Goldstone Radar Observations Planning: 2018 PK21
2018 PK21 was discovered by Pan-STARRS 1 on 2018 August 11. This diminutive asteroid has an absolute magnitude of 25.9, suggesting a diameter of roughly 20 meters, and a rotation period of about 0.6 hours (N. Moskovitz and M. Devogele, pers. comm.). Spectroscopy obtained by Moskovitz and Devogele suggests that this asteroid is either a Q- or T-type, and their photometry hints at possible non-principal axis rotation. This asteroid is a possible target for NASA's NEA Scout cubesat mission that may launch in 2021. NEA Scout is a tiny spacecraft propelled by a solar sail. This asteroid will approach within 0.031 au on 2020 December 8 and we are expecting weak SNRs at Goldstone that may be on the edge of detection due to the distance and small diameter. Our principal objective is to obtain a CW detection and a Doppler correction to the ephemeris, which has significant uncertainties. The SNRs at Arecibo would be much stronger and sufficient for CW observations and ranging, but due to cable failures in August and November, 2020, Arecibo observations of this asteroid will not be possible. Observations at Goldstone are scheduled on a number of dates between 2020 Dec 2 - 12. Additional photometry would be very helpful to improve constraints on the spin state, but obtaining it will be challenging because 2018 PK21 will brighten to only about 21st magnitude in late November and early December. Optical astrometry would also be valuable to reduce the uncertainties, which could be very helpful for mission navigation. The 2020 Earth flyby is the closest by this asteroid until 2059 when it will approach within 0.023 au. This object is on the NHATS list.
Orbital and Physical Characteristics Name 2018 PK21 Asteroid number Not numbered Discoverer Pan-STARRS 1 Discovery date 2018 Aug 11 orbit type Aten Close approach dist. 0.0313 au Close approach dist. 12.2 lunar distances Close approach date 2020 Dec 8 semimajor axis 0.988 au eccentricity 0.080 inclination 1.2 deg Orbital period 0.982 years perihelion distance 0.908 au aphelion distance 1.067 au MOID 0.0066 au absolute magnitude (H) 25.9 diameter ~20 meters optical albedo unknown rotation period 0.6 h Devogele and Moskovitz, pers. comm. lightcurve amplitude ? pole direction possibly tumbling spectral class Q or T (?) PHA? No Last update: 2020 December 10
2018 PK21 https://www.minorplanetcenter.net/mpec/K18/K18PA4.html
Goldstone SNRs SNRs assume Ptx = 450 kW and D = 20 meters, P = 0.6 h, radar albedo = 0.2, Tsys = 17 K. wk DOY start date window RA, dec dist runs SNR/day SNR/run 48 328 2020 Nov 23 06:38-19:28 142, +44 0.040 579 4 <1 48 329 2020 Nov 24 06:47-19:35 145, +44 0.039 593 4 <1 48 330 2020 Nov 25 06:57-19:42 148, +43 0.038 606 4 <1 48 331 2020 Nov 26 07:07-19:49 151, +43 0.037 618 5 <1 48 332 2020 Nov 27 07:18-19:56 154, +42 0.036 630 5 <1 48 333 2020 Nov 28 07:29-20:03 158, +41 0.035 640 6 <1 48 334 2020 Nov 29 07:41-20:09 161, +40 0.034 649 6 <1 49 335 2020 Nov 30 07:54-20:15 164, +39 0.034 657 7 <1 49 336 2020 Dec 01 08:07-20:21 168, +38 0.033 662 7 <1 49 337 2020 Dec 02 08:20-20:27 171, +37 0.033 666 8 <1 49 338 2020 Dec 03 08:34-20:32 174, +35 0.032 667 8 <1 Scheduled 49 339 2020 Dec 04 08:48-20:37 178, +34 0.032 666 8 <1 49 340 2020 Dec 05 09:02-20:41 181, +32 0.032 663 9 <1 Scheduled 49 341 2020 Dec 06 09:15-20:45 184, +30 0.031 657 9 <1 50 342 2020 Dec 07 09:29-20:48 187, +28 0.031 650 9 <1 Scheduled 50 343 2020 Dec 08 09:42-20:51 190, +26 0.031 639 9 <1 Scheduled 50 344 2020 Dec 09 09:55-20:53 193, +24 0.031 627 9 <1 Scheduled 50 345 2020 Dec 10 10:08-20:55 196, +22 0.032 613 8 <1 Scheduled 50 346 2020 Dec 11 10:20-20:56 199, +20 0.032 597 8 <1 Scheduled 50 347 2020 Dec 12 10:32-20:56 201, +18 0.032 580 8 <1 Scheduled 50 348 2020 Dec 13 10:44-20:57 204, +16 0.033 562 7 <1 51 349 2020 Dec 14 10:55-20:57 206, +14 0.033 542 7 <1 51 350 2020 Dec 15 11:05-20:56 208, +12 0.034 522 6 <1 51 351 2020 Dec 16 11:15-20:55 210, +10 0.035 502 6 <1 51 352 2020 Dec 17 11:25-20:54 212, +8 0.035 482 5 <1 51 353 2020 Dec 18 11:34-20:53 214, +6 0.036 462 5 <1 51 354 2020 Dec 19 11:43-20:51 216, +4 0.037 442 4 <1 51 355 2020 Dec 20 11:51-20:49 218, +3 0.038 422 4 <1 Both klystrons and full power will be available for these observations. Note that SNRs above assume a radar albedo = 0.2. 2018 PK21 ARECIBO SNRs start date window RA, dec dist runs SNR/day SNR/run 2020 Dec 02 10:32-11:34 171, +37 0.033 57 16 2 2020 Dec 03 10:28-11:57 174, +35 0.032 83 24 3 2020 Dec 04 10:27-12:17 177, +34 0.032 105 33 4 2020 Dec 05 10:28-12:34 181, +32 0.032 121 40 4 2020 Dec 06 10:31-12:49 184, +30 0.031 133 44 4 2020 Dec 07 10:34-13:03 187, +28 0.031 143 48 4 2020 Dec 08 10:38-13:14 190, +26 0.031 150 49 4 2020 Dec 09 10:43-13:25 193, +24 0.031 156 50 4 2020 Dec 10 10:48-13:34 196, +22 0.032 159 50 4 2020 Dec 11 10:54-13:41 198, +20 0.032 160 48 4 2020 Dec 12 11:01-13:47 201, +18 0.032 146 45 4 2020 Dec 13 11:08-13:52 203, +16 0.033 153 43 4 2020 Dec 14 11:15-13:56 206, +14 0.033 145 40 4 2020 Dec 15 11:23-13:58 208, +12 0.034 140 36 3 2020 Dec 16 11:31-13:59 210, +10 0.034 130 32 3 2020 Dec 17 11:40-13:59 212, +8 0.035 118 28 3 2020 Dec 18 11:49-13:57 214, +6 0.036 106 24 3 2020 Dec 19 11:59-13:54 216, +5 0.037 95 20 2 2020 Dec 20 12:10-13:49 218, +3 0.038 80 15 2 2020 Dec 21 12:23-13:42 219, +1 0.039 60 10 2 Arecibo SNRs assume Ptx = 800 kW, Gain = 7 K/Jy, radar albedo = 0.2, and P = 0.6 h. Arecibo is offline due to failure of an auxiliary cable in August, 2020, and failure of a main cable in November, 2020. Radar observations of 2018 PK21 will not be possible at Arecibo in 2020.
Track Assignments
DOY BOA BOT EOT EOA 337 1040 1210 1315 1345 AST 2018 PK21 Very short track; changed to engineering tests 338 0945 1115 1330 1400 AST 2018 PK21 340 1215 1345 1645 1715 AST 2018 PK21 Trouble with high elevations: changed to engineering tests 342 0850 1020 1310 1340 AST 2018 PK21 343 0920 1050 1255 1325 AST 2018 PK21 344 0920 1050 1415 1445 AST 2018 PK21 345 0925 1055 1530 1600 AST 2018 PK21 346 0840 1010 1615 1645 AST 2018 PK21 347 0150 0320 0510 0540 AST RYUGU 347 0905 1035 1255 1325 AST 2018 PK21 Goldstone tracks: UT UT PST Duration Round-trip DOY Date Target TX Window TX Window hh:mm time (sec) observer 337 Dec 02 2018 PK21 1210-1315 0410-0515 Dec 02 1:05 33 Too short; changed to engineering tests 338 Dec 03 2018 PK21 1115-1330 0315-0530 Dec 03 2:15 32 SN el > 75 deg in last 10 minutes 339 Dec 04 ...not scheduled... 340 Dec 05 2018 PK21 1345-1645 0545-0845 Dec 04 3:00 32 SN el > 75 deg from 1340-1603. Changed to engineering tests. 341 Dec 06 ...not scheduled... 342 Dec 07 2018 PK21 1020-1310 0220-0510 Dec 07 2:50 31 SN 343 Dec 08 2018 PK21 1050-1255 0250-0455 Dec 08 2:05 31 LB 344 Dec 09 2018 PK21 1050-1415 0250-0615 Dec 09 3:25 31 LB 345 Dec 10 2018 PK21 1055-1530 0255-0730 Dec 10 4:35 32 LB el > 75 deg during last 30 minutes 346 Dec 11 2018 PK21 1020-1615 0220-0815 Dec 11 5:55 32 MB Changed to engineering tests 347 Dec 12 Ryugu 0320-0510 1920-2110 Dec 11 1:50 70 MB First Ryugu track 347 Dec 12 2018 PK21 1035-1255 0325-0455 Dec 12 1:30 32 MB Changed to engineering tests Arecibo tracks: UT UT PST Round-trip Date TX Window TX Window time (sec) ...Observations at Arecibo will not be possible...
Uncertainties
2018 PK21 JPL/Horizons solution 29, # obs: 112 (2018-2020) 2020 Nov 22 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2020-Nov-28 00:00 *m 155.64185 41.52300 0.03564879631265 2.372 2.24 8.15 0.002873 2020-Nov-29 00:00 *m 158.93530 40.68607 0.03487278452268 2.532 2.18 7.92 0.002796 2020-Nov-30 00:00 * 162.26973 39.71843 0.03416275274819 2.695 2.11 7.67 0.002722 2020-Dec-01 00:00 * 165.62780 38.61617 0.03352259893983 2.857 2.03 7.39 0.002651 2020-Dec-02 00:00 * 168.99131 37.37772 0.03295620857949 3.016 1.95 7.08 0.002583 2020-Dec-03 00:00 * 172.34183 36.00428 0.03246736679959 3.167 1.85 6.74 0.002518 2020-Dec-04 00:00 * 175.66138 34.50000 0.03205965889905 3.306 1.75 6.37 0.002458 2020-Dec-05 00:00 * 178.93304 32.87216 0.03173636357145 3.431 1.64 5.95 0.002402 2020-Dec-06 00:00 * 182.14146 31.13102 0.03150034510501 3.538 1.51 5.50 0.002350 2020-Dec-07 00:00 * 185.27326 29.28964 0.03135395243481 3.624 1.38 5.00 0.002303 2020-Dec-08 00:00 * 188.31726 27.36340 0.03129893378794 3.685 1.23 4.47 0.002262 2020-Dec-09 00:00 * 191.26462 25.36947 0.03133637535017 3.721 1.07 3.90 0.002227 2020-Dec-10 00:00 * 194.10875 23.32606 0.03146667061349 3.731 0.91 3.31 0.002197 2020-Dec-11 00:00 * 196.84523 21.25175 0.03168952378975 3.715 0.74 2.70 0.002174 2020-Dec-12 00:00 * 199.47162 19.16476 0.03200398624310 3.674 0.58 2.10 0.002158 2020-Dec-13 00:00 * 201.98720 17.08227 0.03240852021569 3.610 0.43 1.55 0.002148 2020-Dec-14 00:00 *m 204.39273 15.01996 0.03290108066826 3.526 0.32 1.17 0.002144 2020-Dec-15 00:00 *m 206.69026 12.99161 0.03347920526865 3.424 0.32 1.15 0.002148 - - - - - - - - - - JPL/Horizons solution 28, # obs: 109 (2018-2020) 2020 Nov 17 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2020-Nov-28 00:00 155.67372 41.58610 0.03564162826581 3.234 2.78 10.10 0.003495 2020-Nov-29 00:00 158.97018 40.74973 0.03486551316311 3.446 2.70 9.81 0.003397 2020-Nov-30 00:00 162.30756 39.78247 0.03415535231032 3.658 2.61 9.49 0.003303 2020-Dec-01 00:00 165.66846 38.68037 0.03351504355666 3.866 2.52 9.14 0.003212 2020-Dec-02 00:00 169.03460 37.44189 0.03294847268493 4.067 2.41 8.76 0.003125 2020-Dec-03 00:00 172.38753 36.06819 0.03245942556840 4.256 2.29 8.34 0.003042 2020-Dec-04 00:00 175.70923 34.56345 0.03205148870391 4.427 2.17 7.87 0.002964 2020-Dec-05 00:00 178.98274 32.93492 0.03172794243097 4.576 2.03 7.36 0.002891 2020-Dec-06 00:00 182.19270 31.19289 0.03149165309229 4.700 1.87 6.80 0.002824 2020-Dec-07 00:00 185.32571 29.35043 0.03134497201543 4.794 1.70 6.19 0.002763 2020-Dec-08 00:00 188.37062 27.42294 0.03128965005932 4.855 1.52 5.53 0.002709 2020-Dec-09 00:00 191.31858 25.42760 0.03132677616201 4.883 1.33 4.83 0.002662 2020-Dec-10 00:00 194.16303 23.38266 0.03145674656057 4.875 1.13 4.10 0.002623 2020-Dec-11 00:00 196.89959 21.30671 0.03167926808290 4.834 0.92 3.35 0.002591 2020-Dec-12 00:00 199.52582 19.21799 0.03199339447861 4.761 0.72 2.61 0.002568 2020-Dec-13 00:00 202.04105 17.13372 0.03239759007502 4.658 0.53 1.92 0.002552 2020-Dec-14 00:00 204.44607 15.06959 0.03288981158519 4.530 0.39 1.42 0.002546 2020-Dec-15 00:00 206.74294 13.03941 0.03346759809831 4.381 0.37 1.36 0.002548 - - - - - - - - - - JPL/Horizons solution 26, # obs: 100 (2018-2019) 2020 Sep 17 Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta POS_3sigma DOP_S_3sig DOP_X_3sig RT_delay_3sig 2020-Nov-28 00:00 *m 155.64101 41.52372 0.03564848306726 9.056 4.41 16.04 0.006911 2020-Nov-29 00:00 *m 158.93450 40.68684 0.03487244618223 9.248 4.27 15.51 0.006776 2020-Nov-30 00:00 * 162.26897 39.71924 0.03416238807558 9.423 4.12 14.96 0.006650 2020-Dec-01 00:00 * 165.62710 38.61701 0.03352220678751 9.578 3.96 14.39 0.006534 2020-Dec-02 00:00 * 168.99066 37.37860 0.03295578792428 9.710 3.79 13.79 0.006427 2020-Dec-03 00:00 * 172.34124 36.00518 0.03246691677822 9.814 3.62 13.14 0.006331 2020-Dec-04 00:00 * 175.66086 34.50093 0.03205917884214 9.886 3.43 12.46 0.006246 2020-Dec-05 00:00 * 178.93259 32.87309 0.03173585303343 9.924 3.23 11.73 0.006172 2020-Dec-06 00:00 * 182.14108 31.13196 0.03149980388719 9.927 3.01 10.95 0.006110 2020-Dec-07 00:00 * 185.27295 29.29057 0.03135338059900 9.892 2.79 10.14 0.006060 2020-Dec-08 00:00 * 188.31702 27.36433 0.03129833165887 9.821 2.56 9.30 0.006022 2020-Dec-09 00:00 * 191.26444 25.37037 0.03133574350644 9.714 2.33 8.47 0.005997 2020-Dec-10 00:00 * 194.10864 23.32694 0.03146600986449 9.574 2.11 7.68 0.005985 2020-Dec-11 00:00 * 196.84518 21.25260 0.03168883514365 9.405 1.93 7.00 0.005985 2020-Dec-12 00:00 * 199.47163 19.16557 0.03200327086644 9.212 1.79 6.49 0.005998 2020-Dec-13 00:00 * 201.98726 17.08304 0.03240777938856 8.998 1.72 6.24 0.006024 2020-Dec-14 00:00 *m 204.39284 15.02068 0.03290031573838 8.768 1.73 6.31 0.006062 2020-Dec-15 00:00 *m 206.69041 12.99229 0.03347841760773 8.527 1.84 6.69 0.006113
2018 PK21 Apparent Magnitudes, Solar Elongations, Lunar Elongations, and Lunar Illumination: Date__(UT)__HR:MN R.A._(a-appar)_DEC. delta APmag S-brt S-O-T /r T-O-M/MN_Illu% 2020-Oct-20 00:00 87.17332 37.04656 0.09215439323581 22.876 n.a. 118.4734 /L 158.6/ 14.5491 2020-Oct-21 00:00 88.06586 37.33338 0.09035598424178 22.828 n.a. 118.6846 /L 166.3/ 23.6162 2020-Oct-22 00:00 88.97457 37.62136 0.08857023509938 22.780 n.a. 118.8849 /L 163.6/ 33.7294 2020-Oct-23 00:00 89.90089 37.91047 0.08679744841166 22.731 n.a. 119.0731 /L 154.1/ 44.2665 2020-Oct-24 00:00 90.84634 38.20067 0.08503786313748 22.682 n.a. 119.2482 /L 143.2/ 54.7096 2020-Oct-25 00:00 91.81253 38.49191 0.08329167651824 22.632 n.a. 119.4090 /L 132.1/ 64.6479 2020-Oct-26 00:00 92.80113 38.78409 0.08155906204532 22.583 n.a. 119.5544 /L 121.0/ 73.7607 2020-Oct-27 00:00 93.81392 39.07709 0.07984018316741 22.533 n.a. 119.6832 /L 110.1/ 81.7939 2020-Oct-28 00:00 94.85276 39.37077 0.07813520368201 22.483 n.a. 119.7940 /L 99.3/ 88.5417 2020-Oct-29 00:00 95.91964 39.66492 0.07644429610389 22.433 n.a. 119.8856 /L 88.7/ 93.8349 2020-Oct-30 00:00 97.01663 39.95929 0.07476764915268 22.382 n.a. 119.9566 /L 78.1/ 97.5371 2020-Oct-31 00:00 98.14595 40.25358 0.07310547514494 22.332 n.a. 120.0055 /L 67.6/ 99.5456 2020-Nov-01 00:00 99.30995 40.54743 0.07145801768848 22.282 n.a. 120.0308 /L 57.3/ 99.7960 2020-Nov-02 00:00 100.51108 40.84039 0.06982555975907 22.231 n.a. 120.0309 /L 47.1/ 98.2660 2020-Nov-03 00:00 101.75196 41.13192 0.06820843205280 22.181 n.a. 120.0042 /L 37.2/ 94.9786 2020-Nov-04 00:00 103.03536 41.42139 0.06660702147826 22.130 n.a. 119.9489 /L 28.0/ 90.0027 2020-Nov-05 00:00 104.36421 41.70806 0.06502177976883 22.080 n.a. 119.8632 /L 20.4/ 83.4521 2020-Nov-06 00:00 105.74159 41.99102 0.06345323239875 22.030 n.a. 119.7451 /L 17.2/ 75.4866 2020-Nov-07 00:00 107.17076 42.26922 0.06190198818387 21.980 n.a. 119.5926 /L 20.7/ 66.3166 2020-Nov-08 00:00 108.65516 42.54142 0.06036875002261 21.930 n.a. 119.4035 /L 28.8/ 56.2137 2020-Nov-09 00:00 110.19839 42.80617 0.05885432705385 21.881 n.a. 119.1755 /L 39.0/ 45.5284 2020-Nov-10 00:00 111.80423 43.06177 0.05735964794505 21.832 n.a. 118.9061 /L 50.2/ 34.7085 2020-Nov-11 00:00 113.47665 43.30623 0.05588577399963 21.784 n.a. 118.5928 /L 62.1/ 24.3122 2020-Nov-12 00:00 115.21978 43.53722 0.05443390941447 21.736 n.a. 118.2327 /L 74.6/ 14.9954 2020-Nov-13 00:00 117.03794 43.75203 0.05300540490851 21.690 n.a. 117.8229 /L 87.3/ 7.4590 2020-Nov-14 00:00 118.93559 43.94753 0.05160175121070 21.644 n.a. 117.3601 /L 100.2/ 2.3479 2020-Nov-15 00:00 120.91736 44.12010 0.05022456167555 21.599 n.a. 116.8408 /L 113.0/ 0.1220 2020-Nov-16 00:00 122.98790 44.26561 0.04887554832609 21.556 n.a. 116.2612 /L 125.3/ 0.9479 2020-Nov-17 00:00 125.15181 44.37935 0.04755650022846 21.515 n.a. 115.6172 /L 136.9/ 4.6639 2020-Nov-18 00:00 127.41344 44.45601 0.04626927364574 21.475 n.a. 114.9044 /L 147.0/ 10.8345 2020-Nov-19 00:00 129.77668 44.48965 0.04501579885430 21.438 n.a. 114.1183 /L 154.6/ 18.8668 2020-Nov-20 00:00 132.24468 44.47366 0.04379810184964 21.403 n.a. 113.2543 /L 157.9/ 28.1324 2020-Nov-21 00:00 134.81957 44.40082 0.04261833460476 21.371 n.a. 112.3077 /L 155.8/ 38.0548 2020-Nov-22 00:00 137.50219 44.26326 0.04147880675381 21.343 n.a. 111.2739 /L 150.0/ 48.1500 2020-Nov-23 00:00 140.29176 44.05255 0.04038201333823 21.318 n.a. 110.1485 /L 142.6/ 58.0290 2020-Nov-24 00:00 143.18562 43.75983 0.03933065553736 21.297 n.a. 108.9274 /L 134.5/ 67.3808 2020-Nov-25 00:00 146.17897 43.37595 0.03832765289090 21.282 n.a. 107.6067 /L 126.3/ 75.9488 2020-Nov-26 00:00 149.26470 42.89170 0.03737614619093 21.271 n.a. 106.1833 /L 118.0/ 83.5098 2020-Nov-27 00:00 152.43331 42.29811 0.03647949026054 21.267 n.a. 104.6549 /L 109.7/ 89.8600 2020-Nov-28 00:00 155.67291 41.58682 0.03564123560849 21.269 n.a. 103.0199 /L 101.5/ 94.8098 2020-Nov-29 00:00 158.96941 40.75050 0.03486509772990 21.279 n.a. 101.2785 /L 93.3/ 98.1857 2020-Nov-30 00:00 162.30683 39.78327 0.03415491279205 21.296 n.a. 99.4318 /L 85.1/ 99.8393 2020-Dec-01 00:00 165.66778 38.68121 0.03351457872645 21.322 n.a. 97.4830 /L 76.9/ 99.6593 2020-Dec-02 00:00 169.03398 37.44276 0.03294798143203 21.358 n.a. 95.4374 /L 68.8/ 97.5846 2020-Dec-03 00:00 172.38698 36.06909 0.03245890693268 21.403 n.a. 93.3021 /L 60.7/ 93.6156 2020-Dec-04 00:00 175.70874 34.56436 0.03205094190890 21.459 n.a. 91.0868 /L 52.6/ 87.8209 2020-Dec-05 00:00 178.98232 32.93584 0.03172736691288 21.527 n.a. 88.8034 /L 44.7/ 80.3429 2020-Dec-06 00:00 182.19234 31.19382 0.03149104852249 21.605 n.a. 86.4658 /L 37.1/ 71.4001 2020-Dec-07 00:00 185.32543 29.35135 0.03134433831376 21.695 n.a. 84.0900 /L 30.2/ 61.2929 2020-Dec-08 00:00 188.37040 27.42385 0.03128898739660 21.796 n.a. 81.6932 /L 24.8/ 50.4100 2020-Dec-09 00:00 191.31843 25.42849 0.03132608495074 21.909 n.a. 79.2936 /L 22.5/ 39.2368 2020-Dec-10 00:00 194.16294 23.38352 0.03145602743408 22.032 n.a. 76.9100 /L 24.6/ 28.3544 2020-Dec-11 00:00 196.89956 21.30754 0.03167852186448 22.165 n.a. 74.5606 /L 30.6/ 18.4194 2020-Dec-12 00:00 199.52585 19.21879 0.03199262214301 22.307 n.a. 72.2629 /L 39.0/ 10.1109 2020-Dec-13 00:00 202.04113 17.13447 0.03239679270566 22.456 n.a. 70.0327 /L 48.8/ 4.0429 2020-Dec-14 00:00 204.44619 15.07030 0.03288899033028 22.613 n.a. 67.8841 /L 59.3/ 0.6595 2020-Dec-15 00:00 206.74310 13.04007 0.03346675412932 22.774 n.a. 65.8289 /L 70.1/ 0.1504 2020-Dec-16 00:00 208.93495 11.05546 0.03412729592749 22.939 n.a. 63.8764 /L 81.0/ 2.4236 2020-Dec-17 00:00 211.02561 9.12599 0.03486758687589 23.106 n.a. 62.0335 /L 91.8/ 7.1476
Setups
Due the 0.6 h rotation period and a diameter of roughly 0.02 km, we are expecting a bandwidth of roughly 3 Hz. CW setup: --------------------------------------------------------------------------- TX polarization RCP RCV polarization LCP & RCP Frequency hops: no hopping Bandwidth: 5000 Hz TXoffset +500 Hz FFT 5000 for 1 Hz resolution Ranging setups: --------------------------------------------------------------------------- 10-usec baud 10 usec code 127 PRP 1270 usec ncoh 1 bandwidth 787 Hz FFT 128 resolution 6.15 Hz TXoffset +100 Hz (echo in column 80) --------------------------------------------------------------------------- 11-usec baud 11 usec code 127 PRP 1397 usec ncoh 1 bandwidth 716 Hz FFT 128 resolution 5.6 Hz TXoffset +100 Hz (echo in column 82) ------------------------------------------------------------------------- 1-usec baud 1 usec code 255 ncoh 16 bandwidth 245 Hz FFT 128 resolution 1.9 Hz TXoffset +50 Hz (echo in column 116) ---------------------------------------------------------------------
Instructions
NOTE: Data should be moved to the appropriate subdirectories in aardvark:/export/data0/2018pk21/raw/
POINTING:
OSOD and predicts are on aardvark: /export/data3/osod/ops/2018pk21/ EPH.OUT.s29 PRDX.OUT.14f-14-14.s29 PRDX.OUT.14v-14-14.s29 PUNCH.OUT.14f-14-14.s29 PUNCH.OUT.14v-14-14.s29 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-14-14.29 TRANSMITTER: STATION #14, RECEIVER: STATION #14 RECEIVER U.T. RANGE DOPPLER LHA DEC RA EL
2018 PK21 GOLDSTONE MASTERLOG
============================================================================== 2020 December 3 (DOY 338) Observer: Naidu Ptx = 440 kW <--- UTC ---> TX txsta txend Setup ncoh Code Bandwidth OSOD FFT delta f Offset Runs HHMMSS-HHMMSS CW - - 5000 Hz 29 2000 2.5 Hz +500 Hz 138 104706-133057 We processed the data at multiple finer and coarser resolutions but did not see an echo. ----------------------------------------------------- 2020 December 7 (DOY 342) Observer: Naidu Ptx = 440 kW <--- UTC ---> TX txsta txend Setup ncoh Code Bandwidth OSOD FFT delta f Offset Runs HHMMSS-HHMMSS CW - - 5000 Hz 29 2000 2.5 Hz +500 Hz 173 095522-131024 ----------------------------------------------------- 2020 December 8 (DOY 343) Observer: Benner Ptx = 440 kW <--- UTC ---> TX txsta txend Setup ncoh Code Bandwidth OSOD FFT delta f Offset Runs HHMMSS-HHMMSS CW - - 5000 Hz 29 2000 2.5 Hz +500 Hz 141 101504-125548 ----------------------------------------------------- 2020 December 9 (DOY 344) Observer: Benner Ptx = 440 kW <--- UTC ---> TX txsta txend Setup ncoh Code Bandwidth OSOD FFT delta f Offset Runs HHMMSS-HHMMSS CW - - 5000 Hz 29 2000 2.5 Hz +500 Hz 205 101034-141452 Candidate echo seen from a sum of all the CW data on four tracks. ----------------------------------------------------- 2020 December 10 (DOY 345) Observer: Benner Ptx = 440 kW <--- UTC ---> TX txsta txend Setup ncoh Code Bandwidth OSOD FFT delta f Offset Runs HHMMSS-HHMMSS CW - - 5000 Hz 29 2000 2.5 Hz +500 Hz 272 102122-153053 -----------------------------------------------------
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/2018PK21/2018pk21.2020.goldstone.planning.html
Asteroid Radar Astronomy