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
2021-10-28 15:33:56 S 03 02 47.467 +26 29 55.39 V C57
2021-10-28 15:33:56 s 1 +142349.67 0 +286608.76 5660.0 C57
2021-10-28 15:43:56 S 03 02 47.321 +26 30 02.59 V C57
2021-10-28 15:43:56 s 1 +142088.89 5 +287050.99 8850.0 C57
2021-10-28 15:53:56 S 03 02 47.261 +26 30 09.72 V C57
2021-10-28 15:53:56 s 1 +141827.52 3 +287491.99 80.0 C57
2021-10-28 16:03:56 S 03 02 47.182 +26 30 15.23 V C57
2021-10-28 16:03:56 s 1 +141565.55 5 +287931.77 9350.0 C57
2021-10-28 16:13:56 S 03 02 47.110 +26 30 23.18 V C57
2021-10-28 16:13:56 s 1 +141302.99 4 +288370.33 6670.0 C57
2021-10-28 16:23:56 S 03 02 46.958 +26 30 28.94 V C57
2021-10-28 16:23:56 s 1 +141039.84 3 +288807.67 2060.0 C57
2021-10-28 16:33:56 S 03 02 46.898 +26 30 35.42 V C57
2021-10-28 16:33:56 s 1 +140776.10 4 +289243.79 5520.0 C57
2021-10-28 16:43:56 S 03 02 46.757 +26 30 43.16 V C57
2021-10-28 16:43:56 s 1 +140511.78 0 +289678.69 7060.0 C57
2021-10-28 16:53:56 S 03 02 46.630 +26 30 48.85 V C57
2021-10-28 16:53:56 s 1 +140246.87 4 +290112.38 6690.0 C57
2021-10-28 17:03:56 S 03 02 46.524 +26 30 54.90 V C57
2021-10-28 17:03:56 s 1 +139981.38 7 +290544.85 4420.0 C57
2021-10-28 17:13:56 S 03 02 46.445 +26 31 02.75 V C57
2021-10-28 17:13:56 s 1 +139715.32 3 +290976.10 250.0 C57
2021-10-28 18:03:56 S 03 02 45.991 +26 31 32.92 V C57
2021-10-28 18:03:56 s 1 +138376.42 5 +293114.21 1300.0 C57
2021-10-28 18:25:43 C 03 03 43.10 +26 10 54.7 Y 557
2021-10-28 18:33:56 S 03 02 45.701 +26 31 53.47 V C57
2021-10-28 18:33:56 s 1 +137566.31 4 +294382.56 9730.0 C57
2021-10-28 19:03:56 S 03 02 45.367 +26 32 14.64 V C57
2021-10-28 19:03:56 s 1 +136751.20 4 +295640.07 1800.0 C57
2021-10-28 19:23:39 C 03 03 43.91 +26 11 35.5 Y 557
2021-10-28 19:43:56 S 03 02 45.067 +26 32 39.77 V C57
2021-10-28 19:43:56 s 1 +135656.72 6 +297299.92 6140.0 C57
2021-10-28 20:13:56 S 03 02 44.808 +26 32 59.71 V C57
2021-10-28 20:13:56 s 1 +134830.20 1 +298532.23 860.0 C57
2021-10-28 20:23:56 S 03 02 44.710 +26 33 07.20 V C57
2021-10-28 20:23:56 s 1 +134553.62 5 +298940.61 2270.0 C57
2021-10-28 20:33:56 S 03 02 44.467 +26 33 17.32 V C57
2021-10-28 20:33:56 s 1 +134276.52 1 +299347.79 1960.0 C57
2021-10-28 20:43:47 C 03 03 44.84 +26 12 31.5 Y 557
2021-10-28 20:43:56 S 03 02 44.525 +26 33 19.44 V C57
2021-10-28 20:43:56 s 1 +133998.88 8 +299753.78 9930.0 C57
2021-10-28 21:03:56 S 03 02 44.354 +26 33 33.05 V C57
2021-10-28 21:03:56 s 1 +133442.05 2 +300562.19 720.0 C57
2021-10-28 21:13:56 S 03 02 44.246 +26 33 39.24 V C57
2021-10-28 21:13:56 s 1 +133162.85 1 +300964.60 3560.0 C57
2021-10-28 21:40:13 C 03 03 45.37 +26 13 10.3 Y 557
2021-10-28 22:03:56 S 03 02 43.754 +26 34 11.64 V C57
2021-10-28 22:03:56 s 1 +131759.12 2 +302958.87 2530.0 C57
2021-10-28 22:13:56 S 03 02 43.644 +26 34 18.41 V C57
2021-10-28 22:13:56 s 1 +131476.84 6 +303354.17 5340.0 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)