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 12:43:56 s 1 -169743.35 9 +187783.75 6610.0 C57
2021-10-22 12:53:56 S 02 52 42.149 +09 00 03.13 V C57
2021-10-22 12:53:56 s 1 -169854.16 8 +187094.71 1010.0 C57
2021-10-22 13:03:56 S 02 52 42.360 +08 59 49.60 V C57
2021-10-22 13:03:56 s 1 -169963.58 4 +186404.13 450.0 C57
2021-10-22 13:13:56 S 02 52 42.602 +08 59 35.74 V C57
2021-10-22 13:13:56 s 1 -170071.59 9 +185712.00 4920.0 C57
2021-10-22 13:23:56 S 02 52 42.763 +08 59 22.13 V C57
2021-10-22 13:23:56 s 1 -170178.20 6 +185018.33 4380.0 C57
2021-10-22 13:33:56 S 02 52 43.090 +08 59 08.88 V C57
2021-10-22 13:33:56 s 1 -170283.39 7 +184323.12 8810.0 C57
2021-10-22 13:43:56 S 02 52 43.289 +08 58 54.98 V C57
2021-10-22 13:43:56 s 1 -170387.16 4 +183626.35 8180.0 C57
2021-10-22 13:53:56 S 02 52 43.562 +08 58 41.66 V C57
2021-10-22 13:53:56 s 1 -170489.49 9 +182928.04 2450.0 C57
2021-10-22 14:03:56 S 02 52 43.680 +08 58 28.38 V C57
2021-10-22 14:03:56 s 1 -170590.39 4 +182228.17 1620.0 C57
2021-10-22 14:13:56 S 02 52 43.903 +08 58 15.82 V C57
2021-10-22 14:13:56 s 1 -170689.84 1 +181526.75 5630.0 C57
2021-10-22 14:23:56 S 02 52 44.256 +08 58 00.62 V C57
2021-10-22 14:23:56 s 1 -170787.83 3 +180823.78 4480.0 C57
2021-10-22 14:33:56 S 02 52 44.434 +08 57 47.48 V C57
2021-10-22 14:33:56 s 1 -170884.36 1 +180119.24 8130.0 C57
2021-10-22 14:43:56 S 02 52 44.729 +08 57 34.20 V C57
2021-10-22 14:43:56 s 1 -170979.41 7 +179413.15 6550.0 C57
2021-10-22 14:53:56 S 02 52 44.887 +08 57 20.81 V C57
2021-10-22 14:53:56 s 1 -171072.99 2 +178705.50 9720.0 C57
2021-10-22 15:03:56 S 02 52 45.113 +08 57 07.02 V C57
2021-10-22 15:03:56 s 1 -171165.07 9 +177996.29 7600.0 C57
2021-10-22 15:13:56 S 02 52 45.372 +08 56 53.88 V C57
2021-10-22 15:13:56 s 1 -171255.66 9 +177285.51 170.0 C57
2021-10-22 15:23:56 S 02 52 45.586 +08 56 41.24 V C57
2021-10-22 15:23:56 s 1 -171344.75 4 +176573.17 7400.0 C57
2021-10-22 15:33:56 S 02 52 45.830 +08 56 26.74 V C57
2021-10-22 15:33:56 s 1 -171432.32 6 +175859.26 9260.0 C57
2021-10-22 15:43:56 S 02 52 45.986 +08 56 13.16 V C57
2021-10-22 15:43:56 s 1 -171518.37 4 +175143.79 5710.0 C57
2021-10-22 15:53:56 S 02 52 46.301 +08 55 59.59 V C57
2021-10-22 15:53:56 s 1 -171602.89 3 +174426.74 6740.0 C57
2021-10-22 16:03:56 S 02 52 46.625 +08 55 46.74 V C57
2021-10-22 16:03:56 s 1 -171685.87 1 +173708.12 2300.0 C57
2021-10-22 16:13:56 S 02 52 46.824 +08 55 31.91 V C57
2021-10-22 16:13:56 s 1 -171767.30 1 +172987.93 2370.0 C57
2021-10-22 16:23:56 S 02 52 46.982 +08 55 19.42 V C57
2021-10-22 16:23:56 s 1 -171847.17 5 +172266.16 6920.0 C57
2021-10-22 16:33:56 S 02 52 47.266 +08 55 05.23 V C57
2021-10-22 16:33:56 s 1 -171925.48 2 +171542.82 5920.0 C57
2021-10-22 16:43:56 S 02 52 47.532 +08 54 53.24 V C57
2021-10-22 16:43:56 s 1 -172002.21 4 +170817.90 9340.0 C57
2021-10-22 16:53:56 S 02 52 47.837 +08 54 37.73 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)