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
2021-10-26 14:43:56 s 1 +175696.58 5 +98816.526 340.0 C57
2021-10-26 14:53:56 S 03 03 14.014 +25 53 44.63 V C57
2021-10-26 14:53:56 s 1 +175823.04 7 +99673.088 20.0 C57
2021-10-26 15:03:56 S 03 03 13.922 +25 53 52.19 V C57
2021-10-26 15:03:56 s 1 +175946.80 8 +100528.11 570.0 C57
2021-10-26 15:13:56 S 03 03 13.915 +25 54 00.47 V C57
2021-10-26 15:13:56 s 1 +176067.88 8 +101381.61 2040.0 C57
2021-10-26 15:23:56 S 03 03 13.910 +25 54 10.44 V C57
2021-10-26 15:23:56 s 1 +176186.30 3 +102233.57 4510.0 C57
2021-10-26 15:33:56 S 03 03 13.807 +25 54 18.68 V C57
2021-10-26 15:33:56 s 1 +176302.07 0 +103083.99 8030.0 C57
2021-10-26 15:43:56 S 03 03 13.738 +25 54 28.30 V C57
2021-10-26 15:43:56 s 1 +176415.20 9 +103932.88 2650.0 C57
2021-10-26 15:53:56 S 03 03 13.682 +25 54 35.78 V C57
2021-10-26 15:53:56 s 1 +176525.73 5 +104780.22 8450.0 C57
2021-10-26 16:03:56 S 03 03 13.618 +25 54 45.11 V C57
2021-10-26 16:03:56 s 1 +176633.66 7 +105626.03 5470.0 C57
2021-10-26 16:13:56 S 03 03 13.512 +25 54 52.85 V C57
2021-10-26 16:13:56 s 1 +176739.02 0 +106470.29 3780.0 C57
2021-10-26 16:23:56 S 03 03 13.433 +25 55 01.34 V C57
2021-10-26 16:23:56 s 1 +176841.81 3 +107313.01 3430.0 C57
2021-10-26 16:33:56 S 03 03 13.366 +25 55 10.09 V C57
2021-10-26 16:33:56 s 1 +176942.06 1 +108154.18 4490.0 C57
2021-10-26 16:43:56 S 03 03 13.296 +25 55 17.33 V C57
2021-10-26 16:43:56 s 1 +177039.78 2 +108993.80 7010.0 C57
2021-10-26 16:53:56 S 03 03 13.277 +25 55 26.62 V C57
2021-10-26 16:53:56 s 1 +177134.99 1 +109831.88 1040.0 C57
2021-10-26 17:03:56 S 03 03 13.205 +25 55 35.26 V C57
2021-10-26 17:03:56 s 1 +177227.70 6 +110668.41 6640.0 C57
2021-10-26 17:13:56 S 03 03 13.159 +25 55 43.25 V C57
2021-10-26 17:13:56 s 1 +177317.94 1 +111503.39 3860.0 C57
2021-10-26 17:23:56 S 03 03 13.140 +25 55 52.61 V C57
2021-10-26 17:23:56 s 1 +177405.71 3 +112336.82 2770.0 C57
2021-10-26 17:33:56 S 03 03 13.037 +25 56 00.49 V C57
2021-10-26 17:33:56 s 1 +177491.03 9 +113168.70 3420.0 C57
2021-10-26 17:43:56 S 03 03 13.027 +25 56 08.95 V C57
2021-10-26 17:43:56 s 1 +177573.93 3 +113999.02 5850.0 C57
2021-10-26 17:53:56 S 03 03 12.905 +25 56 17.38 V C57
2021-10-26 17:53:56 s 1 +177654.41 1 +114827.80 130.0 C57
2021-10-26 18:03:56 S 03 03 12.845 +25 56 24.94 V C57
2021-10-26 18:03:56 s 1 +177732.48 9 +115655.02 6300.0 C57
2021-10-26 18:13:56 S 03 03 12.727 +25 56 34.40 V C57
2021-10-26 18:13:56 s 1 +177808.18 3 +116480.69 4420.0 C57
2021-10-26 18:23:56 S 03 03 12.662 +25 56 42.29 V C57
2021-10-26 18:23:56 s 1 +177881.50 6 +117304.80 4540.0 C57
2021-10-26 18:33:56 S 03 03 12.593 +25 56 50.64 V C57
2021-10-26 18:33:56 s 1 +177952.47 4 +118127.36 6710.0 C57
2021-10-26 18:43:56 S 03 03 12.533 +25 56 59.39 V C57
2021-10-26 18:43:56 s 1 +178021.10 3 +118948.37 990.0 C57
2021-10-26 18:53:56 S 03 03 12.449 +25 57 06.37 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)