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
2021-11-03 01:33:55 S 03 02 43.846 +27 44 16.91 V C57
2021-11-03 01:33:55 s 1 -119506.78 7 +298979.94 8470.0 C57
2021-11-03 01:43:55 S 03 02 44.102 +27 44 22.16 V C57
2021-11-03 01:43:55 s 1 -119791.50 5 +298565.62 7690.0 C57
2021-11-03 01:53:55 S 03 02 44.261 +27 44 27.46 V C57
2021-11-03 01:53:55 s 1 -120075.71 0 +298150.04 4960.0 C57
2021-11-03 02:03:55 S 03 02 44.393 +27 44 33.61 V C57
2021-11-03 02:03:55 s 1 -120359.39 8 +297733.22 280.0 C57
2021-11-03 02:13:55 S 03 02 44.534 +27 44 38.94 V C57
2021-11-03 02:13:55 s 1 -120642.56 7 +297315.14 3630.0 C57
2021-11-03 02:23:55 S 03 02 44.707 +27 44 42.72 V C57
2021-11-03 02:23:55 s 1 -120925.21 4 +296895.80 5010.0 C57
2021-11-03 02:33:55 S 03 02 44.950 +27 44 47.18 V C57
2021-11-03 02:33:55 s 1 -121207.33 8 +296475.20 4410.0 C57
2021-11-03 02:43:55 S 03 02 45.106 +27 44 54.24 V C57
2021-11-03 02:43:55 s 1 -121488.93 6 +296053.35 1820.0 C57
2021-11-03 02:53:55 S 03 02 45.276 +27 44 59.82 V C57
2021-11-03 02:53:55 s 1 -121770.00 4 +295630.23 7230.0 C57
2021-11-03 03:03:55 S 03 02 45.494 +27 45 04.46 V C57
2021-11-03 03:03:55 s 1 -122050.54 2 +295205.85 630.0 C57
2021-11-03 03:13:55 S 03 02 45.542 +27 45 09.07 V C57
2021-11-03 03:13:55 s 1 -122330.54 6 +294780.21 2010.0 C57
2021-11-03 03:23:55 S 03 02 45.780 +27 45 14.40 V C57
2021-11-03 03:23:55 s 1 -122610.01 3 +294353.31 1370.0 C57
2021-11-03 03:33:55 S 03 02 45.977 +27 45 20.23 V C57
2021-11-03 03:33:55 s 1 -122888.94 2 +293925.14 8690.0 C57
2021-11-03 03:43:55 S 03 02 46.102 +27 45 25.20 V C57
2021-11-03 03:43:55 s 1 -123167.33 0 +293495.70 3970.0 C57
2021-11-03 03:53:55 S 03 02 46.382 +27 45 29.81 V C57
2021-11-03 03:53:55 s 1 -123445.17 4 +293065.00 7190.0 C57
2021-11-03 04:03:55 S 03 02 46.433 +27 45 34.99 V C57
2021-11-03 04:03:55 s 1 -123722.47 2 +292633.02 8350.0 C57
2021-11-03 04:13:55 S 03 02 46.598 +27 45 40.14 V C57
2021-11-03 04:13:55 s 1 -123999.22 1 +292199.78 7430.0 C57
2021-11-03 04:23:55 S 03 02 46.831 +27 45 46.30 V C57
2021-11-03 04:23:55 s 1 -124275.41 9 +291765.26 4440.0 C57
2021-11-03 04:33:55 S 03 02 47.042 +27 45 51.37 V C57
2021-11-03 04:33:55 s 1 -124551.06 3 +291329.47 9350.0 C57
2021-11-03 04:43:55 S 03 02 47.198 +27 45 56.02 V C57
2021-11-03 04:43:55 s 1 -124826.15 0 +290892.40 2160.0 C57
2021-11-03 04:53:55 S 03 02 47.417 +27 46 00.62 V C57
2021-11-03 04:53:55 s 1 -125100.67 8 +290454.06 2860.0 C57
2021-11-03 05:03:55 S 03 02 47.566 +27 46 06.71 V C57
2021-11-03 05:03:55 s 1 -125374.64 5 +290014.43 1440.0 C57
2021-11-03 05:13:55 S 03 02 47.774 +27 46 12.50 V C57
2021-11-03 05:13:55 s 1 -125648.04 7 +289573.53 7890.0 C57
2021-11-03 05:23:55 S 03 02 47.964 +27 46 17.29 V C57
2021-11-03 05:23:55 s 1 -125920.88 2 +289131.35 2210.0 C57
2021-11-03 05:33:55 S 03 02 48.168 +27 46 22.01 V C57
2021-11-03 05:33:55 s 1 -126193.14 7 +288687.89 4370.0 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)