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
2021-10-15 18:03:56 s 1 +137014.64 7 +283813.52 1630.0 C57
2021-10-15 18:13:56 S 02 56 27.917 +23 28 57.86 V C57
2021-10-15 18:13:56 s 1 +136747.76 1 +284262.51 3710.0 C57
2021-10-15 18:23:56 S 02 56 27.979 +23 29 02.04 V C57
2021-10-15 18:23:56 s 1 +136480.26 7 +284710.23 3790.0 C57
2021-10-15 18:33:56 S 02 56 28.099 +23 29 07.15 V C57
2021-10-15 18:33:56 s 1 +136212.16 8 +285156.69 1850.0 C57
2021-10-15 18:43:56 S 02 56 27.994 +23 29 10.07 V C57
2021-10-15 18:43:56 s 1 +135943.46 7 +285601.88 7920.0 C57
2021-10-15 18:53:56 S 02 56 28.174 +23 29 15.65 V C57
2021-10-15 18:53:56 s 1 +135674.16 7 +286045.82 2010.0 C57
2021-10-15 19:03:56 S 02 56 28.346 +23 29 23.82 V C57
2021-10-15 19:03:56 s 1 +135404.26 9 +286488.50 4110.0 C57
2021-10-15 20:13:56 S 02 56 28.553 +23 29 55.57 V C57
2021-10-15 20:13:56 s 1 +133498.49 6 +289552.12 4230.0 C57
2021-10-15 20:33:56 S 02 56 28.994 +23 30 05.69 V C57
2021-10-15 20:33:56 s 1 +132948.76 9 +290416.19 5540.0 C57
2021-10-15 20:43:56 S 02 56 28.812 +23 30 09.18 V C57
2021-10-15 20:43:56 s 1 +132673.04 7 +290846.35 8360.0 C57
2021-10-15 20:53:56 S 02 56 29.124 +23 30 15.98 V C57
2021-10-15 20:53:56 s 1 +132396.75 8 +291275.26 9300.0 C57
2021-10-15 21:03:56 S 02 56 29.162 +23 30 20.84 V C57
2021-10-15 21:03:56 s 1 +132119.90 4 +291702.94 8370.0 C57
2021-10-15 21:13:56 S 02 56 29.357 +23 30 25.70 V C57
2021-10-15 21:13:56 s 1 +131842.48 6 +292129.36 5570.0 C57
2021-10-15 21:23:56 S 02 56 29.134 +23 30 27.79 V C57
2021-10-15 21:23:56 s 1 +131564.50 8 +292554.55 930.0 C57
2021-10-15 21:33:56 S 02 56 29.374 +23 30 34.45 V C57
2021-10-15 21:33:56 s 1 +131285.97 2 +292978.50 4430.0 C57
2021-10-15 21:43:56 S 02 56 29.422 +23 30 39.24 V C57
2021-10-15 21:43:56 s 1 +131006.88 0 +293401.21 6100.0 C57
2021-10-15 21:53:56 S 02 56 29.386 +23 30 44.06 V C57
2021-10-15 21:53:56 s 1 +130727.23 5 +293822.67 5940.0 C57
2021-10-15 22:03:56 S 02 56 29.417 +23 30 49.43 V C57
2021-10-15 22:03:56 s 1 +130447.04 0 +294242.91 3960.0 C57
2021-10-15 22:13:56 S 02 56 29.724 +23 30 54.07 V C57
2021-10-15 22:13:56 s 1 +130166.29 7 +294661.90 170.0 C57
2021-10-15 22:23:56 S 02 56 29.633 +23 30 59.44 V C57
2021-10-15 22:23:56 s 1 +129885.00 9 +295079.66 4570.0 C57
2021-10-15 22:33:56 S 02 56 29.722 +23 31 04.12 V C57
2021-10-15 22:33:56 s 1 +129603.17 7 +295496.19 7180.0 C57
2021-10-15 22:43:56 S 02 56 29.767 +23 31 09.48 V C57
2021-10-15 22:43:56 s 1 +129320.80 5 +295911.48 8010.0 C57
2021-10-15 22:53:56 S 02 56 29.894 +23 31 13.37 V C57
2021-10-15 22:53:56 s 1 +129037.89 4 +296325.54 7050.0 C57
2021-10-15 23:03:56 S 02 56 29.957 +23 31 19.99 V C57
2021-10-15 23:03:56 s 1 +128754.44 8 +296738.37 4330.0 C57
2021-10-15 23:13:56 S 02 56 30.022 +23 31 23.81 V C57
2021-10-15 23:13:56 s 1 +128470.46 8 +297149.98 9840.0 C57
2021-10-15 23:23:56 S 02 56 30.113 +23 31 27.55 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)