Goldstone Radar Observations Planning: 1999 JV6
85990 1999 JV6 1999 JV6 was discovered in May 1999 by LINEAR. 1999 JV6 has been observed using photometry, spectroscopy, IR radiometry, and radar during previous apparitions, so many of its physical properties are known. Binzel et al. (2001) found that this is an Xk-class object. Thermal infrared observations using the WISE spacecraft by Mainzer et al. (2011) and the Spitzer Space Telescope by Mueller et al. (2011) give a diameter of 0.45 km. Warner et al. (2014, 2015) estimate a rotation period of 6.54 h and a large lightcurve amplitude of 0.9 mag that indicates a very elongated shape. Radar imaging at Arecibo in January 2015 confirmed the elongation suggested by the lightcurves. The radar data from Goldstone and Arecibo from January of 2016 reveal an obvious concavity and strongly suggest that 1999 JV6 is a contact binary. A. Rozek and S. Lowry from University of Kent, UK are working on the 3D shape model. 1999 JV6 will be more than twice as far in 2017 apparition than in 2016 apparition, 0.069 au vs 0.032 au. This will reduce the radar SNRs by more than a factor of 20. In 2017 this object will approach from the south and enter the beam at Goldstone on January 3, ten days before it moves into the declination window at Arecibo. We will observe it at southern declinations to take advantage of the sky positions to lengthen the arc of the combined Goldstone + Arecibo observations. We expect that 1999 JV6 will be CW-only target at Goldstone, and coarse-imaging target at Arecibo. The Minor Planet Center has classified 1999 JV6 as a "Potentially Hazardous Asteroid."
Orbital and Physical Characteristics Provisional Designation 1999 JV6 Asteroid number 85990 Discoverer LINEAR Discovery date 1999 May 13 orbit type Apollo Close approach date 2017 January 7 Close approach dist. 0.069 au Close approach dist. 26.8 lunar distances semimajor axis 1.008 au eccentricity 0.311 inclination 5.3 deg perihelion distance 0.694 au aphelion distance 1.321 au Tisserand parameter 5.999 absolute magnitude (H) 20.1 diameter 0.45 km 2,3 optical albedo 0.095 3,4 rotation period 6.54 h 5,6,7 lightcurve amplitude 0.9 mag 5,6,7 pole direction unknown spectral class Xk 1 References: 1 Binzel et al. 2001 2 Mainzer et al. 2011 3 Mueller et al. 2011 4 Thomas et al. 2011 5 Warner et al 2015 6 Binzel et al. 2004 7.Warner et al. 2014 Last update: 2016 November 28
1999 JV6 http://www.minorplanetcenter.net/mpec/J99/J99J52.html
1999 JV6 Goldstone SNRs Assumptions: D = 0.45 km, P = 6.54 h, OC radar albedo = 0.1 w start date window RA, dec dist runs SNR/day SNR/run 01 2017 Jan 3 00:06-02:07 2, -33 0.074 102 17 2 01 2017 Jan 3 23:46-03:02 7, -31 0.072 122 22 2 01 2017 Jan 4 23:34-03:48 13, -28 0.070 141 27 2 01 2017 Jan 5 23:26-04:30 18, -25 0.069 158 31 3 01 2017 Jan 6 23:20-05:07 23, -22 0.069 174 35 3 01 2017 Jan 7 23:16-05:41 27, -18 0.069 187 37 3 01 2017 Jan 8 23:14-06:11 32, -15 0.070 196 37 3 02 2017 Jan 9 23:12-06:38 36, -11 0.072 203 36 3 02 2017 Jan 10 23:11-07:02 40, -8 0.074 207 34 3 02 2017 Jan 11 23:10-07:24 44, -5 0.076 208 30 2 02 2017 Jan 12 23:09-07:43 47, -2 0.079 207 27 2 02 2017 Jan 13 23:09-08:00 50, +1 0.083 204 23 2 02 2017 Jan 14 23:09-08:14 53, +4 0.087 200 20 2 02 2017 Jan 15 23:09-08:27 55, +6 0.091 195 16 1 03 2017 Jan 16 23:08-08:38 58, +8 0.096 190 14 1 03 2017 Jan 17 23:08-08:48 60, +10 0.100 184 11 1 03 2017 Jan 18 23:08-08:57 62, +11 0.105 178 10 1 Goldstone SNRs assume Ptx = 440 kW. Arecibo SNRs start date window RA, dec dist runs SNR/day SNR/run 2017 Jan 13 23:37-00:47 50, +1 0.082 25 100 22 2017 Jan 14 23:28-01:11 52, +3 0.086 35 120 23 2017 Jan 15 23:24-01:27 55, +6 0.091 40 120 20 2017 Jan 16 23:23-01:39 58, +8 0.095 42 100 17 2017 Jan 17 23:24-01:49 60, +10 0.100 43 89 14 2017 Jan 18 23:25-01:57 62, +11 0.105 43 76 12 Assumptions: Ptx = 500 kW, Tsys = 23 K
Track Assignments
DOY BOA BOT EOT EOA 006 2335 0105 0505 0535 DSS-14 GSSR 99JV6 007 2355 0125 0515 0545 DSS-14 GSSR 99JV6 009 0020 0150 0505 0535 DSS-14 GSSR 99JV6 009 2350 0120 0635 0705 DSS-14 GSSR 99JV6 012 0135 0305 0720 0750 DSS-14 GSSR 99JV6 Goldstone Schedule: UT Target UT PST Round-trip Asteroid OBSERVER DOY Date TX Window TX Window time (sec) SNR/RTT 007 Jan 7 1999 JV6 0005-0505 1605-2105 Jan 6 68.9 3 SPN 008 Jan 8 1999 JV6 0025-0515 1625-2115 Jan 7 69.2 3 MB 009 Jan 9 1999 JV6 0040-0505 1640-2105 Jan 8 70.0 3 SPN 010 Jan 10 1999 JV6 0020-0635 1620-2235 Jan 9 71.6 3 MB 012 Jan 12 1999 JV6 0205-0720 1805-2320 Jan 11 76.2 2 LAMB NOTE: The TX times above assume that we can start transmitting 30 min into pre-cal Arecibo Schedule: ... not available yet ...
Uncertainties
1999 JV6 1999 JV6 exhibits non-gravitational perturbations in its motion, presumably due to the Yarkovsky effect, so formal uncertainties are no longer available. Given the past radar apparitions, the pointing won't be a problem, and the Doppler uncertainties are small. If we see a correction to the ephemeris, it's likely it will be most evident in time delay. ********************************************************************************************** Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 1999 JV6 Date__(UT)__HR:MN R.A._(a-appar)_DEC. APmag delta S-O-T /r T-O-M/Illu% ********************************************************************************************* 2017-Jan-01 00:00 *m 351.71498 -36.95561 19.08 0.08040019848233 60.9057 /T 39.8/ 7.0 2017-Jan-02 00:00 *m 356.70191 -35.27876 18.79 0.07719289198307 64.3197 /T 35.1/ 13.1 2017-Jan-03 00:00 *m 1.82391 -33.25367 18.51 0.07445342649358 68.0416 /T 31.4/ 21.1 2017-Jan-04 00:00 *m 7.01027 -30.87415 18.24 0.07222981000574 72.0470 /T 28.8/ 30.5 2017-Jan-05 00:00 *m 12.18457 -28.15618 17.98 0.07056654049415 76.2917 /T 27.8/ 41.0 2017-Jan-06 00:00 *m 17.27144 -25.14064 17.76 0.06950055912968 80.7102 /T 28.5/ 52.2 2017-Jan-07 00:00 *m 22.20321 -21.89200 17.56 0.06905721808403 85.2191 /T 31.1/ 63.6 2017-Jan-08 00:00 *m 26.92482 -18.49234 17.40 0.06924713818270 89.7240 /T 35.6/ 74.4 2017-Jan-09 00:00 *m 31.39645 -15.03172 17.27 0.07006477282136 94.1287 /T 41.8/ 83.9 2017-Jan-10 00:00 *m 35.59375 -11.59747 17.17 0.07148908522919 98.3460 /T 49.3/ 91.7 2017-Jan-11 00:00 *m 39.50623 -8.26508 17.11 0.07348614090177 102.3047 /T 57.9/ 97.0 2017-Jan-12 00:00 * 43.13463 -5.09259 17.07 0.07601290780565 105.9550 /T 67.1/ 99.6 2017-Jan-13 00:00 * 46.48799 -2.11890 17.06 0.07902136796845 109.2683 /T 76.9/ 99.5 2017-Jan-14 00:00 * 49.58091 0.63474 17.07 0.08246219031429 112.2350 /T 86.9/ 96.7 2017-Jan-15 00:00 * 52.43127 3.16148 17.10 0.08628754074642 114.8605 /T 97.0/ 91.8 2017-Jan-16 00:00 * 55.05845 5.46502 17.14 0.09045292880072 117.1606 /T 107.0/ 85.1 2017-Jan-17 00:00 * 57.48216 7.55599 17.20 0.09491820560480 119.1575 /T 117.0/ 77.1 2017-Jan-18 00:00 * 59.72151 9.44910 17.26 0.09964792088834 120.8770 /T 126.9/ 68.3 2017-Jan-19 00:00 * 61.79461 11.16091 17.33 0.10461125281385 122.3457 /T 136.7/ 59.0 2017-Jan-20 00:00 * 63.71820 12.70843 17.41 0.10978168714406 123.5898 /T 146.5/ 49.6 2017-Jan-21 00:00 * 65.50761 14.10814 17.49 0.11513657327660 124.6338 /T 156.4/ 40.3 2017-Jan-22 00:00 * 67.17673 15.37548 17.57 0.12065664039007 125.5007 /T 166.3/ 31.4 2017-Jan-23 00:00 * 68.73804 16.52461 17.65 0.12632552309894 126.2110 /T 176.4/ 23.1 2017-Jan-24 00:00 * 70.20272 17.56827 17.74 0.13212932274501 126.7832 /T 173.2/ 15.6 2017-Jan-25 00:00 * 71.58078 18.51786 17.83 0.13805621574994 127.2337 /T 162.7/ 9.3 2017-Jan-26 00:00 * 72.88114 19.38346 17.92 0.14409611193310 127.5769 /T 151.7/ 4.5 2017-Jan-27 00:00 *m 74.11173 20.17400 18.00 0.15024036130260 127.8255 /T 140.5/ 1.3 2017-Jan-28 00:00 *m 75.27963 20.89731 18.09 0.15648150595950 127.9908 /T 128.9/ 0.0 2017-Jan-29 00:00 *m 76.39114 21.56031 18.18 0.16281307322334 128.0824 /T 117.0/ 0.9 2017-Jan-30 00:00 *m 77.45185 22.16905 18.26 0.16922940603832 128.1089 /T 104.7/ 4.1 2017-Jan-31 00:00 *m 78.46676 22.72888 18.35 0.17572552663403 128.0779 /T 92.2/ 9.5
Setups
For 1999 JV6, the rotation period and estimated diameter suggest that the bandwidth will be about 7 Hz. This object is highly elongated, so we expect to see significant bandwith variations as it spins. We're going to start with a standard CW setup, which should work fine: CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 5000 Hz TXoffset +500 Hz Sampling interval: 2500 x 0.1 usec FFT for PFS files: 10000 for 0.5 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 +100 Hz (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) ------------------------------------------------------------------------- 1-usec baud 1 usec code 255 FFT 512 ncoh 16 bandwidth 245 Hz resolution 0.48 Hz TXOFF +50 Hz ---------------------------------------------------------------------
Instructions
NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/1999jv6/raw/
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 ... 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
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/1999JV6/1999JV6_planning.2017.html
Asteroid Radar Astronomy