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 17:43:55 S 03 03 04.236 +27 52 45.34 V C57
2021-11-03 17:43:55 s 1 -144332.05 5 +252751.59 5290.0 C57
2021-11-03 17:53:55 S 03 03 04.478 +27 52 50.09 V C57
2021-11-03 17:53:55 s 1 -144553.74 6 +252209.01 7680.0 C57
2021-11-03 18:03:55 S 03 03 04.711 +27 52 56.46 V C57
2021-11-03 18:03:55 s 1 -144774.62 2 +251665.03 7020.0 C57
2021-11-03 18:13:55 S 03 03 04.951 +27 53 02.51 V C57
2021-11-03 18:13:55 s 1 -144994.68 1 +251119.65 3300.0 C57
2021-11-03 18:23:55 S 03 03 05.249 +27 53 07.73 V C57
2021-11-03 18:23:55 s 1 -145213.91 8 +250572.86 6510.0 C57
2021-11-03 18:33:55 S 03 03 05.448 +27 53 12.01 V C57
2021-11-03 18:33:55 s 1 -145432.32 8 +250024.66 6640.0 C57
2021-11-03 18:43:55 S 03 03 05.714 +27 53 16.87 V C57
2021-11-03 18:43:55 s 1 -145649.90 9 +249475.06 3670.0 C57
2021-11-03 18:53:55 S 03 03 06.034 +27 53 23.17 V C57
2021-11-03 18:53:55 s 1 -145866.65 5 +248924.04 7580.0 C57
2021-11-03 19:03:55 S 03 03 06.276 +27 53 28.90 V C57
2021-11-03 19:03:55 s 1 -146082.56 3 +248371.61 8360.0 C57
2021-11-03 19:13:55 S 03 03 06.535 +27 53 33.61 V C57
2021-11-03 19:13:55 s 1 -146297.62 9 +247817.76 6000.0 C57
2021-11-03 19:23:55 S 03 03 06.763 +27 53 38.00 V C57
2021-11-03 19:23:55 s 1 -146511.84 8 +247262.50 480.0 C57
2021-11-03 19:33:55 S 03 03 07.020 +27 53 43.48 V C57
2021-11-03 19:33:55 s 1 -146725.21 6 +246705.82 1780.0 C57
2021-11-03 19:43:55 S 03 03 07.404 +27 53 49.20 V C57
2021-11-03 19:43:55 s 1 -146937.72 8 +246147.71 9890.0 C57
2021-11-03 19:53:55 S 03 03 07.634 +27 53 54.96 V C57
2021-11-03 19:53:55 s 1 -147149.38 2 +245588.19 4790.0 C57
2021-11-03 20:03:55 S 03 03 07.853 +27 53 59.71 V C57
2021-11-03 20:03:55 s 1 -147360.17 2 +245027.24 6470.0 C57
2021-11-03 20:13:55 S 03 03 08.179 +27 54 04.25 V C57
2021-11-03 20:13:55 s 1 -147570.09 4 +244464.86 4910.0 C57
2021-11-03 20:23:55 S 03 03 08.429 +27 54 09.29 V C57
2021-11-03 20:23:55 s 1 -147779.14 4 +243901.06 90.0 C57
2021-11-03 20:33:55 S 03 03 08.681 +27 54 15.44 V C57
2021-11-03 20:33:55 s 1 -147987.31 7 +243335.82 2010.0 C57
2021-11-03 20:43:55 S 03 03 08.969 +27 54 21.49 V C57
2021-11-03 20:43:55 s 1 -148194.60 9 +242769.15 640.0 C57
2021-11-03 20:53:55 S 03 03 09.192 +27 54 26.89 V C57
2021-11-03 20:53:55 s 1 -148401.01 6 +242201.05 5970.0 C57
2021-11-03 21:03:55 S 03 03 09.547 +27 54 31.25 V C57
2021-11-03 21:03:55 s 1 -148606.53 3 +241631.51 7980.0 C57
2021-11-03 21:13:55 S 03 03 09.770 +27 54 36.50 V C57
2021-11-03 21:13:55 s 1 -148811.15 6 +241060.53 6660.0 C57
2021-11-03 21:23:55 S 03 03 10.044 +27 54 42.01 V C57
2021-11-03 21:23:55 s 1 -149014.87 9 +240488.12 1980.0 C57
2021-11-03 21:33:55 S 03 03 10.342 +27 54 48.24 V C57
2021-11-03 21:33:55 s 1 -149217.70 0 +239914.26 3940.0 C57
2021-11-03 21:43:55 S 03 03 10.615 +27 54 53.28 V C57
2021-11-03 21:43:55 s 1 -149419.61 3 +239338.96 2520.0 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)