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
2021-10-15 05:43:56 s 1 +154865.71 4 +246990.74 6260.0 C57
2021-10-15 05:53:56 S 02 53 28.104 +12 11 32.60 V C57
2021-10-15 05:53:56 s 1 +154652.44 8 +247536.93 6790.0 C57
2021-10-15 06:03:56 S 02 53 27.888 +12 11 25.19 V C57
2021-10-15 06:03:56 s 1 +154438.32 7 +248081.75 4460.0 C57
2021-10-15 06:13:56 S 02 53 27.720 +12 11 16.51 V C57
2021-10-15 06:13:56 s 1 +154223.35 6 +248625.21 9300.0 C57
2021-10-15 06:23:56 S 02 53 27.696 +12 11 06.79 V C57
2021-10-15 06:23:56 s 1 +154007.54 0 +249167.30 1310.0 C57
2021-10-15 06:33:56 S 02 53 27.506 +12 11 00.92 V C57
2021-10-15 06:33:56 s 1 +153790.88 1 +249708.04 520.0 C57
2021-10-15 06:43:56 S 02 53 27.300 +12 10 54.05 V C57
2021-10-15 06:43:56 s 1 +153573.38 4 +250247.41 6930.0 C57
2021-10-15 06:53:56 S 02 53 27.266 +12 10 43.03 V C57
2021-10-15 06:53:56 s 1 +153355.05 4 +250785.42 560.0 C57
2021-10-15 07:03:56 S 02 53 27.062 +12 10 37.45 V C57
2021-10-15 07:03:56 s 1 +153135.89 3 +251322.08 1420.0 C57
2021-10-15 07:13:56 S 02 53 27.014 +12 10 29.35 V C57
2021-10-15 07:13:56 s 1 +152915.90 6 +251857.38 9520.0 C57
2021-10-15 07:23:56 S 02 53 26.933 +12 10 23.12 V C57
2021-10-15 07:23:56 s 1 +152695.09 6 +252391.32 4880.0 C57
2021-10-15 07:33:56 S 02 53 26.659 +12 10 14.95 V C57
2021-10-15 07:33:56 s 1 +152473.46 8 +252923.91 7510.0 C57
2021-10-15 07:40:09 C 02 54 04.00 +11 57 32.9 V V21
2021-10-15 07:43:56 S 02 53 26.671 +12 10 07.18 V C57
2021-10-15 07:43:56 s 1 +152251.02 5 +253455.15 7420.0 C57
2021-10-15 07:53:56 S 02 53 26.354 +12 09 58.61 V C57
2021-10-15 07:53:56 s 1 +152027.77 1 +253985.05 4630.0 C57
2021-10-15 08:02:11 C 02 54 04.03 +11 57 16.4 V V21
2021-10-15 08:13:56 S 02 53 26.244 +12 09 42.84 V C57
2021-10-15 08:13:56 s 1 +151578.84 5 +255040.79 990.0 C57
2021-10-15 08:23:56 S 02 53 25.855 +12 09 33.34 V C57
2021-10-15 08:23:56 s 1 +151353.18 1 +255566.64 160.0 C57
2021-10-15 08:30:02 C 02 54 04.06 +11 56 55.4 V V21
2021-10-15 08:33:56 S 02 53 25.656 +12 09 25.99 V C57
2021-10-15 08:33:56 s 1 +151126.72 1 +256091.15 6690.0 C57
2021-10-15 08:43:56 S 02 53 25.831 +12 09 20.41 V C57
2021-10-15 08:43:56 s 1 +150899.46 9 +256614.31 570.0 C57
2021-10-15 09:03:56 S 02 53 25.421 +12 09 06.23 V C57
2021-10-15 09:03:56 s 1 +150442.60 2 +257656.63 450.0 C57
2021-10-15 09:13:56 S 02 53 25.162 +12 08 56.87 V C57
2021-10-15 09:13:56 s 1 +150212.99 6 +258175.77 6490.0 C57
2021-10-15 09:23:56 S 02 53 25.212 +12 08 49.74 V C57
2021-10-15 09:23:56 s 1 +149982.61 1 +258693.59 9930.0 C57
2021-10-15 09:33:56 S 02 53 24.838 +12 08 42.47 V C57
2021-10-15 09:33:56 s 1 +149751.45 2 +259210.06 790.0 C57
2021-10-15 09:43:56 S 02 53 24.857 +12 08 33.22 V C57
2021-10-15 09:43:56 s 1 +149519.52 3 +259725.21 9090.0 C57
2021-10-15 09:53:56 S 02 53 24.694 +12 08 24.36 V C57
2021-10-15 09:53:56 s 1 +149286.82 7 +260239.02 4830.0 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)