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
2011-04-07 20:27:40 C 07 10 41.11 +20 21 49.8 c A24
2011-04-07 20:36:53 C 07 10 43.40 +20 21 46.4 c A24
2011-04-07 20:50:26 C 07 10 46.72 +20 21 39.2 c A24
2011-05-03 04:45:46 C 09 21 34.20 +12 47 14.1 r 703
2011-05-03 04:59:13 C 09 21 36.64 +12 47 02.8 r 703
2011-05-03 05:12:08 C 09 21 38.95 +12 46 52.0 r 703
2011-05-03 05:24:56 C 09 21 41.22 +12 46 40.1 r 703
2012-10-15 10:13:06 C 08 00 51.19 +23 23 09.6 19.3 c 704
2012-10-15 10:32:32 C 08 00 55.72 +23 22 56.4 19.4 c 704
2012-10-15 11:11:46 C 08 01 05.00 +23 22 29.2 19.5 c 704
2012-10-15 11:31:12 C 08 01 09.67 +23 22 16.6 19.2 c 704
2012-12-02 11:50:14 C 12 05 55.86 +00 33 55.3 r G96
2012-12-02 12:02:47 C 12 05 57.98 +00 33 39.5 r G96
2012-12-02 12:15:16 C 12 06 00.10 +00 33 24.1 r G96
2012-12-02 12:27:52 C 12 06 02.23 +00 33 08.0 r G96
2013-01-02 12:46:22 C 13 59 48.94 -12 33 08.4 r G96
2013-01-02 12:55:46 C 13 59 50.20 -12 33 16.5 r G96
2013-01-02 13:05:12 C 13 59 51.46 -12 33 24.5 r G96
2013-01-02 13:14:36 C 13 59 52.72 -12 33 32.3 r G96
2013-01-14 12:42:59 C 14 37 40.58 -16 11 45.9 r 703
2013-01-14 12:53:02 C 14 37 41.91 -16 11 52.2 r 703
2013-01-14 13:03:05 C 14 37 43.03 -16 12 00.3 r 703
2013-04-14 13:53:22 C 16 51 35.960 -25 54 59.38 L F51
2013-04-14 14:10:20 C 16 51 35.262 -25 54 59.31 L F51
2013-06-01 09:11:12 C 15 28 59.968 -22 16 01.34 L F51
2013-06-01 09:32:31 C 15 28 58.582 -22 15 55.12 L F51
2013-06-01 09:53:51 C 15 28 57.202 -22 15 48.87 L F51
2013-06-05 05:00:16 C 15 23 45.10 -21 49 53.7 u G32
2013-06-05 05:06:17 C 15 23 44.77 -21 49 52.5 u G32
2013-06-05 05:18:18 C 15 23 44.13 -21 49 49.0 u G32
2013-06-05 05:24:19 C 15 23 43.76 -21 49 47.7 u G32
2015-05-22 12:59:04 C 19 12 21.558 -24 25 17.87 L F51
2015-05-22 13:14:06 C 19 12 21.032 -24 25 18.87 L F51
2015-05-24 12:44:19 C 19 10 43.982 -24 28 36.70 L F51
2015-05-24 12:59:02 C 19 10 43.424 -24 28 37.84 L F51
2015-05-24 13:13:47 C 19 10 42.849 -24 28 38.75 L F51
2017-06-24 12:17:10 C 20 53 29.159 -18 29 17.28 L F51
2017-06-24 12:33:02 C 20 53 28.544 -18 29 19.50 L F51
2017-06-24 12:48:54 C 20 53 27.938 -18 29 21.48 L F51
2017-07-26 09:48:53 C 20 07 54.037 -20 51 22.95 L F51
2017-07-26 10:06:11 C 20 07 52.732 -20 51 26.19 L F51
2017-07-26 10:23:33 C 20 07 51.431 -20 51 29.29 L F51
2017-07-26 10:40:54 C 20 07 50.124 -20 51 32.57 L F51
2019-07-26 11:45:42 C 22 43 55.288 -07 42 26.69 U F52
2019-07-26 12:01:32 C 22 43 54.803 -07 42 28.69 U F52
2019-07-26 12:17:10 C 22 43 54.305 -07 42 30.73 U F52
2019-07-28 05:09:47 C 22 42 39.57 -07 47 57.4 q W76
2019-07-28 05:33:40 C 22 42 38.78 -07 48 00.5 q W76
2019-07-28 05:58:31 C 22 42 37.90 -07 48 04.7 q W76
2019-07-28 06:23:32 C 22 42 37.03 -07 48 08.1 q W76
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)