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
2013-10-25 04:35:57 C 01 07 17.44 +00 28 58.3 q H45
2013-10-25 04:37:07 C 01 07 17.28 +00 28 56.4 q H45
2013-10-25 04:39:36 C 01 07 16.96 +00 28 52.3 q H45
2013-10-25 05:21:38 C 01 07 12.42 +00 27 43.7 N I41
2013-10-25 08:25:14 C 01 06 47.64 +00 22 39.2 N I41
2013-10-25 09:02:17 C 01 06 42.68 +00 21 37.6 N I41
2013-10-27 07:57:11 C 01 00 47.444 -00 58 36.07 L F51
2013-10-27 08:13:47 C 01 00 45.035 -00 59 05.47 L F51
2013-10-27 08:19:28 C 01 00 44.214 -00 59 15.40 L F51
2013-10-27 08:36:11 C 01 00 41.793 -00 59 44.86 L F51
2013-10-27 08:58:41 C 01 00 38.504 -01 00 24.61 L F51
2013-10-27 09:04:23 C 01 00 37.685 -01 00 34.66 L F51
2013-10-29 03:11:24 C 00 54 59.18 -02 16 59.3 u H21
2013-10-29 03:16:14 C 00 54 58.46 -02 17 08.2 u H21
2013-10-29 03:19:44 C 00 54 57.93 -02 17 14.8 u H21
2013-10-29 03:23:41 C 00 54 57.34 -02 17 22.0 u H21
2013-10-29 03:27:39 C 00 54 56.75 -02 17 29.3 u H21
2013-10-29 18:26:32 C 00 52 52.81 -02 45 31.4 q L22
2013-10-29 18:29:40 C 00 52 52.28 -02 45 37.0 q L22
2013-10-29 18:32:49 C 00 52 51.85 -02 45 42.6 q L22
2013-10-29 18:35:58 C 00 52 51.43 -02 45 49.5 q L22
2013-10-29 18:39:06 C 00 52 50.83 -02 45 56.1 q L22
2013-10-29 18:42:14 C 00 52 50.48 -02 46 00.3 q L22
2013-10-29 18:44:52 C 00 52 50.16 -02 46 06.1 q L22
2013-10-31 04:27:46 C 00 48 01.86 -03 50 25.9 q 703
2013-10-31 04:42:25 C 00 47 59.58 -03 50 54.2 q 703
2013-10-31 04:57:06 C 00 47 57.23 -03 51 23.1 q 703
2013-10-31 05:11:49 C 00 47 54.88 -03 51 51.7 q 703
2013-11-01 18:59:49 C 00 42 20.26 -05 06 53.9 q 121
2013-11-01 19:01:52 C 00 42 19.85 -05 06 58.5 q 121
2013-11-01 19:03:57 C 00 42 19.53 -05 07 02.6 q 121
2013-11-01 19:06:00 C 00 42 19.14 -05 07 07.2 q 121
2013-11-01 19:08:04 C 00 42 18.85 -05 07 11.0 q 121
2013-11-01 19:10:10 C 00 42 18.44 -05 07 15.8 q 121
2013-11-01 19:12:13 C 00 42 18.18 -05 07 19.3 q 121
2013-11-01 19:14:18 C 00 42 17.90 -05 07 23.2 q 121
2013-11-01 19:16:21 C 00 42 17.48 -05 07 28.0 q 121
2013-11-01 19:19:09 C 00 42 17.09 -05 07 33.1 q 121
2013-11-01 19:21:13 C 00 42 16.70 -05 07 37.7 q 121
2013-11-01 19:23:18 C 00 42 16.39 -05 07 41.6 q 121
2013-11-01 19:29:29 C 00 42 15.42 -05 07 53.8 q 121
2013-11-01 19:31:34 C 00 42 15.06 -05 07 58.2 q 121
2013-11-01 19:33:37 C 00 42 14.73 -05 08 02.4 q 121
2013-11-01 19:41:53 C 00 42 13.39 -05 08 19.0 q 121
2013-11-01 19:43:58 C 00 42 13.06 -05 08 23.1 q 121
2013-11-01 19:46:01 C 00 42 12.70 -05 08 27.5 q 121
2013-11-01 19:48:06 C 00 42 12.37 -05 08 31.6 q 121
2013-11-01 19:50:09 C 00 42 12.00 -05 08 36.0 q 121
2013-11-01 19:52:14 C 00 42 11.70 -05 08 39.9 q 121
2013-11-01 19:54:17 C 00 42 11.40 -05 08 43.8 q 121
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)