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
2001-11-21 02:10:14 C 00 14 14.90 +11 35 26.1 16.7 c 704
2001-11-21 02:31:30 C 00 14 12.97 +11 35 19.5 16.8 c 704
2001-11-21 02:52:32 C 00 14 11.11 +11 35 12.8 16.8 c 704
2001-11-21 03:13:33 C 00 14 09.22 +11 35 05.5 16.6 c 704
2001-11-24 01:47:15 C 00 09 01.26 +11 12 27.8 15.5 c 704
2001-11-24 02:08:13 C 00 08 59.52 +11 12 21.9 15.9 c 704
2001-11-24 02:29:14 C 00 08 57.77 +11 12 15.4 15.6 c 704
2001-11-24 02:50:13 C 00 08 56.02 +11 12 09.0 15.9 c 704
2001-11-24 03:11:12 C 00 08 54.27 +11 12 02.6 16.1 c 704
2001-11-25 02:02:00 C 00 07 20.36 +11 05 01.8 15.5 c 704
2001-11-25 02:04:58 C 00 07 20.12 +11 05 01.6 15.7 c 704
2001-11-25 02:18:26 C 00 07 19.03 +11 04 58.0 16.5 c 704
2001-11-25 02:23:09 C 00 07 18.65 +11 04 55.6 15.8 c 704
2001-11-25 02:28:15 C 00 07 18.24 +11 04 54.3 16.0 c 704
2001-11-25 02:39:32 C 00 07 17.29 +11 04 51.4 16.8 c 704
2001-11-25 02:44:14 C 00 07 16.93 +11 04 49.3 16.1 c 704
2001-11-25 02:49:39 C 00 07 16.48 +11 04 47.9 16.1 c 704
2001-11-25 03:00:37 C 00 07 15.55 +11 04 45.4 17.1 c 704
2001-11-25 03:05:19 C 00 07 15.20 +11 04 43.0 16.2 c 704
2001-12-01 11:34:22 C 23 57 41.83 +10 22 37.8 300
2001-12-01 11:41:36 C 23 57 41.27 +10 22 35.3 300
2001-12-07 18:06:59 C 23 49 40.66 +09 48 18.3 610
2001-12-07 18:11:00 C 23 49 40.41 +09 48 17.3 610
2001-12-07 18:15:00 C 23 49 40.16 +09 48 16.3 610
2001-12-07 18:18:59 C 23 49 39.91 +09 48 15.3 610
2001-12-07 18:22:59 C 23 49 39.66 +09 48 14.3 610
2001-12-10 02:18:44 C 23 46 54.18 +09 37 15.2 c 448
2001-12-10 02:25:43 C 23 46 53.73 +09 37 13.8 c 448
2001-12-10 02:33:01 C 23 46 53.25 +09 37 12.2 c 448
2001-12-11 01:40:42 C 23 45 47.08 +09 32 45.9 17.1 c 704
2001-12-11 02:03:02 C 23 45 45.65 +09 32 41.4 17.0 c 704
2001-12-11 02:25:21 C 23 45 44.19 +09 32 37.0 16.7 c 704
2001-12-11 02:47:39 C 23 45 42.77 +09 32 32.2 16.5 c 704
2001-12-11 03:10:01 C 23 45 41.35 +09 32 27.8 16.4 c 704
2001-12-15 19:16:01 C 23 40 19.63 +09 11 40.5 d 049
2001-12-15 19:36:27 C 23 40 18.46 +09 11 36.5 d 049
2001-12-15 19:58:38 C 23 40 17.19 +09 11 32.1 d 049
2001-12-25 01:46:32 C 23 27 44.16 +08 28 03.7 d 691
2001-12-25 02:07:26 C 23 27 42.21 +08 27 58.2 d 691
2001-12-25 02:29:22 C 23 27 40.18 +08 27 52.3 d 691
2001-12-30 17:06:02 C 23 15 45.40 +07 42 59.5 c 118
2001-12-30 17:07:49 C 23 15 45.16 +07 42 58.4 c 118
2001-12-30 17:31:18 C 23 15 42.10 +07 42 47.7 c 118
2002-01-02 17:16:54 C 23 06 32.72 +07 05 15.8 151
2002-01-02 17:21:14 C 23 06 31.98 +07 05 12.7 151
2002-01-02 17:24:37 C 23 06 31.43 +07 05 10.6 151
2002-01-02 17:27:46 C 23 06 30.90 +07 05 08.6 151
2002-01-04 18:10:07 C 22 58 34.89 +06 30 33.2 c 113
2002-01-04 18:11:49 C 22 58 34.53 +06 30 31.7 c 113
2002-01-04 18:13:31 C 22 58 34.21 +06 30 30.1 c 113
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)