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
2021-10-22 09:33:56 s 1 -167383.06 1 +200584.98 5530.0 C57
2021-10-22 09:43:56 S 02 58 57.353 +24 35 04.63 V C57
2021-10-22 09:43:56 s 1 -167518.95 9 +199924.90 9270.0 C57
2021-10-22 09:53:56 S 02 58 57.674 +24 35 08.38 V C57
2021-10-22 09:53:56 s 1 -167653.59 8 +199263.30 8530.0 C57
2021-10-22 10:03:56 S 02 58 57.989 +24 35 12.41 V C57
2021-10-22 10:03:56 s 1 -167786.97 3 +198600.20 3280.0 C57
2021-10-22 10:13:56 S 02 58 58.418 +24 35 15.86 V C57
2021-10-22 10:13:56 s 1 -167919.07 6 +197935.59 3500.0 C57
2021-10-22 10:23:56 S 02 58 58.934 +24 35 19.36 V C57
2021-10-22 10:23:56 s 1 -168049.90 1 +197269.46 9170.0 C57
2021-10-22 10:33:56 S 02 58 59.160 +24 35 22.38 V C57
2021-10-22 10:33:56 s 1 -168179.44 2 +196601.82 250.0 C57
2021-10-22 10:43:56 S 02 58 59.546 +24 35 28.03 V C57
2021-10-22 10:43:56 s 1 -168307.69 1 +195932.66 6730.0 C57
2021-10-22 10:53:56 S 02 58 59.755 +24 35 32.57 V C57
2021-10-22 10:53:56 s 1 -168434.64 1 +195261.98 8590.0 C57
2021-10-22 11:03:56 S 02 59 00.173 +24 35 38.51 V C57
2021-10-22 11:03:56 s 1 -168560.28 5 +194589.78 5790.0 C57
2021-10-22 11:13:56 S 02 59 00.446 +24 35 38.90 V C57
2021-10-22 11:13:56 s 1 -168684.61 7 +193916.06 8320.0 C57
2021-10-22 11:23:56 S 02 59 00.895 +24 35 43.26 V C57
2021-10-22 11:23:56 s 1 -168807.62 9 +193240.81 6150.0 C57
2021-10-22 11:33:56 S 02 59 01.274 +24 35 48.16 V C57
2021-10-22 11:33:56 s 1 -168929.31 5 +192564.04 9250.0 C57
2021-10-22 11:43:56 S 02 59 01.567 +24 35 51.11 V C57
2021-10-22 11:43:56 s 1 -169049.66 6 +191885.74 7610.0 C57
2021-10-22 11:53:56 S 02 59 01.920 +24 35 54.74 V C57
2021-10-22 11:53:56 s 1 -169168.67 7 +191205.92 1190.0 C57
2021-10-22 12:03:56 S 02 59 02.196 +24 35 59.03 V C57
2021-10-22 12:03:56 s 1 -169286.33 9 +190524.56 9970.0 C57
2021-10-22 12:13:56 S 02 59 02.712 +24 36 02.88 V C57
2021-10-22 12:13:56 s 1 -169402.64 5 +189841.67 3930.0 C57
2021-10-22 12:23:56 S 02 59 02.981 +24 36 08.35 V C57
2021-10-22 12:23:56 s 1 -169517.58 8 +189157.24 3030.0 C57
2021-10-22 12:33:56 S 02 59 03.430 +24 36 12.85 V C57
2021-10-22 12:33:56 s 1 -169631.16 1 +188471.28 7260.0 C57
2021-10-22 12:43:56 S 02 59 03.758 +24 36 16.24 V C57
2021-10-22 12:43:56 s 1 -169743.35 5 +187783.78 6590.0 C57
2021-10-22 12:53:56 S 02 59 04.159 +24 36 19.58 V C57
2021-10-22 12:53:56 s 1 -169854.16 4 +187094.73 1000.0 C57
2021-10-22 13:03:56 S 02 59 04.483 +24 36 23.80 V C57
2021-10-22 13:03:56 s 1 -169963.58 0 +186404.15 440.0 C57
2021-10-22 13:13:56 S 02 59 04.824 +24 36 27.83 V C57
2021-10-22 13:13:56 s 1 -170071.59 6 +185712.03 4910.0 C57
2021-10-22 13:23:56 S 02 59 05.230 +24 36 32.15 V C57
2021-10-22 13:23:56 s 1 -170178.20 3 +185018.36 4370.0 C57
2021-10-22 13:33:56 S 02 59 05.592 +24 36 34.92 V C57
2021-10-22 13:33:56 s 1 -170283.39 3 +184323.14 8800.0 C57
2021-10-22 13:43:56 S 02 59 05.971 +24 36 40.07 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)