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 02:03:55 S 03 03 18.317 +27 57 10.91 V C57
2021-11-04 02:03:55 s 1 -154335.05 4 +223867.77 680.0 C57
2021-11-04 02:13:55 S 03 03 18.643 +27 57 16.70 V C57
2021-11-04 02:13:55 s 1 -154510.62 3 +223252.72 1210.0 C57
2021-11-04 02:23:55 S 03 03 18.960 +27 57 21.92 V C57
2021-11-04 02:23:55 s 1 -154685.14 3 +222636.18 7840.0 C57
2021-11-04 02:33:55 S 03 03 19.190 +27 57 27.65 V C57
2021-11-04 02:33:55 s 1 -154858.61 0 +222018.13 560.0 C57
2021-11-04 02:43:55 S 03 03 19.510 +27 57 33.41 V C57
2021-11-04 02:43:55 s 1 -155031.01 8 +221398.57 9340.0 C57
2021-11-04 02:53:55 S 03 03 19.862 +27 57 38.27 V C57
2021-11-04 02:53:55 s 1 -155202.36 1 +220777.51 4170.0 C57
2021-11-04 03:03:55 S 03 03 20.222 +27 57 43.34 V C57
2021-11-04 03:03:55 s 1 -155372.63 4 +220154.94 5020.0 C57
2021-11-04 03:13:55 S 03 03 20.525 +27 57 48.17 V C57
2021-11-04 03:13:55 s 1 -155541.83 1 +219530.85 1880.0 C57
2021-11-04 03:23:55 S 03 03 20.813 +27 57 54.43 V C57
2021-11-04 03:23:55 s 1 -155709.94 7 +218905.26 4710.0 C57
2021-11-04 03:33:55 S 03 03 21.190 +27 58 00.88 V C57
2021-11-04 03:33:55 s 1 -155876.97 5 +218278.14 3510.0 C57
2021-11-04 03:43:55 S 03 03 21.451 +27 58 05.63 V C57
2021-11-04 03:43:55 s 1 -156042.91 0 +217649.51 8260.0 C57
2021-11-04 03:53:55 S 03 03 21.785 +27 58 10.02 V C57
2021-11-04 03:53:55 s 1 -156207.74 7 +217019.36 8920.0 C57
2021-11-04 04:03:55 S 03 03 22.200 +27 58 14.99 V C57
2021-11-04 04:03:55 s 1 -156371.47 8 +216387.69 5480.0 C57
2021-11-04 04:13:55 S 03 03 22.430 +27 58 21.11 V C57
2021-11-04 04:13:55 s 1 -156534.09 9 +215754.49 7910.0 C57
2021-11-04 04:23:55 S 03 03 22.778 +27 58 27.23 V C57
2021-11-04 04:23:55 s 1 -156695.60 4 +215119.77 6210.0 C57
2021-11-04 04:33:55 S 03 03 23.112 +27 58 32.84 V C57
2021-11-04 04:33:55 s 1 -156855.98 6 +214483.51 330.0 C57
2021-11-04 04:43:55 S 03 03 23.453 +27 58 38.10 V C57
2021-11-04 04:43:55 s 1 -157015.23 9 +213845.73 270.0 C57
2021-11-04 04:53:55 S 03 03 23.806 +27 58 42.49 V C57
2021-11-04 04:53:55 s 1 -157173.35 8 +213206.41 6000.0 C57
2021-11-04 05:03:55 S 03 03 24.118 +27 58 47.21 V C57
2021-11-04 05:03:55 s 1 -157330.33 7 +212565.56 7500.0 C57
2021-11-04 05:13:55 S 03 03 24.446 +27 58 54.19 V C57
2021-11-04 05:13:55 s 1 -157486.16 8 +211923.17 4740.0 C57
2021-11-04 05:23:55 S 03 03 24.802 +27 58 59.63 V C57
2021-11-04 05:23:55 s 1 -157640.84 6 +211279.24 7700.0 C57
2021-11-04 05:33:55 S 03 03 25.092 +27 59 04.60 V C57
2021-11-04 05:33:55 s 1 -157794.36 5 +210633.77 6370.0 C57
2021-11-04 05:43:55 S 03 03 25.428 +27 59 09.38 V C57
2021-11-04 05:43:55 s 1 -157946.71 9 +209986.75 710.0 C57
2021-11-04 05:53:55 S 03 03 25.848 +27 59 14.71 V C57
2021-11-04 05:53:55 s 1 -158097.90 1 +209338.19 710.0 C57
2021-11-04 06:03:55 S 03 03 26.134 +27 59 20.83 V C57
2021-11-04 06:03:55 s 1 -158247.90 4 +208688.08 6330.0 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)