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
2021-10-26 23:33:56 S 02 55 00.845 +06 48 31.90 V C57
2021-10-26 23:33:56 s 1 +179056.12 6 +142081.08 4070.0 C57
2021-10-26 23:43:56 S 02 55 00.377 +06 48 15.41 V C57
2021-10-26 23:43:56 s 1 +179060.89 8 +142855.47 3130.0 C57
2021-10-26 23:53:56 S 02 54 59.902 +06 48 00.00 V C57
2021-10-26 23:53:56 s 1 +179063.73 5 +143628.33 5670.0 C57
2021-10-27 00:03:56 S 02 54 59.460 +06 47 43.87 V C57
2021-10-27 00:03:56 s 1 +179064.64 8 +144399.63 1730.0 C57
2021-10-27 00:13:56 S 02 54 58.934 +06 47 26.63 V C57
2021-10-27 00:13:56 s 1 +179063.64 9 +145169.39 1370.0 C57
2021-10-27 00:23:56 S 02 54 58.505 +06 47 10.10 V C57
2021-10-27 00:23:56 s 1 +179060.74 8 +145937.61 4600.0 C57
2021-10-27 00:33:56 S 02 54 57.984 +06 46 54.52 V C57
2021-10-27 00:33:56 s 1 +179055.95 6 +146704.28 1470.0 C57
2021-10-27 00:43:56 S 02 54 57.576 +06 46 37.24 V C57
2021-10-27 00:43:56 s 1 +179049.28 6 +147469.41 2030.0 C57
2021-10-27 00:53:56 S 02 54 57.077 +06 46 21.22 V C57
2021-10-27 00:53:56 s 1 +179040.74 7 +148233.00 6300.0 C57
2021-10-27 01:03:56 S 02 54 56.621 +06 46 04.58 V C57
2021-10-27 01:03:56 s 1 +179030.35 1 +148995.05 4320.0 C57
2021-10-27 01:13:56 S 02 54 56.165 +06 45 47.63 V C57
2021-10-27 01:13:56 s 1 +179018.10 8 +149755.56 6130.0 C57
2021-10-27 01:23:56 S 02 54 55.639 +06 45 31.54 V C57
2021-10-27 01:23:56 s 1 +179004.03 0 +150514.53 1760.0 C57
2021-10-27 01:33:56 S 02 54 55.186 +06 45 14.90 V C57
2021-10-27 01:33:56 s 1 +178988.12 6 +151271.96 1260.0 C57
2021-10-27 01:43:56 S 02 54 54.727 +06 44 58.63 V C57
2021-10-27 01:43:56 s 1 +178970.40 7 +152027.86 4660.0 C57
2021-10-27 01:53:56 S 02 54 54.300 +06 44 41.35 V C57
2021-10-27 01:53:56 s 1 +178950.88 4 +152782.22 1990.0 C57
2021-10-27 02:03:56 S 02 54 53.806 +06 44 25.87 V C57
2021-10-27 02:03:56 s 1 +178929.56 7 +153535.05 3290.0 C57
2021-10-27 02:13:56 S 02 54 53.309 +06 44 08.70 V C57
2021-10-27 02:13:56 s 1 +178906.46 6 +154286.34 8600.0 C57
2021-10-27 02:23:56 S 02 54 52.896 +06 43 52.43 V C57
2021-10-27 02:23:56 s 1 +178881.59 1 +155036.11 7940.0 C57
2021-10-27 02:33:56 S 02 54 52.378 +06 43 35.69 V C57
2021-10-27 02:33:56 s 1 +178854.95 3 +155784.34 1360.0 C57
2021-10-27 02:43:56 S 02 54 51.883 +06 43 20.17 V C57
2021-10-27 02:43:56 s 1 +178826.56 2 +156531.04 8880.0 C57
2021-10-27 02:53:56 S 02 54 51.458 +06 43 02.21 V C57
2021-10-27 02:53:56 s 1 +178796.42 7 +157276.21 550.0 C57
2021-10-27 03:03:56 S 02 54 50.945 +06 42 45.68 V C57
2021-10-27 03:03:56 s 1 +178764.55 9 +158019.85 6390.0 C57
2021-10-27 03:13:56 S 02 54 50.400 +06 42 28.22 V C57
2021-10-27 03:13:56 s 1 +178730.96 7 +158761.97 6440.0 C57
2021-10-27 03:23:56 S 02 54 50.009 +06 42 11.77 V C57
2021-10-27 03:23:56 s 1 +178695.66 1 +159502.56 730.0 C57
2021-10-27 03:33:56 S 02 54 49.495 +06 41 55.72 V C57
2021-10-27 03:33:56 s 1 +178658.65 0 +160241.63 9300.0 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)