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
2021-11-01 20:33:55 s 1 -63935.006 0 +352964.25 8550.0 C57
2021-11-01 20:43:55 S 03 02 24.674 +27 29 07.40 V C57
2021-11-01 20:43:55 s 1 -64280.065 0 +352752.38 270.0 C57
2021-11-01 20:53:55 S 03 02 24.684 +27 29 12.34 V C57
2021-11-01 20:53:55 s 1 -64624.912 0 +352539.41 1140.0 C57
2021-11-01 21:03:55 S 03 02 24.792 +27 29 17.38 V C57
2021-11-01 21:03:55 s 1 -64969.545 0 +352325.34 1160.0 C57
2021-11-01 21:13:56 S 03 02 24.828 +27 29 23.06 V C57
2021-11-01 21:13:56 s 1 -65313.963 0 +352110.18 320.0 C57
2021-11-01 21:23:55 S 03 02 24.888 +27 29 27.74 V C57
2021-11-01 21:23:55 s 1 -65658.166 0 +351893.92 8620.0 C57
2021-11-01 21:33:56 S 03 02 24.967 +27 29 33.54 V C57
2021-11-01 21:33:56 s 1 -66002.151 0 +351676.57 6060.0 C57
2021-11-01 21:43:55 S 03 02 25.106 +27 29 38.62 V C57
2021-11-01 21:43:55 s 1 -66345.917 0 +351458.11 2620.0 C57
2021-11-01 21:53:56 S 03 02 25.190 +27 29 43.55 V C57
2021-11-01 21:53:56 s 1 -66689.463 0 +351238.56 8310.0 C57
2021-11-01 22:03:55 S 03 02 25.147 +27 29 50.10 V C57
2021-11-01 22:03:55 s 1 -67032.788 0 +351017.90 3110.0 C57
2021-11-01 22:13:55 S 03 02 25.303 +27 29 54.53 V C57
2021-11-01 22:13:55 s 1 -67375.890 0 +350796.15 7030.0 C57
2021-11-01 22:23:55 S 03 02 25.286 +27 29 59.71 V C57
2021-11-01 22:23:55 s 1 -67718.768 0 +350573.30 60.0 C57
2021-11-01 22:33:55 S 03 02 25.366 +27 30 04.75 V C57
2021-11-01 22:33:55 s 1 -68061.421 0 +350349.34 2200.0 C57
2021-11-01 22:43:56 S 03 02 25.452 +27 30 10.76 V C57
2021-11-01 22:43:56 s 1 -68403.847 0 +350124.28 3440.0 C57
2021-11-01 22:53:55 S 03 02 25.567 +27 30 16.27 V C57
2021-11-01 22:53:55 s 1 -68746.045 0 +349898.12 3770.0 C57
2021-11-01 23:03:56 S 03 02 25.610 +27 30 20.88 V C57
2021-11-01 23:03:56 s 1 -69088.014 0 +349670.86 3190.0 C57
2021-11-01 23:13:55 S 03 02 25.728 +27 30 26.03 V C57
2021-11-01 23:13:55 s 1 -69429.752 0 +349442.49 1700.0 C57
2021-11-01 23:23:56 S 03 02 25.730 +27 30 32.65 V C57
2021-11-01 23:23:56 s 1 -69771.258 0 +349213.02 9280.0 C57
2021-11-01 23:33:55 S 03 02 25.829 +27 30 37.22 V C57
2021-11-01 23:33:55 s 1 -70112.531 0 +348982.44 5950.0 C57
2021-11-01 23:53:55 S 03 02 25.891 +27 30 47.12 V C57
2021-11-01 23:53:55 s 1 -70794.371 0 +348517.97 6490.0 C57
2021-11-02 00:03:55 S 03 02 25.987 +27 30 53.64 V C57
2021-11-02 00:03:55 s 1 -71134.935 0 +348284.08 350.0 C57
2021-11-02 00:13:56 S 03 02 26.066 +27 30 58.32 V C57
2021-11-02 00:13:56 s 1 -71475.261 0 +348049.07 3270.0 C57
2021-11-02 00:23:55 S 03 02 26.124 +27 31 03.11 V C57
2021-11-02 00:23:55 s 1 -71815.347 0 +347812.96 5240.0 C57
2021-11-02 00:33:56 S 03 02 26.220 +27 31 08.47 V C57
2021-11-02 00:33:56 s 1 -72155.191 0 +347575.74 6250.0 C57
2021-11-02 00:43:55 S 03 02 26.316 +27 31 14.95 V C57
2021-11-02 00:43:55 s 1 -72494.792 0 +347337.41 6310.0 C57
2021-11-02 00:53:55 S 03 02 26.376 +27 31 20.46 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)