IAA RAS IAA Minor Planet Database

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
2021-10-28 05:43:56 S 02 53 31.049 +05 54 36.18 – V C57
2021-10-28 05:43:56 s 1 +156574.31 3 +258309.94 1190.0 – C57
2021-10-28 05:53:56 S 02 53 30.502 +05 54 16.81 – V C57
2021-10-28 05:53:56 s 1 +156353.87 7 +258826.37 7400.0 – C57
2021-10-28 06:03:56 S 02 53 29.974 +05 53 58.34 – V C57
2021-10-28 06:03:56 s 1 +156132.66 6 +259341.52 1050.0 – C57
2021-10-28 06:13:56 S 02 53 29.482 +05 53 37.54 – V C57
2021-10-28 06:13:56 s 1 +155910.68 3 +259855.37 2140.0 – C57
2021-10-28 06:23:56 S 02 53 28.963 +05 53 18.24 – V C57
2021-10-28 06:23:56 s 1 +155687.93 1 +260367.93 690.0 – C57
2021-10-28 06:33:56 S 02 53 28.378 +05 52 59.48 – V C57
2021-10-28 06:33:56 s 1 +155464.41 5 +260879.20 6720.0 – C57
2021-10-28 06:43:56 S 02 53 27.926 +05 52 40.01 – V C57
2021-10-28 06:43:56 s 1 +155240.13 7 +261389.18 220.0 – C57
2021-10-28 06:53:56 S 02 53 27.408 +05 52 20.78 – V C57
2021-10-28 06:53:56 s 1 +155015.10 1 +261897.88 1210.0 – C57
2021-10-28 07:03:56 S 02 53 26.830 +05 52 02.17 – V C57
2021-10-28 07:03:56 s 1 +154789.31 1 +262405.28 9710.0 – C57
2021-10-28 07:13:56 S 02 53 26.371 +05 51 41.29 – V C57
2021-10-28 07:13:56 s 1 +154562.76 9 +262911.41 5730.0 – C57
2021-10-28 07:23:56 S 02 53 25.903 +05 51 21.24 – V C57
2021-10-28 07:23:56 s 1 +154335.47 9 +263416.25 9270.0 – C57
2021-10-28 07:33:56 S 02 53 25.387 +05 51 02.92 – V C57
2021-10-28 07:33:56 s 1 +154107.44 4 +263919.80 350.0 – C57
2021-10-28 07:34:57 C 02 54 28.05 +05 36 08.2 – V G96
2021-10-28 07:34:57 C 02 54 28.03 +05 36 08.1 – V 703
2021-10-28 07:42:33 C 02 54 27.82 +05 35 53.8 – V 703
2021-10-28 07:43:56 S 02 53 24.761 +05 50 42.61 – V C57
2021-10-28 07:43:56 s 1 +153878.66 8 +264422.08 8980.0 – C57
2021-10-28 07:45:42 C 02 54 27.75 +05 35 48.0 – V G96
2021-10-28 07:50:09 C 02 54 27.61 +05 35 39.8 – V 703
2021-10-28 07:53:10 C 02 54 27.54 +05 35 34.0 – V G96
2021-10-28 07:53:56 S 02 53 24.331 +05 50 23.93 – V C57
2021-10-28 07:53:56 s 1 +153649.15 4 +264923.08 5170.0 – C57
2021-10-28 07:57:44 C 02 54 27.39 +05 35 25.3 – V 703
2021-10-28 08:00:37 C 02 54 27.33 +05 35 20.0 – V G96
2021-10-28 08:03:56 S 02 53 23.834 +05 50 03.66 – V C57
2021-10-28 08:03:56 s 1 +153418.90 5 +265422.80 8940.0 – C57
2021-10-28 08:13:56 S 02 53 23.246 +05 49 44.08 – V C57
2021-10-28 08:13:56 s 1 +153187.92 4 +265921.24 280.0 – C57
2021-10-28 08:23:56 S 02 53 22.728 +05 49 25.18 – V C57
2021-10-28 08:23:56 s 1 +152956.21 5 +266418.40 9220.0 – C57
2021-10-28 08:33:56 S 02 53 22.308 +05 49 05.09 – V C57
2021-10-28 08:33:56 s 1 +152723.78 1 +266914.29 5770.0 – C57
2021-10-28 08:43:56 S 02 53 21.746 +05 48 45.76 – V C57
2021-10-28 08:43:56 s 1 +152490.62 5 +267408.91 9930.0 – C57
2021-10-28 08:53:56 S 02 53 21.245 +05 48 25.67 – V C57
2021-10-28 08:53:56 s 1 +152256.75 0 +267902.26 1710.0 – C57
2021-10-28 09:03:56 S 02 53 20.726 +05 48 06.12 – V C57
2021-10-28 09:03:56 s 1 +152022.16 0 +268394.33 1140.0 – 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)