-May-29 00:00 61.11532 60.19341 0.13506739444523 21. 38.7649 /L 42.1/ 0.1 2014-May-30 00:00 63.65375 58.26169 0.14985808684120 22. 36.6102 /L 41.5/ 1.7 2014-May-31 00:00 65.53584 56.61972 0.16489263523284 22. 34.7910 /L 44.0/ 5.1 2013 WF108 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2014-May-20 00:00 89.16800 8.18313 0.04864064290269 21. 33.5295 /T 140.1/ 67.5 2014-May-21 00:00 92.10258 16.71568 0.04056306757903 21. 32.7655 /T 129.5/ 56.3 2014-May-22 00:00 96.82914 28.90892 0.03396115998805 20. 35.5499 /T 118.5/ 44.9 * 2014-May-23 00:00 105.56407 45.24043 0.02981586219300 18. 44.9167 /T 108.0/ 33.9 * 2014-May-24 00:00 125.21822 62.68301 0.02917821864999 17.05 60.0709 /T 100.6/ 23.8 * 2014-May-25 00:00 170.38509 72.03751 0.03224435009027 16.31 75.6984 /T 98.3/ 15.1 2014-May-26 00:00 212.64795 68.27347 0.03812138519357 16.10 87.9893 /T 100.0/ 8.2 * 2014-May-27 00:00 230.42169 61.37820 0.04573132334903 16.16 96.6852 /T 103.6/ 3.4 * 2014-May-28 00:00 238.49508 55.63178 0.05434613615448 16.33 102.7749 /T 107.2/ 0.7 2014-May-29 00:00 242.93106 51.23824 0.06355512302535 16.53 107.1501 /T 110.0/ 0.1 2014-May-30 00:00 245.70455 47.86961 0.07313194961555 16.73 110.4014 /T 111.5/ 1.7 2014-May-31 00:00 247.59425 45.23351 0.08294800072869 16.93 112.8969 /T 111.4/ 5.1 Comet 209P/LINEAR Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta T-mag N-mag S-O-T /r T-O-M/Illu% 2014-May-20 00:00 146.32771 50.01771 0.10626590131785 11.36 17.89 74.6412 /T 140.7/ 67.5 2014-May-21 00:00 147.77189 47.17519 0.09815126380169 11.21 17.71 75.4364 /T 142.1/ 56.3 2014-May-22 00:00 149.26979 43.81212 0.09032886776512 11.05 17.52 76.4858 /T 140.8/ 44.9 2014-May-23 00:00 150.82667 39.80862 0.08288885234574 10.88 17.31 77.8605 /T 137.1/ 33.9 2014-May-24 00:00 152.44810 35.02373 0.07595064960780 10.71 17.09 79.6474 /T 131.6/ 23.8 2014-May-25 00:00 154.13994 29.30523 0.06967090473560 10.55 16.85 81.9444 /T 124.9/ 15.1 2014-May-26 00:00 155.90825 22.51758 0.06424908364344 10.40 16.60 84.8426 /T 117.5/ 8.2 2014-May-27 00:00 157.75924 14.59790 0.05992407233054 10.27 16.36 88.3869 /T 109.6/ 3.4 2014-May-28 00:00 159.69915 5.63870 0.05695123204032 10.18 16.14 92.5175 /T 101.5/ 0.7 2014-May-29 00:00 161.73411 -4.04086 0.05555227448330 10.15 15.97 97.0189 /T 93.8/ 0.1 2014-May-30 00:00 163.86996 -13.91090 0.05584903568340 10.19 15.85 101.5392 /T 86.8/ 1.7 2014-May-31 00:00 166.11207 -23.37524 0.05781811712615 10.30 15.81 105.7056 /T 80.9/ 5.1 2014 JL25 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2014-May-20 00:00 159.87901 53.20349 0.12348532536861 21.31 81.7030 /T 133.3/ 67.5 2014-May-21 00:00 159.22459 52.54359 0.11638561303738 21.23 80.8542 /T 135.1/ 56.3 2014-May-22 00:00 158.49985 51.79499 0.10927806451499 21.15 79.9691 /T 133.4/ 44.9 2014-May-23 00:00 157.69347 50.93841 0.10217003749395 21.06 79.0402 /T 128.7/ 33.9 2014-May-24 00:00 156.79194 49.94880 0.09507038630690 20.97 78.0588 /T 121.7/ 23.8 2014-May-25 00:00 155.77894 48.79305 0.08799006394996 20.87 77.0136 /T 113.1/ 15.1 2014-May-26 00:00 154.63458 47.42670 0.08094302780140 20.76 75.8905 /T 103.5/ 8.2 2014-May-27 00:00 153.33437 45.78895 0.07394763214593 20.64 74.6720 /T 93.3/ 3.4 * Weak 2014-May-28 00:00 151.84793 43.79507 0.06702882335253 20.52 73.3365 /T 82.5/ 0.7 * Weak 2014-May-29 00:00 150.13720 41.32465 0.06022169344926 20.39 71.8582 /T 71.3/ 0.1 * Probably detectable 2014-May-30 00:00 148.15417 38.20361 0.05357738249092 20.24 70.2098 /T 59.7/ 1.7 2014-May-31 00:00 145.83790 34.17727 0.04717308145368 20.10 68.3710 /T 47.4/ 5.1 * Detectable 2014-Jun-01 00:00 143.11082 28.87439 0.04112905017476 19.94 66.3562 /T 34.2/ 10.1 2014-Jun-02 00:00 139.87433 21.77629 0.03563647105170 19.79 64.2864 /T 19.7/ 16.6 2014-Jun-03 00:00 136.00445 12.25737 0.03099631712771 19.62 62.5489 /T 3.829/ 24.2 2014-Jun-04 00:00 131.34954 -0.11832 0.02764603406441 19.43 62.0040 /T 15.6/ 32.7 2014-Jun-05 00:00 125.73495 -14.85921 0.02608994037287 19.19 63.7801 /T 35.8/ 41.9 2014-Jun-06 00:00 118.98449 -29.98964 0.02664427597623 18.96 68.0981 /T 55.6/ 51.5 * Strong 2014-Jun-07 00:00 110.97362 -43.08579 0.02918684684964 18.83 73.6555 /T 72.2/ 61.2 Too far south for Goldstone 2014-Jun-08 00:00 101.72378 -52.95369 0.03326108281563 18.83 78.9903 /T 84.3/ 70.6 2014-Jun-09 00:00 91.51009 -59.73465 0.03837759421219 18.93 83.4839 /T 91.8/ 79.5 2014-Jun-10 00:00 80.89030 -64.10235 0.04417043430494 19.07 87.1143 /T 95.4/ 87.4
Setups
We do not know what to expect as the bandwidth for 2011 JR13, so we'll start with our standard setup. CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 4000 Hz TXoffset +500 Hz Sampling interval: 2500 x 0.1 usec FFT for PFS files: 4000 for 1 Hz resolution Ranging setups: --------------------------------------------------------------------------- 10-usec baud 10 usec code 127 PRP 1270 usec FFT 128 ncoh 1 bandwidth 787 Hz resolution 6.15 Hz TXOFF +100Hz (echo in bin 81) --------------------------------------------------------------------------- 11-usec baud 11 usec code 127 PRP 1397 usec FFT 128 ncoh 1 bandwidth 716 Hz resolution 5.6 Hz TXOFF +100 Hz (echo in bin 82) --------------------------------------- 1 usec baud 1.0 usec code 255 ncoh 4 FFT 128 bandwidth 980 Hz resolution 7.66 Hz TXoff +100 Hz, echo is in bin 78
Instructions
NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2011jr13/raw/
2011 JR13 POINTING:
OSOD and predicts will be on aardvark: ...not available yet... POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD ... to be added ... 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
2011 JR13 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 183-601 | 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/2011JR13/2011JR13_.planning.html
Asteroid Radar Astronomy