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
2021-11-04 06:13:55 S 03 03 26.486 +27 59 27.17 V C57
2021-11-04 06:13:55 s 1 -158396.72 3 +208036.42 7570.0 C57
2021-11-04 06:23:55 S 03 03 26.842 +27 59 31.88 V C57
2021-11-04 06:23:55 s 1 -158544.35 1 +207383.21 4390.0 C57
2021-11-04 06:33:55 S 03 03 27.192 +27 59 37.10 V C57
2021-11-04 06:33:55 s 1 -158690.78 2 +206728.44 6770.0 C57
2021-11-04 06:43:55 S 03 03 27.540 +27 59 42.25 V C57
2021-11-04 06:43:55 s 1 -158836.00 8 +206072.11 4690.0 C57
2021-11-04 06:44:21 C 03 06 13.43 +28 04 26.3 V U97
2021-11-04 06:49:55 C 03 06 13.43 +28 04 31.0 V U97
2021-11-04 06:53:55 S 03 03 27.878 +27 59 47.80 V C57
2021-11-04 06:53:55 s 1 -158980.02 3 +205414.22 8120.0 C57
2021-11-04 07:03:55 S 03 03 28.202 +27 59 53.88 V C57
2021-11-04 07:03:55 s 1 -159122.82 1 +204754.78 7040.0 C57
2021-11-04 07:13:55 S 03 03 28.591 +27 59 59.06 V C57
2021-11-04 07:13:55 s 1 -159264.39 5 +204093.76 1420.0 C57
2021-11-04 07:23:55 S 03 03 28.944 +28 00 04.14 V C57
2021-11-04 07:23:55 s 1 -159404.73 9 +203431.18 1240.0 C57
2021-11-04 07:33:55 S 03 03 29.261 +28 00 08.75 V C57
2021-11-04 07:33:55 s 1 -159543.84 4 +202767.04 6480.0 C57
2021-11-04 07:43:55 S 03 03 29.652 +28 00 15.26 V C57
2021-11-04 07:43:55 s 1 -159681.70 5 +202101.32 7110.0 C57
2021-11-04 07:44:20 C 03 06 13.52 +28 05 15.4 V U97
2021-11-04 07:49:55 C 03 06 13.52 +28 05 20.0 V U97
2021-11-04 07:53:55 S 03 03 29.986 +28 00 21.24 V C57
2021-11-04 07:53:55 s 1 -159818.31 5 +201434.03 3100.0 C57
2021-11-04 08:03:55 S 03 03 30.312 +28 00 26.46 V C57
2021-11-04 08:03:55 s 1 -159953.66 7 +200765.16 4440.0 C57
2021-11-04 08:13:55 S 03 03 30.706 +28 00 31.82 V C57
2021-11-04 08:13:55 s 1 -160087.75 3 +200094.71 1080.0 C57
2021-11-04 08:23:55 S 03 03 31.058 +28 00 36.94 V C57
2021-11-04 08:23:55 s 1 -160220.56 7 +199422.69 3020.0 C57
2021-11-04 08:33:55 S 03 03 31.390 +28 00 41.76 V C57
2021-11-04 08:33:55 s 1 -160352.10 1 +198749.08 220.0 C57
2021-11-04 08:43:55 S 03 03 31.834 +28 00 48.56 V C57
2021-11-04 08:43:55 s 1 -160482.34 9 +198073.89 2660.0 C57
2021-11-04 08:53:55 S 03 03 32.114 +28 00 54.47 V C57
2021-11-04 08:53:55 s 1 -160611.30 3 +197397.11 310.0 C57
2021-11-04 09:03:55 S 03 03 32.491 +28 00 59.22 V C57
2021-11-04 09:03:55 s 1 -160738.95 6 +196718.75 3140.0 C57
2021-11-04 09:13:55 S 03 03 32.866 +28 01 04.40 V C57
2021-11-04 09:13:55 s 1 -160865.30 0 +196038.79 1130.0 C57
2021-11-04 09:23:55 S 03 03 33.233 +28 01 09.48 V C57
2021-11-04 09:23:55 s 1 -160990.32 9 +195357.24 4250.0 C57
2021-11-04 09:33:55 S 03 03 33.629 +28 01 16.10 V C57
2021-11-04 09:33:55 s 1 -161114.03 5 +194674.09 2480.0 C57
2021-11-04 09:43:55 S 03 03 33.938 +28 01 22.04 V C57
2021-11-04 09:43:55 s 1 -161236.41 0 +193989.34 5780.0 C57
2021-11-04 10:23:55 S 03 03 35.494 +28 01 42.10 V C57
2021-11-04 10:23:55 s 1 -161712.45 1 +191234.33 9210.0 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)