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
2021-10-21 04:33:56 s 1 -129169.03 3 +293962.40 920.0 C57
2021-10-21 04:53:56 S 02 58 07.778 +24 23 52.91 V C57
2021-10-21 04:53:56 s 1 -129733.30 7 +293116.72 4120.0 C57
2021-10-21 05:03:56 S 02 58 08.110 +24 23 57.84 V C57
2021-10-21 05:03:56 s 1 -130014.62 2 +292692.01 2700.0 C57
2021-10-21 05:13:56 S 02 58 08.417 +24 23 59.89 V C57
2021-10-21 05:13:56 s 1 -130295.38 6 +292266.05 9260.0 C57
2021-10-21 05:23:56 S 02 58 08.549 +24 24 07.24 V C57
2021-10-21 05:23:56 s 1 -130575.59 6 +291838.84 3780.0 C57
2021-10-21 05:33:56 S 02 58 08.762 +24 24 09.40 V C57
2021-10-21 05:33:56 s 1 -130855.25 0 +291410.38 6260.0 C57
2021-10-21 05:43:56 S 02 58 08.998 +24 24 14.26 V C57
2021-10-21 05:43:56 s 1 -131134.34 5 +290980.66 6690.0 C57
2021-10-21 05:53:56 S 02 58 09.305 +24 24 17.24 V C57
2021-10-21 05:53:56 s 1 -131412.87 9 +290549.69 5060.0 C57
2021-10-21 06:03:56 S 02 58 09.437 +24 24 22.97 V C57
2021-10-21 06:03:56 s 1 -131690.84 8 +290117.47 1350.0 C57
2021-10-21 06:13:56 S 02 58 09.698 +24 24 25.70 V C57
2021-10-21 06:13:56 s 1 -131968.25 1 +289683.99 5570.0 C57
2021-10-21 06:23:56 S 02 58 09.972 +24 24 27.90 V C57
2021-10-21 06:23:56 s 1 -132245.08 6 +289249.26 7700.0 C57
2021-10-21 06:33:56 S 02 58 10.229 +24 24 32.62 V C57
2021-10-21 06:33:56 s 1 -132521.34 8 +288813.27 7740.0 C57
2021-10-21 06:43:56 S 02 58 10.474 +24 24 37.26 V C57
2021-10-21 06:43:56 s 1 -132797.03 6 +288376.01 5670.0 C57
2021-10-21 06:53:56 S 02 58 10.685 +24 24 40.68 V C57
2021-10-21 06:53:56 s 1 -133072.14 7 +287937.50 1480.0 C57
2021-10-21 07:03:56 S 02 58 10.985 +24 24 45.40 V C57
2021-10-21 07:03:56 s 1 -133346.67 9 +287497.73 5170.0 C57
2021-10-21 07:13:56 S 02 58 11.237 +24 24 48.38 V C57
2021-10-21 07:13:56 s 1 -133620.62 8 +287056.69 6730.0 C57
2021-10-21 07:23:56 S 02 58 11.352 +24 24 52.13 V C57
2021-10-21 07:23:56 s 1 -133893.99 2 +286614.39 6150.0 C57
2021-10-21 07:33:56 S 02 58 11.767 +24 24 56.74 V C57
2021-10-21 07:33:56 s 1 -134166.76 9 +286170.82 3410.0 C57
2021-10-21 07:43:56 S 02 58 11.974 +24 24 59.44 V C57
2021-10-21 07:43:56 s 1 -134438.95 6 +285725.99 8510.0 C57
2021-10-21 07:53:56 S 02 58 12.144 +24 25 02.24 V C57
2021-10-21 07:53:56 s 1 -134710.55 0 +285279.89 1440.0 C57
2021-10-21 08:03:56 S 02 58 12.317 +24 25 06.60 V C57
2021-10-21 08:03:56 s 1 -134981.54 8 +284832.52 2190.0 C57
2021-10-21 08:13:56 S 02 58 12.650 +24 25 11.06 V C57
2021-10-21 08:13:56 s 1 -135251.94 7 +284383.88 750.0 C57
2021-10-21 08:23:56 S 02 58 12.931 +24 25 14.74 V C57
2021-10-21 08:23:56 s 1 -135521.74 6 +283933.96 7110.0 C57
2021-10-21 08:33:56 S 02 58 13.210 +24 25 19.52 V C57
2021-10-21 08:33:56 s 1 -135790.94 1 +283482.78 1260.0 C57
2021-10-21 08:43:56 S 02 58 13.392 +24 25 23.81 V C57
2021-10-21 08:43:56 s 1 -136059.52 9 +283030.32 3190.0 C57
2021-10-21 08:53:56 S 02 58 13.567 +24 25 26.69 V C57
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)