4660 Nereus (1982 DB)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3587886891 ± 2.00e+00
Semi-major axis (a)1.4849968052 AU ± 3.00e+00
Inclination (i)1.45355249° ± 4.00e+00
Long. of Asc. Node (Ω)313.11069488° ± 5.00e+00
Arg. of Perihelion (ω)159.53855352° ± 6.00e+00
Mean Anomaly (M)49.81856302° ± 6.30e-04
Mean Motion (n)0.5446581382°/day ± 1.65e+00
Perihelion dist (q)0.95219675 AU ± 3.54e+00
Aphelion dist (Q)2.01779686 AU ± 5.04e+00
Orbital Period1.80962371 yr ± 5.48e+00
NGA Modelr2
A2-4.68169994e-04 AU/d²
Physical Parameters
H (abs. magnitude)18.75
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual4.495″
Uncertainty0
Orbit TypeApollo
MOID0.004051 AU
Observations Used4486
Radar Obs Used28
Oppositions9
Arc Total1981-2002
First Observation Used1990-09-16
Last Observation Used2024-01-02
Observations (7063)
Date Type RA Dec Mag Band Observatory
2001-10-17 05:58:18 C 01 25 38.10 +15 24 24.9 17.1 c 704
2001-10-17 06:09:58 C 01 25 37.24 +15 24 24.4 17.3 c 704
2001-10-17 06:20:44 C 01 25 36.40 +15 24 22.9 17.4 c 704
2001-10-17 06:32:17 C 01 25 35.55 +15 24 22.6 17.5 c 704
2001-10-17 06:43:21 C 01 25 34.69 +15 24 20.8 17.5 c 704
2001-10-17 06:54:54 C 01 25 33.85 +15 24 20.6 17.4 c 704
2001-10-17 07:05:39 C 01 25 33.02 +15 24 18.6 17.4 c 704
2001-10-17 07:17:51 C 01 25 32.13 +15 24 18.6 17.5 c 704
2001-10-17 07:28:37 C 01 25 31.30 +15 24 16.3 17.5 c 704
2001-10-17 18:59:49 C 01 24 45.73 +15 23 00.3 c 185
2001-10-17 19:03:25 C 01 24 45.43 +15 23 00.2 c 185
2001-10-17 19:07:59 C 01 24 45.15 +15 22 59.7 c 185
2001-10-17 19:11:29 C 01 24 44.91 +15 22 59.3 c 185
2001-10-17 19:14:30 C 01 24 44.68 +15 22 59.2 c 185
2001-10-17 19:41:00 C 01 24 42.77 +15 22 58.6 c 104
2001-10-17 19:49:01 C 01 24 42.18 +15 22 57.8 c 104
2001-10-17 19:57:31 C 01 24 41.55 +15 22 56.9 c 104
2001-10-20 10:43:52 C 01 20 08.34 +15 15 32.8 17.1 d 644
2001-10-20 11:14:26 C 01 20 05.92 +15 15 27.8 17.2 d 644
2001-10-20 11:45:10 C 01 20 03.52 +15 15 22.8 17.2 d 644
2001-10-21 05:58:00 C 01 18 42.88 +15 12 50.9 17.0 c 704
2001-10-21 06:21:20 C 01 18 40.91 +15 12 47.8 17.4 c 704
2001-10-21 06:46:58 C 01 18 38.74 +15 12 43.6 17.2 c 704
2001-10-21 07:10:54 C 01 18 36.72 +15 12 40.0 17.1 c 704
2001-10-21 07:34:33 C 01 18 34.70 +15 12 36.3 16.9 c 704
2001-10-21 20:28:03 C 01 17 36.52 +15 10 30.4 151
2001-10-21 20:29:34 C 01 17 36.41 +15 10 30.5 151
2001-10-21 20:32:13 C 01 17 36.17 +15 10 30.0 151
2001-10-21 20:35:51 C 01 17 35.88 +15 10 29.5 151
2001-10-22 19:50:00 C 01 15 46.64 +15 06 42.7 610
2001-10-22 19:54:01 C 01 15 46.30 +15 06 42.2 610
2001-10-22 19:58:01 C 01 15 45.96 +15 06 41.7 610
2001-10-22 20:02:00 C 01 15 45.61 +15 06 41.2 610
2001-10-22 20:06:00 C 01 15 45.27 +15 06 40.7 610
2001-10-23 06:58:22 C 01 14 52.25 +15 04 55.0 c 670
2001-10-26 18:38:36 C 01 07 55.76 +14 48 09.9 d 151
2001-10-26 18:40:18 C 01 07 55.62 +14 48 08.7 d 151
2001-10-26 18:46:42 C 01 07 55.09 +14 48 08.0 d 151
2001-10-26 18:50:44 C 01 07 54.68 +14 48 07.7 d 151
2001-11-03 09:51:37 C 00 51 23.83 +13 59 55.8 17.1 c 644
2001-11-03 10:22:09 C 00 51 20.89 +13 59 45.6 17.0 c 644
2001-11-03 11:05:48 C 00 51 16.72 +13 59 31.0 16.9 c 644
2001-11-03 20:43:33 C 00 50 25.79 +13 56 32.2 151
2001-11-03 20:46:39 C 00 50 25.45 +13 56 31.1 151
2001-11-03 20:49:31 C 00 50 25.17 +13 56 30.1 151
2001-11-03 20:54:22 C 00 50 24.67 +13 56 28.8 151
2001-11-04 02:59:41 C 00 49 51.27 +13 54 41.1 d 739
2001-11-04 03:04:30 C 00 49 50.79 +13 54 39.9 d 739
2001-11-04 03:10:29 C 00 49 50.13 +13 54 37.9 d 739
2001-11-04 03:16:31 C 00 49 49.55 +13 54 36.1 d 739
Radar Observations (65)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2001-12-18.903472 108380755 10 us 2380 251 251
2001-12-20 22:54:00 103240786.97 0.5 us 2380 -1 -1
2001-12-20 22:54:00 68384.732 0.05 Hz 2380 -1 -1
2001-12-20.953472 1032425114 40 us 2380 251 251
2001-12-20.954167 10324078697 500 us 2380 251 251
2002-01-09 19:59:00 49784606.55 0.2 us 2380 -1 -1
2002-01-09 19:59:00 70245.997 0.04 Hz 2380 -1 -1
2002-01-09.781944 499160290 40 us 2380 251 251
2002-01-09.832639 4978460655 200 us 2380 251 251
2002-01-10 19:43:00 47273046.72 0.2 us 2380 -1 -1
2002-01-10 19:43:00 68613.43 0.04 Hz 2380 -1 -1
2002-01-10.818750 472799725 15 us 2380 251 251
2002-01-10.821528 4727304672 200 us 2380 251 251
2002-01-11 19:25:00 44835004.39 0.2 us 2380 -1 -1
2002-01-11 19:25:00 66627.953 0.04 Hz 2380 -1 -1
2002-01-11.770833 6841778 20 Hz 2380 251 251
2002-01-11.775000 4491829868 150 us 2380 251 251
2002-01-11.809028 4483500439 200 us 2380 251 251
2002-01-12 19:28:00 42448308.76 0.2 us 2380 -1 -1
2002-01-12 19:28:00 63457.452 0.04 Hz 2380 -1 -1
2002-01-12.811111 4244830876 200 us 2380 251 251
2002-01-13 18:30:00 40261557.21 0.2 us 2380 -1 -1
2002-01-13 18:30:00 61739.104 0.04 Hz 2380 -1 -1
2002-01-13.770833 4026155721 200 us 2380 251 251
2002-01-15 20:00:00 35994854.28 0.125 us 8560 -14 -14
2002-01-15 20:00:00 197405.524 0.25 Hz 8560 -14 -14
2002-01-15.770833 361220880 10 us 8560 253 253
2002-01-15.833333 3599485428 125 us 8560 253 253
2002-01-18 22:10:00 31139422.22 0.125 us 8560 -14 -14
2002-01-18 22:10:00 107757.4 0.25 Hz 8560 -14 -14
2002-01-18.833333 312442756 5 us 8560 253 253
2002-01-18.923611 3113942222 125 us 8560 253 253
2002-01-19 20:00:00 30181330.16 0.125 us 8560 -14 -14
2002-01-19 20:00:00 90610.817 0.125 Hz 8560 -14 -14
2002-01-19.000000 3106051265 50 us 8560 253 253
2002-01-19.729167 3028562883 50 us 8560 253 253
2002-01-19.833333 3018133016 125 us 8560 253 253
2002-01-20 21:20:00 29403320.46 0.125 us 8560 -14 -14
2002-01-20 21:20:00 46520.417 0.125 Hz 8560 -14 -14
2002-01-20.888889 2940332046 125 us 8560 253 253
2002-01-23 17:50:00 29202712.48 0.125 us 8560 -14 -14
2002-01-23 17:50:00 -39949.313 0.125 Hz 8560 -14 -14
2002-01-23.743056 2920271248 125 us 8560 253 253
2002-01-23.819444 292384970 5 us 8560 253 253
2002-01-24 16:20:00 29752549.35 0.125 us 8560 -14 -14
2002-01-24 16:20:00 -64888.574 0.125 Hz 8560 -14 -14
2002-01-24.680556 2975254935 125 us 8560 253 253
2002-01-25 17:50:00 30706982.46 0.125 us 8560 -14 -14
2002-01-25 17:50:00 -107448.878 0.125 Hz 8560 -14 -14
2002-01-25.743056 3070698246 125 us 8560 253 253
2002-01-26 16:30:00 31828818.7 0.125 us 8560 -14 -14
2002-01-26 16:30:00 -127522.95 0.125 Hz 8560 -14 -14
2002-01-26.687500 3182881870 125 us 8560 253 253
2002-01-27 16:50:00 33282611.95 0.125 us 8560 -14 -14
2002-01-27 16:50:00 -155058.598 0.125 Hz 8560 -14 -14
2002-01-27.701389 3328261195 125 us 8560 253 253
2002-01-29 16:50:00 36769265.89 0.125 us 8560 -14 -14
2002-01-29 16:50:00 -194945.298 0.125 Hz 8560 -14 -14
2002-01-29.701389 3676926589 125 us 8560 253 253
2002-01-29.763889 3689491563 50 us 8560 253 253
2021-11-29 08:00:00 53941354.495 2 us 8560 -14 -14
2021-11-30 09:20:00 50332716.46 1 us 8560 -14 -14
2021-12-07 06:20:00 30890699 1 us 8560 -14 -14
2021-12-15 10:00:00 29934898 1 us 8560 -14 -14
2021-12-15 23:10:00 -171136.057 1.15 Hz 7159.45 -47 -43
Station codes
-47 DSS-47 ATCA (W196) -43 DSS-43 Tidbinbilla (70-m) -14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)