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 13:43:56 s 1 -170387.16 0 +183626.38 8170.0 C57
2021-10-22 13:53:56 S 02 59 06.266 +24 36 44.35 V C57
2021-10-22 13:53:56 s 1 -170489.49 5 +182928.06 2440.0 C57
2021-10-22 14:03:56 S 02 59 06.684 +24 36 48.42 V C57
2021-10-22 14:03:56 s 1 -170590.39 0 +182228.19 1610.0 C57
2021-10-22 14:13:56 S 02 59 06.970 +24 36 52.20 V C57
2021-10-22 14:13:56 s 1 -170689.83 8 +181526.77 5630.0 C57
2021-10-22 14:23:56 S 02 59 07.334 +24 36 56.05 V C57
2021-10-22 14:23:56 s 1 -170787.83 0 +180823.80 4470.0 C57
2021-10-22 14:33:56 S 02 59 07.802 +24 37 00.12 V C57
2021-10-22 14:33:56 s 1 -170884.35 8 +180119.27 8120.0 C57
2021-10-22 14:43:56 S 02 59 08.136 +24 37 03.68 V C57
2021-10-22 14:43:56 s 1 -170979.41 3 +179413.18 6550.0 C57
2021-10-22 14:53:56 S 02 59 08.537 +24 37 07.79 V C57
2021-10-22 14:53:56 s 1 -171072.98 9 +178705.53 9710.0 C57
2021-10-22 15:03:56 S 02 59 08.885 +24 37 12.36 V C57
2021-10-22 15:03:56 s 1 -171165.07 6 +177996.31 7590.0 C57
2021-10-22 15:13:56 S 02 59 09.286 +24 37 17.29 V C57
2021-10-22 15:13:56 s 1 -171255.66 6 +177285.54 160.0 C57
2021-10-22 15:23:56 S 02 59 09.679 +24 37 20.35 V C57
2021-10-22 15:23:56 s 1 -171344.75 1 +176573.20 7390.0 C57
2021-10-22 15:33:56 S 02 59 10.056 +24 37 24.78 V C57
2021-10-22 15:33:56 s 1 -171432.32 3 +175859.29 9250.0 C57
2021-10-22 15:43:56 S 02 59 10.399 +24 37 28.42 V C57
2021-10-22 15:43:56 s 1 -171518.37 2 +175143.81 5700.0 C57
2021-10-22 15:53:56 S 02 59 10.704 +24 37 32.30 V C57
2021-10-22 15:53:56 s 1 -171602.89 0 +174426.76 6730.0 C57
2021-10-22 16:03:56 S 02 59 11.162 +24 37 36.84 V C57
2021-10-22 16:03:56 s 1 -171685.86 8 +173708.14 2290.0 C57
2021-10-22 16:13:56 S 02 59 11.549 +24 37 40.40 V C57
2021-10-22 16:13:56 s 1 -171767.29 9 +172987.95 2360.0 C57
2021-10-22 16:23:56 S 02 59 11.969 +24 37 44.36 V C57
2021-10-22 16:23:56 s 1 -171847.17 2 +172266.19 6920.0 C57
2021-10-22 16:33:56 S 02 59 12.324 +24 37 48.54 V C57
2021-10-22 16:33:56 s 1 -171925.47 9 +171542.84 5920.0 C57
2021-10-22 16:43:56 S 02 59 12.754 +24 37 52.79 V C57
2021-10-22 16:43:56 s 1 -172002.21 2 +170817.92 9330.0 C57
2021-10-22 16:53:56 S 02 59 13.070 +24 37 57.72 V C57
2021-10-22 16:53:56 s 1 -172077.36 1 +170091.42 7140.0 C57
2021-10-22 17:03:56 S 02 59 13.517 +24 38 02.47 V C57
2021-10-22 17:03:56 s 1 -172150.91 6 +169363.33 9300.0 C57
2021-10-22 17:23:56 S 02 59 14.246 +24 38 08.20 V C57
2021-10-22 17:23:56 s 1 -172293.21 3 +167902.42 6550.0 C57
2021-10-22 17:33:56 S 02 59 14.786 +24 38 14.03 V C57
2021-10-22 17:33:56 s 1 -172361.93 5 +167169.58 1590.0 C57
2021-10-22 17:43:56 S 02 59 15.072 +24 38 17.77 V C57
2021-10-22 17:43:56 s 1 -172429.02 7 +166435.15 850.0 C57
2021-10-22 17:53:56 S 02 59 15.391 +24 38 20.98 V C57
2021-10-22 17:53:56 s 1 -172494.47 9 +165699.14 4300.0 C57
2021-10-22 18:03:56 S 02 59 15.912 +24 38 26.02 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)