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
2025-11-15 10:23:54 v 1 175.46574 -37.91863 270
2025-11-15 10:30:19 V 05 48 57.57 -28 16 02.7 V 270
2025-11-15 10:30:19 v 1 175.46574 -37.91863 270
2025-11-15 10:36:56 V 05 49 02.78 -28 17 23.1 V 270
2025-11-15 10:36:56 v 1 175.46574 -37.91863 270
2025-11-15 10:43:21 V 05 49 07.83 -28 18 41.2 V 270
2025-11-15 10:43:21 v 1 175.46574 -37.91863 270
2025-11-15 11:30:00 C 05 49 39.763 -28 31 39.83 V T05
2025-11-15 11:34:34 C 05 49 43.219 -28 32 34.98 V T05
2025-11-15 11:48:58 C 05 49 54.125 -28 35 28.46 V T05
2025-11-15 11:54:15 C 05 49 58.126 -28 36 32.18 V T05
2025-11-15 15:44:16 V 05 53 10.87 -29 23 04.5 V 270
2025-11-15 15:44:16 v 1 140.17430 +36.06237 270
2025-11-15 15:51:32 V 05 53 16.64 -29 24 35.5 V 270
2025-11-15 15:51:32 v 1 140.17430 +36.06237 270
2025-11-15 15:57:46 V 05 53 21.62 -29 25 49.3 V 270
2025-11-15 15:57:46 v 1 140.17430 +36.06237 270
2025-11-15 16:03:47 V 05 53 26.53 -29 27 04.1 V 270
2025-11-15 16:03:47 v 1 140.17430 +36.06237 270
2025-11-15 22:17:32 C 05 58 57.809 -30 39 14.58 V M22
2025-11-15 22:20:07 C 05 59 00.010 -30 39 47.52 V M22
2025-11-15 22:24:03 C 05 59 03.341 -30 40 36.70 V M22
2025-11-15 22:55:10 C 05 59 29.666 -30 47 05.68 V M22
2025-11-16 03:47:17 B 06 03 49.046 -31 50 33.79 X J51
2025-11-16 03:57:44 B 06 03 58.159 -31 52 43.03 X J51
2025-11-16 04:08:11 B 06 04 07.296 -31 54 52.24 X J51
2025-11-16 10:52:29 V 06 10 54.13 -33 14 21.1 V 270
2025-11-16 10:52:29 v 1 151.66013 -32.96848 270
2025-11-16 11:11:25 V 06 11 12.63 -33 18 25.4 V 270
2025-11-16 11:11:25 v 1 151.66013 -32.96848 270
2025-11-16 11:35:49 V 06 11 36.47 -33 23 40.6 V 270
2025-11-16 11:35:49 v 1 151.66013 -32.96848 270
2025-11-16 11:54:32 V 06 11 54.87 -33 27 43.4 V 270
2025-11-16 11:54:32 v 1 151.66013 -32.96848 270
2025-11-17 04:20:12 C 06 29 28.666 -36 55 24.82 V W68
2025-11-17 04:24:50 C 06 29 33.763 -36 56 24.90 V W68
2025-11-17 04:32:25 C 06 29 42.074 -36 58 02.96 V W68
2025-11-17 04:43:52 C 06 29 54.626 -37 00 31.10 V W68
2025-11-17 05:58:08 C 06 31 16.058 -37 16 26.51 V W68
2025-11-17 06:00:48 C 06 31 18.982 -37 17 00.67 V W68
2025-11-17 06:16:59 C 06 31 36.725 -37 20 27.24 V W68
2025-11-17 06:20:57 C 06 31 41.078 -37 21 17.82 V W68
2025-11-18 06:25:53 C 07 02 36.718 -42 17 36.85 V W68
2025-11-18 06:29:28 C 07 02 41.520 -42 18 20.12 V W68
2025-11-18 06:34:16 C 07 02 47.909 -42 19 18.05 V W68
2025-11-18 06:48:44 C 07 03 07.248 -42 22 12.25 V W68
2025-11-19 04:15:12 C 07 35 56.995 -46 20 41.97 W X20
2025-11-19 04:16:00 C 07 35 58.269 -46 20 50.50 W X20
2025-11-19 04:16:19 C 07 35 58.769 -46 20 54.04 W X20
2025-11-19 10:48:16 V 07 46 51.30 -47 24 04.2 V 270
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)