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 18:23:55 s 1 -165557.09 3 +156124.24 3240.0 C57
2021-11-04 18:33:55 S 03 03 55.836 +28 06 18.04 V C57
2021-11-04 18:33:55 s 1 -165596.50 9 +155351.56 530.0 C57
2021-11-04 18:43:55 S 03 03 56.314 +28 06 24.23 V C57
2021-11-04 18:43:55 s 1 -165634.08 8 +154577.16 1060.0 C57
2021-11-04 18:53:55 S 03 03 56.810 +28 06 29.56 V C57
2021-11-04 18:53:55 s 1 -165669.81 8 +153801.04 4790.0 C57
2021-11-04 19:03:55 S 03 03 57.266 +28 06 34.96 V C57
2021-11-04 19:03:55 s 1 -165703.68 7 +153023.20 1680.0 C57
2021-11-04 19:13:55 S 03 03 57.715 +28 06 40.28 V C57
2021-11-04 19:13:55 s 1 -165735.68 2 +152243.63 1680.0 C57
2021-11-04 19:23:55 S 03 03 58.234 +28 06 46.33 V C57
2021-11-04 19:23:55 s 1 -165765.79 3 +151462.34 4740.0 C57
2021-11-04 19:33:55 S 03 03 58.627 +28 06 53.03 V C57
2021-11-04 19:33:55 s 1 -165794.00 7 +150679.32 830.0 C57
2021-11-04 19:43:55 S 03 03 59.066 +28 06 58.90 V C57
2021-11-04 19:43:55 s 1 -165820.31 2 +149894.58 9910.0 C57
2021-11-04 19:53:55 S 03 03 59.592 +28 07 04.08 V C57
2021-11-04 19:53:55 s 1 -165844.69 5 +149108.10 1910.0 C57
2021-11-04 20:03:55 S 03 04 00.067 +28 07 09.66 V C57
2021-11-04 20:03:55 s 1 -165867.14 3 +148319.88 6810.0 C57
2021-11-04 20:13:55 S 03 04 00.535 +28 07 15.02 V C57
2021-11-04 20:13:55 s 1 -165887.64 5 +147529.93 4560.0 C57
2021-11-04 20:15:00 C 03 06 26.58 +28 15 18.7 V C40
2021-11-04 20:18:04 C 03 06 26.60 +28 15 21.3 V C40
2021-11-04 20:19:37 C 03 06 26.60 +28 15 22.5 V C40
2021-11-04 20:21:21 C 03 06 26.61 +28 15 24.1 V C40
2021-11-04 20:22:55 C 03 06 26.63 +28 15 25.4 V C40
2021-11-04 20:23:55 S 03 04 01.018 +28 07 20.96 V C57
2021-11-04 20:23:55 s 1 -165906.18 8 +146738.24 5100.0 C57
2021-11-04 20:24:29 C 03 06 26.64 +28 15 26.8 V C40
2021-11-04 20:26:02 C 03 06 26.64 +28 15 28.1 V C40
2021-11-04 20:27:37 C 03 06 26.64 +28 15 29.4 V C40
2021-11-04 20:30:46 C 03 06 26.65 +28 15 32.1 V C40
2021-11-04 20:33:55 S 03 04 01.438 +28 07 28.06 V C57
2021-11-04 20:33:55 s 1 -165922.75 9 +145944.82 8400.0 C57
2021-11-04 20:43:55 S 03 04 01.966 +28 07 33.17 V C57
2021-11-04 20:43:55 s 1 -165937.34 4 +145149.65 4410.0 C57
2021-11-04 20:48:16 n 03 06 28.10 +28 15 33.4 q Z92
2021-11-04 20:53:55 S 03 04 02.443 +28 07 38.89 V C57
2021-11-04 20:53:55 s 1 -165949.93 2 +144352.74 3070.0 C57
2021-11-04 21:03:55 S 03 04 02.933 +28 07 43.82 V C57
2021-11-04 21:03:55 s 1 -165960.50 8 +143554.08 4350.0 C57
2021-11-04 21:13:55 S 03 04 03.415 +28 07 49.69 V C57
2021-11-04 21:13:55 s 1 -165969.06 0 +142753.68 8190.0 C57
2021-11-04 21:20:51 n 03 06 28.40 +28 16 02.3 q Z92
2021-11-04 21:23:55 S 03 04 03.886 +28 07 56.82 V C57
2021-11-04 21:23:55 s 1 -165975.57 4 +141951.53 4550.0 C57
2021-11-04 21:33:55 S 03 04 04.368 +28 08 02.87 V C57
2021-11-04 21:33:55 s 1 -165980.03 6 +141147.63 3380.0 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)