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
2021-10-15 06:43:56 s 1 +153573.39 2 +250247.39 6960.0 C57
2021-10-15 06:53:56 S 02 56 23.388 +23 23 14.96 V C57
2021-10-15 06:53:56 s 1 +153355.06 1 +250785.40 580.0 C57
2021-10-15 07:13:56 S 02 56 23.426 +23 23 26.20 V C57
2021-10-15 07:13:56 s 1 +152915.91 3 +251857.36 9550.0 C57
2021-10-15 07:23:56 S 02 56 23.645 +23 23 30.70 V C57
2021-10-15 07:23:56 s 1 +152695.10 3 +252391.30 4910.0 C57
2021-10-15 07:43:56 S 02 56 23.724 +23 23 42.32 V C57
2021-10-15 07:43:56 s 1 +152251.03 2 +253455.14 7450.0 C57
2021-10-15 07:53:56 S 02 56 23.654 +23 23 47.40 V C57
2021-10-15 07:53:56 s 1 +152027.77 8 +253985.03 4660.0 C57
2021-10-15 08:03:56 S 02 56 23.760 +23 23 52.66 V C57
2021-10-15 08:03:56 s 1 +151803.71 7 +254513.57 9180.0 C57
2021-10-15 08:13:56 S 02 56 23.866 +23 23 58.42 V C57
2021-10-15 08:13:56 s 1 +151578.85 3 +255040.77 1020.0 C57
2021-10-15 08:23:56 S 02 56 23.942 +23 24 01.12 V C57
2021-10-15 08:23:56 s 1 +151353.18 9 +255566.62 190.0 C57
2021-10-15 08:33:56 S 02 56 24.026 +23 24 07.78 V C57
2021-10-15 08:33:56 s 1 +151126.72 9 +256091.13 6710.0 C57
2021-10-15 08:43:56 S 02 56 24.127 +23 24 12.92 V C57
2021-10-15 08:43:56 s 1 +150899.47 7 +256614.30 590.0 C57
2021-10-15 08:53:56 S 02 56 24.204 +23 24 16.42 V C57
2021-10-15 08:53:56 s 1 +150671.43 6 +257136.12 1840.0 C57
2021-10-15 09:03:56 S 02 56 24.211 +23 24 22.86 V C57
2021-10-15 09:03:56 s 1 +150442.61 0 +257656.61 480.0 C57
2021-10-15 09:13:56 S 02 56 24.329 +23 24 29.30 V C57
2021-10-15 09:13:56 s 1 +150213.00 3 +258175.76 6510.0 C57
2021-10-15 09:23:56 S 02 56 24.307 +23 24 32.94 V C57
2021-10-15 09:23:56 s 1 +149982.61 9 +258693.57 9960.0 C57
2021-10-15 09:33:56 S 02 56 24.312 +23 24 38.59 V C57
2021-10-15 09:33:56 s 1 +149751.46 0 +259210.05 820.0 C57
2021-10-15 09:43:56 S 02 56 24.511 +23 24 41.94 V C57
2021-10-15 09:43:56 s 1 +149519.53 1 +259725.19 9110.0 C57
2021-10-15 09:53:56 S 02 56 24.571 +23 24 47.70 V C57
2021-10-15 09:53:56 s 1 +149286.83 5 +260239.00 4850.0 C57
2021-10-15 10:03:56 S 02 56 24.650 +23 24 52.96 V C57
2021-10-15 10:03:56 s 1 +149053.37 6 +260751.49 8050.0 C57
2021-10-15 10:23:56 S 02 56 24.854 +23 25 02.42 V C57
2021-10-15 10:23:56 s 1 +148584.18 2 +261772.47 6870.0 C57
2021-10-15 10:33:56 S 02 56 24.888 +23 25 08.26 V C57
2021-10-15 10:33:56 s 1 +148348.45 4 +262280.97 2510.0 C57
2021-10-15 12:03:56 S 02 56 25.303 +23 25 53.04 V C57
2021-10-15 12:03:56 s 1 +146193.58 9 +266798.03 2380.0 C57
2021-10-15 12:33:56 S 02 56 25.663 +23 26 07.12 V C57
2021-10-15 12:33:56 s 1 +145462.24 0 +268280.05 8860.0 C57
2021-10-15 13:23:56 S 02 56 25.973 +23 26 32.64 V C57
2021-10-15 13:23:56 s 1 +144229.18 3 +270723.95 5970.0 C57
2021-10-15 13:33:56 S 02 56 26.052 +23 26 40.13 V C57
2021-10-15 13:33:56 s 1 +143980.48 0 +271208.83 8430.0 C57
2021-10-15 13:43:56 S 02 56 26.021 +23 26 46.14 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)