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
2001-09-11 07:29:48 C 00 43 21.98 +06 58 51.9 – c 699
2001-09-11 08:03:36 C 00 43 20.12 +06 58 36.9 – c 699
2001-09-11 08:37:32 C 00 43 18.32 +06 58 22.8 – c 699
2001-09-16 09:06:17 C 00 36 37.16 +05 57 24.9 19.3 c 704
2001-09-16 09:26:56 C 00 36 35.76 +05 57 13.1 19.7 c 704
2001-09-16 09:47:36 C 00 36 34.34 +05 57 01.1 19.5 c 704
2001-09-17 06:18:31 C 00 35 16.36 +05 45 00.2 18.9 c 644
2001-09-17 06:50:43 C 00 35 14.11 +05 44 41.3 18.5 c 644
2001-09-17 07:21:19 C 00 35 11.91 +05 44 23.0 18.4 c 644
2001-09-18 06:42:31 C 00 33 37.91 +05 30 04.4 – c 699
2001-09-18 07:16:14 C 00 33 35.35 +05 29 42.5 – c 699
2001-09-18 07:50:00 C 00 33 32.91 +05 29 21.2 – c 699
2001-09-18 08:23:53 C 00 33 30.36 +05 29 00.1 – c 699
2001-09-19 07:51:48 C 00 31 51.56 +05 13 59.3 18.4 c 704
2001-09-19 07:51:59 C 00 31 51.58 +05 13 57.4 18.3 c 704
2001-09-19 07:52:18 C 00 31 51.55 +05 13 58.9 18.4 c 704
2001-09-19 07:52:28 C 00 31 51.56 +05 13 57.7 18.9 c 704
2001-09-19 08:12:13 C 00 31 49.95 +05 13 46.2 18.8 c 704
2001-09-19 08:12:27 C 00 31 50.00 +05 13 44.0 18.9 c 704
2001-09-19 08:12:46 C 00 31 49.94 +05 13 45.5 18.9 c 704
2001-09-19 08:12:56 C 00 31 49.96 +05 13 44.0 18.8 c 704
2001-09-19 08:32:58 C 00 31 48.34 +05 13 32.3 19.0 c 704
2001-09-19 08:33:08 C 00 31 48.36 +05 13 30.9 19.0 c 704
2001-09-19 08:33:28 C 00 31 48.36 +05 13 31.5 19.3 c 704
2001-09-19 08:33:38 C 00 31 48.30 +05 13 30.4 18.9 c 704
2001-09-19 08:53:15 C 00 31 46.78 +05 13 18.8 18.7 c 704
2001-09-19 08:53:26 C 00 31 46.82 +05 13 17.4 19.0 c 704
2001-09-19 08:53:46 C 00 31 46.80 +05 13 18.5 19.0 c 704
2001-09-19 08:53:56 C 00 31 46.77 +05 13 17.0 19.2 c 704
2001-09-19 09:13:40 C 00 31 45.22 +05 13 05.7 18.9 c 704
2001-09-19 09:13:53 C 00 31 45.25 +05 13 04.0 18.9 c 704
2001-09-19 09:14:13 C 00 31 45.26 +05 13 04.6 19.0 c 704
2001-09-19 09:14:23 C 00 31 45.23 +05 13 03.7 19.0 c 704
2001-09-20 06:15:27 C 00 30 14.08 +04 59 01.4 17.2 c 704
2001-09-20 06:35:51 C 00 30 12.49 +04 58 47.2 18.9 c 704
2001-09-20 06:56:13 C 00 30 10.83 +04 58 33.8 18.4 c 704
2001-09-20 07:16:34 C 00 30 09.19 +04 58 20.1 18.9 c 704
2001-09-20 07:36:57 C 00 30 07.57 +04 58 05.5 18.6 c 704
2001-09-24 08:02:15 C 00 22 25.64 +03 47 20.8 18.2 i 704
2001-09-24 08:23:17 C 00 22 23.72 +03 47 04.5 18.8 i 704
2001-09-24 08:44:19 C 00 22 21.81 +03 46 48.0 18.5 i 704
2001-09-24 09:05:23 C 00 22 19.88 +03 46 31.6 18.6 i 704
2001-09-24 09:26:27 C 00 22 17.99 +03 46 15.3 18.7 i 704
2001-09-25 05:27:09 C 00 20 36.05 +03 30 18.1 – c 699
2001-09-25 05:58:35 C 00 20 33.10 +03 29 53.1 – c 699
2001-09-25 06:06:57 C 00 20 32.29 +03 29 46.1 18.6 c 704
2001-09-25 06:08:18 C 00 20 32.12 +03 29 45.2 17.8 c 704
2001-09-25 06:23:32 C 00 20 30.69 +03 29 32.8 – c 683
2001-09-25 06:28:31 C 00 20 30.24 +03 29 28.7 18.0 c 704
2001-09-25 06:30:04 C 00 20 30.18 +03 29 27.4 – c 699
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)