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
2021-10-28 06:33:56 s 1 +155464.42 2 +260879.18 6740.0 C57
2021-10-28 06:43:56 S 03 02 52.625 +26 23 57.73 V C57
2021-10-28 06:43:56 s 1 +155240.14 5 +261389.16 250.0 C57
2021-10-28 06:53:56 S 03 02 52.498 +26 24 04.79 V C57
2021-10-28 06:53:56 s 1 +155015.10 9 +261897.86 1240.0 C57
2021-10-28 07:03:56 S 03 02 52.406 +26 24 11.59 V C57
2021-10-28 07:03:56 s 1 +154789.31 8 +262405.27 9740.0 C57
2021-10-28 07:13:56 S 03 02 52.267 +26 24 18.79 V C57
2021-10-28 07:13:56 s 1 +154562.77 6 +262911.39 5760.0 C57
2021-10-28 07:23:56 S 03 02 52.193 +26 24 25.99 V C57
2021-10-28 07:23:56 s 1 +154335.48 6 +263416.23 9300.0 C57
2021-10-28 07:33:56 S 03 02 52.073 +26 24 32.08 V C57
2021-10-28 07:33:56 s 1 +154107.45 2 +263919.79 380.0 C57
2021-10-28 07:43:56 S 03 02 52.018 +26 24 38.70 V C57
2021-10-28 07:43:56 s 1 +153878.67 6 +264422.06 9010.0 C57
2021-10-28 07:53:56 S 03 02 51.905 +26 24 46.44 V C57
2021-10-28 07:53:56 s 1 +153649.16 1 +264923.06 5200.0 C57
2021-10-28 08:03:56 S 03 02 51.821 +26 24 52.63 V C57
2021-10-28 08:03:56 s 1 +153418.91 2 +265422.78 8960.0 C57
2021-10-28 08:13:56 S 03 02 51.689 +26 24 59.62 V C57
2021-10-28 08:13:56 s 1 +153187.93 2 +265921.22 310.0 C57
2021-10-28 08:23:56 S 03 02 51.631 +26 25 06.42 V C57
2021-10-28 08:23:56 s 1 +152956.22 3 +266418.39 9250.0 C57
2021-10-28 08:33:56 S 03 02 51.552 +26 25 12.79 V C57
2021-10-28 08:33:56 s 1 +152723.78 9 +266914.28 5800.0 C57
2021-10-28 08:43:56 S 03 02 51.439 +26 25 19.85 V C57
2021-10-28 08:43:56 s 1 +152490.63 3 +267408.90 9960.0 C57
2021-10-28 08:45:01 C 03 03 32.750 +26 05 06.12 U F52
2021-10-28 08:53:56 S 03 02 51.362 +26 25 26.94 V C57
2021-10-28 08:53:56 s 1 +152256.75 8 +267902.24 1740.0 C57
2021-10-28 09:02:37 C 03 03 32.856 +26 05 18.23 U F52
2021-10-28 09:03:56 S 03 02 51.204 +26 25 33.42 V C57
2021-10-28 09:03:56 s 1 +152022.16 8 +268394.32 1170.0 C57
2021-10-28 09:13:56 S 03 02 51.127 +26 25 40.80 V C57
2021-10-28 09:13:56 s 1 +151786.86 5 +268885.12 8240.0 C57
2021-10-28 09:20:13 C 03 03 32.947 +26 05 30.31 U F52
2021-10-28 09:23:56 S 03 02 51.139 +26 25 47.68 V C57
2021-10-28 09:23:56 s 1 +151550.85 3 +269374.66 2970.0 C57
2021-10-28 09:33:56 S 03 02 50.938 +26 25 53.69 V C57
2021-10-28 09:33:56 s 1 +151314.13 5 +269862.93 5370.0 C57
2021-10-28 09:43:56 S 03 02 50.813 +26 26 01.64 V C57
2021-10-28 09:43:56 s 1 +151076.71 4 +270349.93 5450.0 C57
2021-10-28 09:53:56 S 03 02 50.791 +26 26 07.87 V C57
2021-10-28 09:53:56 s 1 +150838.59 3 +270835.67 3220.0 C57
2021-10-28 10:03:56 S 03 02 50.671 +26 26 13.96 V C57
2021-10-28 10:03:56 s 1 +150599.77 5 +271320.14 8690.0 C57
2021-10-28 10:23:56 S 03 02 50.424 +26 26 28.75 V C57
2021-10-28 10:23:56 s 1 +150120.06 1 +272285.31 2780.0 C57
2021-10-28 10:33:56 S 03 02 50.470 +26 26 34.26 V C57
2021-10-28 10:33:56 s 1 +149879.17 1 +272766.00 1410.0 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)