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
2021-11-02 17:53:55 s 1 -105893.24 1 +316705.76 4180.0 C57
2021-11-02 18:03:55 S 03 02 37.068 +27 40 21.07 V C57
2021-11-02 18:03:55 s 1 -106199.19 3 +316347.76 4100.0 C57
2021-11-02 18:13:55 S 03 02 37.202 +27 40 27.08 V C57
2021-11-02 18:13:55 s 1 -106504.73 0 +315988.55 2430.0 C57
2021-11-02 18:23:55 S 03 02 37.294 +27 40 32.92 V C57
2021-11-02 18:23:55 s 1 -106809.85 1 +315628.15 9170.0 C57
2021-11-02 18:33:55 S 03 02 37.450 +27 40 38.46 V C57
2021-11-02 18:33:55 s 1 -107114.55 3 +315266.55 4310.0 C57
2021-11-02 18:43:55 S 03 02 37.610 +27 40 42.78 V C57
2021-11-02 18:43:55 s 1 -107418.83 5 +314903.75 7860.0 C57
2021-11-02 18:53:55 S 03 02 37.752 +27 40 47.06 V C57
2021-11-02 18:53:55 s 1 -107722.69 5 +314539.74 9790.0 C57
2021-11-02 19:03:55 S 03 02 37.946 +27 40 53.90 V C57
2021-11-02 19:03:55 s 1 -108026.13 0 +314174.53 100.0 C57
2021-11-02 19:13:55 S 03 02 37.968 +27 40 58.51 V C57
2021-11-02 19:13:55 s 1 -108329.13 9 +313808.11 8780.0 C57
2021-11-02 19:23:55 S 03 02 38.119 +27 41 03.44 V C57
2021-11-02 19:23:55 s 1 -108631.71 9 +313440.49 5830.0 C57
2021-11-02 19:33:55 S 03 02 38.232 +27 41 08.20 V C57
2021-11-02 19:33:55 s 1 -108933.86 9 +313071.66 1250.0 C57
2021-11-02 19:43:55 S 03 02 38.448 +27 41 14.28 V C57
2021-11-02 19:43:55 s 1 -109235.58 6 +312701.62 5010.0 C57
2021-11-02 19:53:55 S 03 02 38.578 +27 41 19.86 V C57
2021-11-02 19:53:55 s 1 -109536.86 9 +312330.37 7120.0 C57
2021-11-02 20:03:55 S 03 02 38.702 +27 41 25.33 V C57
2021-11-02 20:03:55 s 1 -109837.71 5 +311957.91 7560.0 C57
2021-11-02 20:13:55 S 03 02 38.827 +27 41 29.36 V C57
2021-11-02 20:13:55 s 1 -110138.12 3 +311584.24 6340.0 C57
2021-11-02 20:23:02 C 03 05 40.84 +27 37 15.2 V C40
2021-11-02 20:23:55 S 03 02 39.010 +27 41 33.76 V C57
2021-11-02 20:23:55 s 1 -110438.09 0 +311209.35 3430.0 C57
2021-11-02 20:24:37 C 03 05 40.85 +27 37 16.4 V C40
2021-11-02 20:26:11 C 03 05 40.85 +27 37 17.6 V C40
2021-11-02 20:27:46 C 03 05 40.86 +27 37 18.8 V C40
2021-11-02 20:29:19 C 03 05 40.87 +27 37 20.1 V C40
2021-11-02 20:30:53 C 03 05 40.89 +27 37 21.4 V C40
2021-11-02 20:32:28 C 03 05 40.88 +27 37 22.6 V C40
2021-11-02 20:33:55 S 03 02 39.163 +27 41 40.16 V C57
2021-11-02 20:33:55 s 1 -110737.61 4 +310833.25 8850.0 C57
2021-11-02 20:34:03 C 03 05 40.89 +27 37 23.8 V C40
2021-11-02 20:35:37 C 03 05 40.90 +27 37 25.0 V C40
2021-11-02 20:37:12 C 03 05 40.91 +27 37 26.3 V C40
2021-11-02 20:38:45 C 03 05 40.91 +27 37 27.6 V C40
2021-11-02 20:53:55 S 03 02 39.461 +27 41 50.17 V C57
2021-11-02 20:53:55 s 1 -111335.32 6 +310077.41 4580.0 C57
2021-11-02 21:03:55 S 03 02 39.617 +27 41 55.43 V C57
2021-11-02 21:03:55 s 1 -111633.50 9 +309697.66 4890.0 C57
2021-11-02 21:13:55 S 03 02 39.758 +27 42 00.86 V C57
2021-11-02 21:13:55 s 1 -111931.24 2 +309316.69 3480.0 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)