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
2001-09-25 06:30:45 C 00 20 30.04 +03 29 27.0 18.1 c 704
2001-09-25 06:39:38 C 00 20 29.32 +03 29 19.0 c 683
2001-09-25 06:50:10 C 00 20 28.22 +03 29 11.5 18.0 c 704
2001-09-25 06:52:26 C 00 20 28.02 +03 29 09.4 18.3 c 704
2001-09-25 06:58:58 C 00 20 27.49 +03 29 05.6 c 683
2001-09-25 07:01:32 C 00 20 27.23 +03 29 01.6 c 699
2001-09-25 07:11:46 C 00 20 26.22 +03 28 54.0 18.0 c 704
2001-09-25 07:17:26 C 00 20 25.67 +03 28 49.3 18.4 c 704
2001-09-25 07:33:21 C 00 20 24.21 +03 28 36.6 18.2 c 704
2001-09-25 07:41:33 C 00 20 23.44 +03 28 29.6 18.4 c 704
2001-09-26 05:58:01 C 00 18 25.84 +03 10 13.5 18.7 i 704
2001-09-26 06:19:55 C 00 18 23.80 +03 09 55.6 18.4 i 704
2001-09-26 06:41:51 C 00 18 21.69 +03 09 37.4 19.2 i 704
2001-09-26 06:55:18 C 00 18 20.67 +03 09 25.8 c 670
2001-09-26 07:03:44 C 00 18 19.58 +03 09 19.4 18.4 i 704
2001-09-26 07:25:37 C 00 18 17.49 +03 09 01.3 18.5 i 704
2001-09-26 09:19:56 C 00 18 06.88 +03 07 25.3 c 670
2001-09-26 21:37:03 C 00 17 01.64 +02 57 03.2 938
2001-09-26 22:46:39 C 00 16 54.97 +02 56 04.5 938
2001-09-27 05:56:07 C 00 16 15.59 +02 50 01.7 18.5 i 704
2001-09-27 06:17:28 C 00 16 13.52 +02 49 43.5 18.6 i 704
2001-09-27 06:38:51 C 00 16 11.42 +02 49 25.5 19.0 i 704
2001-09-27 07:00:14 C 00 16 09.36 +02 49 07.0 18.5 i 704
2001-09-27 07:21:40 C 00 16 07.26 +02 48 48.3 18.6 i 704
2001-09-28 05:53:13 C 00 14 02.42 +02 29 19.5 17.7 c 704
2001-09-28 06:15:22 C 00 14 00.18 +02 28 59.9 17.8 c 704
2001-09-28 06:37:01 C 00 13 58.04 +02 28 40.9 18.2 c 704
2001-09-28 06:58:49 C 00 13 55.87 +02 28 21.6 18.2 c 704
2001-09-28 07:20:28 C 00 13 53.67 +02 28 02.5 18.1 c 704
2001-10-05 07:22:50 C 23 57 11.39 -00 09 46.7 18.1 c 644
2001-10-05 07:53:49 C 23 57 07.97 -00 10 17.3 18.0 c 644
2001-10-05 08:26:00 C 23 57 04.44 -00 10 49.1 18.7 c 644
2001-10-06 04:30:40 C 23 55 00.49 -00 30 45.2 17.9 c 704
2001-10-06 04:52:55 C 23 54 58.00 -00 31 08.3 18.1 c 704
2001-10-06 05:15:15 C 23 54 55.50 -00 31 30.5 18.3 c 704
2001-10-06 05:37:33 C 23 54 53.05 -00 31 52.9 18.4 c 704
2001-10-06 20:48:31 C 23 53 18.05 -00 47 09.9 c 118
2001-10-06 20:55:19 C 23 53 17.30 -00 47 16.7 c 118
2001-10-06 21:10:22 C 23 53 15.63 -00 47 31.8 c 118
2001-10-11 05:46:35 C 23 42 17.00 -02 33 30.8 t 644
2001-10-11 06:17:07 C 23 42 13.58 -02 34 01.7 t 644
2001-10-13 04:07:06 C 23 37 28.13 -03 20 34.1 18.3 c 704
2001-10-13 04:30:19 C 23 37 25.60 -03 20 57.4 18.5 c 704
2001-10-13 04:54:23 C 23 37 22.93 -03 21 21.6 18.7 c 704
2001-10-13 05:17:15 C 23 37 20.40 -03 21 44.3 18.8 c 704
2001-10-13 05:40:06 C 23 37 17.86 -03 22 07.6 18.6 c 704
2001-10-13 20:30:45 C 23 35 46.52 -03 37 13.9 c 113
2001-10-13 20:33:26 C 23 35 46.19 -03 37 15.8 c 113
2001-10-13 20:36:09 C 23 35 46.01 -03 37 18.0 c 113
2001-10-13 20:38:51 C 23 35 45.76 -03 37 20.9 c 113
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)