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 21:43:55 S 03 04 04.874 +28 08 08.23 V C57
2021-11-04 21:43:55 s 1 -165982.43 4 +140341.98 4630.0 C57
2021-11-04 21:47:40 n 03 06 28.62 +28 16 24.9 q Z92
2021-11-04 21:53:55 S 03 04 05.386 +28 08 13.70 V C57
2021-11-04 21:53:55 s 1 -165982.75 2 +139534.58 8240.0 C57
2021-11-04 22:03:55 S 03 04 05.892 +28 08 19.07 V C57
2021-11-04 22:03:55 s 1 -165980.97 8 +138725.42 4170.0 C57
2021-11-04 22:13:55 S 03 04 06.362 +28 08 25.12 V C57
2021-11-04 22:13:55 s 1 -165977.09 8 +137914.50 2380.0 C57
2021-11-04 22:23:55 S 03 04 06.866 +28 08 32.39 V C57
2021-11-04 22:23:55 s 1 -165971.09 7 +137101.83 2800.0 C57
2021-11-04 22:33:55 S 03 04 07.351 +28 08 38.44 V C57
2021-11-04 22:33:55 s 1 -165962.96 0 +136287.40 5380.0 C57
2021-11-04 22:43:55 S 03 04 07.889 +28 08 43.08 V C57
2021-11-04 22:43:55 s 1 -165952.67 5 +135471.20 80.0 C57
2021-11-04 22:53:55 S 03 04 08.393 +28 08 48.80 V C57
2021-11-04 22:53:55 s 1 -165940.22 5 +134653.25 6840.0 C57
2021-11-04 23:03:55 S 03 04 08.890 +28 08 54.85 V C57
2021-11-04 23:03:55 s 1 -165925.59 6 +133833.53 5610.0 C57
2021-11-04 23:13:55 S 03 04 09.389 +28 09 01.40 V C57
2021-11-04 23:13:55 s 1 -165908.77 4 +133012.04 6340.0 C57
2021-11-04 23:23:55 S 03 04 09.888 +28 09 07.99 V C57
2021-11-04 23:23:55 s 1 -165889.74 4 +132188.79 8960.0 C57
2021-11-04 23:33:55 S 03 04 10.430 +28 09 13.10 V C57
2021-11-04 23:33:55 s 1 -165868.49 0 +131363.77 3430.0 C57
2021-11-04 23:43:55 S 03 04 10.997 +28 09 18.40 V C57
2021-11-04 23:43:55 s 1 -165844.99 8 +130536.98 9700.0 C57
2021-11-04 23:53:55 S 03 04 11.438 +28 09 24.62 V C57
2021-11-04 23:53:55 s 1 -165819.25 1 +129708.42 7700.0 C57
2021-11-05 00:03:55 S 03 04 11.921 +28 09 30.85 V C57
2021-11-05 00:03:55 s 1 -165791.23 5 +128878.09 7380.0 C57
2021-11-05 00:13:55 S 03 04 12.535 +28 09 37.55 V C57
2021-11-05 00:13:55 s 1 -165760.93 3 +128045.98 8690.0 C57
2021-11-05 00:23:55 S 03 04 13.037 +28 09 43.38 V C57
2021-11-05 00:23:55 s 1 -165728.33 0 +127212.10 1570.0 C57
2021-11-05 00:33:55 S 03 04 13.601 +28 09 49.28 V C57
2021-11-05 00:33:55 s 1 -165693.41 0 +126376.45 5950.0 C57
2021-11-05 00:43:55 S 03 04 14.059 +28 09 53.89 V C57
2021-11-05 00:43:55 s 1 -165656.15 7 +125539.02 1790.0 C57
2021-11-05 00:53:55 S 03 04 14.609 +28 10 00.77 V C57
2021-11-05 00:53:55 s 1 -165616.55 5 +124699.81 9020.0 C57
2021-11-05 01:03:55 S 03 04 15.115 +28 10 07.79 V C57
2021-11-05 01:03:55 s 1 -165574.58 6 +123858.82 7580.0 C57
2021-11-05 01:13:55 S 03 04 15.653 +28 10 14.38 V C57
2021-11-05 01:13:55 s 1 -165530.23 5 +123016.06 7420.0 C57
2021-11-05 01:23:55 S 03 04 16.200 +28 10 19.02 V C57
2021-11-05 01:23:55 s 1 -165483.48 5 +122171.51 8470.0 C57
2021-11-05 01:33:55 S 03 04 16.742 +28 10 24.67 V C57
2021-11-05 01:33:55 s 1 -165434.31 8 +121325.19 670.0 C57
2021-11-05 01:43:55 S 03 04 17.251 +28 10 31.15 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)