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
2025-10-17 19:57:46 C 03 30 25.24 +13 07 46.3 V M31
2025-10-17 19:59:51 C 03 30 25.37 +13 07 44.7 V M31
2025-10-17 20:01:54 C 03 30 25.50 +13 07 43.2 V M31
2025-10-17 20:03:59 C 03 30 25.63 +13 07 41.8 V M31
2025-10-18 11:32:29 C 03 31 22.199 +12 56 23.21 V G96
2025-10-18 11:39:54 C 03 31 22.609 +12 56 17.38 V G96
2025-10-18 11:47:17 C 03 31 23.020 +12 56 11.47 V G96
2025-10-18 11:54:41 C 03 31 23.430 +12 56 05.57 V G96
2025-10-18 23:29:09 C 03 32 10.975 +12 47 52.87 V M22
2025-10-18 23:31:06 C 03 32 11.090 +12 47 51.43 V M22
2025-10-18 23:38:54 C 03 32 11.515 +12 47 45.02 V M22
2025-10-19 00:04:57 C 03 32 12.886 +12 47 24.29 V M22
2025-10-19 01:13:53 C 03 32 16.96 +12 45 25.4 557
2025-10-19 02:08:45 C 03 32 20.05 +12 44 40.8 557
2025-10-19 03:03:38 C 03 32 23.18 +12 43 55.7 557
2025-10-19 03:58:32 C 03 32 26.39 +12 43 10.2 557
2025-10-19 09:15:55 C 03 32 48.746 +12 39 06.23 V 703
2025-10-19 09:19:11 C 03 32 48.934 +12 39 03.42 V 703
2025-10-19 09:22:26 C 03 32 49.110 +12 39 00.68 V 703
2025-10-19 09:25:41 C 03 32 49.268 +12 38 57.98 V 703
2025-10-20 01:04:03 C 03 33 53.258 +12 25 47.60 V R17
2025-10-20 01:23:34 C 03 33 54.326 +12 25 30.97 V R17
2025-10-20 01:43:03 C 03 33 55.390 +12 25 14.30 V R17
2025-10-20 02:03:02 C 03 33 56.472 +12 24 57.17 V R17
2025-10-20 07:57:42 C 03 34 20.622 +12 19 42.71 V 703
2025-10-20 08:01:01 C 03 34 20.816 +12 19 39.68 V 703
2025-10-20 08:04:20 C 03 34 20.982 +12 19 36.73 V 703
2025-10-20 08:07:39 C 03 34 21.162 +12 19 34.10 V 703
2025-10-20 23:55:57 B 03 35 26.61 +12 05 09.0 V R53
2025-10-20 23:59:31 B 03 35 26.81 +12 05 05.7 V R53
2025-10-21 00:02:35 B 03 35 26.99 +12 05 03.0 V R53
2025-10-21 05:28:19 C 03 35 48.816 +12 00 55.44 V W68
2025-10-21 05:30:57 C 03 35 48.953 +12 00 52.92 V W68
2025-10-21 05:35:31 C 03 35 49.217 +12 00 48.78 V W68
2025-10-21 05:42:49 C 03 35 49.627 +12 00 41.83 V W68
2025-10-21 08:26:55 C 03 36 00.976 +11 57 11.84 V 703
2025-10-21 08:30:15 C 03 36 01.156 +11 57 08.68 V 703
2025-10-21 08:33:34 C 03 36 01.346 +11 57 05.76 V 703
2025-10-21 08:36:54 C 03 36 01.537 +11 57 02.52 V 703
2025-10-21 18:40:34 C 03 36 42.74 +11 47 15.6 V D29
2025-10-21 19:00:56 C 03 36 43.90 +11 46 55.1 V D29
2025-10-21 19:21:18 C 03 36 45.09 +11 46 34.8 V D29
2025-10-21 23:01:53 C 03 37 02.942 +11 43 52.72 V M22
2025-10-21 23:06:26 C 03 37 03.209 +11 43 48.25 V M22
2025-10-21 23:09:43 C 03 37 03.396 +11 43 44.94 V M22
2025-10-21 23:53:42 C 03 37 05.928 +11 43 01.49 V M22
2025-10-22 20:31:34 C 03 38 32.73 +11 20 38.5 V D29
2025-10-22 20:51:56 C 03 38 34.02 +11 20 16.0 V D29
2025-10-22 21:12:17 C 03 38 35.33 +11 19 53.6 V D29
2025-10-22 23:23:52 B 03 38 49.40 +11 17 30.3 V R53
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)