Goldstone Radar Observations Planning: Asteroid 1999 KW4 in 2019
(66391) 1999 KW4 1999 KW4 is a binary system that was discovered by LINEAR on May 20, 1999. 1999 KW4 was imaged extensively with radar at Goldstone and Arecibo during a close encounter within 0.032 au in May and June of 2001, from which Ostro et al. (2006) estimated 3D models of the primary, referred to as "Alpha," and the secondary, designated as "Beta." The Alpha model has major axes of 1.5 x 1.5 x 1.3 km, an effective diameter of 1.3 km, and a shape that resembles a top. Alpha also has a pronounced ridge along its equator. The Beta model is significantly smaller with major axes of 0.57 x 0.46 x 0.35 km and its long axis is oriented toward Alpha (albeit with small oscillations). 1999 KW4 was the third binary near-Earth asteroid imaged by radar, following 2000 DP107 and 2000 UG11, and was the first imaged in detail. Additional radar observations were conducted at Arecibo in 2002, 2017, and 2018, and at Goldstone in 2018. Alpha has a rotation period of 2.76 h and a pole direction of (lambda, beta) = (326, -65) degrees. The orbital and rotation periods of Beta are synchronous with a period of 17.42 hours, but Beta librates during its motion about Alpha, and there are periodic changes in the motion caused by the non-spherica shape of Alpha and the deep perihelion of only 0.200 au, which results in solar tidal effects (Scheeres et al. 2006). The bulk densities of Alpha and Beta are 1.97+-0.24 and 2.81+0.82-0.63 g/cm^3. For additional details about 1999 KW4's physical and orbital properties, please see Ostro et al. (2006) and Scheeres et al. (2006). Radar observations in 2019 will be used to test the prediction by McMahon and Scheeres (2010) that the BYORP effect is changing the mean anomaly (with a sufficient reduction in the orbital uncertainties). Alternately, it is possible that 1999 KW4 will be in an equilibrium state between BYORP and tidal friction. If so, then because a model for Beta is available, this could enable use to estimate the rigidity of the primary and the quality factor Q. 1999 KW4 will approach within 0.0346 au on 2019 May 25. Due to the klystron situation at Goldstone, we _might_ be able to observe the asteroid with a transmitter power of 250 kW if we receive the refurbished klyston in time. If so, then 1999 KW4 will be an imaging target at Goldstone and we might be able to obtain images with a range resolution as fine as 15 m/pixel. Update on 2019 May 22: A functional klystron will not be available at DSS-14 so monostatic observations will not occur at Goldstone. We have scheduled time at DSS-13 instead and have requested time at the Green Bank Telescope to receive. In 2019, the asteroid will approach from the south, and the first day of visibility also coincides with the closest approach (May 25). Thereafter the asteroid will move north and the SNRs will rapidly diminish as the asteroid moves away from Earth. Due to the southern declinations, 1999 KW4 is observable at Goldstone four days before it enters the beam at Arecibo. 1999 KW4 has the least accessible delta-V for a spacecraft mission of any known binary near-Earth asteroid due to its heliocentric inclination of 39 degrees, eccentricity of 0.7, and semimajor axis of 0.64 au. This object will be the target of an extensive observing campaign supported by NASA's Planetary Defense Coordination Office. 1999 KW4 has been classified as a "Potentially Hazardous Asteroid" by the Minor Planet Center.
Orbital and Physical Characteristics Name 1999 KW4 Number 66391 Discoverer LINEAR Discovery date 1999 May 20 orbit type Aten Close approach date 2019 May 25 Close approach dist. 0.0346 au Close approach dist. 13.5 lunar distances semimajor axis 0.642 au eccentricity 0.688 inclination 38.9 deg orbital period 0.515 y perihelion distance 0.200 au (215 solar radii) aphelion distance 1.084 au MOID 0.0133 au Tisserand parameter 8.500 (asteroidal) absolute magnitude (H) 16.5 Primary diameter 1.32 km BINARY Secondary diameter 0.45 km optical albedo 0.26 spectral class S Primary rotation period 2.7645 h Secondary rotation period 17.42 h (same as the orbital period, ignoring librations) lightcurve amplitude 0.12 mag pole direction (lambda, beta) = (326, -62) PHA Last update: 2019 May 22
1999 KW4 Close Approaches Within 0.1 au: 1900-2100 Date (TDB) Body CA Dist MinDist MaxDist Vrel TCA3Sg Nsigs P_i/p A.D. 1913 May 26.71707 Earth .074553 .074551 .074554 19.928 0.08 1.82E6 .000000 A.D. 1914 May 25.18226 Earth .037573 .037571 .037575 21.555 0.00 9.50E5 .000000 A.D. 1931 May 26.08135 Earth .029699 .029697 .029701 20.492 0.05 1.03E6 .000000 A.D. 1932 May 25.06168 Earth .091132 .091130 .091134 22.770 0.03 1.13E6 .000000 A.D. 1948 May 27.37092 Earth .094582 .094581 .094583 19.768 0.05 2.55E6 .000000 A.D. 1949 May 25.21601 Earth .017230 .017229 .017230 21.095 0.01 8.50E5 .000000 A.D. 1966 May 26.32639 Earth .044309 .044309 .044310 20.286 0.02 1.19E6 .000000 A.D. 1967 May 25.83128 Earth .073726 .073725 .073726 22.364 0.01 1.05E6 .000000 A.D. 1983 May 28.36245 Earth .096906 .096906 .096907 19.753 0.01 3.89E6 .000000 A.D. 1984 May 25.14801 Earth .016075 .016075 .016075 21.071 0.00 8.00E5 .000000 A.D. 2001 May 25.97992 Earth .032332 .032332 .032332 20.469 0.00 4.47E8 .000000 A.D. 2002 May 25.90999 Earth .088929 .088929 .088929 22.743 0.00 2.06E7 .000000 A.D. 2018 May 27.55763 Earth .078181 .078181 .078181 19.900 0.01 1.92E6 .000000 A.D. 2019 May 25.96154 Earth .034640 .034640 .034640 21.513 0.00 8.00E5 .000000 A.D. 2036 May 25.57154 Earth .015529 .015529 .015529 20.798 0.01 8.17E5 .000000 A.D. 2053 May 27.12957 Earth .067820 .067819 .067821 20.008 0.03 1.49E6 .000000 A.D. 2054 May 25.88683 Earth .045694 .045694 .045695 21.760 0.00 7.42E5 .000000 A.D. 2071 May 26.53499 Earth .017518 .017517 .017518 20.740 0.02 8.19E5 .000000 A.D. 2088 May 27.67892 Earth .086544 .086543 .086545 19.844 0.05 1.85E6 .000000 A.D. 2089 May 25.84400 Earth .023855 .023854 .023856 21.300 0.01 7.33E5 .000000 1999 KW4 approaches within 0.05 au of Earth several times each century. This trend exists from at least 1600-2500.
Orbital motion of 1999 KW4 from December 2017 until July 2019 shown in helicentric reference frame. The asteroid makes two close flybys during this interval. The animation begins with an oblique view and then tilts to a perspective looking down on the plane of Earth's orbit from the north. The animation illustrates the unusually eccentric orbit and deep perihelion of only 0.200 au, which is inside the semimajor axis of Mercury. Close Earth encounters tend to be relatively long because they occur near aphelion when 1999 KW4's orbital motion is slow.
1999 KW4 https://minorplanetcenter.net/mpec/J99/J99K28.html
1999 KW4 Goldstone SNRs PRIMARY (ALPHA) 1999 KW4: D = 1.32 km, P = 2.765 h, OC albedo = 0.11, pole = (326, -65) <---MONOSTATIC--> DSS13-GBT GBT overlap DOY start date window RA, dec dist delta runs SNR/day SNR/run SNR/RTT 30 deg 20 deg 145-146 2019 May 25-26 23:09-01:05 126, -33 0.035 -26 91 600 64 10 None None 146-147 2019 May 26-27 22:17-04:15 144, -21 0.037 -9 265 910 61 * 10 None 2011-0115 Requested 147-148 2019 May 27-28 22:11-05:47 157, -11 0.043 +5 294 610 39 6 2211-0152 2211-0302 Requested 148-149 2019 May 28-29 22:11-06:40 165, -3 0.052 +15 278 340 22 * 4 2213-0303 2213-0402 149-150 2019 May 29-30 22:13-07:13 170, +2 0.062 +21 251 180 12 * 2 2213-0344 2213-0439 150-151 2019 May 30-31 22:13-07:35 174, +6 0.073 +26 224 100 7 * 1 151-152 2019 May 31-01 22:14-07:50 177, +9 0.084 +29 200 59 4 152-153 2019 Jun 01-02 22:13-08:00 180, +11 0.095 +31 180 37 3 153-154 2019 Jun 02-03 22:12-08:08 182, +13 0.107 +33 164 24 2 Goldstone SNRs assume Ptx = 250 kW and Tsys = 17 K. DSS-13/GBT SNRs assume Ptx = 80 kW SECONDARY (BETA) 1999 KW4: D = 0.45 km, P = 17.42 h, OC albedo = 0.11, pole = (326, -62) <---MONOSTATIC--> DSS13-GBT DOY start date window RA, dec dist delta runs SNR/day SNR/run SNR/RTT 145-146 2019 May 25-26 23:09-01:05 126, -33 0.035 -26 91 300 32 too far south 146-147 2019 May 26-27 22:17-04:15 144, -21 0.037 -9 265 460 30 5 147-148 2019 May 27-28 22:11-05:47 157, -11 0.043 +5 294 310 20 4 148-149 2019 May 28-29 22:11-06:40 165, -3 0.052 +15 278 170 11 2 149-150 2019 May 29-30 22:13-07:13 170, +2 0.062 +21 251 91 6 1 150-151 2019 May 30-31 22:13-07:35 174, +6 0.073 +26 224 50 4 151-152 2019 May 31-01 22:14-07:50 177, +9 0.084 +29 200 30 2 152-153 2019 Jun 01-02 22:13-08:00 180, +11 0.095 +31 180 18 1 153-154 2019 Jun 02-03 22:12-08:08 182, +13 0.107 +33 164 12 1 These SNRs assume Ptx = 250 kW and Tsys = 17 K. SNRs also use the radar albedo, effective diameter, and spin vector estimated from the 2001 radar and lightcurve observations. 1999 KW4 Arecibo SNRs PRIMARY (Alpha) SNRs 1999 KW4 Alpha: D = 1.32 km, P = 2.765 h, OC albedo = 0.11, pole = (326, -62) start date window RA, dec dist delta runs SNR/day SNR/run 2019 May 29-30 22:36-00:02 170, +2 0.061 +23 41 760 130 2019 May 30-31 22:29-00:33 174, +6 0.071 +28 51 610 94 2019 May 31-01 22:28-00:50 177, +9 0.082 +31 50 380 58 2019 Jun 01-02 22:29-01:00 179, +11 0.094 +34 47 240 37 2019 Jun 02-03 22:30-01:07 181, +12 0.105 +35 44 160 25 2019 Jun 03-04 22:31-01:11 183, +14 0.117 +37 40 110 18 2019 Jun 04-05 22:31-01:13 184, +15 0.129 +38 37 74 13 2019 Jun 05-06 22:30-01:14 185, +16 0.141 +39 34 53 9 2019 Jun 06-07 22:30-01:14 186, +17 0.153 +40 32 39 7 2019 Jun 07-08 22:29-01:14 187, +17 0.165 +41 29 29 6 2019 Jun 08-09 22:28-01:13 188, +18 0.177 +41 26 21 4 2019 Jun 09-10 22:26-01:12 188, +18 0.188 +42 24 16 3 2019 Jun 10-11 22:24-01:10 189, +19 0.200 +42 22 13 3 Arecibo SNRs assume Ptx = 400 kW, Tsys = 25 K, and Gain = 8 K/Jy SECONDARY (Beta) SNRs 1999 KW4 Beta: D = 0.45 km, P = 17.42 h, OC albedo = 0.11, pole = (326, -62) start date window RA, dec dist delta runs SNR/day SNR/run 2019 May 29-30 22:36-00:02 170, +2 0.061 +23 41 380 67 2019 May 30-31 22:29-00:33 174, +6 0.071 +28 51 300 47 2019 May 31-01 22:28-00:50 177, +9 0.082 +31 50 190 29 2019 Jun 01-02 22:29-01:00 179, +11 0.094 +34 47 120 19 2019 Jun 02-03 22:30-01:07 181, +12 0.105 +35 44 79 13 2019 Jun 03-04 22:31-01:11 183, +14 0.117 +37 40 53 9 2019 Jun 04-05 22:31-01:13 184, +15 0.129 +38 37 37 6 2019 Jun 05-06 22:30-01:14 185, +16 0.141 +39 34 26 5 2019 Jun 06-07 22:30-01:14 186, +17 0.153 +40 32 19 4 2019 Jun 07-08 22:29-01:14 187, +17 0.165 +41 29 14 3 2019 Jun 08-09 22:28-01:13 188, +18 0.177 +41 26 11 2 Arecibo SNRs assume Ptx = 400 kW, Tsys = 25 K, and Gain = 8 K/Jy
Track Assignments
DOY BOA BOT EOT EOA 136 0000 0130 0245 0315 DSS-14 AST 2002 QF15 Cancelled 137 0200 0330 0410 0440 DSS-14 AST 2002 QF15 Cancelled 138 0130 0300 0440 0510 DSS-14 AST 2002 QF15 Cancelled 139 0115 0245 0510 0540 DSS-14 AST 2002 QF15 Cancelled 139 2215 2345 0240 0310 DSS-14 AST 2002 QF15 Cancelled 141 0300 0230 0605 0635 DSS-14 AST 2002 QF15 Cancelled 143 0215 0345 0700 0730 DSS-14 AST 2002 QF15 Cancelled 146 2135 2255 0025 DSS-14 AST 1999 KW4 Cancelled 147 0225 0330 0400 DSS-14 AST 2002 QF15 Cancelled 149 0045 0215 0320 0350 DSS-14 AST 1999 KW4 Cancelled 150 0020 0150 0320 0350 DSS-14 AST 1999 KW4 Cancelled 151 0215 0345 0515 0545 DSS-14 AST 1999 KW4 Cancelled 146 1840 2010 0115 0145 DSS-13 AST 1999 KW4 147 2040 2210 0300 0330 DSS-13 AST 1999 KW4 Goldstone Schedule in more detail: DSS-14 UT UT PDT Round-trip Monostatic DOY Date Target TX Window TX Window time (sec) SNR/RTT 136 May 16 2002 QF15 0030 0245 1730-1945 May 15 99 25 Cancelled 137 May 17 2002 QF15 0230 0410 1930-2110 May 16 95 29 Cancelled 138 May 18 2002 QF15 0200 0440 1900-2140 May 17 91 33 Cancelled 139 May 19 2002 QF15 0145 0510 1845-2210 May 18 89 36 Cancelled 139-140 May 19-20 2002 QF15 2245 0240 1545-1940 May 19 88 38 Cancelled 141 May 21 2002 QF15 0330 0605 2030-2305 May 20 88 38 Cancelled 143 May 23 2002 QF15 0245 0700 1945-0000 May 22 92 32 Cancelled 146-147 May 26-27 1999 KW4 2220 0330 1520-2030 May 26 37 61 Cancelled 147 May 27 2002 QF15 0125 0330 1825-2030 May 26 112 17 Cancelled 149 May 29 1999 KW4 0115 0320 1815-2020 May 28 52 22 Cancelled 150 May 30 1999 KW4 0050 0320 1750-2020 May 29 62 12 Cancelled 151 May 31 1999 KW4 0245 0515 1945-2215 May 30 73 7 Cancelled DSS-13/Green Bank Telescope Tracks: DSS13/GBT SNR/RTT (primary) 146-147 May 26-27 1999 KW4 2130 0115 1430-1815 May 26 37 10 147-148 May 27-28 1999 KW4 2135 0300 1435-2000 May 27 43 6 Arecibo Schedule: UT Date Target TX Window May 20 2002 QF15 2108-2302 May 21 2002 QF15 2118-2333 May 22 2002 QF15 2131-2359 May 23 2002 QF15 2145-0022 May 24 2002 QF15 2159-0041 May 25 2002 QF15 2213-0058 May 29-30 1999 KW4 2236-0002 May 30-31 1999 KW4 2229-0033 May 31-01 1999 KW4 2228-0050 Jun 01-02 1999 KW4 2229-0100 Jun 02-03 1999 KW4 2230-0107 Jun 03-04 1999 KW4 2231-0111 Jun 04-05 1999 KW4 2231-0113
Uncertainties
1999 KW4 JPL/Horizons solution 267, # obs: 3367 (1998-2019): 2019 May 22 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2019-May-15 00:00 *m 30.14426 -32.50159 0.14025698741787 0.256 0.04 0.15 0.000048 2019-May-16 00:00 *m 31.50420 -33.28484 0.12830040577920 0.274 0.05 0.19 0.000049 2019-May-17 00:00 * 33.18736 -34.18359 0.11642651191190 0.296 0.07 0.25 0.000050 2019-May-18 00:00 * 35.31150 -35.22835 0.10466529640390 0.321 0.09 0.33 0.000052 2019-May-19 00:00 * 38.05714 -36.45662 0.09306169519323 0.352 0.12 0.44 0.000056 2019-May-20 00:00 * 41.71182 -37.90991 0.08168547395892 0.389 0.17 0.60 0.000060 2019-May-21 00:00 * 46.75142 -39.61829 0.07064948802669 0.433 0.23 0.82 0.000067 2019-May-22 00:00 * 53.98446 -41.54404 0.06014457240921 0.482 0.31 1.12 0.000076 2019-May-23 00:00 * 64.75055 -43.40038 0.05050666130284 0.530 0.40 1.47 0.000089 2019-May-24 00:00 * 80.82637 -44.17200 0.04233551386697 0.555 0.47 1.72 0.000105 2019-May-25 00:00 * 102.56864 -41.52431 0.03662910484768 0.521 0.39 1.41 0.000121 2019-May-26 00:00 * 125.45158 -33.38305 0.03462956775725 0.456 0.09 0.33 0.000129 2019-May-27 00:00 * 143.58066 -21.96426 0.03694330321408 0.459 0.33 1.20 0.000123 2019-May-28 00:00 * 155.94903 -11.53912 0.04287542582752 0.468 0.42 1.54 0.000108 2019-May-29 00:00 * 164.21586 -3.73538 0.05117938408261 0.439 0.37 1.34 0.000093 2019-May-30 00:00 * 169.91929 1.79406 0.06088798497188 0.392 0.29 1.04 0.000081 2019-May-31 00:00 * 174.02366 5.73858 0.07142558441829 0.345 0.21 0.78 0.000072 2019-Jun-01 00:00 *m 177.09600 8.62643 0.08246924079173 0.303 0.16 0.58 0.000065 2019-Jun-02 00:00 *m 179.47510 10.80269 0.09383411606081 0.268 0.12 0.44 0.000059 2019-Jun-03 00:00 *m 181.37082 12.48697 0.10540953040406 0.238 0.09 0.34 0.000055 2019-Jun-04 00:00 *m 182.91828 13.82098 0.11712578383880 0.214 0.07 0.26 0.000052 2019-Jun-05 00:00 *m 184.20773 14.89855 0.12893677461297 0.193 0.06 0.20 0.000050 Ephemeris with Visual Magnitudes, Distances, Solar Elongations, Lunar Elongations, and Lunar Phases 1999 KW4 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-brt S-O-T /r T-O-M/Illu% 2019-May-15 00:00 30.16104 -32.49247 0.14024614312019 16.77 5.64 55.1653 /L 142.3/ 81.5 2019-May-16 00:00 31.52271 -33.27489 0.12828944850805 16.58 5.65 55.9667 /L 142.4/ 89.5 2019-May-17 00:00 33.20795 -34.17259 0.11641555724896 16.37 5.66 56.7740 /L 138.5/ 95.4 2019-May-18 00:00 35.33464 -35.21601 0.10465449975696 16.14 5.66 57.5986 /L 131.9/ 98.9 2019-May-19 00:00 38.08346 -36.44250 0.09305127244110 15.88 5.67 58.4620 /L 124.1/ 99.9 2019-May-20 00:00 41.74213 -37.89333 0.08167573584497 15.59 5.67 59.4051 /L 116.3/ 98.5 2019-May-21 00:00 46.78671 -39.59814 0.07064089882962 15.25 5.66 60.5091 /L 109.1/ 94.9 2019-May-22 00:00 54.02560 -41.51840 0.06013784993922 14.85 5.64 61.9388 /L 103.7/ 89.5 2019-May-23 00:00 64.79687 -43.36597 0.05050293421748 14.37 5.59 64.0311 /T 101.2/ 82.7 2019-May-24 00:00 80.87152 -44.12434 0.04233648495272 13.82 5.50 67.4275 /T 103.3/ 74.7 2019-May-25 00:00 102.59672 -41.46227 0.03663684248007 13.21 5.34 73.0181 /T 111.5/ 65.9 2019-May-26 00:00 125.45262 -33.31745 0.03464511412184 12.71 5.14 80.9254 /T 125.7/ 56.7 2019-May-27 00:00 143.56436 -21.90956 0.03696511122769 12.49 4.96 89.1580 /T 141.6/ 47.2 2019-May-28 00:00 155.92700 -11.49872 0.04290073311313 12.57 4.83 95.4325 /T 154.0/ 37.8 2019-May-29 00:00 164.19349 -3.70586 0.05120627508635 12.81 4.75 99.3840 /T 158.5/ 28.7 2019-May-30 00:00 169.89837 1.81638 0.06091555931351 13.10 4.71 101.6675 /T 153.9/ 20.3 2019-May-31 00:00 174.00459 5.75614 0.07145348447102 13.40 4.69 102.9155 /T 144.7/ 12.9 2019-Jun-01 00:00 177.07873 8.64075 0.08249734139237 13.68 4.67 103.5326 /T 133.8/ 6.9 2019-Jun-02 00:00 179.45945 10.81468 0.09386238503098 13.94 4.67 103.7559 /T 122.0/ 2.5 2019-Jun-03 00:00 181.35658 12.49724 0.10543797115148 14.19 4.66 103.7245 /T 109.6/ 0.3 2019-Jun-04 00:00 182.90528 13.82993 0.11715441204345 14.41 4.66 103.5224 /T 96.9/ 0.5 2019-Jun-05 00:00 184.19580 14.90646 0.12896560879651 14.62 4.66 103.2020 /T 83.8/ 3.2 2019-Jun-06 00:00 185.29035 15.79062 0.14083963734312 14.81 4.67 102.7972 /T 70.6/ 8.4 2019-Jun-07 00:00 186.23307 16.52707 0.15275344252954 14.98 4.67 102.3307 /T 57.4/ 15.9 2019-Jun-08 00:00 187.05600 17.14784 0.16468973155165 15.15 4.67 101.8182 /T 44.4/ 25.2 2019-Jun-09 00:00 187.78295 17.67644 0.17663508865728 15.31 4.68 101.2705 /T 31.9/ 35.9 2019-Jun-10 00:00 188.43194 18.13048 0.18857879098841 15.45 4.68 100.6957 /T 21.1/ 47.3 2019-Jun-11 00:00 189.01682 18.52336 0.20051203929515 15.59 4.69 100.0995 /T 15.6/ 58.7 2019-Jun-12 00:00 189.54842 18.86550 0.21242744119813 15.72 4.69 99.4863 /T 20.1/ 69.5 2019-Jun-13 00:00 190.03535 19.16506 0.22431865239982 15.84 4.69 98.8595 /T 30.4/ 79.3 2019-Jun-14 00:00 190.48446 19.42853 0.23618011918209 15.95 4.70 98.2216 /T 42.2/ 87.5 2019-Jun-15 00:00 190.90136 19.66117 0.24800688740125 16.06 4.70 97.5747 /T 54.5/ 93.8 2019-Jun-16 00:00 191.29061 19.86723 0.25979445636505 16.17 4.71 96.9203 /T 66.8/ 97.9 2019-Jun-17 00:00 191.65600 20.05022 0.27153866430724 16.27 4.71 96.2598 /T 78.9/ 99.8 2019-Jun-18 00:00 192.00068 20.21305 0.28323559754535 16.36 4.71 95.5942 /T 90.9/ 99.6 2019-Jun-19 00:00 192.32732 20.35816 0.29488151867394 16.45 4.71 94.9244 /T 102.6/ 97.2 2019-Jun-20 00:00 192.63815 20.48762 0.30647281081046 16.54 4.72 94.2511 /T 114.0/ 93.1 2019-Jun-21 00:00 192.93509 20.60316 0.31800593546462 16.62 4.72 93.5749 /T 125.1/ 87.4 2019-Jun-22 00:00 193.21978 20.70630 0.32947740158237 16.70 4.72 92.8963 /T 135.7/ 80.3 2019-Jun-23 00:00 193.49363 20.79832 0.34088374318014 16.78 4.72 92.2158 /T 145.5/ 72.2 2019-Jun-24 00:00 193.75783 20.88037 0.35222150299594 16.85 4.72 91.5336 /T 154.1/ 63.4 2019-Jun-25 00:00 194.01345 20.95341 0.36348721981190 16.92 4.72 90.8501 /T 159.6/ 54.0
Setups
The equatorial diameter, rapid rotation period, and a nearly equatorial view indicate that the bandwidths at Goldstone will be about 55 Hz. As such, and due to the small Doppler uncertainties, we won't see any Doppler corrections to the ephemeris, but we should be able to measure range corrections. CW setup --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 5000 Hz FFT for PFS files: 1000 for 5.0 Hz resolution TXoffset +500 Hz Ranging setups: --------------------------------------------------------------------------- 10-usec baud 10 usec code 127 PRP 1270 usec FFT 64 ncoh 1 bandwidth 787 Hz resolution 12.3 Hz TXOFF +100 Hz (echo in column 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 column 32 + 9 = 41) ------------------------------------------------------------------------- 1-usec baud 1 usec code 255 ncoh 2 bandwidth 1960.8 Hz FFT 128 resolution 15.3 Hz TXOFF +200 Hz ---------------------------------------------------------------------
Instructions
NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/1999kw4/raw/POINTING:
OSOD and predicts will be on aardvark: 1999 KW4 /export/data3/osod/ops/a66391/EPH.OUT.s??? /export/data3/osod/ops/a66391/PRDX.OUT.14v-14-14.s??? /export/data3/osod/ops/a66391/PRDX.OUT.14f-14-14.s??? /export/data3/osod/ops/a66391/PUNCH.OUT.14v-14-14.s??? /export/data3/osod/ops/a66391/PUNCH.OUT.14f-14-14.s???
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 https://echo.jpl.nasa.gov/asteroids/1999KW4/1999KW4_planning.2019.html
Asteroid Radar Astronomy