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
2021-11-05 05:53:55 s 1 -163248.30 9 +98694.373 8530.0 C57
2021-11-05 05:57:31 C 03 06 36.56 +28 23 33.9 V 703
2021-11-05 06:03:55 S 03 04 32.167 +28 13 12.47 V C57
2021-11-05 06:03:55 s 1 -163126.85 6 +97799.883 6540.0 C57
2021-11-05 06:05:03 C 03 06 36.49 +28 23 41.0 V 703
2021-11-05 06:12:34 C 03 06 36.50 +28 23 47.7 V 703
2021-11-05 06:13:55 S 03 04 32.710 +28 13 18.34 V C57
2021-11-05 06:13:55 s 1 -163002.43 9 +96903.618 3730.0 C57
2021-11-05 06:17:20 C 03 06 35.89 +28 23 57.7 t V40
2021-11-05 06:20:05 C 03 06 36.51 +28 23 54.2 V 703
2021-11-05 06:23:55 S 03 04 33.362 +28 13 24.46 V C57
2021-11-05 06:23:55 s 1 -162875.03 4 +96005.577 30.0 C57
2021-11-05 06:33:55 S 03 04 33.919 +28 13 32.52 V C57
2021-11-05 06:33:55 s 1 -162744.61 9 +95105.762 5350.0 C57
2021-11-05 06:43:55 S 03 04 34.534 +28 13 38.46 V C57
2021-11-05 06:43:55 s 1 -162611.17 1 +94204.176 9600.0 C57
2021-11-05 06:53:55 S 03 04 35.165 +28 13 44.76 V C57
2021-11-05 06:53:55 s 1 -162474.66 5 +93300.820 2710.0 C57
2021-11-05 07:03:55 S 03 04 35.784 +28 13 50.59 V C57
2021-11-05 07:03:55 s 1 -162335.08 0 +92395.696 4580.0 C57
2021-11-05 07:13:55 S 03 04 36.377 +28 13 56.78 V C57
2021-11-05 07:13:55 s 1 -162192.39 0 +91488.806 5140.0 C57
2021-11-05 07:23:55 S 03 04 37.037 +28 14 03.73 V C57
2021-11-05 07:23:55 s 1 -162046.57 2 +90580.152 4300.0 C57
2021-11-05 07:33:55 S 03 04 37.615 +28 14 11.04 V C57
2021-11-05 07:33:55 s 1 -161897.60 2 +89669.736 1970.0 C57
2021-11-05 07:43:55 S 03 04 38.220 +28 14 16.98 V C57
2021-11-05 07:43:55 s 1 -161745.45 4 +88757.561 8060.0 C57
2021-11-05 07:53:55 S 03 04 38.875 +28 14 23.03 V C57
2021-11-05 07:53:55 s 1 -161590.10 5 +87843.629 2490.0 C57
2021-11-05 08:03:55 S 03 04 39.516 +28 14 29.15 V C57
2021-11-05 08:03:55 s 1 -161431.52 8 +86927.944 5160.0 C57
2021-11-05 08:13:55 S 03 04 40.130 +28 14 36.20 V C57
2021-11-05 08:13:55 s 1 -161269.69 9 +86010.507 5980.0 C57
2021-11-05 08:23:55 S 03 04 40.798 +28 14 43.44 V C57
2021-11-05 08:23:55 s 1 -161104.59 1 +85091.323 4870.0 C57
2021-11-05 08:33:55 S 03 04 41.398 +28 14 50.10 V C57
2021-11-05 08:33:55 s 1 -160936.18 0 +84170.393 1720.0 C57
2021-11-05 08:43:55 S 03 04 42.108 +28 14 55.90 V C57
2021-11-05 08:43:55 s 1 -160764.43 8 +83247.722 6450.0 C57
2021-11-05 08:53:55 S 03 04 42.737 +28 15 02.02 V C57
2021-11-05 08:53:55 s 1 -160589.34 0 +82323.313 8960.0 C57
2021-11-05 09:03:55 S 03 04 43.349 +28 15 09.29 V C57
2021-11-05 09:03:55 s 1 -160410.85 8 +81397.169 9150.0 C57
2021-11-05 09:12:03 C 03 06 36.32 +28 26 18.6 t V40
2021-11-05 09:13:55 S 03 04 43.980 +28 15 16.67 V C57
2021-11-05 09:13:55 s 1 -160228.96 6 +80469.295 6930.0 C57
2021-11-05 09:23:55 S 03 04 44.616 +28 15 23.18 V C57
2021-11-05 09:23:55 s 1 -160043.63 5 +79539.694 2210.0 C57
2021-11-05 09:33:55 S 03 04 45.302 +28 15 29.09 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)