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
2021-10-21 17:13:56 s 1 -148882.60 1 +258235.24 1160.0 C57
2021-10-21 17:23:56 S 02 58 27.070 +24 28 41.20 V C57
2021-10-21 17:23:56 s 1 -149115.47 4 +257714.71 3150.0 C57
2021-10-21 17:33:56 S 02 58 27.353 +24 28 45.37 V C57
2021-10-21 17:33:56 s 1 -149347.57 2 +257192.83 2340.0 C57
2021-10-21 17:43:56 S 02 58 27.682 +24 28 50.02 V C57
2021-10-21 17:43:56 s 1 -149578.89 2 +256669.61 8710.0 C57
2021-10-21 17:53:56 S 02 58 27.833 +24 28 54.34 V C57
2021-10-21 17:53:56 s 1 -149809.43 0 +256145.03 2240.0 C57
2021-10-21 18:03:56 S 02 58 28.181 +24 28 57.00 V C57
2021-10-21 18:03:56 s 1 -150039.18 2 +255619.11 2940.0 C57
2021-10-21 18:13:56 S 02 58 28.378 +24 29 01.50 V C57
2021-10-21 18:13:56 s 1 -150268.14 5 +255091.83 770.0 C57
2021-10-21 18:23:56 S 02 58 28.658 +24 29 07.04 V C57
2021-10-21 18:23:56 s 1 -150496.31 5 +254563.20 5740.0 C57
2021-10-21 18:33:56 S 02 58 29.081 +24 29 08.16 V C57
2021-10-21 18:33:56 s 1 -150723.68 8 +254033.22 7820.0 C57
2021-10-21 18:43:56 S 02 58 29.285 +24 29 12.48 V C57
2021-10-21 18:43:56 s 1 -150950.26 0 +253501.87 7010.0 C57
2021-10-21 18:53:56 S 02 58 29.635 +24 29 16.37 V C57
2021-10-21 18:53:56 s 1 -151176.02 8 +252969.17 3290.0 C57
2021-10-21 19:03:56 S 02 58 29.806 +24 29 21.80 V C57
2021-10-21 19:03:56 s 1 -151400.98 8 +252435.11 6640.0 C57
2021-10-21 19:13:56 S 02 58 30.091 +24 29 24.72 V C57
2021-10-21 19:13:56 s 1 -151625.13 5 +251899.69 7060.0 C57
2021-10-21 19:23:56 S 02 58 30.370 +24 29 28.32 V C57
2021-10-21 19:23:56 s 1 -151848.46 7 +251362.91 4530.0 C57
2021-10-21 19:33:56 S 02 58 30.655 +24 29 30.37 V C57
2021-10-21 19:33:56 s 1 -152070.97 9 +250824.76 9040.0 C57
2021-10-21 19:43:56 S 02 58 30.979 +24 29 34.94 V C57
2021-10-21 19:43:56 s 1 -152292.66 7 +250285.24 570.0 C57
2021-10-21 19:53:56 S 02 58 31.339 +24 29 38.15 V C57
2021-10-21 19:53:56 s 1 -152513.52 8 +249744.36 9110.0 C57
2021-10-21 20:03:56 S 02 58 31.555 +24 29 42.54 V C57
2021-10-21 20:03:56 s 1 -152733.55 7 +249202.11 4650.0 C57
2021-10-21 20:13:56 S 02 58 31.788 +24 29 47.15 V C57
2021-10-21 20:13:56 s 1 -152952.75 1 +248658.49 7160.0 C57
2021-10-21 20:23:56 S 02 58 32.081 +24 29 51.86 V C57
2021-10-21 20:23:56 s 1 -153171.10 5 +248113.50 6650.0 C57
2021-10-21 20:33:56 S 02 58 32.407 +24 29 55.03 V C57
2021-10-21 20:33:56 s 1 -153388.61 6 +247567.13 3090.0 C57
2021-10-21 20:43:56 S 02 58 32.683 +24 30 00.47 V C57
2021-10-21 20:43:56 s 1 -153605.27 9 +247019.39 6480.0 C57
2021-10-21 20:53:56 S 02 58 32.983 +24 30 03.53 V C57
2021-10-21 20:53:56 s 1 -153821.09 1 +246470.27 6780.0 C57
2021-10-21 21:03:56 S 02 58 33.242 +24 30 06.66 V C57
2021-10-21 21:03:56 s 1 -154036.04 7 +245919.77 4000.0 C57
2021-10-21 21:13:56 S 02 58 33.518 +24 30 09.90 V C57
2021-10-21 21:13:56 s 1 -154250.14 4 +245367.90 8120.0 C57
2021-10-21 21:23:56 S 02 58 33.761 +24 30 12.56 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)