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
2021-10-22 18:03:56 s 1 -172558.28 3 +164961.54 1920.0 C57
2021-10-22 18:13:56 S 02 59 16.195 +24 38 28.36 V C57
2021-10-22 18:13:56 s 1 -172620.42 9 +164222.34 3660.0 C57
2021-10-22 18:23:56 S 02 59 16.392 +24 38 35.84 V C57
2021-10-22 18:23:56 s 1 -172680.90 6 +163481.55 9500.0 C57
2021-10-22 18:33:56 S 02 59 17.002 +24 38 39.34 V C57
2021-10-22 18:33:56 s 1 -172739.70 6 +162739.16 9410.0 C57
2021-10-22 18:43:56 S 02 59 17.390 +24 38 42.65 V C57
2021-10-22 18:43:56 s 1 -172796.81 9 +161995.18 3340.0 C57
2021-10-22 18:53:56 S 02 59 17.762 +24 38 48.16 V C57
2021-10-22 18:53:56 s 1 -172852.23 3 +161249.60 1260.0 C57
2021-10-22 19:03:56 S 02 59 18.137 +24 38 50.32 V C57
2021-10-22 19:03:56 s 1 -172905.94 1 +160502.42 3140.0 C57
2021-10-22 19:23:56 S 02 59 19.046 +24 38 58.56 V C57
2021-10-22 19:23:56 s 1 -173008.19 3 +159003.25 8650.0 C57
2021-10-22 19:33:56 S 02 59 19.380 +24 39 01.98 V C57
2021-10-22 19:33:56 s 1 -173056.71 8 +158251.26 2210.0 C57
2021-10-22 19:43:56 S 02 59 19.666 +24 39 07.24 V C57
2021-10-22 19:43:56 s 1 -173103.49 5 +157497.67 9580.0 C57
2021-10-22 19:53:56 S 02 59 20.112 +24 39 11.45 V C57
2021-10-22 19:53:56 s 1 -173148.51 3 +156742.47 740.0 C57
2021-10-22 20:03:56 S 02 59 20.640 +24 39 15.98 V C57
2021-10-22 20:03:56 s 1 -173191.76 3 +155985.66 5640.0 C57
2021-10-22 20:13:56 S 02 59 20.954 +24 39 20.16 V C57
2021-10-22 20:13:56 s 1 -173233.23 3 +155227.24 4250.0 C57
2021-10-22 20:23:56 S 02 59 21.355 +24 39 24.88 V C57
2021-10-22 20:23:56 s 1 -173272.91 3 +154467.22 6540.0 C57
2021-10-22 20:33:56 S 02 59 21.792 +24 39 27.54 V C57
2021-10-22 20:33:56 s 1 -173310.79 3 +153705.57 2470.0 C57
2021-10-22 20:43:56 S 02 59 22.231 +24 39 30.96 V C57
2021-10-22 20:43:56 s 1 -173346.86 1 +152942.32 2000.0 C57
2021-10-22 20:53:56 S 02 59 22.608 +24 39 35.14 V C57
2021-10-22 20:53:56 s 1 -173381.10 7 +152177.45 5090.0 C57
2021-10-22 21:03:56 S 02 59 23.047 +24 39 40.25 V C57
2021-10-22 21:03:56 s 1 -173413.51 9 +151410.97 1710.0 C57
2021-10-22 21:13:56 S 02 59 23.393 +24 39 43.81 V C57
2021-10-22 21:13:56 s 1 -173444.08 8 +150642.87 1810.0 C57
2021-10-22 21:23:56 S 02 59 23.844 +24 39 48.78 V C57
2021-10-22 21:23:56 s 1 -173472.80 0 +149873.15 5360.0 C57
2021-10-22 21:33:56 S 02 59 24.199 +24 39 52.81 V C57
2021-10-22 21:33:56 s 1 -173499.64 6 +149101.81 2320.0 C57
2021-10-22 21:43:56 S 02 59 24.708 +24 39 56.77 V C57
2021-10-22 21:43:56 s 1 -173524.61 4 +148328.85 2660.0 C57
2021-10-22 21:53:56 S 02 59 25.054 +24 40 01.24 V C57
2021-10-22 21:53:56 s 1 -173547.69 3 +147554.26 6320.0 C57
2021-10-22 22:03:56 S 02 59 25.579 +24 40 05.27 V C57
2021-10-22 22:03:56 s 1 -173568.87 1 +146778.06 3280.0 C57
2021-10-22 22:13:56 S 02 59 25.910 +24 40 08.98 V C57
2021-10-22 22:13:56 s 1 -173588.13 6 +146000.23 3480.0 C57
2021-10-22 22:23:56 S 02 59 26.352 +24 40 13.69 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)