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
2021-10-27 22:33:56 s 1 +165267.39 9 +234859.89 9770.0 C57
2021-10-27 22:43:56 S 03 02 57.391 +26 18 22.93 V C57
2021-10-27 22:43:56 s 1 +165083.85 5 +235433.26 8360.0 C57
2021-10-27 22:53:56 S 03 02 57.310 +26 18 28.66 V C57
2021-10-27 22:53:56 s 1 +164899.36 7 +236005.27 3820.0 C57
2021-10-27 23:03:56 S 03 02 57.211 +26 18 37.37 V C57
2021-10-27 23:03:56 s 1 +164713.94 1 +236575.93 6160.0 C57
2021-10-27 23:05:30 C 03 03 21.30 +25 58 35.1 Y 557
2021-10-27 23:13:56 S 03 02 57.122 +26 18 44.75 V C57
2021-10-27 23:13:56 s 1 +164527.57 9 +237145.24 5390.0 C57
2021-10-27 23:23:56 S 03 02 57.026 +26 18 50.80 V C57
2021-10-27 23:23:56 s 1 +164340.28 7 +237713.19 1530.0 C57
2021-10-27 23:33:56 S 03 02 56.921 +26 18 59.18 V C57
2021-10-27 23:33:56 s 1 +164152.06 9 +238279.81 4590.0 C57
2021-10-27 23:43:56 S 03 02 56.875 +26 19 05.48 V C57
2021-10-27 23:43:56 s 1 +163962.93 0 +238845.07 4590.0 C57
2021-10-27 23:53:56 S 03 02 56.794 +26 19 12.58 V C57
2021-10-27 23:53:56 s 1 +163772.87 3 +239408.99 1540.0 C57
2021-10-28 00:03:56 S 03 02 56.645 +26 19 19.88 V C57
2021-10-28 00:03:56 s 1 +163581.90 3 +239971.57 5450.0 C57
2021-10-28 00:13:56 S 03 02 56.515 +26 19 27.16 V C57
2021-10-28 00:13:56 s 1 +163390.02 3 +240532.81 6350.0 C57
2021-10-28 00:17:45 C 03 03 21.90 +25 59 21.2 Y 557
2021-10-28 00:33:56 S 03 02 56.345 +26 19 41.16 V C57
2021-10-28 00:33:56 s 1 +163003.55 4 +241651.26 9140.0 C57
2021-10-28 00:43:56 S 03 02 56.184 +26 19 48.00 V C57
2021-10-28 00:43:56 s 1 +162808.97 3 +242208.47 1070.0 C57
2021-10-28 00:53:56 S 03 02 56.134 +26 19 54.55 V C57
2021-10-28 00:53:56 s 1 +162613.49 9 +242764.36 30.0 C57
2021-10-28 01:03:56 S 03 02 56.026 +26 20 02.69 V C57
2021-10-28 01:03:56 s 1 +162417.13 8 +243318.90 6040.0 C57
2021-10-28 01:13:56 S 03 02 55.877 +26 20 08.88 V C57
2021-10-28 01:13:56 s 1 +162219.89 2 +243872.12 9110.0 C57
2021-10-28 01:15:40 C 03 03 22.40 +25 59 57.3 Y 557
2021-10-28 01:23:56 S 03 02 55.817 +26 20 16.30 V C57
2021-10-28 01:23:56 s 1 +162021.76 5 +244424.00 9270.0 C57
2021-10-28 01:33:56 S 03 02 55.646 +26 20 23.42 V C57
2021-10-28 01:33:56 s 1 +161822.76 3 +244974.55 6520.0 C57
2021-10-28 01:43:56 S 03 02 55.598 +26 20 29.69 V C57
2021-10-28 01:43:56 s 1 +161622.88 9 +245523.77 870.0 C57
2021-10-28 01:53:56 S 03 02 55.486 +26 20 37.43 V C57
2021-10-28 01:53:56 s 1 +161422.14 6 +246071.66 2340.0 C57
2021-10-28 02:03:56 S 03 02 55.337 +26 20 44.38 V C57
2021-10-28 02:03:56 s 1 +161220.53 9 +246618.23 950.0 C57
2021-10-28 02:13:56 S 03 02 55.296 +26 20 50.82 V C57
2021-10-28 02:13:56 s 1 +161018.07 3 +247163.47 6700.0 C57
2021-10-28 02:16:40 C 03 03 22.99 +26 00 34.6 Y 557
2021-10-28 02:23:56 S 03 02 55.217 +26 20 58.56 V C57
2021-10-28 02:23:56 s 1 +160814.74 9 +247707.39 9610.0 C57
2021-10-28 02:33:56 S 03 02 55.166 +26 21 05.22 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)