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
2021-10-20 23:13:56 s 1 -119857.85 7 +306821.95 7960.0 C57
2021-10-20 23:23:56 S 02 52 16.217 +09 49 24.46 V C57
2021-10-20 23:23:56 s 1 -120156.49 4 +306439.04 410.0 C57
2021-10-20 23:33:56 S 02 52 16.178 +09 49 07.61 V C57
2021-10-20 23:33:56 s 1 -120454.65 9 +306054.91 1120.0 C57
2021-10-20 23:43:56 S 02 52 16.282 +09 48 57.49 V C57
2021-10-20 23:43:56 s 1 -120752.35 0 +305669.56 70.0 C57
2021-10-20 23:53:56 S 02 52 16.361 +09 48 43.45 V C57
2021-10-20 23:53:56 s 1 -121049.56 5 +305283.01 7260.0 C57
2021-10-21 00:03:56 S 02 52 16.330 +09 48 30.85 V C57
2021-10-21 00:03:56 s 1 -121346.30 1 +304895.24 2680.0 C57
2021-10-21 00:13:56 S 02 52 16.438 +09 48 18.07 V C57
2021-10-21 00:13:56 s 1 -121642.55 7 +304506.25 6320.0 C57
2021-10-21 00:23:56 S 02 52 16.483 +09 48 05.54 V C57
2021-10-21 00:23:56 s 1 -121938.32 9 +304116.05 8180.0 C57
2021-10-21 00:33:56 S 02 52 16.490 +09 47 51.94 V C57
2021-10-21 00:33:56 s 1 -122233.61 7 +303724.63 8240.0 C57
2021-10-21 00:43:56 S 02 52 16.546 +09 47 39.80 V C57
2021-10-21 00:43:56 s 1 -122528.41 7 +303331.99 6500.0 C57
2021-10-21 00:53:56 S 02 52 16.548 +09 47 28.25 V C57
2021-10-21 00:53:56 s 1 -122822.72 7 +302938.13 2950.0 C57
2021-10-21 01:03:56 S 02 52 16.589 +09 47 14.17 V C57
2021-10-21 01:03:56 s 1 -123116.54 6 +302543.05 7590.0 C57
2021-10-21 01:13:56 S 02 52 16.584 +09 47 01.32 V C57
2021-10-21 01:13:56 s 1 -123409.87 0 +302146.75 400.0 C57
2021-10-21 01:23:56 S 02 52 16.646 +09 46 49.62 V C57
2021-10-21 01:23:56 s 1 -123702.69 8 +301749.22 1380.0 C57
2021-10-21 01:33:56 S 02 52 16.733 +09 46 36.01 V C57
2021-10-21 01:33:56 s 1 -123995.02 8 +301350.47 520.0 C57
2021-10-21 01:43:56 S 02 52 16.910 +09 46 23.02 V C57
2021-10-21 01:43:56 s 1 -124286.85 7 +300950.49 7810.0 C57
2021-10-21 01:53:56 S 02 52 16.802 +09 46 10.78 V C57
2021-10-21 01:53:56 s 1 -124578.18 2 +300549.29 3240.0 C57
2021-10-21 02:03:56 S 02 52 16.834 +09 46 00.08 V C57
2021-10-21 02:03:56 s 1 -124869.00 2 +300146.86 6810.0 C57
2021-10-21 02:13:56 S 02 52 16.913 +09 45 45.65 V C57
2021-10-21 02:13:56 s 1 -125159.31 4 +299743.21 8500.0 C57
2021-10-21 02:23:56 S 02 52 16.994 +09 45 32.51 V C57
2021-10-21 02:23:56 s 1 -125449.11 6 +299338.32 8320.0 C57
2021-10-21 02:33:56 S 02 52 16.894 +09 45 20.27 V C57
2021-10-21 02:33:56 s 1 -125738.40 6 +298932.20 6240.0 C57
2021-10-21 02:43:56 S 02 52 17.057 +09 45 07.24 V C57
2021-10-21 02:43:56 s 1 -126027.18 0 +298524.85 2270.0 C57
2021-10-21 02:53:56 S 02 52 17.038 +09 44 53.02 V C57
2021-10-21 02:53:56 s 1 -126315.43 8 +298116.27 6390.0 C57
2021-10-21 03:03:56 S 02 52 17.105 +09 44 40.85 V C57
2021-10-21 03:03:56 s 1 -126603.17 6 +297706.45 8600.0 C57
2021-10-21 03:13:56 S 02 52 17.249 +09 44 29.90 V C57
2021-10-21 03:13:56 s 1 -126890.39 2 +297295.40 8880.0 C57
2021-10-21 03:23:56 S 02 52 17.206 +09 44 15.29 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)