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
2021-10-14 19:23:56 s 1 +166235.17 4 +210390.68 1540.0 C57
2021-10-14 19:43:56 S 02 56 18.883 +23 17 25.98 V C57
2021-10-14 19:43:56 s 1 +165931.31 2 +211657.44 2750.0 C57
2021-10-14 19:53:56 S 02 56 18.929 +23 17 29.76 V C57
2021-10-14 19:53:56 s 1 +165777.65 1 +212288.62 2560.0 C57
2021-10-14 20:03:56 S 02 56 19.092 +23 17 36.10 V C57
2021-10-14 20:03:56 s 1 +165622.84 4 +212918.32 8530.0 C57
2021-10-14 20:13:56 S 02 56 19.330 +23 17 38.58 V C57
2021-10-14 20:13:56 s 1 +165466.89 6 +213546.57 680.0 C57
2021-10-14 20:23:56 S 02 56 19.433 +23 17 45.92 V C57
2021-10-14 20:23:56 s 1 +165309.81 4 +214173.35 9030.0 C57
2021-10-14 20:33:56 S 02 56 19.301 +23 17 52.98 V C57
2021-10-14 20:33:56 s 1 +165151.60 4 +214798.67 3610.0 C57
2021-10-14 20:53:56 S 02 56 19.601 +23 18 00.00 V C57
2021-10-14 20:53:56 s 1 +164831.82 0 +216044.93 1510.0 C57
2021-10-14 21:03:56 S 02 56 19.394 +23 18 06.59 V C57
2021-10-14 21:03:56 s 1 +164670.25 8 +216665.87 4860.0 C57
2021-10-14 21:13:56 S 02 56 19.510 +23 18 13.86 V C57
2021-10-14 21:13:56 s 1 +164507.59 0 +217285.37 4520.0 C57
2021-10-14 21:23:56 S 02 56 19.663 +23 18 15.08 V C57
2021-10-14 21:23:56 s 1 +164343.82 2 +217903.40 490.0 C57
2021-10-14 21:33:56 S 02 56 19.807 +23 18 19.69 V C57
2021-10-14 21:33:56 s 1 +164178.95 8 +218519.99 2800.0 C57
2021-10-14 21:53:56 S 02 56 19.865 +23 18 33.84 V C57
2021-10-14 21:53:56 s 1 +163845.96 9 +219748.82 6500.0 C57
2021-10-14 22:03:56 S 02 56 19.927 +23 18 39.06 V C57
2021-10-14 22:03:56 s 1 +163677.85 4 +220361.06 7920.0 C57
2021-10-14 22:13:56 S 02 56 19.843 +23 18 43.81 V C57
2021-10-14 22:13:56 s 1 +163508.66 6 +220971.86 5760.0 C57
2021-10-14 22:23:56 S 02 56 20.064 +23 18 47.52 V C57
2021-10-14 22:23:56 s 1 +163338.41 0 +221581.22 20.0 C57
2021-10-14 22:33:56 S 02 56 20.030 +23 18 55.80 V C57
2021-10-14 22:33:56 s 1 +163167.09 2 +222189.14 730.0 C57
2021-10-14 22:43:56 S 02 56 20.215 +23 19 02.53 V C57
2021-10-14 22:43:56 s 1 +162994.71 7 +222795.62 7900.0 C57
2021-10-14 22:53:56 S 02 56 20.326 +23 19 08.36 V C57
2021-10-14 22:53:56 s 1 +162821.29 0 +223400.66 1550.0 C57
2021-10-14 23:03:56 S 02 56 20.287 +23 19 12.47 V C57
2021-10-14 23:03:56 s 1 +162646.81 6 +224004.26 1700.0 C57
2021-10-14 23:13:56 S 02 56 20.326 +23 19 14.77 V C57
2021-10-14 23:13:56 s 1 +162471.30 1 +224606.44 8370.0 C57
2021-10-14 23:23:56 S 02 56 20.395 +23 19 21.61 V C57
2021-10-14 23:23:56 s 1 +162294.74 9 +225207.18 1570.0 C57
2021-10-14 23:33:56 S 02 56 20.326 +23 19 27.98 V C57
2021-10-14 23:33:56 s 1 +162117.16 6 +225806.49 1320.0 C57
2021-10-14 23:43:56 S 02 56 20.474 +23 19 32.63 V C57
2021-10-14 23:43:56 s 1 +161938.55 7 +226404.37 7640.0 C57
2021-10-15 00:03:56 S 02 56 20.585 +23 19 42.13 V C57
2021-10-15 00:03:56 s 1 +161578.28 1 +227595.85 50.0 C57
2021-10-15 00:13:56 S 02 56 20.635 +23 19 50.84 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)