Goldstone Radar Images of 2015 FW117
Goldstone Radar Observations Planning: 2015 FW117
Goldstone range-Doppler images of 2015 FW117 obtained on 2015 April 01. Resolution is 3.75 m x 0.05 Hz. Range increases towards the bottom and Doppler frequency increases to the right. Time increases from left to right and then top to bottom. The images span an interval of about 20 minutes and show very little rotation of this object. The round-trip time was about 10 seconds.
This is a planning page for asteroid 2015 FW117 in April 2015. 2015 FW117 2015 FW117 was discovered on 2015 Mar 24 by the Catalina Sky Survey. It has an absolute magnitude of 22.8 suggesting a diameter of roughly 90 m, but otherwise its physical properties are unknown. The asteroid is expected to be an excellent radar target with an approach distance of within 0.01 AU of Earth on 2015 Apr 01. We expect to obtain radar echo spectra and range-Doppler images of this object at Goldstone (X-band, 3.5 cm wavelength). The object will be brighter than 15th magnitude and have a solar elongation of ~150 degrees on 2015 Apr 01.
Orbital and Physical Characteristics
Provisional Designation 2015 FW117
Asteroid number not numbered
Discoverer Catalina Sky Survey
Discovery date 2015 Mar 24
orbit type Aten
Close approach dist. 0.009 au
Close approach dist. 3.5 lunar distances
Close approach date 2015 Apr 01
semimajor axis 0.859 au
eccentricity 0.381
inclination 32.3 deg
perihelion distance 0.531 au
aphelion distance 1.187 au
Tisserand parameter 6.693 Asteroidal
absolute magnitude (H) 22.8
diameter 0.09 km +/- a factor of two
optical albedo unknown
rotation period ~1.2 h T. Lister, pers. comm.
lightcurve amplitude 0.8 mag T. Lister, pers. comm.
pole direction unknown
spectral class unknown
Last update: 2015 Apr 02
2015 FW117 2015 FW117 http://www.minorplanetcenter.net/mpec/K15/K15FB6.html
SNR Calculations
2015 FW117 GOLDSTONE SNRS Assumptions: D = 0.09 km, P = 0.5 hr, OC albedo = 0.1 start date window RA, dec dist runs SNR/day SNR/run 2015 Mar 30 05:53-15:14 230, +8 0.026 617 67 3 2015 Mar 31 05:57-13:57 223, -4 0.016 817 350 13 2015 Apr 01 07:41-08:38 204, -34 0.010 248 740 48 Goldstone SNRs assume Ptx = 450 kW, Tsys = 18 K, Gain = 0.94 K/Jy ARECIBO SNRS start date window RA, dec dist runs SNR/day SNR/run 2015 Mar 26 06:38-09:23 237, +20 0.069 70 21 3 2015 Mar 27 06:31-09:16 236, +19 0.058 78 38 5 2015 Mar 28 06:24-09:07 235, +17 0.048 101 87 9 2015 Mar 29 06:16-08:54 233, +14 0.037 124 220 21 2015 Mar 30 06:08-08:30 231, +9 0.027 151 720 61 2015 Mar 31 06:41-06:58 225, -1 0.018 29 840 157 Assumptions: Ptx = 900 kW, Tsys = 23 K, Gain = 10 K/Jy
Track Assignments
DOY BOA BOT EOT EOA 091 0610 0740 0840 0910 DSS-14 GSSR AST 2015 FW117 Transmit Authorization Times: 091 APR-01-2015 0735Z 0840Z 14 AST 2015 FW11 Goldstone tracks: UT UT PDT Duration Round-trip DOY Date TX Window TX Window hh:mm time (sec) 091 Apr 01 0735-0840 0035-0140 Apr 01 01:05 10 2015 FW117 Arecibo tracks: Not Scheduled at Arecibo
Uncertainties
2015 FW117 JPL/Horizons solution 5, # obs: 104 (7 days): Note that values are shown at one-hour intervals: Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2015-Apr-01 05:00 m 209.06253 -27.46846 0.01044628129354 5.668 219.93 799.34 0.016530 2015-Apr-01 06:00 m 207.64711 -29.35821 0.01023631179233 6.071 203.39 739.22 0.016210 2015-Apr-01 07:00 m 206.10716 -31.30230 0.01004442585314 6.486 185.90 675.64 0.015916 2015-Apr-01 08:00 m 204.43420 -33.29150 0.00987191696169 6.918 167.47 608.67 0.015648 2015-Apr-01 09:00 m 202.62028 -35.31488 0.00971984007883 7.368 148.15 538.45 0.015410 2015-Apr-01 10:00 m 200.65786 -37.36000 0.00958897434053 7.831 128.00 465.20 0.015201 - - - - - - - - - - JPL/Horizons solution 4, # obs: 85 (2015-03-24 to 2015-03-30): Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2015-Mar-28 00:00 *m 235.30745 17.43345 0.05139555263445 0.568 1384.85 5033.17 0.241616 2015-Mar-29 00:00 *m 233.90861 15.06493 0.04077623690316 0.627 1370.81 4982.14 0.191567 2015-Mar-30 00:00 *m 231.57405 11.01722 0.03031791752559 0.706 1339.83 4869.55 0.142283 2015-Mar-31 00:00 *m 226.99842 2.78882 0.02026897645038 2.553 1250.41 4544.54 0.094948 2015-Apr-01 00:00 *m 214.59757 -19.02496 0.01172759142067 16.500 855.60 3109.62 0.054812 2015-Apr-02 00:00 *m 153.48941 -60.07036 0.00995700611195 39.616 532.07 1933.77 0.046943 2015-Apr-03 00:00 * 88.72826 -51.36903 0.01718760771313 20.175 1187.29 4315.17 0.081311 2015-Apr-04 00:00 * 75.63794 -42.53940 0.02694464900362 11.833 1320.09 4797.81 0.127355 2015-Apr-05 00:00 * 70.87501 -38.08201 0.03729080951403 8.730 1360.37 4944.19 0.176128 ********************************************************************************************** Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: 2015 FW117 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2015-Mar-25 00:00 *m 237.32648 20.84957 0.08360429625468 19.47 122.9528 /L 141.7/ 26.7 2015-Mar-26 00:00 *m 236.86596 20.05590 0.07283575021497 19.14 124.2381 /L 136.4/ 36.8 2015-Mar-27 00:00 *m 236.22665 18.97652 0.06209367161703 18.75 125.7830 /L 128.6/ 47.2 2015-Mar-28 00:00 *m 235.30745 17.43345 0.05139555263445 18.29 127.7423 /L 119.4/ 57.3 2015-Mar-29 00:00 *m 233.90861 15.06493 0.04077623690316 17.72 130.4199 /L 109.1/ 66.9 2015-Mar-30 00:00 *m 231.57405 11.01722 0.03031791752559 16.97 134.4873 /L 97.6/ 75.7 2015-Mar-31 00:00 *m 226.99842 2.78882 0.02026897645038 15.90 141.5827 /L 83.8/ 83.4 2015-Apr-01 00:00 *m 214.59757 -19.02496 0.01172759142067 14.41 151.9056 /L 64.8/ 89.8 2015-Apr-02 00:00 *m 153.48941 -60.07036 0.00995700611195 15.01 117.7641 /T 64.2/ 94.8 2015-Apr-03 00:00 * 88.72826 -51.36903 0.01718760771313 17.30 85.8663 /T 88.7/ 98.2 2015-Apr-04 00:00 * 75.63794 -42.53940 0.02694464900362 18.79 74.3252 /T 103.7/ 99.8 2015-Apr-05 00:00 * 70.87501 -38.08201 0.03729080951403 19.76 68.8057 /T 114.2/ 99.7
Setups
We don't know what to expect for the bandwidth, so we're going to start with a standard CW setup: CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 4000 Hz TXoffset +500 Hz FFT for PFS files: 4000 for 1.0 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 32 + 8 = 40) --------------------------------------------------------------------------- 11-usec baud 11 usec code 127 PRP 1397 usec FFT 64 ncoh 1 bandwidth 716 Hz resolution 5.6 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/data0/2015fw117/raw/
POINTING:
OSOD and predicts will be on aardvark: /export/data3/osod/ops/2015fw117/PUNCH.OUT.14v-14-14.s6 /export/data3/osod/ops/2015fw117/PRDX.OUT.14v-14-14.s6 /export/data3/osod/ops/2015fw117/EPH.OUT.s6 POINTING TX Offsets Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD 2015 APR 01 91 060000 207.6470 -29.3582 A 4.100 -5.400 10.2 s6 2015 APR 01 91 070000 206.1070 -31.3023 A 4.400 -5.400 10.0 s6 2015 APR 01 91 080000 204.4340 -33.2915 A 4.700 -5.500 9.9 s6 2015 APR 01 91 090000 202.6200 -35.3148 A 5.000 -5.500 9.7 s6 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
2015 FW117 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/2015FW117/2015FW117_planning.html
Asteroid Radar Astronomy
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