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
2021-10-27 04:33:56 s 1 +178401.32 9 +164644.06 2300.0 C57
2021-10-27 04:43:56 S 03 03 07.894 +26 05 02.51 V C57
2021-10-27 04:43:56 s 1 +178352.65 3 +165372.49 1700.0 C57
2021-10-27 04:53:56 S 03 03 07.579 +26 05 09.28 V C57
2021-10-27 04:53:56 s 1 +178302.34 6 +166099.41 5620.0 C57
2021-10-27 05:03:56 S 03 03 07.572 +26 05 16.69 V C57
2021-10-27 05:03:56 s 1 +178250.41 9 +166824.81 4100.0 C57
2021-10-27 05:13:56 S 03 03 07.469 +26 05 25.73 V C57
2021-10-27 05:13:56 s 1 +178196.88 0 +167548.70 7180.0 C57
2021-10-27 05:23:56 S 03 03 07.370 +26 05 32.68 V C57
2021-10-27 05:23:56 s 1 +178141.73 9 +168271.08 4870.0 C57
2021-10-27 05:33:56 S 03 03 07.246 +26 05 40.09 V C57
2021-10-27 05:33:56 s 1 +178085.00 3 +168991.95 7220.0 C57
2021-10-27 05:43:56 S 03 03 07.150 +26 05 48.95 V C57
2021-10-27 05:43:56 s 1 +178026.68 2 +169711.32 4250.0 C57
2021-10-27 05:53:56 S 03 03 07.032 +26 05 55.97 V C57
2021-10-27 05:53:56 s 1 +177966.78 4 +170429.17 5980.0 C57
2021-10-27 06:03:56 S 03 03 06.953 +26 06 03.78 V C57
2021-10-27 06:03:56 s 1 +177905.31 8 +171145.53 2460.0 C57
2021-10-27 06:13:56 S 03 03 06.890 +26 06 10.76 V C57
2021-10-27 06:13:56 s 1 +177842.29 3 +171860.37 3710.0 C57
2021-10-27 06:23:56 S 03 03 06.763 +26 06 18.54 V C57
2021-10-27 06:23:56 s 1 +177777.71 7 +172573.72 9750.0 C57
2021-10-27 06:33:56 S 03 03 06.662 +26 06 26.86 V C57
2021-10-27 06:33:56 s 1 +177711.59 8 +173285.56 620.0 C57
2021-10-27 06:43:56 S 03 03 06.590 +26 06 34.09 V C57
2021-10-27 06:43:56 s 1 +177643.94 6 +173995.91 6350.0 C57
2021-10-27 06:53:56 S 03 03 06.540 +26 06 40.97 V C57
2021-10-27 06:53:56 s 1 +177574.76 7 +174704.76 6960.0 C57
2021-10-27 07:03:56 S 03 03 06.463 +26 06 50.22 V C57
2021-10-27 07:03:56 s 1 +177504.07 1 +175412.11 2480.0 C57
2021-10-27 07:13:56 S 03 03 06.329 +26 06 57.67 V C57
2021-10-27 07:13:56 s 1 +177431.86 5 +176117.96 2940.0 C57
2021-10-27 07:23:56 S 03 03 06.319 +26 07 05.95 V C57
2021-10-27 07:23:56 s 1 +177358.15 8 +176822.32 8370.0 C57
2021-10-27 07:33:56 S 03 03 06.230 +26 07 14.12 V C57
2021-10-27 07:33:56 s 1 +177282.95 8 +177525.19 8790.0 C57
2021-10-27 07:43:56 S 03 03 06.098 +26 07 20.89 V C57
2021-10-27 07:43:56 s 1 +177206.27 2 +178226.57 4230.0 C57
2021-10-27 07:53:56 S 03 03 06.024 +26 07 29.06 V C57
2021-10-27 07:53:56 s 1 +177128.10 9 +178926.45 4720.0 C57
2021-10-27 08:03:56 S 03 03 05.940 +26 07 36.98 V C57
2021-10-27 08:03:56 s 1 +177048.47 7 +179624.85 290.0 C57
2021-10-27 08:08:06 C 03 03 05.11 +25 49 19.5 V 703
2021-10-27 08:13:38 C 03 03 05.15 +25 49 23.2 V G96
2021-10-27 08:13:56 S 03 03 05.806 +26 07 43.82 V C57
2021-10-27 08:13:56 s 1 +176967.38 3 +180321.76 960.0 C57
2021-10-27 08:16:12 C 03 03 05.16 +25 49 24.5 V 703
2021-10-27 08:23:56 S 03 03 05.714 +26 07 51.53 V C57
2021-10-27 08:23:56 s 1 +176884.83 6 +181017.19 6760.0 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)