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 02:33:56 s 1 +160610.57 4 +248249.99 9700.0 C57
2021-10-28 02:43:56 S 03 02 54.917 +26 21 12.10 V C57
2021-10-28 02:43:56 s 1 +160405.55 0 +248791.26 6970.0 C57
2021-10-28 02:53:56 S 03 02 54.866 +26 21 19.66 V C57
2021-10-28 02:53:56 s 1 +160199.68 1 +249331.22 1440.0 C57
2021-10-28 03:03:56 S 03 02 54.770 +26 21 25.99 V C57
2021-10-28 03:03:56 s 1 +159992.97 2 +249869.86 3120.0 C57
2021-10-28 03:13:56 S 03 02 54.691 +26 21 32.04 V C57
2021-10-28 03:13:56 s 1 +159785.42 5 +250407.18 2020.0 C57
2021-10-28 03:14:36 C 03 03 23.64 +26 01 09.5 Y 557
2021-10-28 03:23:56 S 03 02 54.538 +26 21 39.85 V C57
2021-10-28 03:23:56 s 1 +159577.04 6 +250943.19 8170.0 C57
2021-10-28 03:33:56 S 03 02 54.451 +26 21 46.98 V C57
2021-10-28 03:33:56 s 1 +159367.83 7 +251477.88 1560.0 C57
2021-10-28 03:43:56 S 03 02 54.365 +26 21 54.14 V C57
2021-10-28 03:43:56 s 1 +159157.80 2 +252011.26 2220.0 C57
2021-10-28 03:53:56 S 03 02 54.269 +26 22 01.63 V C57
2021-10-28 03:53:56 s 1 +158946.94 5 +252543.33 160.0 C57
2021-10-28 04:03:56 S 03 02 54.206 +26 22 06.24 V C57
2021-10-28 04:03:56 s 1 +158735.27 0 +253074.08 5380.0 C57
2021-10-28 04:12:38 C 03 03 24.39 +26 01 44.0 Y 557
2021-10-28 04:13:56 S 03 02 54.074 +26 22 14.12 V C57
2021-10-28 04:13:56 s 1 +158522.78 1 +253603.53 7900.0 C57
2021-10-28 04:23:56 S 03 02 54.079 +26 22 21.72 V C57
2021-10-28 04:23:56 s 1 +158309.48 1 +254131.68 7740.0 C57
2021-10-28 04:33:56 S 03 02 53.978 +26 22 29.10 V C57
2021-10-28 04:33:56 s 1 +158095.37 3 +254658.51 4910.0 C57
2021-10-28 04:43:56 S 03 02 53.849 +26 22 35.51 V C57
2021-10-28 04:43:56 s 1 +157880.46 2 +255184.05 9410.0 C57
2021-10-28 04:53:56 S 03 02 53.700 +26 22 42.31 V C57
2021-10-28 04:53:56 s 1 +157664.75 1 +255708.27 1260.0 C57
2021-10-28 05:03:56 S 03 02 53.657 +26 22 49.33 V C57
2021-10-28 05:03:56 s 1 +157448.24 3 +256231.20 480.0 C57
2021-10-28 05:13:56 S 03 02 53.561 +26 22 56.10 V C57
2021-10-28 05:13:56 s 1 +157230.94 3 +256752.83 7070.0 C57
2021-10-28 05:23:56 S 03 02 53.467 +26 23 03.62 V C57
2021-10-28 05:23:56 s 1 +157012.85 3 +257273.16 1050.0 C57
2021-10-28 05:33:56 S 03 02 53.350 +26 23 10.43 V C57
2021-10-28 05:33:56 s 1 +156793.97 8 +257792.19 2430.0 C57
2021-10-28 05:43:56 S 03 02 53.246 +26 23 16.01 V C57
2021-10-28 05:43:56 s 1 +156574.32 1 +258309.92 1220.0 C57
2021-10-28 05:53:56 S 03 02 53.131 +26 23 23.39 V C57
2021-10-28 05:53:56 s 1 +156353.88 5 +258826.36 7430.0 C57
2021-10-28 06:03:56 S 03 02 53.023 +26 23 31.06 V C57
2021-10-28 06:03:56 s 1 +156132.67 3 +259341.50 1080.0 C57
2021-10-28 06:13:56 S 03 02 52.968 +26 23 37.39 V C57
2021-10-28 06:13:56 s 1 +155910.69 0 +259855.35 2170.0 C57
2021-10-28 06:23:56 S 03 02 52.829 +26 23 44.38 V C57
2021-10-28 06:23:56 s 1 +155687.93 9 +260367.91 720.0 C57
2021-10-28 06:33:56 S 03 02 52.714 +26 23 51.00 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)