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
2013-11-01 19:56:21 C 00 42 11.04 -05 08 48.2 q 121
2013-11-01 19:58:26 C 00 42 10.71 -05 08 52.2 q 121
2013-11-01 20:00:29 C 00 42 10.33 -05 08 57.0 q 121
2013-11-01 20:02:34 C 00 42 10.04 -05 09 00.6 q 121
2013-11-01 20:04:37 C 00 42 09.77 -05 09 04.5 q 121
2013-11-01 20:06:42 C 00 42 09.36 -05 09 08.8 q 121
2013-11-01 20:10:11 C 00 42 08.73 -05 09 16.6 q 121
2013-11-01 20:12:15 C 00 42 08.48 -05 09 20.1 q 121
2013-11-01 20:14:20 C 00 42 08.18 -05 09 24.2 q 121
2013-11-01 20:16:23 C 00 42 07.81 -05 09 28.4 q 121
2013-11-01 20:18:28 C 00 42 07.50 -05 09 32.4 q 121
2013-11-19 05:46:07 C 23 27 57.887 -20 56 35.55 L F51
2013-11-19 06:21:12 C 23 27 49.755 -20 58 01.15 L F51
2013-11-19 06:39:35 C 23 27 45.498 -20 58 45.59 L F51
2014-06-27 09:03:45 C 18 18 45.211 -14 41 41.56 L F51
2014-06-27 09:25:24 C 18 18 42.892 -14 41 44.77 L F51
2014-06-27 09:47:34 C 18 18 40.522 -14 41 47.99 L F51
2014-06-27 10:09:35 C 18 18 38.166 -14 41 51.22 L F51
2017-09-03 03:40:36 C 02 05 55.08 +14 11 18.3 20.4 q J43
2017-09-03 03:53:16 C 02 05 55.56 +14 11 19.1 20.5 q J43
2017-09-03 04:05:51 C 02 05 56.11 +14 11 21.4 19.7 q J43
2017-09-03 04:18:17 C 02 05 56.56 +14 11 22.9 19.5 q J43
2017-09-23 12:13:56 C 02 22 21.52 +14 03 49.9 L T05
2017-09-23 12:31:33 C 02 22 21.78 +14 03 46.8 L T05
2017-09-23 12:44:10 C 02 22 21.94 +14 03 44.0 L T05
2017-09-23 12:58:11 C 02 22 22.07 +14 03 41.4 L T05
2017-09-26 07:23:36 C 02 23 29.04 +13 49 14.0 q G96
2017-09-26 07:31:43 C 02 23 29.11 +13 49 12.1 q G96
2017-09-26 07:39:50 C 02 23 29.18 +13 49 10.1 q G96
2017-09-26 07:47:59 C 02 23 29.24 +13 49 08.3 q G96
2017-09-27 14:47:50 C 02 23 51.399 +13 41 03.69 L F51
2017-09-27 15:02:32 C 02 23 51.482 +13 40 59.35 L F51
2017-10-07 00:56:09 C 02 24 14.74 +12 08 01.8 q 160
2017-10-07 00:58:08 C 02 24 14.64 +12 08 00.4 q 160
2017-10-07 01:00:12 C 02 24 14.51 +12 07 58.7 q 160
2017-10-09 01:04:07 C 02 23 40.09 +11 39 08.8 q 160
2017-10-09 01:06:08 C 02 23 40.01 +11 39 08.5 q 160
2017-10-09 01:08:09 C 02 23 39.99 +11 39 07.2 q 160
2017-10-10 09:00:44 C 02 23 08.41 +11 17 57.6 U 703
2017-10-10 09:07:47 C 02 23 08.20 +11 17 52.4 U 703
2017-10-10 09:14:49 C 02 23 07.94 +11 17 47.4 U 703
2017-10-10 09:21:52 C 02 23 07.72 +11 17 41.8 U 703
2017-10-11 01:34:25 C 02 22 48.73 +11 06 04.8 q 160
2017-10-11 01:36:27 C 02 22 48.67 +11 06 03.1 q 160
2017-10-11 01:38:29 C 02 22 48.61 +11 06 01.7 q 160
2017-10-12 16:45:40 C 02 21 55.49 +10 36 16.4 q D29
2017-10-12 16:46:56 C 02 21 55.44 +10 36 15.4 q D29
2017-10-12 17:11:06 C 02 21 54.58 +10 35 56.0 q D29
2017-10-12 17:12:23 C 02 21 54.54 +10 35 55.0 q D29
2017-10-12 17:36:34 C 02 21 53.68 +10 35 35.5 q D29
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)