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 00:53:55 s 1 -72834.149 0 +347097.97 5410.0 C57
2021-11-02 01:13:55 S 03 02 26.486 +27 31 29.96 V C57
2021-11-02 01:13:55 s 1 -73512.124 0 +346615.76 690.0 C57
2021-11-02 01:23:55 S 03 02 26.580 +27 31 35.87 V C57
2021-11-02 01:23:55 s 1 -73850.740 0 +346372.98 6860.0 C57
2021-11-02 01:33:55 S 03 02 26.626 +27 31 41.34 V C57
2021-11-02 01:33:55 s 1 -74189.106 0 +346129.09 2050.0 C57
2021-11-02 01:43:56 S 03 02 26.714 +27 31 46.24 V C57
2021-11-02 01:43:56 s 1 -74527.221 0 +345884.09 6250.0 C57
2021-11-02 02:03:56 S 03 02 26.930 +27 31 56.68 V C57
2021-11-02 02:03:56 s 1 -75202.691 0 +345390.74 1670.0 C57
2021-11-02 02:13:55 S 03 02 26.971 +27 32 02.65 V C57
2021-11-02 02:13:55 s 1 -75540.043 0 +345142.40 2870.0 C57
2021-11-02 02:23:55 S 03 02 27.067 +27 32 07.66 V C57
2021-11-02 02:23:55 s 1 -75877.139 0 +344892.93 3070.0 C57
2021-11-02 02:33:55 S 03 02 27.125 +27 32 12.70 V C57
2021-11-02 02:33:55 s 1 -76213.976 0 +344642.35 2250.0 C57
2021-11-02 02:53:55 S 03 02 27.228 +27 32 23.53 V C57
2021-11-02 02:53:55 s 1 -76886.871 0 +344137.84 7550.0 C57
2021-11-02 03:03:55 S 03 02 27.355 +27 32 28.86 V C57
2021-11-02 03:03:55 s 1 -77222.925 0 +343883.90 3650.0 C57
2021-11-02 03:13:56 S 03 02 27.456 +27 32 33.54 V C57
2021-11-02 03:13:56 s 1 -77558.715 0 +343628.85 8730.0 C57
2021-11-02 03:23:55 S 03 02 27.545 +27 32 38.36 V C57
2021-11-02 03:23:55 s 1 -77894.239 0 +343372.67 2760.0 C57
2021-11-02 03:33:56 S 03 02 27.626 +27 32 43.94 V C57
2021-11-02 03:33:56 s 1 -78229.497 0 +343115.37 5750.0 C57
2021-11-02 03:43:55 S 03 02 27.713 +27 32 50.60 V C57
2021-11-02 03:43:55 s 1 -78564.486 0 +342856.95 7680.0 C57
2021-11-02 03:53:55 S 03 02 27.792 +27 32 55.43 V C57
2021-11-02 03:53:55 s 1 -78899.206 0 +342597.41 8560.0 C57
2021-11-02 04:03:55 S 03 02 27.838 +27 33 00.00 V C57
2021-11-02 04:03:55 s 1 -79233.655 0 +342336.74 8380.0 C57
2021-11-02 04:13:55 S 03 02 27.941 +27 33 05.51 V C57
2021-11-02 04:13:55 s 1 -79567.830 0 +342074.95 7130.0 C57
2021-11-02 04:23:55 S 03 02 27.996 +27 33 12.28 V C57
2021-11-02 04:23:55 s 1 -79901.732 0 +341812.04 4820.0 C57
2021-11-02 04:33:55 S 03 02 28.126 +27 33 16.81 V C57
2021-11-02 04:33:55 s 1 -80235.358 0 +341548.00 1420.0 C57
2021-11-02 04:43:56 S 03 02 28.236 +27 33 20.70 V C57
2021-11-02 04:43:56 s 1 -80568.707 0 +341282.83 6940.0 C57
2021-11-02 04:53:55 S 03 02 28.356 +27 33 26.71 V C57
2021-11-02 04:53:55 s 1 -80901.777 0 +341016.54 1370.0 C57
2021-11-02 05:03:56 S 03 02 28.423 +27 33 33.16 V C57
2021-11-02 05:03:56 s 1 -81234.568 0 +340749.12 4720.0 C57
2021-11-02 05:53:55 S 03 02 28.865 +27 33 57.71 V C57
2021-11-02 05:53:55 s 1 -82894.266 0 +339395.06 4830.0 C57
2021-11-02 06:03:55 S 03 02 28.937 +27 34 03.50 V C57
2021-11-02 06:03:55 s 1 -83225.345 0 +339120.86 1500.0 C57
2021-11-02 06:13:56 S 03 02 29.006 +27 34 07.90 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)