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
2021-10-14 15:43:56 s 1 +169259.53 4 +196064.62 2630.0 C57
2021-10-14 15:53:56 S 02 53 39.518 +12 21 45.40 V C57
2021-10-14 15:53:56 s 1 +169135.23 0 +196731.53 790.0 C57
2021-10-14 16:03:56 S 02 53 39.386 +12 21 41.26 V C57
2021-10-14 16:03:56 s 1 +169009.62 8 +197396.93 4600.0 C57
2021-10-14 16:13:56 S 02 53 39.451 +12 21 33.01 V C57
2021-10-14 16:13:56 s 1 +168882.73 4 +198060.82 4090.0 C57
2021-10-14 16:23:56 S 02 53 39.223 +12 21 25.45 V C57
2021-10-14 16:23:56 s 1 +168754.55 6 +198723.20 9270.0 C57
2021-10-14 16:33:56 S 02 53 39.072 +12 21 18.32 V C57
2021-10-14 16:33:56 s 1 +168625.10 0 +199384.09 160.0 C57
2021-10-14 16:43:56 S 02 53 38.827 +12 21 11.16 V C57
2021-10-14 16:43:56 s 1 +168494.37 2 +200043.47 6800.0 C57
2021-10-14 16:53:56 S 02 53 38.818 +12 21 03.96 V C57
2021-10-14 16:53:56 s 1 +168362.38 0 +200701.35 9190.0 C57
2021-10-14 17:03:56 S 02 53 38.518 +12 20 58.49 V C57
2021-10-14 17:03:56 s 1 +168229.13 1 +201357.73 7380.0 C57
2021-10-14 17:13:56 S 02 53 38.436 +12 20 50.96 V C57
2021-10-14 17:13:56 s 1 +168094.63 0 +202012.61 1370.0 C57
2021-10-14 17:23:56 S 02 53 38.335 +12 20 45.74 V C57
2021-10-14 17:23:56 s 1 +167958.88 4 +202666.00 1180.0 C57
2021-10-14 17:33:56 S 02 53 38.261 +12 20 34.30 V C57
2021-10-14 17:33:56 s 1 +167821.90 1 +203317.90 6850.0 C57
2021-10-14 17:43:56 S 02 53 38.021 +12 20 30.70 V C57
2021-10-14 17:43:56 s 1 +167683.68 5 +203968.30 8400.0 C57
2021-10-14 17:53:56 S 02 53 37.958 +12 20 22.02 V C57
2021-10-14 17:53:56 s 1 +167544.24 4 +204617.22 5830.0 C57
2021-10-14 18:03:56 S 02 53 37.757 +12 20 13.99 V C57
2021-10-14 18:03:56 s 1 +167403.58 4 +205264.64 9190.0 C57
2021-10-14 18:23:56 S 02 53 37.577 +12 20 01.54 V C57
2021-10-14 18:23:56 s 1 +167118.63 2 +206555.04 3730.0 C57
2021-10-14 18:43:56 S 02 53 37.315 +12 19 48.22 V C57
2021-10-14 18:43:56 s 1 +166828.88 0 +207839.51 2190.0 C57
2021-10-14 18:53:56 S 02 53 37.068 +12 19 41.27 V C57
2021-10-14 18:53:56 s 1 +166682.21 9 +208479.52 5440.0 C57
2021-10-14 19:03:56 S 02 53 36.857 +12 19 31.01 V C57
2021-10-14 19:03:56 s 1 +166534.37 6 +209118.06 4730.0 C57
2021-10-14 19:13:56 S 02 53 36.744 +12 19 24.13 V C57
2021-10-14 19:13:56 s 1 +166385.35 7 +209755.12 90.0 C57
2021-10-14 19:23:56 S 02 53 36.727 +12 19 17.62 V C57
2021-10-14 19:23:56 s 1 +166235.16 9 +210390.70 1520.0 C57
2021-10-14 19:33:56 S 02 53 36.444 +12 19 11.06 V C57
2021-10-14 19:33:56 s 1 +166083.81 7 +211024.82 9060.0 C57
2021-10-14 19:43:56 S 02 53 36.425 +12 19 02.28 V C57
2021-10-14 19:43:56 s 1 +165931.30 7 +211657.46 2730.0 C57
2021-10-14 19:53:56 S 02 53 36.257 +12 18 57.06 V C57
2021-10-14 19:53:56 s 1 +165777.64 6 +212288.64 2540.0 C57
2021-10-14 20:03:56 S 02 53 36.319 +12 18 51.44 V C57
2021-10-14 20:03:56 s 1 +165622.83 8 +212918.35 8510.0 C57
2021-10-14 20:13:56 S 02 53 36.065 +12 18 42.16 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)