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
2025-11-07 22:18:08 B 04 27 28.45 -03 55 58.2 X L76
2025-11-07 22:23:38 B 04 27 29.65 -03 56 25.4 X L76
2025-11-07 23:29:30 V 04 27 46.50 -04 01 52.0 V 270
2025-11-07 23:29:30 v 1 016.33584 +48.20433 270
2025-11-07 23:40:53 V 04 27 48.94 -04 02 48.3 V 270
2025-11-07 23:40:53 v 1 016.33584 +48.20433 270
2025-11-07 23:54:25 V 04 27 52.00 -04 03 56.5 V 270
2025-11-07 23:54:25 v 1 016.33584 +48.20433 270
2025-11-08 00:09:31 V 04 27 55.32 -04 05 11.3 V 270
2025-11-08 00:09:31 v 1 016.33584 +48.20433 270
2025-11-08 06:35:32 C 04 29 31.001 -04 35 06.32 V W68
2025-11-08 06:39:32 C 04 29 31.896 -04 35 26.88 V W68
2025-11-08 07:19:56 C 04 29 40.961 -04 38 54.49 V W68
2025-11-08 07:27:18 C 04 29 42.619 -04 39 32.29 V W68
2025-11-08 10:36:58 V 04 30 41.26 -04 55 48.8 V 270
2025-11-08 10:36:58 v 1 151.66013 -32.96848 270
2025-11-08 10:46:53 V 04 30 43.64 -04 56 40.5 V 270
2025-11-08 10:46:53 v 1 151.66013 -32.96848 270
2025-11-08 10:54:44 V 04 30 45.40 -04 57 18.3 V 270
2025-11-08 10:54:44 v 1 151.66013 -32.96848 270
2025-11-08 11:10:30 V 04 30 49.47 -04 58 45.7 V 270
2025-11-08 11:10:30 v 1 151.66013 -32.96848 270
2025-11-08 21:13:14 C 04 33 27.54 -05 55 47.6 X C40
2025-11-08 21:15:49 C 04 33 28.19 -05 56 01.9 X C40
2025-11-08 21:18:23 C 04 33 28.83 -05 56 16.3 X C40
2025-11-08 21:20:57 C 04 33 29.47 -05 56 30.5 X C40
2025-11-08 21:23:31 C 04 33 30.11 -05 56 44.8 X C40
2025-11-08 21:26:05 C 04 33 30.75 -05 56 59.1 X C40
2025-11-08 21:28:39 C 04 33 31.40 -05 57 13.3 X C40
2025-11-08 21:31:12 C 04 33 32.03 -05 57 27.6 X C40
2025-11-08 21:33:40 C 04 33 32.65 -05 57 41.3 X C40
2025-11-08 21:36:00 C 04 33 33.23 -05 57 54.3 X C40
2025-11-08 21:38:22 C 04 33 33.82 -05 58 07.4 X C40
2025-11-08 21:40:44 C 04 33 34.42 -05 58 20.5 X C40
2025-11-08 22:07:07 B 04 33 45.833 -06 00 30.74 W J37
2025-11-08 22:31:21 B 04 33 52.133 -06 02 46.86 W J37
2025-11-08 22:58:40 B 04 33 59.177 -06 05 20.83 W J37
2025-11-09 04:55:33 V 04 35 40.90 -06 38 55.4 V 270
2025-11-09 04:55:33 v 1 262.25292 +30.53186 270
2025-11-09 05:20:16 V 04 35 47.59 -06 41 21.7 V 270
2025-11-09 05:20:16 v 1 262.25292 +30.53186 270
2025-11-09 05:38:12 V 04 35 52.11 -06 43 06.8 V 270
2025-11-09 05:38:12 v 1 262.25292 +30.53186 270
2025-11-09 06:03:15 V 04 35 58.74 -06 45 31.9 V 270
2025-11-09 06:03:15 v 1 262.25292 +30.53186 270
2025-11-09 06:36:41 C 04 36 03.970 -06 47 54.74 W W60
2025-11-09 06:50:17 C 04 36 07.392 -06 49 13.98 W W60
2025-11-09 07:03:52 C 04 36 10.810 -06 50 33.07 W W60
2025-11-09 08:05:44 C 04 36 26.587 -06 56 34.37 W W60
2025-11-09 08:17:14 V 04 36 41.36 -06 55 54.3 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)