(285263) 1998 QE2 Goldstone Radar Observations Planning
Top: Sequence of Goldstone radar images of 1998 QE2 from June 1. The images span an interval of 4.94 hours from 04:02:57-08:59:27 UT. Each frame has a resolution of 37.5 m x 1.3 Hz and is an integration of 7 transmit-receive cycles. Range increases down and Doppler frequency increases to the right, so rotation is counterclockwise. The images clearly show rotation by the primary and orbital motion by its moon. The leading edge of the primary has a modestly angular feature that doesn't quite complete one full rotation during the sequence, suggesting that the primary's rotation period is slightly longer than 4.9 hours. However, it turns out that each frame, with seven runs, includes enough rotation of its own that it makes it appear as if there's slightly less rotation in the sequence than there actually is. Middle: The second collage consisting of two frames shows a sum of the first four runs on the left and the last four runs on the right. Each frame shows slightly more than 1/2 as much rotation as in the larger collage, and it's clear that the primary completed slightly more than one full rotation in 4.9 hours. Bottom: Sequence of images of the satellite from June 1. The images were processed at much higher Doppler resolutions than in the other two collages in order to highlight the shape of the secondary. The faint white trace near the secondary is the echo from the primary, which is greatly spread out in Doppler frequency at this resolution. In this collage, range increases up and Doppler frequency increases to the right, so rotation is clockwise (counter to the usual convention). In each image, the rapid motion by the secondary produces a modest but disernible amount of drift in time delay.
1998 QE2 was discovered LINEAR on August 19, 1998. This object was observed by the Spitzer Space Telescope by Trilling et al. (2010), who estimated that it has a diameter of 2.7 km and a dark optical albedo of 0.06. Otherwise its physical properties are unknown. 1998 QE2 will approach within 0.039 AU (15 lunar distances) on May 31, 2013, when it will be a very strong radar target at both Goldstone and Arecibo. The asteroid will approach from the south and enter Goldstone's declination range on May 28 and Arecibo's on June 5. We are planning an extensive campaign of observations at both observatories. We hope to achieve resolutions as fine as 3.75 m. During some of the observations, we hope to uplink 3.75 m chirps for reception at Arecibo. Arecibo monostatic observations should obtain resolutions as fine as 7.5 meters. This is going to be one of the best radar targets of the year. Observations are scheduled on 7 dates at Goldstone bewteen May 30-June 9. Observations are scheduled from June 6-12 at Arecibo. 1998 QE2 is already well-positioned for optical observations for telescopes in the southern hemisphere, and it will be bright all the way through the end of August of 2013, so we expect that optical observers will obtain photometry to estimate its rotation period and spectroscopy to determine the spectral class (which will constrain the composition). In early June, this object should reach magnitude 11 and be visible in small telescopes. 1998 QE2 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics orbit type Amor semimajor axis 2.427 AU eccentricity 0.568 inclination 12.8 deg perihelion distance 1.049 AU aphelion distance 3.805 AU Tisserand parameter 3.240 Not obviously cometary absolute magnitude (H) 16.4 diameter 2.75 km (Trilling et al. 2010) optical albedo 0.06 (Trilling et al. 2010) rotation period 5.28 h (Kevin Hills, pers. comm.) pole direction unknown lightcurve amplitude 0.2 mag (Kevin Hills, pers. comm.) This suggests that the shape is not highly elongated. spectral class unknown, but optically dark (Binzel, Moskovitz, and Polishook, pers. comm.) Past and future close approaches (provided by Jon Giorgini): Date (CT) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p ----------------- ----- ------- ------- ------- ------ ------ ------ ------- 1230 May 04.91065 Earth .093435 .060201 .151545 8.647 33957. 2.08E5 .000000 1305 Jun 05.53858 Vesta .051734 .051692 .068232 11.085 3769.5 59787. .000000 .... 1370 May 11.53777 Earth .076056 .066159 .092754 9.087 9546.2 1.95E5 .000000 1392 Jul 16.86363 Vesta .019528 .019288 .019769 10.895 123.54 18002. .000000 1479 Aug 25.68968 Vesta .050713 .049556 .055051 10.950 914.42 58000. .000000 1480 May 02.29986 Earth .098559 .086736 .111041 8.412 6110.9 2.35E5 .000000 1499 May 04.92556 Earth .085877 .073164 .099215 8.871 6288.9 1.53E5 .000000 1567 May 11.99166 Earth .075417 .074711 .076173 8.984 616.16 2.50E5 .000000 1703 Jun 01.63714 Earth .042431 .042345 .042517 10.582 44.68 1.01E5 .000000 1790 May 14.02038 Earth .085001 .084909 .085092 9.614 31.59 50485. .000000 1843 May 16.97496 Earth .080990 .080989 .080991 9.680 0.46 2.48E5 .000000 1975 Jun 08.05903 Earth .088438 .088423 .088454 11.242 3.26 1.19E5 .000000 2013 May 31.87451 Earth .039173 .039171 .039175 10.580 0.50 79511. .000000 2119 May 16.71792 Earth .087588 .087566 .087610 10.600 5.71 61262. .000000 2172 May 23.66274 Earth .071153 .071117 .071188 9.995 12.60 2.18E5 .000000 2221 May 27.92228 Earth .038456 .038351 .038563 10.483 54.68 1.11E5 .000000 2304 May 18.30964 Earth .092778 .090005 .095548 10.938 598.89 85726. .000000 2338 Jun 02.31158 Earth .055876 .053868 .058508 10.408 1355.1 1.31E5 .000000 2436 May 26.77704 Earth .045667 .035276 .091949 10.753 12593. 1.14E5 .000000 .... 2481 Jun 07.30869 Earth .086778 .050329 .211927 10.604 27283. 1.07E5 .000000 The predictability window (using JPL/Horizons solution 36, 2013 May 01) is from 1370-2436. During that interval, the only approach closer than the one in 2013 is in 2221 at 0.038 AU. Last update: 2013 July 17
M.P.E.C. 1998-Q19 Issued 1998 Aug. 22, 15:36 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.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html
1998 QE2
Observations:
J98Q02E* C1998 08 19.38963 22 47 07.04 +19 28 40.0 19.7 704
J98Q02E C1998 08 19.40228 22 47 05.96 +19 28 34.5 19.0 704
J98Q02E C1998 08 19.41504 22 47 04.95 +19 28 26.9 19.0 704
J98Q02E C1998 08 19.42764 22 47 03.65 +19 28 22.7 19.2 704
J98Q02E C1998 08 19.88125 22 46 27.71 +19 25 07.8 557
J98Q02E C1998 08 19.89956 22 46 26.13 +19 24 59.3 19.0 V 557
J98Q02E C1998 08 20.02451 22 46 15.64 +19 24 05.3 18.5 V 046
J98Q02E C1998 08 20.02556 22 46 15.62 +19 24 05.4 046
J98Q02E C1998 08 20.02698 22 46 15.53 +19 24 04.6 046
J98Q02E C1998 08 20.02808 22 46 15.41 +19 24 04.4 046
J98Q02E C1998 08 20.03172 22 46 15.12 +19 24 02.9 046
J98Q02E C1998 08 20.03362 22 46 14.98 +19 24 01.7 046
J98Q02E C1998 08 20.03575 22 46 14.81 +19 24 01.1 18.2 V 046
J98Q02E C1998 08 20.62706 22 45 27.20 +19 19 40.9 17.4 V 402
J98Q02E C1998 08 20.62914 22 45 26.99 +19 19 40.4 402
J98Q02E C1998 08 20.63019 22 45 26.91 +19 19 39.5 402
J98Q02E WC1998 08 20.93896 22 45 02.05 +19 17 17.4 557
J98Q02E WC1998 08 20.94163 22 45 01.76 +19 17 15.7 557
J98Q02E WC1998 08 20.94433 22 45 01.51 +19 17 15.9 18.4 V 557
J98Q02E C1998 08 22.49821 22 42 55.43 +19 04 51.4 658
J98Q02E C1998 08 22.50341 22 42 55.01 +19 04 48.7 658
J98Q02E C1998 08 22.50573 22 42 54.80 +19 04 47.8 658
J98Q02E C1998 08 22.58973 22 42 48.52 +19 04 17.6 18.3 R 426
J98Q02E C1998 08 22.59593 22 42 48.06 +19 04 14.7 18.5 R 426
J98Q02E C1998 08 22.60207 22 42 47.45 +19 04 11.8 18.7 R 426
Observer details:
046 Klet. Observers M. Tichy, Z. Moravec. Measurer M. Tichy. 0.57-m f/5.2
reflector + CCD.
402 Dynic Astronomical Observatory. Observer A. Sugie. 0.60-m f/3.7 reflector
+ CCD.
426 Woomera. Observer F. B. Zoltowski. 0.30-m f/3.3 Schmidt-Cassegrain + CCD.
557 Ondrejov. Observers P. Pravec, L. Sarounova. 0.65-m f/3.6 reflector
+ CCD.
658 Dominion Astrophysical Observatory. Observer D. D. Balam. 1.82-m
reflector + CCD.
704 Lincoln Laboratory ETS, New Mexico. Observers M. Blythe, F. Shelly,
M. Bezpalko. Measurers J. Stuart, H. Viggh, R. Sayer. 1.0-m f/2.15
reflector + CCD.
Orbital elements:
1998 QE2
Epoch 1998 Aug. 15.0 TT = JDT 2451040.5 Williams
M 33.38607 (2000.0) P Q
n 0.24259202 Peri. 344.28600 -0.55162136 +0.80754003
a 2.5461562 Node 251.80245 -0.73963813 -0.58928728
e 0.5835556 Incl. 12.69620 -0.38555067 -0.02489164
P 4.06 H 16.0 G 0.15
From 25 observations 1998 Aug. 19-22.
Ephemeris:
1998 QE2 a,e,i = 2.55, 0.58, 13 q = 1.0603
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1998 08 15 22 52.98 +19 54.9 0.977 1.877 141.2 19.8 18.3
1998 08 20 22 46.30 +19 24.4 0.992 1.915 145.7 17.3 18.3
1998 08 25 22 39.58 +18 43.0 1.012 1.953 149.8 15.1 18.3
.
.
1998 12 13 22 46.71 +05 08.6 2.606 2.695 84.4 21.3 21.3
1998 12 23 22 57.83 +05 29.2 2.800 2.754 77.1 20.4 21.4
1999 01 02 23 09.50 +06 00.5 2.991 2.810 70.0 19.2 21.6
1999 01 12 23 21.58 +06 40.7 3.176 2.866 62.9 17.8 21.7
1999 01 22 23 33.98 +07 28.3 3.353 2.920 56.0 16.2 21.8
1999 02 01 23 46.59 +08 22.0 3.520 2.972 49.2 14.5 21.9
1999 02 11 23 59.34 +09 20.2 3.676 3.023 42.5 12.7 22.0
Gareth V. Williams (C) Copyright 1998 MPC M.P.E.C. 1998-Q19
Target Name: 1998 QE2
D = 2.7 km
Period = 5.28 h
OC albedo = 0.1 (A standard guess; often conservative)
SNR/ SNR/
w DOY start date window RA, dec dist runs date run
22 148 2013 May 28 03:28-04:56 191, -34 0.045 54 1100 150
22 149 2013 May 29 03:09-06:12 199, -31 0.042 121 2200 200
22 150 2013 May 30 03:02-07:20 208, -28 0.040 179 3300 260
22 151 2013 May 31 03:00-08:24 216, -24 0.039 230 4400 310
22 152 2013 Jun 01 03:00-09:21 225, -19 0.039 272 5100 340
22 153 2013 Jun 02 03:03-10:11 232, -14 0.040 301 5200 330
23 154 2013 Jun 03 03:06-10:54 239, -9 0.042 315 4700 290
23 155 2013 Jun 04 03:10-11:30 245, -4 0.045 318 3900 240
23 156 2013 Jun 05 03:14-11:58 250, 0 0.048 313 3100 190
23 157 2013 Jun 06 03:17-12:22 255, +3 0.052 302 2300 140
23 158 2013 Jun 07 03:20-12:41 259, +6 0.056 289 1700 110
23 159 2013 Jun 08 03:23-12:57 262, +8 0.061 274 1300 84
23 160 2013 Jun 09 03:25-13:09 265, +10 0.065 259 960 64
24 161 2013 Jun 10 03:26-13:19 267, +12 0.071 244 720 49
24 162 2013 Jun 11 03:27-13:27 269, +13 0.076 231 540 38
24 163 2013 Jun 12 03:27-13:33 271, +15 0.081 218 420 30
24 164 2013 Jun 13 03:27-13:39 273, +16 0.087 206 320 24
24 165 2013 Jun 14 03:27-13:42 274, +17 0.093 195 250 19
This object is too far south for Goldstone to track prior to May 28.
Goldstone SNRs assume Ptx = 450 kW
Arecibo SNRs:
# SNR/ SNR/
start date window RA, dec dist runs Date run
2013 Jun 05 03:54-04:31 250, -1 0.047 22 13000 2800
2013 Jun 06 03:37-05:15 254, +3 0.051 56 20000 3000 * Overlap with Goldstone
2013 Jun 07 03:36-05:40 258, +6 0.055 65 18000 2500 *
2013 Jun 08 03:37-05:57 262, +8 0.060 68 15000 1900 *
2013 Jun 09 03:40-06:09 264, +10 0.065 67 11000 1400 * Overlap with Goldstone
2013 Jun 10 03:43-06:18 267, +12 0.070 65 8500 1100 *
2013 Jun 11 03:46-06:25 269, +13 0.075 62 6500 860 *
2013 Jun 12 03:48-06:30 271, +15 0.081 59 5000 680 *
2013 Jun 13 03:50-06:33 273, +16 0.086 56 3900 540
2013 Jun 14 03:51-06:36 274, +16 0.092 53 3000 430
2013 Jun 15 03:52-06:37 275, +17 0.097 50 2400 350
2013 Jun 16 03:52-06:38 277, +18 0.103 44 1800 290
2013 Jun 17 03:53-06:39 278, +18 0.109 42 1500 240
2013 Jun 18 03:52-06:38 279, +19 0.115 40 1200 200
2013 Jun 19 03:52-06:38 279, +19 0.121 38 990 170
2013 Jun 20 03:51-06:37 280, +20 0.127 39 840 140
2013 Jun 21 03:50-06:36 281, +20 0.133 37 700 120
2013 Jun 22 03:48-06:34 281, +20 0.139 35 580 100
2013 Jun 23 03:47-06:33 282, +20 0.145 34 490 88
2013 Jun 24 03:45-06:31 283, +20 0.151 32 420 76
2013 Jun 25 03:43-06:29 283, +21 0.158 31 360 66
2013 Jun 26 03:41-06:26 283, +21 0.164 30 310 58
2013 Jun 27 03:38-06:24 284, +21 0.170 29 260 51
2013 Jun 28 03:36-06:22 284, +21 0.176 28 230 45
2013 Jun 29 03:33-06:19 285, +21 0.183 27 200 40
Arecibo SNRs assume Ptx = 900 kW.
This object is too far south for Arecibo to track prior to June 5
Goldstone tracks:
DOY BOA BOT EOT EOA
150 0325 0455 0720 0750 DSS-14 GSSR AST 1998 QE2
152 0320 0450 0920 0950 DSS-14 GSSR AST 1998 QE2 Due to RFI with DSS-15, we will not turn on the transmitter until 0350
155 0315 0445 0950 1020 DSS-14 GSSR AST 1998 QE2
156 0735 0905 1105 1135 DSS-14 GSSR AST 1998 QE2 CANCELLED DUE TO EQUIPMENT PROBLEMS
157 0150 0320 0915 0945 DSS-14 GSSR AST 1998 QE2 CANCELLED DUE TO EQUIPMENT PROBLEMS: Motor generator
159 0700 0830 1200 1230 DSS-14 GSSR AST 1998 QE2 We cannot turn on the high power TX (even for calibrations) until 0715 UT
160 0155 0325 0850 0915 DSS-14 GSSR AST 1998 QE2
UT UT PDT AST Duration Round-trip
DOY Date TX Window TX Window TX Window hh:mm time (sec) SNR/Run Rotations
--- ---- --------- --------- --------- -------- ---------- ------- ---------
150 May 30 0355-0720 2055-0020 May 29-30 2355-0320 May 29-30 3:25 40 170 0.65 Too far south for Arecibo
152 Jun 01 0350-0920 2050-0220 May 31-Jun 01 2350-0520 May 31-Jun 01 5:30 39 200 1.04 Too far south for Arecibo
155 Jun 04 0330-0950 2030-0250 Jun 03-04 2330-0550 Jun 03-04 6:20 45 160 1.20 Too far south for Arecibo
156 Jun 05 0750-1105 0050-0405 Jun 05 0350-0705 Jun 05 3:15 48 130 0.62 Does not overlap Arecibo
157 Jun 06 0320-0915 2020-0215 Jun 05-06 2320-0515 Jun 05-06 5:55 52 96 1.12 Overlaps Arecibo from 0320-0515 UT
159 Jun 08 0715-1200 0015-0500 Jun 08 0415-0800 Jun 08 4:45 61 56 0.90 Does not overlap Arecibo
160 Jun 09 0325-0850 2025-0150 Jun 08-09 2325-0450 Jun 08-09 5:25 65 42 1.03 Overlaps Arecibo from 0340-0609 UT
We estimate that bistatic Goldstone -> Arecibo SNRs will be roughly 6x stronger than monostatic Goldstone SNRs.
Problems with the X-band receiver at Arecibo have forced cancellation of the bistatic observations.
NOTE: TXON is shown at the earliest time, which is only 15 min into the precal time on some dates.
Due to the 5.28-hour rotation period, the Goldstone observations should provide thorough rotational
coverage of this object. Observations on June 1, 4, 6, and 9 will cover more than one rotation.
Sky motion during the Goldstone dates is about 66 degrees. This could help with estimation of the pole direction.
Arecibo tracks:
UT UT PDT AST Duration Round-trip SNR/
DOY Date TX Window TX Window TX Window hh:mm time (sec) Run Rotations
--- ---- --------- --------- --------- -------- --------- ---- ---------
157 Jun 6 0337-0515 2037-2215 Jun 5 2337-0115 Jun 5- 6 1:38 51 3000 0.31 Overlaps Goldstone
158 Jun 7 0336-0540 2036-2240 Jun 6 2336-0140 Jun 6- 7 2:04 55 2500 0.39
159 Jun 8 0337-0557 2037-2257 Jun 7 2337-0157 Jun 7- 8 2:20 60 1900 0.44
160 Jun 9 0340-0609 2040-2309 Jun 8 2340-0209 Jun 8- 9 2:29 65 1400 0.47 Overlaps Goldstone
161 Jun 10 0343-0618 2043-2318 Jun 9 2343-0218 Jun 9-10 2:35 70 1100 0.49
162 Jun 11 0346-0625 2046-2325 Jun 10 2346-0225 Jun 10-11 2:39 75 860 0.50
163 Jun 12 0348-0630 2048-2330 Jun 11 2348-0230 Jun 11-12 2:42 81 680 0.51
From Jon Giorgini, 2013 June 7: For the s62 Patrick computed with an Arecibo delay, formal 3-sigma S/X-band uncertainties are: Date__(UT)__HR:MN POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2013-Jun-07 00:00 0.230 0.16 0.58 0.000003 2013-Jun-08 00:00 0.228 0.15 0.56 0.000005 2013-Jun-09 00:00 0.225 0.15 0.53 0.000010 2013-Jun-10 00:00 0.222 0.14 0.50 0.000015 2013-Jun-11 00:00 0.220 0.13 0.48 0.000020 2013-Jun-12 00:00 0.217 0.13 0.46 0.000025 Predict files have been updated at Goldstone, no change at Arecibo. - - - - - - - - - - From Horizons, 2013 May 24, Solution 44, # obs: 432 (1998-2013) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2013-May-29 00:00 * 197.71047 -31.77114 0.04297389249243 3.015 1.73 6.29 0.001143 2013-May-30 00:00 * 205.96248 -28.59478 0.04084015054289 3.882 2.49 9.06 0.001068 2013-May-31 00:00 * 214.37087 -24.61039 0.03954961497786 4.757 3.28 11.94 0.000964 2013-Jun-01 00:00 * 222.57537 -19.99249 0.03919143473426 5.511 3.94 14.32 0.000835 2013-Jun-02 00:00 * 230.26375 -15.05309 0.03979595111175 6.026 4.31 15.65 0.000688 2013-Jun-03 00:00 * 237.23184 -10.14658 0.04132548684754 6.252 4.33 15.74 0.000537 2013-Jun-04 00:00 * 243.39446 -5.56278 0.04368697403704 6.217 4.08 14.82 0.000395 2013-Jun-05 00:00 * 248.75925 -1.47196 0.04675802082195 5.995 3.66 13.28 0.000274 2013-Jun-06 00:00 *m 253.38929 2.06840 0.05041219899413 5.668 3.17 11.53 0.000188 2013-Jun-07 00:00 *m 257.37180 5.07634 0.05453516817417 5.298 2.70 9.82 0.000158 2013-Jun-08 00:00 *m 260.79817 7.60773 0.05903128042821 4.925 2.28 8.27 0.000181 2013-Jun-09 00:00 *m 263.75348 9.73050 0.06382402692960 4.572 1.91 6.93 0.000226 2013-Jun-10 00:00 *m 266.31236 11.51078 0.06885364795290 4.248 1.60 5.80 0.000273 2013-Jun-11 00:00 *m 268.53812 13.00705 0.07407396203722 3.956 1.33 4.85 0.000316 2013-Jun-12 00:00 *m 270.48355 14.26855 0.07944937555540 3.697 1.11 4.05 0.000353 2013-Jun-13 00:00 *m 272.19232 15.33569 0.08495239919470 3.466 0.93 3.39 0.000385 2013-Jun-14 00:00 *m 273.70039 16.24125 0.09056170485705 3.262 0.78 2.83 0.000411 2013-Jun-15 00:00 *m 275.03744 17.01170 0.09626064893850 3.080 0.65 2.36 0.000434 2013-Jun-16 00:00 *m 276.22797 17.66841 0.10203616451462 2.918 0.54 1.95 0.000452 - - - - - - - - - - - - - - - - - - - - From Horizons, 2013 Mar 1, Solution 26, # obs: 110 (1998-2009) Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2013-May-29 00:00 * 197.69120 -31.76282 0.04298478132123 190.027 79.94 290.52 0.031021 2013-May-30 00:00 * 205.94037 -28.58814 0.04084988855325 212.289 103.74 377.06 0.027678 2013-May-31 00:00 * 214.34668 -24.60582 0.03955790645910 232.286 126.17 458.56 0.023491 2013-Jun-01 00:00 * 222.55015 -19.99001 0.03919803520419 246.368 142.12 516.51 0.018613 2013-Jun-02 00:00 * 230.23852 -15.05235 0.03980072665180 251.819 147.72 536.89 0.013371 2013-Jun-03 00:00 * 237.20742 -10.14701 0.04132844126659 248.215 142.60 518.26 0.008182 2013-Jun-04 00:00 * 243.37135 -5.56380 0.04368823044699 237.372 129.61 471.08 0.003514 2013-Jun-05 00:00 * 248.73771 -1.47317 0.04675777492920 222.117 112.78 409.91 0.001966 2013-Jun-06 00:00 *m 253.36938 2.06726 0.05041067156523 205.048 95.38 346.67 0.005107 2013-Jun-07 00:00 *m 257.35348 5.07539 0.05453257241445 187.978 79.33 288.32 0.008078 2013-Jun-08 00:00 *m 260.78130 7.60700 0.05902780572596 171.927 65.40 237.71 0.010562 2013-Jun-09 00:00 *m 263.73794 9.72997 0.06381983394802 157.347 53.73 195.27 0.012602 2013-Jun-10 00:00 *m 266.29801 11.51044 0.06884886973612 144.351 44.10 160.26 0.014267 2013-Jun-11 00:00 *m 268.52482 13.00686 0.07406870756324 132.877 36.20 131.56 0.015624 2013-Jun-12 00:00 *m 270.47120 14.26846 0.07944373383216 122.781 29.73 108.04 0.016728 2013-Jun-13 00:00 *m 272.18079 15.33568 0.08494644306298 113.901 24.40 88.68 0.017625 2013-Jun-14 00:00 *m 273.68960 16.24131 0.09055549422022 106.073 19.99 72.67 0.018352 2013-Jun-15 00:00 *m 275.02731 17.01180 0.09625423338104 99.151 16.32 59.32 0.018937 ********************************************************************************************** Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: Date__(UT)__HR:MN R.A._(J2000.0)_DEC. delta APmag S-O-T /r T-O-M/Illu% 2013-May-14 00:00 142.87067 -36.84115 0.11433641235214 14.31 102.6222 /T 70.7/ 13.9 2013-May-16 00:00 145.47815 -37.16406 0.10346995829222 14.09 103.4621 /T 56.9/ 29.4 2013-May-18 00:00 148.79441 -37.49729 0.09269001345379 13.82 104.8302 /T 45.9/ 48.2 2013-May-20 00:00 153.08670 -37.79848 0.08208734500881 13.51 106.9186 /T 40.5/ 68.3 2013-May-22 00:00 158.74796 -37.96875 0.07180071230547 13.14 110.0141 /T 43.5/ 86.3 2013-May-24 00:00 166.33516 -37.78659 0.06205099447389 12.71 114.5423 /T 54.3/ 97.9 2013-May-26 00:00 176.53808 -36.78166 0.05320038021838 12.20 121.1028 /T 69.4/ 98.9 2013-May-28 00:00 189.87514 -34.07927 0.04583958132834 11.63 130.3730 /T 85.9/ 88.4 2013-May-30 00:00 205.88665 -28.55193 0.04084584272008 11.07 142.4955 /T 102.1/ 69.6 2013-Jun-01 00:00 222.49608 -19.95619 0.03918963774876 10.63 155.3185 /T 117.2/ 47.9 2013-Jun-03 00:00 237.15965 -10.11527 0.04131660529617 10.54 162.0638 /T 130.4/ 27.7 2013-Jun-05 00:00 248.69827 -1.44342 0.04674399992180 10.93 158.5218 /T 141.0/ 12.0 2013-Jun-07 00:00 257.32137 5.10272 0.05451803365269 11.45 152.0831 /L 148.3/ 2.5 2013-Jun-09 00:00 263.71148 9.75466 0.06380519359940 11.95 146.7030 /L 150.0/ 0.2 2013-Jun-11 00:00 268.50253 13.02898 0.07405429414795 12.38 142.7700 /L 144.3/ 5.0 2013-Jun-13 00:00 272.16158 15.35550 0.08493241608681 12.76 140.0010 /L 132.8/ 16.3 2013-Jun-15 00:00 275.01041 17.02960 0.09624067314686 13.08 138.0901 /L 117.7/ 32.9 2013-Jun-17 00:00 277.26821 18.24487 0.10785817613413 13.37 136.8037 /L 100.1/ 53.0 2013-Jun-19 00:00 279.08578 19.12826 0.11970975779028 13.62 135.9751 /L 80.6/ 73.8 2013-Jun-21 00:00 280.56859 19.76445 0.13174791867325 13.85 135.4865 /L 60.6/ 91.0 2013-Jun-23 00:00 281.79180 20.21113 0.14394285984536 14.05 135.2533 /L 43.8/ 99.6 2013-Jun-25 00:00 282.81002 20.50833 0.15627722880142 14.24 135.2141 /L 39.1/ 96.3 2013-Jun-27 00:00 283.66400 20.68430 0.16874328045523 14.41 135.3230 /L 50.3/ 82.5 2013-Jun-29 00:00 284.38526 20.75942 0.18134068436316 14.57 135.5451 /L 68.4/ 62.8 2013-Jul-01 00:00 284.99891 20.74889 0.19407440587353 14.72 135.8526 /L 87.8/ 42.0 2013-Jul-03 00:00 285.52534 20.66453 0.20695299880508 14.86 136.2230 /L 106.5/ 23.5 2013-Jul-05 00:00 285.98130 20.51578 0.21998747552127 14.99 136.6373 /L 123.6/ 9.6 2013-Jul-07 00:00 286.38072 20.31048 0.23319056590617 15.12 137.0796 /L 137.1/ 1.6 2013-Jul-09 00:00 286.73524 20.05525 0.24657615466674 15.24 137.5359 /T 142.4/ 0.6 2013-Jul-11 00:00 287.05467 19.75587 0.26015880365772 15.36 137.9940 /T 136.1/ 6.8 2013-Jul-13 00:00 287.34730 19.41747 0.27395334921252 15.47 138.4431 /T 121.3/ 19.8 2013-Jul-15 00:00 287.62010 19.04468 0.28797458378962 15.58 138.8734 /T 102.3/ 38.1 2013-Jul-17 00:00 287.87889 18.64173 0.30223703036295 15.69 139.2763 /T 80.9/ 59.5 2013-Jul-19 00:00 288.12846 18.21248 0.31675486907021 15.80 139.6440 /T 58.9/ 80.3 2013-Jul-21 00:00 288.37268 17.76041 0.33154218405429 15.90 139.9695 /T 40.1/ 95.2 2013-Jul-23 00:00 288.61462 17.28860 0.34661364975426 16.01 140.2467 /T 35.5/ 99.7 2013-Jul-25 00:00 288.85687 16.79974 0.36198528018417 16.11 140.4704 /T 49.6/ 92.7 2013-Jul-27 00:00 289.10179 16.29622 0.37767445188381 16.21 140.6360 /T 70.5/ 77.1 2013-Jul-29 00:00 289.35167 15.78029 0.39369907552824 16.31 140.7402 /T 92.0/ 57.5 2013-Jul-31 00:00 289.60870 15.25416 0.41007664949449 16.41 140.7800 /T 112.5/ 37.9
With a diameter of 2.7 km and a rotation period of 5.28 hours, we are expecting a bandwidth
of about 50 Hz if the subradar latitude is close to the equator.
We're going to start with the following setup, which should produce an echo quickly
and resolve it in Doppler frequency. Then we'll do 10 usec and 11 usec ranging
followed by imaging as soon as possible.
CW setup:
---------------------------------------------------------------------------
TX polarization RCP
RCV polarization LCP & RCP
Frequency hops: 2
Dwell: 20 seconds This means that we won't get two complete hops per run, but that's OK.
Bandwidth: 4000 Hz
Sampling interval: 2500 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 aardvark:
/export/data3/osod/ops/a285263/PRDX.OUT.14v-14-14.s50
/PUNCH.OUT.14v-14-14.s50
/EPH.OUT.s50
POINTING
TX Offsets
Date (UTC) DOY hhmmss RA Dec Macro LHA Dec RTT OSOD
2013 05 30 150 020000 206.8470 -28.3724 A -3.80 1.70 40.6 s50
2013 05 30 150 030000 207.1861 -28.2226 A -3.80 1.70 40.5
2013 05 30 150 040000 207.5236 -28.0701 A -3.80 1.80 40.5
2013 05 30 150 050000 207.8601 -27.9147 A -3.80 1.80 40.4
2013 05 30 150 060000 208.1966 -27.7564 A -3.80 1.80 40.3
2013 05 30 150 070000 208.5341 -27.5952 A -3.80 1.80 40.3
2013 05 30 150 080000 208.8733 -27.4314 A -3.80 1.80 40.2
Transmit offsets are given in millidegrees.
PRDX.OUT.14f-14-14.50
TRANSMITTER: STATION #14, RECEIVER: STATION #14
RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2013 MAY 30 02:00 40.6020902906 177935.711 314.0175 -28.3724 206.847 12.872
2013 MAY 30 02:10 40.5896581736 176789.917 316.4677 -28.3476 206.904 14.164
2013 MAY 30 02:20 40.5773072316 175619.689 318.9180 -28.3227 206.960 15.408
2013 MAY 30 02:30 40.5650391355 174426.082 321.3683 -28.2978 207.017 16.600
2013 MAY 30 02:40 40.5528554955 173210.192 323.8186 -28.2728 207.073 17.740
2013 MAY 30 02:50 40.5407578290 171973.155 326.2690 -28.2477 207.130 18.823
2013 MAY 30 03:00 40.5287475773 170716.145 328.7195 -28.2226 207.186 19.847
2013 MAY 30 03:10 40.5168260930 169440.375 331.1700 -28.1974 207.242 20.809
2013 MAY 30 03:20 40.5049946623 168147.089 333.6206 -28.1721 207.299 21.707
2013 MAY 30 03:30 40.4932544536 166837.565 336.0712 -28.1467 207.355 22.539
2013 MAY 30 03:40 40.4816065643 165513.109 338.5218 -28.1212 207.411 23.301
2013 MAY 30 03:50 40.4700519991 164175.056 340.9725 -28.0957 207.467 23.990
2013 MAY 30 04:00 40.4585916540 162824.763 343.4232 -28.0701 207.524 24.606
2013 MAY 30 04:10 40.4472263482 161463.613 345.8739 -28.0444 207.580 25.145
2013 MAY 30 04:20 40.4359567889 160093.005 348.3246 -28.0186 207.636 25.606
2013 MAY 30 04:30 40.4247835917 158714.358 350.7754 -27.9927 207.692 25.987
2013 MAY 30 04:40 40.4137072678 157329.103 353.2261 -27.9668 207.748 26.286
2013 MAY 30 04:50 40.4027282319 155938.685 355.6769 -27.9408 207.804 26.502
2013 MAY 30 05:00 40.3918467928 154544.557 358.1277 -27.9147 207.860 26.635
2013 MAY 30 05:10 40.3810631592 153148.180 0.5785 -27.8885 207.916 26.683
2013 MAY 30 05:20 40.3703774376 151751.017 3.0293 -27.8622 207.972 26.647
2013 MAY 30 05:30 40.3597896316 150354.534 5.4800 -27.8359 208.028 26.527
2013 MAY 30 05:40 40.3492996472 148960.194 7.9308 -27.8095 208.084 26.323
2013 MAY 30 05:50 40.3389072781 147569.458 10.3815 -27.7830 208.140 26.036
2013 MAY 30 06:00 40.3286122208 146183.777 12.8322 -27.7564 208.197 25.667
2013 MAY 30 06:10 40.3184140751 144804.595 15.2829 -27.7297 208.253 25.218
2013 MAY 30 06:20 40.3083123257 143433.344 17.7336 -27.7030 208.309 24.690
2013 MAY 30 06:30 40.2983063765 142071.439 20.1842 -27.6762 208.365 24.085
2013 MAY 30 06:40 40.2883955187 140720.279 22.6348 -27.6493 208.421 23.405
2013 MAY 30 06:50 40.2785789506 139381.244 25.0853 -27.6223 208.478 22.652
2013 MAY 30 07:00 40.2688557747 138055.688 27.5358 -27.5952 208.534 21.830
2013 MAY 30 07:10 40.2592250042 136744.945 29.9863 -27.5681 208.590 20.940
2013 MAY 30 07:20 40.2496855457 135450.317 32.4367 -27.5409 208.647 19.985
2013 MAY 30 07:30 40.2402362342 134173.078 34.8870 -27.5137 208.703 18.968
2013 MAY 30 07:40 40.2308758025 132914.470 37.3373 -27.4863 208.760 17.892
2013 MAY 30 07:50 40.2216029023 131675.699 39.7875 -27.4589 208.817 16.758
2013 MAY 30 08:00 40.2124161019 130457.937 42.2377 -27.4314 208.873 15.571
1998 QE2 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/1998QE2/1998QE2_planning.html
Asteroid Radar Astronomy