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
2005-12-04 11:27:06 C 22 42 06.04 -18 16 21.0 r E12
2005-12-04 11:35:41 C 22 42 05.65 -18 16 25.9 r E12
2005-12-04 11:44:19 C 22 42 05.32 -18 16 30.9 r E12
2005-12-04 11:52:54 C 22 42 05.00 -18 16 35.8 r E12
2009-09-14 07:45:14 C 01 32 12.41 +11 01 47.6 19.4 c 704
2009-09-14 08:02:04 C 01 32 12.08 +11 01 42.7 20.2 c 704
2009-09-14 08:18:54 C 01 32 11.81 +11 01 39.0 19.8 c 704
2009-09-14 08:35:45 C 01 32 11.52 +11 01 34.7 20.0 c 704
2009-09-14 08:52:37 C 01 32 11.20 +11 01 30.4 20.3 c 704
2009-09-15 08:11:17 C 01 31 52.33 +10 55 30.8 o 691
2009-09-15 08:36:47 C 01 31 51.67 +10 55 26.5 o 691
2009-09-15 09:02:12 C 01 31 51.16 +10 55 19.8 o 691
2009-09-19 07:07:46 C 01 29 55.38 +10 25 34.7 o 691
2009-09-19 07:33:13 C 01 29 54.58 +10 25 24.2 o 691
2009-09-19 07:58:41 C 01 29 53.77 +10 25 14.6 o 691
2009-09-21 07:46:31 C 01 28 29.85 +10 06 23.4 r 683
2009-09-21 08:05:58 C 01 28 29.23 +10 06 15.1 r 683
2009-09-21 08:25:34 C 01 28 28.40 +10 06 07.1 r 683
2009-09-22 01:21:07 C 01 27 53.90 +09 58 42.7 c A50
2009-09-22 01:51:55 C 01 27 52.67 +09 58 28.6 c A50
2009-09-22 07:41:47 C 01 27 41.53 +09 55 59.0 r 683
2009-09-22 08:01:14 C 01 27 40.72 +09 55 49.0 r 683
2009-09-22 08:20:50 C 01 27 39.91 +09 55 39.1 r 683
2009-09-23 01:31:56 C 01 27 01.55 +09 47 40.3 c A50
2009-09-23 02:02:45 C 01 27 00.28 +09 47 23.9 c A50
2009-09-23 07:14:55 C 01 26 49.74 +09 45 03.4 o 691
2009-09-23 07:36:58 C 01 26 48.70 +09 44 51.8 r 683
2009-09-23 07:40:22 C 01 26 48.62 +09 44 51.2 o 691
2009-09-23 08:05:49 C 01 26 47.48 +09 44 39.4 o 691
2009-09-23 08:15:59 C 01 26 46.93 +09 44 35.1 r 683
2009-09-24 02:10:27 C 01 26 03.87 +09 35 41.8 r 130
2009-09-24 02:14:22 C 01 26 03.66 +09 35 39.4 r 130
2009-09-24 02:18:42 C 01 26 03.48 +09 35 37.3 r 130
2009-09-24 02:23:11 C 01 26 03.23 +09 35 35.3 r 130
2009-09-25 06:46:16 C 01 24 51.68 +09 20 55.2 18.4 c 704
2009-09-25 07:03:31 C 01 24 50.80 +09 20 45.5 18.6 c 704
2009-09-25 07:21:08 C 01 24 49.91 +09 20 36.0 18.4 c 704
2009-09-25 07:38:27 C 01 24 49.03 +09 20 26.6 18.5 c 704
2009-09-25 07:55:44 C 01 24 48.15 +09 20 17.8 18.7 c 704
2009-09-27 07:10:42 C 01 22 32.84 +08 53 22.2 o 691
2009-09-27 07:36:08 C 01 22 31.36 +08 53 07.0 o 691
2009-09-27 08:01:32 C 01 22 29.89 +08 52 51.8 o 691
2009-09-29 00:02:35 C 01 20 20.31 +08 27 34.0 o B88
2009-09-29 00:10:17 C 01 20 19.84 +08 27 29.3 o B88
2009-09-29 00:17:59 C 01 20 19.37 +08 27 24.1 o B88
2009-10-07 23:51:40 C 01 04 50.24 +05 31 59.0 17.3 r 084
2009-10-08 19:56:47 C 01 03 04.89 +05 12 15.2 17.4 o C20
2009-10-08 19:59:53 C 01 03 04.60 +05 12 12.1 17.3 o C20
2009-10-09 06:59:44 C 01 02 04.59 +05 01 09.8 r 703
2009-10-09 07:10:12 C 01 02 03.58 +05 00 59.7 r 703
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)