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
2021-10-26 10:43:56 s 1 +171801.67 7 +77805.829 7000.0 C57
2021-10-26 10:53:56 S 03 03 15.151 +25 50 15.72 V C57
2021-10-26 10:53:56 s 1 +171998.78 9 +78698.362 5970.0 C57
2021-10-26 11:03:56 S 03 03 15.137 +25 50 24.90 V C57
2021-10-26 11:03:56 s 1 +172192.71 7 +79589.437 4150.0 C57
2021-10-26 11:13:56 S 03 03 15.125 +25 50 32.82 V C57
2021-10-26 11:13:56 s 1 +172383.48 1 +80479.049 1600.0 C57
2021-10-26 11:23:56 S 03 03 15.180 +25 50 42.04 V C57
2021-10-26 11:23:56 s 1 +172571.10 6 +81367.194 8400.0 C57
2021-10-26 11:33:56 S 03 03 15.079 +25 50 50.17 V C57
2021-10-26 11:33:56 s 1 +172755.61 2 +82253.869 4630.0 C57
2021-10-26 11:43:56 S 03 03 15.101 +25 50 58.88 V C57
2021-10-26 11:43:56 s 1 +172937.02 2 +83139.068 370.0 C57
2021-10-26 11:49:22 C 03 02 42.67 +25 36 51.6 V T08
2021-10-26 11:53:56 S 03 03 15.024 +25 51 08.93 V C57
2021-10-26 11:53:56 s 1 +173115.35 7 +84022.788 5680.0 C57
2021-10-26 11:54:01 C 03 02 42.69 +25 36 54.4 V T08
2021-10-26 12:02:38 C 03 02 42.74 +25 36 59.6 V T08
2021-10-26 12:03:56 S 03 03 15.017 +25 51 16.24 V C57
2021-10-26 12:03:56 s 1 +173290.63 8 +84905.026 650.0 C57
2021-10-26 12:13:56 S 03 03 14.858 +25 51 25.70 V C57
2021-10-26 12:13:56 s 1 +173462.88 7 +85785.777 5340.0 C57
2021-10-26 12:23:56 S 03 03 14.842 +25 51 33.80 V C57
2021-10-26 12:23:56 s 1 +173632.12 5 +86665.038 9830.0 C57
2021-10-26 12:26:01 C 03 02 42.88 +25 37 13.3 V T08
2021-10-26 12:33:56 S 03 03 14.808 +25 51 44.24 V C57
2021-10-26 12:33:56 s 1 +173798.37 3 +87542.805 4190.0 C57
2021-10-26 12:43:56 S 03 03 14.714 +25 51 51.19 V C57
2021-10-26 12:43:56 s 1 +173961.65 0 +88419.076 8490.0 C57
2021-10-26 12:53:56 S 03 03 14.642 +25 52 00.70 V C57
2021-10-26 12:53:56 s 1 +174121.97 8 +89293.847 2800.0 C57
2021-10-26 13:03:56 S 03 03 14.650 +25 52 09.48 V C57
2021-10-26 13:03:56 s 1 +174279.37 7 +90167.115 7190.0 C57
2021-10-26 13:13:56 S 03 03 14.611 +25 52 17.98 V C57
2021-10-26 13:13:56 s 1 +174433.86 7 +91038.877 1730.0 C57
2021-10-26 13:23:56 S 03 03 14.438 +25 52 30.04 V C57
2021-10-26 13:23:56 s 1 +174585.46 8 +91909.130 6480.0 C57
2021-10-26 13:43:56 S 03 03 14.503 +25 52 45.30 V C57
2021-10-26 13:43:56 s 1 +174880.08 0 +93645.098 6920.0 C57
2021-10-26 13:53:56 S 03 03 14.333 +25 52 52.72 V C57
2021-10-26 13:53:56 s 1 +175023.13 0 +94510.809 2730.0 C57
2021-10-26 14:03:56 S 03 03 14.254 +25 53 01.72 V C57
2021-10-26 14:03:56 s 1 +175163.36 9 +95375.000 9020.0 C57
2021-10-26 14:13:56 S 03 03 14.201 +25 53 09.49 V C57
2021-10-26 14:13:56 s 1 +175300.81 5 +96237.669 5870.0 C57
2021-10-26 14:23:56 S 03 03 14.088 +25 53 17.63 V C57
2021-10-26 14:23:56 s 1 +175435.48 7 +97098.815 3320.0 C57
2021-10-26 14:33:56 S 03 03 14.158 +25 53 27.85 V C57
2021-10-26 14:33:56 s 1 +175567.40 4 +97958.435 1460.0 C57
2021-10-26 14:43:56 S 03 03 14.011 +25 53 36.02 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)