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 10:03:56 S 02 53 24.485 +12 08 14.64 V C57
2021-10-15 10:03:56 s 1 +149053.36 8 +260751.50 8020.0 C57
2021-10-15 10:13:56 S 02 53 24.367 +12 08 10.43 V C57
2021-10-15 10:13:56 s 1 +148819.14 9 +261262.66 8690.0 C57
2021-10-15 10:23:56 S 02 53 24.130 +12 08 03.01 V C57
2021-10-15 10:23:56 s 1 +148584.17 4 +261772.48 6840.0 C57
2021-10-15 10:33:56 S 02 53 24.266 +12 07 53.90 V C57
2021-10-15 10:33:56 s 1 +148348.44 6 +262280.98 2480.0 C57
2021-10-15 10:43:56 S 02 53 24.043 +12 07 46.70 V C57
2021-10-15 10:43:56 s 1 +148111.96 8 +262788.16 5630.0 C57
2021-10-15 10:53:56 S 02 53 23.887 +12 07 38.03 V C57
2021-10-15 10:53:56 s 1 +147874.74 5 +263294.01 6290.0 C57
2021-10-15 11:03:56 S 02 53 23.726 +12 07 29.75 V C57
2021-10-15 11:03:56 s 1 +147636.77 9 +263798.54 4480.0 C57
2021-10-15 11:13:56 S 02 53 23.597 +12 07 22.22 V C57
2021-10-15 11:13:56 s 1 +147398.07 4 +264301.75 210.0 C57
2021-10-15 11:23:56 S 02 53 23.441 +12 07 14.70 V C57
2021-10-15 11:23:56 s 1 +147158.63 3 +264803.64 3490.0 C57
2021-10-15 11:33:56 S 02 53 23.138 +12 07 06.46 V C57
2021-10-15 11:33:56 s 1 +146918.46 0 +265304.21 4330.0 C57
2021-10-15 11:43:56 S 02 53 23.146 +12 06 57.82 V C57
2021-10-15 11:43:56 s 1 +146677.55 8 +265803.47 2750.0 C57
2021-10-15 11:53:56 S 02 53 22.949 +12 06 49.50 V C57
2021-10-15 11:53:56 s 1 +146435.93 1 +266301.41 8750.0 C57
2021-10-15 12:03:56 S 02 53 22.764 +12 06 42.08 V C57
2021-10-15 12:03:56 s 1 +146193.58 1 +266798.04 2350.0 C57
2021-10-15 12:13:56 S 02 53 22.687 +12 06 31.57 V C57
2021-10-15 12:13:56 s 1 +145950.51 3 +267293.36 3560.0 C57
2021-10-15 12:23:56 S 02 53 22.603 +12 06 27.83 V C57
2021-10-15 12:23:56 s 1 +145706.72 8 +267787.37 2380.0 C57
2021-10-15 12:33:56 S 02 53 22.536 +12 06 18.58 V C57
2021-10-15 12:33:56 s 1 +145462.23 2 +268280.07 8830.0 C57
2021-10-15 12:43:56 S 02 53 22.392 +12 06 10.51 V C57
2021-10-15 12:43:56 s 1 +145217.02 6 +268771.46 2930.0 C57
2021-10-15 12:53:56 S 02 53 22.075 +12 06 03.24 V C57
2021-10-15 12:53:56 s 1 +144971.11 4 +269261.54 4680.0 C57
2021-10-15 13:03:56 S 02 53 21.965 +12 05 54.35 V C57
2021-10-15 13:03:56 s 1 +144724.49 9 +269750.32 4090.0 C57
2021-10-15 13:13:56 S 02 53 21.835 +12 05 45.85 V C57
2021-10-15 13:13:56 s 1 +144477.18 5 +270237.80 1170.0 C57
2021-10-15 13:23:56 S 02 53 21.708 +12 05 37.14 V C57
2021-10-15 13:23:56 s 1 +144229.17 5 +270723.97 5940.0 C57
2021-10-15 13:33:56 S 02 53 21.610 +12 05 29.76 V C57
2021-10-15 13:33:56 s 1 +143980.47 2 +271208.84 8400.0 C57
2021-10-15 13:43:56 S 02 53 21.509 +12 05 22.27 V C57
2021-10-15 13:43:56 s 1 +143731.07 8 +271692.42 8570.0 C57
2021-10-15 13:53:56 S 02 53 21.437 +12 05 15.32 V C57
2021-10-15 13:53:56 s 1 +143480.99 8 +272174.69 6460.0 C57
2021-10-15 14:03:56 S 02 53 21.322 +12 05 04.81 V C57
2021-10-15 14:03:56 s 1 +143230.23 4 +272655.67 2070.0 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)