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
2021-10-21 21:23:56 s 1 -154463.37 7 +244814.64 9120.0 C57
2021-10-21 21:33:56 S 02 58 34.150 +24 30 18.00 V C57
2021-10-21 21:33:56 s 1 -154675.74 1 +244260.00 7000.0 C57
2021-10-21 21:43:56 S 02 58 34.392 +24 30 22.00 V C57
2021-10-21 21:43:56 s 1 -154887.23 4 +243703.97 1720.0 C57
2021-10-21 21:53:56 S 02 58 34.692 +24 30 26.78 V C57
2021-10-21 21:53:56 s 1 -155097.85 0 +243146.56 3290.0 C57
2021-10-21 22:03:56 S 02 58 34.973 +24 30 30.78 V C57
2021-10-21 22:03:56 s 1 -155307.58 6 +242587.76 1680.0 C57
2021-10-21 22:13:56 S 02 58 35.335 +24 30 34.42 V C57
2021-10-21 22:13:56 s 1 -155516.43 6 +242027.57 6880.0 C57
2021-10-21 22:23:56 S 02 58 35.549 +24 30 38.59 V C57
2021-10-21 22:23:56 s 1 -155724.39 8 +241465.99 8880.0 C57
2021-10-21 22:33:56 S 02 58 35.878 +24 30 41.51 V C57
2021-10-21 22:33:56 s 1 -155931.46 7 +240903.02 7660.0 C57
2021-10-21 22:43:56 S 02 58 36.266 +24 30 45.14 V C57
2021-10-21 22:43:56 s 1 -156137.63 7 +240338.66 3200.0 C57
2021-10-21 22:53:56 S 02 58 36.473 +24 30 49.03 V C57
2021-10-21 22:53:56 s 1 -156342.90 6 +239772.89 5490.0 C57
2021-10-21 23:03:56 S 02 58 36.749 +24 30 53.28 V C57
2021-10-21 23:03:56 s 1 -156547.26 8 +239205.74 4520.0 C57
2021-10-21 23:13:56 S 02 58 37.133 +24 30 57.10 V C57
2021-10-21 23:13:56 s 1 -156750.72 0 +238637.18 270.0 C57
2021-10-21 23:23:56 S 02 58 37.387 +24 31 02.28 V C57
2021-10-21 23:23:56 s 1 -156953.25 6 +238067.22 2730.0 C57
2021-10-21 23:33:56 S 02 58 37.666 +24 31 04.98 V C57
2021-10-21 23:33:56 s 1 -157154.87 3 +237495.86 1870.0 C57
2021-10-21 23:43:56 S 02 58 37.951 +24 31 08.65 V C57
2021-10-21 23:43:56 s 1 -157355.56 5 +236923.09 7690.0 C57
2021-10-21 23:53:56 S 02 58 38.345 +24 31 13.73 V C57
2021-10-21 23:53:56 s 1 -157555.32 9 +236348.92 160.0 C57
2021-10-22 00:03:56 S 02 58 38.604 +24 31 17.54 V C57
2021-10-22 00:03:56 s 1 -157754.16 0 +235773.35 9280.0 C57
2021-10-22 00:13:56 S 02 58 38.914 +24 31 20.28 V C57
2021-10-22 00:13:56 s 1 -157952.05 3 +235196.36 5020.0 C57
2021-10-22 00:23:56 S 02 58 39.223 +24 31 23.41 V C57
2021-10-22 00:23:56 s 1 -158149.00 4 +234617.97 7380.0 C57
2021-10-22 00:33:56 S 02 58 39.547 +24 31 27.91 V C57
2021-10-22 00:33:56 s 1 -158345.00 8 +234038.16 6330.0 C57
2021-10-22 00:43:56 S 02 58 39.782 +24 31 32.23 V C57
2021-10-22 00:43:56 s 1 -158540.06 0 +233456.94 1850.0 C57
2021-10-22 00:47:14 C 03 00 36.24 +24 34 11.7 V C40
2021-10-22 00:53:56 S 02 58 40.090 +24 31 36.44 V C57
2021-10-22 00:53:56 s 1 -158734.15 6 +232874.30 3940.0 C57
2021-10-22 01:01:23 C 03 00 36.45 +24 34 19.2 V C40
2021-10-22 01:03:56 S 02 58 40.392 +24 31 39.72 V C57
2021-10-22 01:03:56 s 1 -158927.29 1 +232290.25 2580.0 C57
2021-10-22 01:04:31 C 03 00 36.50 +24 34 21.0 V C40
2021-10-22 01:13:56 S 02 58 40.786 +24 31 43.75 V C57
2021-10-22 01:13:56 s 1 -159119.46 0 +231704.78 7740.0 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)