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 11:33:56 s 1 +171922.79 6 +178895.43 5260.0 C57
2021-10-14 11:43:56 S 02 53 42.842 +12 24 38.56 V C57
2021-10-14 11:43:56 s 1 +171833.32 4 +179600.65 260.0 C57
2021-10-14 11:53:56 S 02 53 42.619 +12 24 28.19 V C57
2021-10-14 11:53:56 s 1 +171742.36 6 +180304.31 270.0 C57
2021-10-14 12:03:56 S 02 53 42.257 +12 24 25.27 V C57
2021-10-14 12:03:56 s 1 +171649.92 8 +181006.41 5310.0 C57
2021-10-14 12:13:56 S 02 53 42.530 +12 24 13.57 V C57
2021-10-14 12:13:56 s 1 +171556.02 0 +181706.97 5430.0 C57
2021-10-14 12:23:56 S 02 53 42.317 +12 24 10.98 V C57
2021-10-14 12:23:56 s 1 +171460.65 0 +182405.98 630.0 C57
2021-10-14 12:33:56 S 02 53 42.209 +12 24 03.89 V C57
2021-10-14 12:33:56 s 1 +171363.82 5 +183103.45 960.0 C57
2021-10-14 12:43:56 S 02 53 42.074 +12 23 57.77 V C57
2021-10-14 12:43:56 s 1 +171265.55 4 +183799.37 6440.0 C57
2021-10-14 12:53:56 S 02 53 41.729 +12 23 49.96 V C57
2021-10-14 12:53:56 s 1 +171165.87 3 +184493.76 7040.0 C57
2021-10-14 13:03:56 S 02 53 41.875 +12 23 40.85 V C57
2021-10-14 13:03:56 s 1 +171066.11 8 +185187.40 410.0 C57
2021-10-14 13:13:56 S 02 53 41.621 +12 23 36.13 V C57
2021-10-14 13:13:56 s 1 +170963.47 6 +185878.65 1650.0 C57
2021-10-14 13:23:56 S 02 53 41.590 +12 23 30.34 V C57
2021-10-14 13:23:56 s 1 +170859.50 4 +186568.41 7990.0 C57
2021-10-14 13:33:56 S 02 53 41.402 +12 23 20.04 V C57
2021-10-14 13:33:56 s 1 +170754.12 5 +187256.64 9610.0 C57
2021-10-14 13:43:56 S 02 53 41.112 +12 23 14.86 V C57
2021-10-14 13:43:56 s 1 +170647.34 6 +187943.33 6540.0 C57
2021-10-14 13:53:56 S 02 53 41.251 +12 23 10.21 V C57
2021-10-14 13:53:56 s 1 +170539.17 6 +188628.49 8790.0 C57
2021-10-14 14:03:56 S 02 53 41.002 +12 23 01.75 V C57
2021-10-14 14:03:56 s 1 +170429.62 0 +189312.12 6410.0 C57
2021-10-14 14:13:56 S 02 53 40.874 +12 22 55.96 V C57
2021-10-14 14:13:56 s 1 +170318.68 8 +189994.22 9400.0 C57
2021-10-14 14:23:56 S 02 53 40.666 +12 22 49.22 V C57
2021-10-14 14:23:56 s 1 +170206.38 6 +190674.79 7810.0 C57
2021-10-14 14:33:56 S 02 53 40.529 +12 22 43.50 V C57
2021-10-14 14:33:56 s 1 +170092.72 1 +191353.84 1640.0 C57
2021-10-14 14:43:56 S 02 53 40.430 +12 22 34.07 V C57
2021-10-14 14:43:56 s 1 +169977.70 2 +192031.36 930.0 C57
2021-10-14 14:53:56 S 02 53 40.469 +12 22 26.36 V C57
2021-10-14 14:53:56 s 1 +169861.33 5 +192707.37 5700.0 C57
2021-10-14 15:03:56 S 02 53 40.140 +12 22 22.55 V C57
2021-10-14 15:03:56 s 1 +169743.62 7 +193381.85 5980.0 C57
2021-10-14 15:13:56 S 02 53 40.030 +12 22 13.51 V C57
2021-10-14 15:13:56 s 1 +169624.58 6 +194054.81 1790.0 C57
2021-10-14 15:23:56 S 02 53 39.922 +12 22 08.08 V C57
2021-10-14 15:23:56 s 1 +169504.21 9 +194726.26 3150.0 C57
2021-10-14 15:33:56 S 02 53 39.725 +12 21 59.72 V C57
2021-10-14 15:33:56 s 1 +169382.53 2 +195396.20 90.0 C57
2021-10-14 15:43:56 S 02 53 39.694 +12 21 52.67 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)