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
2025-11-06 21:05:14 C 04 21 43.07 -01 59 13.8 X C40
2025-11-06 21:07:47 C 04 21 43.57 -01 59 24.9 X C40
2025-11-06 21:10:21 C 04 21 44.06 -01 59 36.1 X C40
2025-11-06 21:12:48 C 04 21 44.54 -01 59 46.8 X C40
2025-11-06 21:15:09 C 04 21 44.99 -01 59 57.1 X C40
2025-11-06 21:17:30 C 04 21 45.45 -02 00 07.2 X C40
2025-11-06 21:19:52 C 04 21 45.90 -02 00 17.5 X C40
2025-11-06 21:45:56 C 04 21 50.95 -02 02 10.9 X D04
2025-11-06 21:48:25 C 04 21 51.39 -02 02 21.7 X D04
2025-11-06 21:57:41 C 04 21 53.17 -02 03 02.5 X D04
2025-11-06 21:59:58 C 04 21 53.61 -02 03 12.7 X D04
2025-11-06 22:02:15 C 04 21 54.05 -02 03 22.4 X D04
2025-11-07 04:30:04 V 04 23 23.87 -02 31 44.8 V 270
2025-11-07 04:30:04 v 1 254.05000 +35.52000 270
2025-11-07 04:36:57 V 04 23 25.16 -02 32 14.0 V 270
2025-11-07 04:36:57 v 1 254.05000 +35.52000 270
2025-11-07 04:42:54 V 04 23 26.43 -02 32 41.7 V 270
2025-11-07 04:42:54 v 1 254.05000 +35.52000 270
2025-11-07 04:48:59 V 04 23 27.81 -02 33 11.6 V 270
2025-11-07 04:48:59 v 1 254.05000 +35.52000 270
2025-11-07 04:57:50 V 04 23 29.27 -02 33 43.4 V 270
2025-11-07 04:57:50 v 1 262.25302 +30.53203 270
2025-11-07 05:23:48 V 04 23 34.47 -02 35 40.8 V 270
2025-11-07 05:23:48 v 1 262.25302 +30.53203 270
2025-11-07 05:32:52 V 04 23 36.28 -02 36 22.3 V 270
2025-11-07 05:32:52 v 1 262.25302 +30.53203 270
2025-11-07 05:41:32 V 04 23 38.01 -02 37 01.1 V 270
2025-11-07 05:41:32 v 1 262.25302 +30.53203 270
2025-11-07 12:02:31 V 04 25 07.20 -03 06 17.2 V 270
2025-11-07 12:02:31 v 1 134.35902 +35.08986 270
2025-11-07 12:03:25 V 04 25 07.53 -03 06 22.9 V 270
2025-11-07 12:03:25 v 1 134.35902 +35.08986 270
2025-11-07 12:10:18 V 04 25 09.36 -03 06 59.3 V 270
2025-11-07 12:10:18 v 1 134.35902 +35.08986 270
2025-11-07 12:11:21 V 04 25 09.14 -03 07 00.4 V 270
2025-11-07 12:11:21 v 1 134.35902 +35.08986 270
2025-11-07 20:25:43 C 04 27 03.87 -03 46 42.9 X C40
2025-11-07 20:28:19 C 04 27 04.45 -03 46 55.4 X C40
2025-11-07 20:30:53 C 04 27 05.02 -03 47 08.2 X C40
2025-11-07 20:33:28 C 04 27 05.59 -03 47 20.8 X C40
2025-11-07 20:36:03 C 04 27 06.15 -03 47 33.4 X C40
2025-11-07 20:38:36 C 04 27 06.74 -03 47 46.2 X C40
2025-11-07 20:41:11 C 04 27 07.28 -03 47 58.6 X C40
2025-11-07 20:43:45 C 04 27 07.85 -03 48 11.2 X C40
2025-11-07 20:46:13 C 04 27 08.38 -03 48 23.1 X C40
2025-11-07 20:48:34 C 04 27 08.90 -03 48 34.7 X C40
2025-11-07 20:50:55 C 04 27 09.43 -03 48 46.3 X C40
2025-11-07 20:53:17 C 04 27 09.96 -03 48 57.8 X C40
2025-11-07 22:06:45 B 04 27 25.95 -03 55 02.0 X L76
2025-11-07 22:12:31 B 04 27 27.21 -03 55 30.5 X L76
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)