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
2021-11-02 14:13:55 s 1 -99061.324 0 +324280.59 9910.0 C57
2021-11-02 14:23:55 S 03 02 34.274 +27 38 25.80 V C57
2021-11-02 14:23:55 s 1 -99375.912 0 +323948.71 2880.0 C57
2021-11-02 14:33:55 S 03 02 34.334 +27 38 32.60 V C57
2021-11-02 14:33:55 s 1 -99690.127 0 +323615.64 4410.0 C57
2021-11-02 14:43:55 S 03 02 34.483 +27 38 37.61 V C57
2021-11-02 14:43:55 s 1 -100003.96 7 +323281.40 4510.0 C57
2021-11-02 14:53:55 S 03 02 34.577 +27 38 42.40 V C57
2021-11-02 14:53:55 s 1 -100317.43 0 +322945.98 3160.0 C57
2021-11-02 15:03:55 S 03 02 34.694 +27 38 46.93 V C57
2021-11-02 15:03:55 s 1 -100630.51 5 +322609.38 360.0 C57
2021-11-02 15:13:55 S 03 02 34.822 +27 38 52.98 V C57
2021-11-02 15:13:55 s 1 -100943.21 9 +322271.60 6110.0 C57
2021-11-02 15:23:55 S 03 02 34.954 +27 38 58.67 V C57
2021-11-02 15:23:55 s 1 -101255.54 2 +321932.64 390.0 C57
2021-11-02 15:33:55 S 03 02 35.069 +27 39 03.56 V C57
2021-11-02 15:33:55 s 1 -101567.48 0 +321592.50 3190.0 C57
2021-11-02 15:43:55 S 03 02 35.220 +27 39 08.82 V C57
2021-11-02 15:43:55 s 1 -101879.03 2 +321251.17 4520.0 C57
2021-11-02 15:53:55 S 03 02 35.328 +27 39 13.75 V C57
2021-11-02 15:53:55 s 1 -102190.19 6 +320908.66 4370.0 C57
2021-11-02 16:03:55 S 03 02 35.455 +27 39 20.02 V C57
2021-11-02 16:03:55 s 1 -102500.97 1 +320564.96 2720.0 C57
2021-11-02 16:12:08 C 03 05 38.68 +27 33 49.5 V C40
2021-11-02 16:13:42 C 03 05 38.71 +27 33 50.7 V C40
2021-11-02 16:13:55 S 03 02 35.566 +27 39 24.48 V C57
2021-11-02 16:13:55 s 1 -102811.35 5 +320220.08 9570.0 C57
2021-11-02 16:15:16 C 03 05 38.74 +27 33 52.1 V C40
2021-11-02 16:23:55 S 03 02 35.669 +27 39 29.59 V C57
2021-11-02 16:23:55 s 1 -103121.34 5 +319874.00 4920.0 C57
2021-11-02 16:27:51 C 03 05 38.90 +27 34 02.6 V C40
2021-11-02 16:29:26 C 03 05 38.90 +27 34 03.7 V C40
2021-11-02 16:30:59 C 03 05 38.93 +27 34 05.3 V C40
2021-11-02 16:33:55 S 03 02 35.875 +27 39 34.63 V C57
2021-11-02 16:33:55 s 1 -103430.93 9 +319526.74 8760.0 C57
2021-11-02 16:43:55 S 03 02 35.998 +27 39 40.21 V C57
2021-11-02 16:43:55 s 1 -103740.13 7 +319178.30 1080.0 C57
2021-11-02 16:53:55 S 03 02 36.108 +27 39 46.15 V C57
2021-11-02 16:53:55 s 1 -104048.93 6 +318828.66 1870.0 C57
2021-11-02 17:03:55 S 03 02 36.242 +27 39 50.69 V C57
2021-11-02 17:03:55 s 1 -104357.33 4 +318477.82 1130.0 C57
2021-11-02 17:13:55 S 03 02 36.370 +27 39 55.33 V C57
2021-11-02 17:13:55 s 1 -104665.32 8 +318125.80 8850.0 C57
2021-11-02 17:23:55 S 03 02 36.516 +27 40 00.08 V C57
2021-11-02 17:23:55 s 1 -104972.91 9 +317772.58 5020.0 C57
2021-11-02 17:33:55 S 03 02 36.670 +27 40 06.71 V C57
2021-11-02 17:33:55 s 1 -105280.10 2 +317418.17 9640.0 C57
2021-11-02 17:43:55 S 03 02 36.778 +27 40 12.40 V C57
2021-11-02 17:43:55 s 1 -105586.87 7 +317062.56 2690.0 C57
2021-11-02 17:53:55 S 03 02 36.917 +27 40 16.82 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)