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
2021-10-30 14:13:56 s 1 +53250.982 0 +365722.66 4010.0 C57
2021-10-30 14:23:56 S 03 02 25.546 +26 58 56.03 V C57
2021-10-30 14:23:56 s 1 +52895.843 0 +365852.61 6550.0 C57
2021-10-30 14:33:56 S 03 02 25.447 +26 59 04.20 V C57
2021-10-30 14:33:56 s 1 +52540.563 0 +365981.52 8690.0 C57
2021-10-30 14:43:56 S 03 02 25.442 +26 59 09.24 V C57
2021-10-30 14:43:56 s 1 +52185.145 0 +366109.38 430.0 C57
2021-10-30 14:53:56 S 03 02 25.418 +26 59 14.86 V C57
2021-10-30 14:53:56 s 1 +51829.588 0 +366236.19 1780.0 C57
2021-10-30 15:03:56 S 03 02 25.318 +26 59 20.65 V C57
2021-10-30 15:03:56 s 1 +51473.895 0 +366361.96 2750.0 C57
2021-10-30 15:13:56 S 03 02 25.327 +26 59 26.30 V C57
2021-10-30 15:13:56 s 1 +51118.066 0 +366486.69 3330.0 C57
2021-10-30 15:23:56 S 03 02 25.234 +26 59 31.99 V C57
2021-10-30 15:23:56 s 1 +50762.103 0 +366610.37 3530.0 C57
2021-10-30 15:33:56 S 03 02 25.231 +26 59 37.75 V C57
2021-10-30 15:33:56 s 1 +50406.006 0 +366733.01 3360.0 C57
2021-10-30 15:43:56 S 03 02 25.138 +26 59 44.16 V C57
2021-10-30 15:43:56 s 1 +50049.777 0 +366854.60 2820.0 C57
2021-10-30 15:53:56 S 03 02 25.138 +26 59 49.16 V C57
2021-10-30 15:53:56 s 1 +49693.416 0 +366975.15 1910.0 C57
2021-10-30 16:03:56 S 03 02 25.034 +26 59 55.39 V C57
2021-10-30 16:03:56 s 1 +49336.926 0 +367094.65 630.0 C57
2021-10-30 16:13:56 S 03 02 24.960 +27 00 01.91 V C57
2021-10-30 16:13:56 s 1 +48980.307 0 +367213.11 9000.0 C57
2021-10-30 16:23:56 S 03 02 24.888 +27 00 07.42 V C57
2021-10-30 16:23:56 s 1 +48623.559 0 +367330.53 7010.0 C57
2021-10-30 16:33:56 S 03 02 24.931 +27 00 12.46 V C57
2021-10-30 16:33:56 s 1 +48266.685 0 +367446.90 4660.0 C57
2021-10-30 16:43:56 S 03 02 24.869 +27 00 17.42 V C57
2021-10-30 16:43:56 s 1 +47909.685 0 +367562.23 1970.0 C57
2021-10-30 16:53:56 S 03 02 24.830 +27 00 25.09 V C57
2021-10-30 16:53:56 s 1 +47552.560 0 +367676.52 8930.0 C57
2021-10-30 17:03:56 S 03 02 24.734 +27 00 30.24 V C57
2021-10-30 17:03:56 s 1 +47195.312 0 +367789.76 5550.0 C57
2021-10-30 17:07:26 C 03 04 30.13 +26 42 20.6 V C40
2021-10-30 17:13:56 S 03 02 24.686 +27 00 35.96 V C57
2021-10-30 17:13:56 s 1 +46837.941 0 +367901.97 1840.0 C57
2021-10-30 17:23:56 S 03 02 24.566 +27 00 41.33 V C57
2021-10-30 17:23:56 s 1 +46480.449 0 +368013.13 7790.0 C57
2021-10-30 17:31:00 C 03 04 30.42 +26 42 38.0 V C40
2021-10-30 17:32:47 C 03 04 30.46 +26 42 31.0 Y 557
2021-10-30 17:33:56 S 03 02 24.569 +27 00 47.99 V C57
2021-10-30 17:33:56 s 1 +46122.837 0 +368123.25 3410.0 C57
2021-10-30 17:37:18 C 03 04 30.49 +26 42 42.8 V C40
2021-10-30 17:43:56 S 03 02 24.540 +27 00 52.09 V C57
2021-10-30 17:43:56 s 1 +45765.106 0 +368232.32 8700.0 C57
2021-10-30 17:53:56 S 03 02 24.475 +27 00 58.75 V C57
2021-10-30 17:53:56 s 1 +45407.256 0 +368340.36 3670.0 C57
2021-10-30 17:57:57 C 03 04 30.71 +26 42 58.3 V C40
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)