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
2021-10-20 15:53:56 S 02 57 50.770 +24 18 56.34 V C57
2021-10-20 15:53:56 s 1 -106282.01 8 +322485.69 630.0 C57
2021-10-20 16:03:56 S 02 57 51.038 +24 19 00.95 V C57
2021-10-20 16:03:56 s 1 -106599.39 8 +322155.13 2860.0 C57
2021-10-20 16:13:56 S 02 57 51.247 +24 19 04.30 V C57
2021-10-20 16:13:56 s 1 -106916.39 5 +321823.40 3650.0 C57
2021-10-20 16:23:56 S 02 57 51.418 +24 19 08.33 V C57
2021-10-20 16:23:56 s 1 -107233.00 5 +321490.49 2990.0 C57
2021-10-20 16:33:56 S 02 57 51.559 +24 19 11.46 V C57
2021-10-20 16:33:56 s 1 -107549.22 6 +321156.42 880.0 C57
2021-10-20 16:43:56 S 02 57 51.749 +24 19 13.73 V C57
2021-10-20 16:43:56 s 1 -107865.05 8 +320821.17 7310.0 C57
2021-10-20 16:53:56 S 02 57 51.994 +24 19 18.44 V C57
2021-10-20 16:53:56 s 1 -108180.49 8 +320484.75 2270.0 C57
2021-10-20 17:03:56 S 02 57 52.320 +24 19 23.12 V C57
2021-10-20 17:03:56 s 1 -108495.54 4 +320147.15 5760.0 C57
2021-10-20 17:13:56 S 02 57 52.428 +24 19 27.52 V C57
2021-10-20 17:13:56 s 1 -108810.19 5 +319808.38 7780.0 C57
2021-10-20 17:23:56 S 02 57 52.678 +24 19 30.14 V C57
2021-10-20 17:23:56 s 1 -109124.44 8 +319468.43 8300.0 C57
2021-10-20 17:33:56 S 02 57 52.793 +24 19 33.49 V C57
2021-10-20 17:33:56 s 1 -109438.30 2 +319127.30 7340.0 C57
2021-10-20 17:43:56 S 02 57 53.026 +24 19 36.26 V C57
2021-10-20 17:43:56 s 1 -109751.75 4 +318785.00 4870.0 C57
2021-10-20 17:53:56 S 02 57 53.263 +24 19 42.31 V C57
2021-10-20 17:53:56 s 1 -110064.80 4 +318441.51 900.0 C57
2021-10-20 18:03:56 S 02 57 53.474 +24 19 45.59 V C57
2021-10-20 18:03:56 s 1 -110377.44 8 +318096.85 5420.0 C57
2021-10-20 18:13:56 S 02 57 53.575 +24 19 48.14 V C57
2021-10-20 18:13:56 s 1 -110689.68 6 +317751.01 8420.0 C57
2021-10-20 18:23:56 S 02 57 53.743 +24 19 54.23 V C57
2021-10-20 18:23:56 s 1 -111001.51 5 +317403.98 9900.0 C57
2021-10-20 18:33:56 S 02 57 54.041 +24 19 56.96 V C57
2021-10-20 18:33:56 s 1 -111312.93 3 +317055.77 9840.0 C57
2021-10-20 18:43:56 S 02 57 54.209 +24 20 00.53 V C57
2021-10-20 18:43:56 s 1 -111623.93 8 +316706.38 8240.0 C57
2021-10-20 18:53:56 S 02 57 54.559 +24 20 06.36 V C57
2021-10-20 18:53:56 s 1 -111934.52 9 +316355.80 5100.0 C57
2021-10-20 19:03:56 S 02 57 54.686 +24 20 08.70 V C57
2021-10-20 19:03:56 s 1 -112244.70 3 +316004.04 400.0 C57
2021-10-20 19:13:56 S 02 57 54.878 +24 20 12.16 V C57
2021-10-20 19:13:56 s 1 -112554.45 9 +315651.09 4150.0 C57
2021-10-20 19:23:56 S 02 57 55.224 +24 20 16.01 V C57
2021-10-20 19:23:56 s 1 -112863.79 4 +315296.96 6330.0 C57
2021-10-20 19:33:56 S 02 57 55.265 +24 20 20.47 V C57
2021-10-20 19:33:56 s 1 -113172.70 7 +314941.63 6930.0 C57
2021-10-20 19:43:56 S 02 57 55.546 +24 20 23.82 V C57
2021-10-20 19:43:56 s 1 -113481.19 6 +314585.12 5960.0 C57
2021-10-20 19:53:56 S 02 57 55.807 +24 20 28.00 V C57
2021-10-20 19:53:56 s 1 -113789.25 8 +314227.42 3400.0 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)