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
2021-10-14 15:13:56 s 1 +169624.59 0 +194054.79 1800.0 C57
2021-10-14 15:23:56 S 02 56 17.249 +23 15 00.47 V C57
2021-10-14 15:23:56 s 1 +169504.22 3 +194726.24 3160.0 C57
2021-10-14 15:33:56 S 02 56 17.275 +23 15 07.70 V C57
2021-10-14 15:33:56 s 1 +169382.53 6 +195396.17 100.0 C57
2021-10-14 15:43:56 S 02 56 17.381 +23 15 12.31 V C57
2021-10-14 15:43:56 s 1 +169259.53 8 +196064.59 2640.0 C57
2021-10-14 15:53:56 S 02 56 17.381 +23 15 19.80 V C57
2021-10-14 15:53:56 s 1 +169135.23 4 +196731.50 810.0 C57
2021-10-14 16:03:56 S 02 56 17.378 +23 15 25.24 V C57
2021-10-14 16:03:56 s 1 +169009.63 2 +197396.90 4620.0 C57
2021-10-14 16:13:56 S 02 56 17.537 +23 15 29.95 V C57
2021-10-14 16:13:56 s 1 +168882.73 8 +198060.80 4100.0 C57
2021-10-14 16:23:56 S 02 56 17.827 +23 15 34.02 V C57
2021-10-14 16:23:56 s 1 +168754.56 0 +198723.18 9280.0 C57
2021-10-14 16:33:56 S 02 56 17.659 +23 15 40.14 V C57
2021-10-14 16:33:56 s 1 +168625.10 4 +199384.07 180.0 C57
2021-10-14 16:43:56 S 02 56 17.748 +23 15 45.11 V C57
2021-10-14 16:43:56 s 1 +168494.37 7 +200043.45 6810.0 C57
2021-10-14 16:53:56 S 02 56 17.798 +23 15 50.80 V C57
2021-10-14 16:53:56 s 1 +168362.38 5 +200701.33 9210.0 C57
2021-10-14 17:03:56 S 02 56 17.990 +23 15 57.02 V C57
2021-10-14 17:03:56 s 1 +168229.13 5 +201357.71 7390.0 C57
2021-10-14 17:13:56 S 02 56 17.782 +23 16 03.40 V C57
2021-10-14 17:13:56 s 1 +168094.63 5 +202012.59 1380.0 C57
2021-10-14 17:23:56 S 02 56 17.964 +23 16 09.08 V C57
2021-10-14 17:23:56 s 1 +167958.88 9 +202665.98 1200.0 C57
2021-10-14 17:33:56 S 02 56 18.050 +23 16 13.91 V C57
2021-10-14 17:33:56 s 1 +167821.90 5 +203317.88 6870.0 C57
2021-10-14 17:43:56 S 02 56 18.146 +23 16 19.70 V C57
2021-10-14 17:43:56 s 1 +167683.69 0 +203968.28 8410.0 C57
2021-10-14 17:53:56 S 02 56 18.168 +23 16 26.94 V C57
2021-10-14 17:53:56 s 1 +167544.24 9 +204617.20 5850.0 C57
2021-10-14 18:03:56 S 02 56 18.180 +23 16 28.92 V C57
2021-10-14 18:03:56 s 1 +167403.58 9 +205264.62 9210.0 C57
2021-10-14 18:13:56 S 02 56 18.418 +23 16 34.50 V C57
2021-10-14 18:13:56 s 1 +167261.71 6 +205910.56 8500.0 C57
2021-10-14 18:23:56 S 02 56 18.521 +23 16 39.90 V C57
2021-10-14 18:23:56 s 1 +167118.63 7 +206555.02 3750.0 C57
2021-10-14 18:33:56 S 02 56 18.538 +23 16 47.03 V C57
2021-10-14 18:33:56 s 1 +166974.35 8 +207197.99 4980.0 C57
2021-10-14 18:43:56 S 02 56 18.610 +23 16 51.67 V C57
2021-10-14 18:43:56 s 1 +166828.88 5 +207839.49 2200.0 C57
2021-10-14 18:53:56 S 02 56 18.600 +23 16 55.52 V C57
2021-10-14 18:53:56 s 1 +166682.22 3 +208479.50 5460.0 C57
2021-10-14 19:03:56 S 02 56 18.691 +23 17 02.47 V C57
2021-10-14 19:03:56 s 1 +166534.38 1 +209118.03 4750.0 C57
2021-10-14 19:13:56 S 02 56 18.840 +23 17 08.95 V C57
2021-10-14 19:13:56 s 1 +166385.36 2 +209755.09 100.0 C57
2021-10-14 19:23:56 S 02 56 18.794 +23 17 13.34 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)