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
2009-10-09 07:20:39 C 01 02 02.47 +05 00 47.5 r 703
2009-10-09 07:30:59 C 01 02 01.53 +05 00 37.9 r 703
2009-10-10 23:33:54 C 00 58 15.00 +04 18 26.5 17.0 o C20
2009-10-10 23:37:01 C 00 58 14.68 +04 18 23.2 17.1 o C20
2009-10-11 19:56:34 C 00 56 18.15 +03 56 09.7 r J75
2009-10-11 20:16:07 C 00 56 16.13 +03 55 48.5 r J75
2009-10-11 20:35:24 C 00 56 14.10 +03 55 26.9 r J75
2009-10-11 22:40:35 C 00 55 59.42 +03 53 05.6 17.3 o C20
2009-10-12 21:53:14 C 00 53 39.15 +03 26 52.0 17.3 o C20
2009-10-14 00:42:58 C 00 50 50.84 +02 55 36.4 17.2 o C20
2009-10-14 06:45:29 C 00 50 13.86 +02 48 32.8 17.6 c 704
2009-10-14 07:04:14 C 00 50 11.67 +02 48 10.4 17.9 c 704
2009-10-14 07:41:51 C 00 50 07.37 +02 47 24.9 17.9 c 704
2009-10-14 08:00:39 C 00 50 05.21 +02 47 02.9 17.5 c 704
2009-10-14 22:38:03 C 00 48 31.04 +02 29 22.6 17.1 o C20
2009-10-15 23:27:00 C 00 45 47.91 +01 58 55.3 17.1 o C20
2009-10-15 23:30:07 C 00 45 47.56 +01 58 51.5 17.1 o C20
2009-10-16 05:14:21 C 00 45 11.44 +01 51 48.7 r G96
2009-10-16 05:25:08 C 00 45 10.15 +01 51 35.2 r G96
2009-10-16 05:35:43 C 00 45 08.89 +01 51 21.9 r G96
2009-10-16 05:46:24 C 00 45 07.59 +01 51 08.6 r G96
2009-10-16 23:31:21 C 00 43 06.31 +01 28 40.0 17.2 o C20
2009-10-16 23:34:28 C 00 43 05.95 +01 28 36.4 17.1 o C20
2009-10-20 00:29:56 C 00 34 37.71 -00 06 55.2 u C05
2009-10-20 00:31:53 C 00 34 37.46 -00 06 58.0 u C05
2009-10-20 00:33:50 C 00 34 37.24 -00 07 00.4 u C05
2009-10-20 00:35:46 C 00 34 36.98 -00 07 03.1 u C05
2009-10-20 00:37:43 C 00 34 36.74 -00 07 05.8 u C05
2009-10-20 00:39:40 C 00 34 36.50 -00 07 08.3 u C05
2009-10-22 04:55:46 C 00 28 19.14 -01 18 26.8 17.1 c 704
2009-10-22 05:14:04 C 00 28 16.73 -01 18 52.1 17.1 c 704
2009-10-22 05:32:22 C 00 28 14.31 -01 19 17.6 17.6 c 704
2009-10-22 05:50:39 C 00 28 11.89 -01 19 43.0 17.5 c 704
2009-10-22 06:09:11 C 00 28 09.43 -01 20 08.7 17.7 c 704
2009-10-24 21:58:51 C 00 20 15.26 -02 50 00.2 w 160
2009-10-24 22:02:47 C 00 20 14.71 -02 50 06.0 w 160
2009-10-24 22:06:24 C 00 20 14.23 -02 50 10.8 w 160
2009-10-26 04:16:34 C 00 16 28.34 -03 33 09.5 r G96
2009-10-26 04:26:10 C 00 16 27.04 -03 33 23.2 r G96
2009-10-26 04:35:45 C 00 16 25.75 -03 33 37.0 r G96
2009-10-26 04:45:12 C 00 16 24.42 -03 33 50.5 r G96
2009-10-26 21:50:21 C 00 14 13.61 -03 58 28.1 17.3 o C20
2009-10-26 21:53:28 C 00 14 13.21 -03 58 32.6 17.2 o C20
2009-10-27 21:01:50 C 00 11 18.46 -04 31 52.5 17.2 o C20
2009-10-27 21:06:04 C 00 11 17.89 -04 31 58.5 17.2 o C20
2009-10-27 21:08:11 C 00 11 17.61 -04 32 01.5 17.1 o C20
2009-11-05 03:43:27 C 23 46 31.38 -09 16 43.6 o H47
2009-11-05 03:51:04 C 23 46 30.37 -09 16 53.5 o H47
2009-11-05 03:59:01 C 23 46 29.33 -09 17 05.3 o H47
2009-11-05 04:06:26 C 23 46 28.32 -09 17 16.1 o H47
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)