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
2021-10-22 08:33:56 s 1 -166541.63 5 +204513.88 140.0 C57
2021-10-22 08:43:56 S 02 52 37.051 +09 05 39.01 V C57
2021-10-22 08:43:56 s 1 -166684.94 2 +203862.81 330.0 C57
2021-10-22 08:53:56 S 02 52 37.178 +09 05 26.38 V C57
2021-10-22 08:53:56 s 1 -166827.03 0 +203210.24 6160.0 C57
2021-10-22 09:03:56 S 02 52 37.488 +09 05 12.88 V C57
2021-10-22 09:03:56 s 1 -166967.89 3 +202556.18 7620.0 C57
2021-10-22 09:13:56 S 02 52 37.726 +09 04 59.45 V C57
2021-10-22 09:13:56 s 1 -167107.52 4 +201900.61 4680.0 C57
2021-10-22 09:23:56 S 02 52 37.961 +09 04 48.00 V C57
2021-10-22 09:23:56 s 1 -167245.91 7 +201243.53 7330.0 C57
2021-10-22 09:33:56 S 02 52 38.064 +09 04 31.98 V C57
2021-10-22 09:33:56 s 1 -167383.06 6 +200584.96 5540.0 C57
2021-10-22 09:43:56 S 02 52 38.186 +09 04 19.42 V C57
2021-10-22 09:43:56 s 1 -167518.96 3 +199924.87 9290.0 C57
2021-10-22 09:53:56 S 02 52 38.347 +09 04 05.41 V C57
2021-10-22 09:53:56 s 1 -167653.60 2 +199263.28 8550.0 C57
2021-10-22 10:03:56 S 02 52 38.549 +09 03 52.34 V C57
2021-10-22 10:03:56 s 1 -167786.97 7 +198600.18 3300.0 C57
2021-10-22 10:13:56 S 02 52 38.755 +09 03 38.41 V C57
2021-10-22 10:13:56 s 1 -167919.08 0 +197935.57 3520.0 C57
2021-10-22 10:23:56 S 02 52 38.966 +09 03 24.77 V C57
2021-10-22 10:23:56 s 1 -168049.90 6 +197269.44 9180.0 C57
2021-10-22 10:33:56 S 02 52 39.230 +09 03 11.92 V C57
2021-10-22 10:33:56 s 1 -168179.44 6 +196601.80 260.0 C57
2021-10-22 10:43:56 S 02 52 39.418 +09 02 58.78 V C57
2021-10-22 10:43:56 s 1 -168307.69 5 +195932.64 6740.0 C57
2021-10-22 10:53:56 S 02 52 39.670 +09 02 45.10 V C57
2021-10-22 10:53:56 s 1 -168434.64 5 +195261.96 8600.0 C57
2021-10-22 11:03:56 S 02 52 39.888 +09 02 30.59 V C57
2021-10-22 11:03:56 s 1 -168560.28 9 +194589.76 5800.0 C57
2021-10-22 11:13:56 S 02 52 40.034 +09 02 17.27 V C57
2021-10-22 11:13:56 s 1 -168684.62 1 +193916.04 8330.0 C57
2021-10-22 11:23:56 S 02 52 40.260 +09 02 04.42 V C57
2021-10-22 11:23:56 s 1 -168807.63 3 +193240.79 6160.0 C57
2021-10-22 11:33:56 S 02 52 40.512 +09 01 49.69 V C57
2021-10-22 11:33:56 s 1 -168929.31 9 +192564.02 9260.0 C57
2021-10-22 11:43:56 S 02 52 40.752 +09 01 37.81 V C57
2021-10-22 11:43:56 s 1 -169049.67 0 +191885.72 7620.0 C57
2021-10-22 11:53:56 S 02 52 40.848 +09 01 23.84 V C57
2021-10-22 11:53:56 s 1 -169168.68 1 +191205.89 1200.0 C57
2021-10-22 12:03:56 S 02 52 41.100 +09 01 10.20 V C57
2021-10-22 12:03:56 s 1 -169286.34 2 +190524.53 9980.0 C57
2021-10-22 12:13:56 S 02 52 41.306 +09 00 57.42 V C57
2021-10-22 12:13:56 s 1 -169402.64 9 +189841.64 3940.0 C57
2021-10-22 12:23:56 S 02 52 41.525 +09 00 43.45 V C57
2021-10-22 12:23:56 s 1 -169517.59 2 +189157.22 3040.0 C57
2021-10-22 12:33:56 S 02 52 41.635 +09 00 30.28 V C57
2021-10-22 12:33:56 s 1 -169631.16 4 +188471.25 7280.0 C57
2021-10-22 12:43:56 S 02 52 41.906 +09 00 16.81 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)