3361 Orpheus (1982 HR)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3231610634 ± 2.00e+00
Semi-major axis (a)1.2101508924 AU ± 3.00e+00
Inclination (i)2.65169834° ± 4.00e+00
Long. of Asc. Node (Ω)188.44299382° ± 5.00e+00
Arg. of Perihelion (ω)302.64499143° ± 6.00e+00
Mean Anomaly (M)320.54810304° ± 1.29e-06
Mean Motion (n)0.7403771180°/day ± 2.75e+00
Perihelion dist (q)0.81907724 AU ± 3.16e+00
Aphelion dist (Q)1.60122454 AU ± 4.65e+00
Orbital Period1.33124898 yr ± 4.95e+00
NGA Modelr2
A22.56523269e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.50
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.382″
Uncertainty0
Orbit TypeApollo
MOID0.014472 AU
Observations Used3021
Oppositions11
Arc Total1982-2025
First Observation Used1982-04-24
Last Observation Used2025-11-19
Observations (4857)
Date Type RA Dec Mag Band Observatory
2021-10-19 12:53:56 s 1 -50949.182 0 +361106.56 9540.0 C57
2021-10-19 13:03:56 S 02 52 19.018 +10 31 05.45 V C57
2021-10-19 13:03:56 s 1 -51308.419 0 +360956.60 3060.0 C57
2021-10-19 13:13:56 S 02 52 18.864 +10 30 53.96 V C57
2021-10-19 13:13:56 s 1 -51667.504 0 +360805.57 5970.0 C57
2021-10-19 13:23:56 S 02 52 18.953 +10 30 41.11 V C57
2021-10-19 13:23:56 s 1 -52026.438 0 +360653.47 8260.0 C57
2021-10-19 13:33:56 S 02 52 18.763 +10 30 30.28 V C57
2021-10-19 13:33:56 s 1 -52385.218 0 +360500.29 9930.0 C57
2021-10-19 13:43:56 S 02 52 18.725 +10 30 19.30 V C57
2021-10-19 13:43:56 s 1 -52743.844 0 +360346.04 960.0 C57
2021-10-19 13:53:56 S 02 52 18.638 +10 30 08.32 V C57
2021-10-19 13:53:56 s 1 -53102.315 0 +360190.71 1370.0 C57
2021-10-19 14:03:56 S 02 52 18.660 +10 29 54.06 V C57
2021-10-19 14:03:56 s 1 -53460.628 0 +360034.31 1130.0 C57
2021-10-19 14:13:56 S 02 52 18.586 +10 29 43.04 V C57
2021-10-19 14:13:56 s 1 -53818.783 0 +359876.83 260.0 C57
2021-10-19 14:23:56 S 02 52 18.528 +10 29 32.21 V C57
2021-10-19 14:23:56 s 1 -54176.780 0 +359718.27 8730.0 C57
2021-10-19 14:33:56 S 02 52 18.430 +10 29 21.05 V C57
2021-10-19 14:33:56 s 1 -54534.616 0 +359558.64 6560.0 C57
2021-10-19 14:43:56 S 02 52 18.497 +10 29 08.81 V C57
2021-10-19 14:43:56 s 1 -54892.290 0 +359397.94 3740.0 C57
2021-10-19 14:53:56 S 02 52 18.485 +10 28 57.79 V C57
2021-10-19 14:53:56 s 1 -55249.801 0 +359236.15 250.0 C57
2021-10-19 15:03:56 S 02 52 18.247 +10 28 45.88 V C57
2021-10-19 15:03:56 s 1 -55607.149 0 +359073.29 6110.0 C57
2021-10-19 15:13:56 S 02 52 18.247 +10 28 34.50 V C57
2021-10-19 15:13:56 s 1 -55964.331 0 +358909.35 1300.0 C57
2021-10-19 15:23:56 S 02 52 18.226 +10 28 21.68 V C57
2021-10-19 15:23:56 s 1 -56321.347 0 +358744.34 5810.0 C57
2021-10-19 15:33:56 S 02 52 18.326 +10 28 09.66 V C57
2021-10-19 15:33:56 s 1 -56678.195 0 +358578.24 9650.0 C57
2021-10-19 15:43:56 S 02 52 18.187 +10 27 58.50 V C57
2021-10-19 15:43:56 s 1 -57034.875 0 +358411.07 2810.0 C57
2021-10-19 15:53:56 S 02 52 18.137 +10 27 46.33 V C57
2021-10-19 15:53:56 s 1 -57391.384 0 +358242.81 5290.0 C57
2021-10-19 16:03:56 S 02 52 17.947 +10 27 36.58 V C57
2021-10-19 16:03:56 s 1 -57747.722 0 +358073.48 7080.0 C57
2021-10-19 16:13:56 S 02 52 18.043 +10 27 23.15 V C57
2021-10-19 16:13:56 s 1 -58103.888 0 +357903.07 8180.0 C57
2021-10-19 16:23:56 S 02 52 17.902 +10 27 12.56 V C57
2021-10-19 16:23:56 s 1 -58459.880 0 +357731.57 8580.0 C57
2021-10-19 16:33:56 S 02 52 17.906 +10 26 58.99 V C57
2021-10-19 16:33:56 s 1 -58815.697 0 +357558.99 8270.0 C57
2021-10-19 16:43:56 S 02 52 18.012 +10 26 47.62 V C57
2021-10-19 16:43:56 s 1 -59171.338 0 +357385.34 7270.0 C57
2021-10-19 16:53:56 S 02 52 17.767 +10 26 38.18 V C57
2021-10-19 16:53:56 s 1 -59526.802 0 +357210.60 5550.0 C57
2021-10-19 17:03:56 S 02 52 17.796 +10 26 24.79 V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2021-11-13 07:00:00 55352696.248 1 us 8560 -14 -14
2021-11-14 05:40:00 52231075.023 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)