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
2021-11-03 13:43:55 S 03 02 58.416 +27 50 38.72 V C57
2021-11-03 13:43:55 s 1 -138777.29 2 +265357.39 2260.0 C57
2021-11-03 13:53:55 S 03 02 58.618 +27 50 44.99 V C57
2021-11-03 13:53:55 s 1 -139017.37 6 +264847.93 3470.0 C57
2021-11-03 14:03:55 S 03 02 58.841 +27 50 50.60 V C57
2021-11-03 14:03:55 s 1 -139256.73 6 +264337.12 1960.0 C57
2021-11-03 14:13:55 S 03 02 59.050 +27 50 55.82 V C57
2021-11-03 14:13:55 s 1 -139495.36 7 +263824.94 7720.0 C57
2021-11-03 14:23:55 S 03 02 59.299 +27 51 00.00 V C57
2021-11-03 14:23:55 s 1 -139733.26 7 +263311.40 740.0 C57
2021-11-03 14:33:55 S 03 02 59.568 +27 51 05.00 V C57
2021-11-03 14:33:55 s 1 -139970.43 2 +262796.50 1010.0 C57
2021-11-03 14:43:55 S 03 02 59.782 +27 51 10.80 V C57
2021-11-03 14:43:55 s 1 -140206.85 8 +262280.22 8510.0 C57
2021-11-03 14:48:44 C 03 05 57.54 +27 51 43.2 q Q21
2021-11-03 14:53:55 S 03 03 00.031 +27 51 16.81 V C57
2021-11-03 14:53:55 s 1 -140442.54 2 +261762.58 3230.0 C57
2021-11-03 14:56:17 C 03 05 57.56 +27 51 49.3 q Q21
2021-11-03 15:03:55 S 03 03 00.247 +27 51 21.74 V C57
2021-11-03 15:03:55 s 1 -140677.48 0 +261243.57 5160.0 C57
2021-11-03 15:13:55 S 03 03 00.509 +27 51 26.50 V C57
2021-11-03 15:13:55 s 1 -140911.66 9 +260723.19 4290.0 C57
2021-11-03 15:23:55 S 03 03 00.727 +27 51 31.39 V C57
2021-11-03 15:23:55 s 1 -141145.10 5 +260201.43 590.0 C57
2021-11-03 15:33:55 S 03 03 00.960 +27 51 37.66 V C57
2021-11-03 15:33:55 s 1 -141377.78 4 +259678.30 4070.0 C57
2021-11-03 15:43:55 S 03 03 01.193 +27 51 43.13 V C57
2021-11-03 15:43:55 s 1 -141609.70 2 +259153.79 4700.0 C57
2021-11-03 15:53:55 S 03 03 01.462 +27 51 47.56 V C57
2021-11-03 15:53:55 s 1 -141840.85 7 +258627.90 2460.0 C57
2021-11-03 16:03:55 S 03 03 01.723 +27 51 53.03 V C57
2021-11-03 16:03:55 s 1 -142071.24 4 +258100.63 7360.0 C57
2021-11-03 16:13:55 S 03 03 01.973 +27 51 57.78 V C57
2021-11-03 16:13:55 s 1 -142300.85 9 +257571.97 9370.0 C57
2021-11-03 16:23:55 S 03 03 02.165 +27 52 03.40 V C57
2021-11-03 16:23:55 s 1 -142529.69 9 +257041.94 8480.0 C57
2021-11-03 16:33:55 S 03 03 02.417 +27 52 09.70 V C57
2021-11-03 16:33:55 s 1 -142757.76 0 +256510.51 4680.0 C57
2021-11-03 16:43:55 S 03 03 02.722 +27 52 14.84 V C57
2021-11-03 16:43:55 s 1 -142985.03 9 +255977.70 7950.0 C57
2021-11-03 16:53:55 S 03 03 02.952 +27 52 19.13 V C57
2021-11-03 16:53:55 s 1 -143211.53 0 +255443.50 8270.0 C57
2021-11-03 17:03:55 S 03 03 03.185 +27 52 24.13 V C57
2021-11-03 17:03:55 s 1 -143437.23 2 +254907.91 5650.0 C57
2021-11-03 17:13:55 S 03 03 03.403 +27 52 30.22 V C57
2021-11-03 17:13:55 s 1 -143662.13 9 +254370.92 50.0 C57
2021-11-03 17:23:55 S 03 03 03.691 +27 52 35.98 V C57
2021-11-03 17:23:55 s 1 -143886.24 8 +253832.54 1470.0 C57
2021-11-03 17:33:55 S 03 03 03.972 +27 52 40.73 V C57
2021-11-03 17:33:55 s 1 -144109.55 4 +253292.76 9890.0 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)