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
2013-09-04 08:17:00 C 01 50 25.76 +13 00 42.5 N I41
2013-09-06 10:07:39 C 01 51 43.12 +13 01 45.8 N I41
2013-09-06 11:00:48 C 01 51 44.17 +13 01 46.2 N I41
2013-09-06 11:54:32 C 01 51 45.24 +13 01 46.3 N I41
2013-09-08 07:55:33 C 01 52 46.27 +13 01 23.3 q H15
2013-09-08 08:10:48 C 01 52 46.55 +13 01 23.8 q H15
2013-09-08 08:25:42 C 01 52 46.78 +13 01 23.9 q H15
2013-09-08 08:41:02 C 01 52 47.06 +13 01 23.6 q H15
2013-09-13 09:30:10 C 01 54 49.07 +12 53 43.7 q G96
2013-09-13 09:31:00 C 01 54 49.08 +12 53 43.8 q G96
2013-09-13 09:43:09 C 01 54 49.16 +12 53 42.2 q G96
2013-09-13 09:44:00 C 01 54 49.17 +12 53 42.5 q G96
2013-09-13 09:56:14 C 01 54 49.26 +12 53 40.8 q G96
2013-09-13 09:57:05 C 01 54 49.26 +12 53 40.9 q G96
2013-09-13 10:09:19 C 01 54 49.37 +12 53 39.0 q G96
2013-09-13 10:10:09 C 01 54 49.35 +12 53 39.7 q G96
2013-09-25 08:14:15 C 01 54 37.73 +11 47 30.6 q 703
2013-09-25 08:23:53 C 01 54 37.49 +11 47 26.1 q 703
2013-09-25 08:33:36 C 01 54 37.31 +11 47 22.5 q 703
2013-09-25 08:43:26 C 01 54 37.09 +11 47 19.1 q 703
2013-09-29 15:29:36 C 01 52 24.75 +11 02 16.4 q D29
2013-09-29 15:52:31 C 01 52 23.96 +11 02 05.0 q D29
2013-09-29 16:15:25 C 01 52 23.07 +11 01 52.3 q D29
2013-10-03 06:50:55 C 01 49 27.40 +10 12 53.7 q G96
2013-10-03 07:01:07 C 01 49 26.92 +10 12 47.4 q G96
2013-10-03 07:11:17 C 01 49 26.44 +10 12 41.0 q G96
2013-10-03 07:21:22 C 01 49 25.96 +10 12 34.7 q G96
2013-10-03 10:00:13 C 01 49 19.841 +10 11 00.41 L F51
2013-10-03 10:22:16 C 01 49 18.772 +10 10 46.55 L F51
2013-10-03 10:44:03 C 01 49 17.709 +10 10 32.86 L F51
2013-10-03 11:05:58 C 01 49 16.637 +10 10 19.01 L F51
2013-10-08 18:04:37 C 01 42 57.65 +08 36 32.0 q D29
2013-10-08 18:33:14 C 01 42 55.76 +08 36 07.8 q D29
2013-10-08 19:01:53 C 01 42 53.82 +08 35 43.0 q D29
2013-10-10 14:56:43 C 01 40 10.88 +07 56 48.2 q D29
2013-10-10 15:25:20 C 01 40 08.75 +07 56 21.9 q D29
2013-10-10 15:53:59 C 01 40 06.60 +07 55 55.6 q D29
2013-10-11 23:48:39 C 01 37 53.87 +07 25 13.5 q D00
2013-10-12 00:04:27 C 01 37 52.66 +07 24 57.5 q D00
2013-10-12 00:20:12 C 01 37 51.31 +07 24 42.5 q D00
2013-10-12 00:36:01 C 01 37 50.09 +07 24 27.0 q D00
2013-10-12 09:28:05 C 01 37 12.36 +07 15 43.7 q G96
2013-10-12 09:38:13 C 01 37 11.54 +07 15 33.4 q G96
2013-10-12 09:48:20 C 01 37 10.72 +07 15 23.1 q G96
2013-10-12 09:58:29 C 01 37 09.90 +07 15 12.8 q G96
2013-10-12 11:01:44 C 01 37 04.88 +07 14 08.2 q G96
2013-10-12 11:02:42 C 01 37 04.79 +07 14 07.2 q G96
2013-10-12 11:03:40 C 01 37 04.71 +07 14 06.2 q G96
2013-10-12 11:04:37 C 01 37 04.63 +07 14 05.2 q G96
2013-10-13 18:49:15 C 01 34 44.37 +06 40 50.9 q G34
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)