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
2025-11-09 08:17:14 v 1 175.46552 -37.91876 270
2025-11-09 08:19:19 C 04 36 30.072 -06 57 53.42 W W60
2025-11-09 08:22:44 V 04 36 42.91 -06 56 26.7 V 270
2025-11-09 08:22:44 v 1 175.46552 -37.91876 270
2025-11-09 08:31:20 V 04 36 45.40 -06 57 16.9 V 270
2025-11-09 08:31:20 v 1 175.46552 -37.91876 270
2025-11-09 08:36:14 V 04 36 46.81 -06 57 46.0 V 270
2025-11-09 08:36:14 v 1 175.46552 -37.91876 270
2025-11-10 09:48:31 C 04 44 36.924 -09 39 23.69 V 703
2025-11-10 09:51:51 C 04 44 37.957 -09 39 45.76 V 703
2025-11-10 09:55:10 C 04 44 38.969 -09 40 08.00 V 703
2025-11-10 09:58:29 C 04 44 39.991 -09 40 30.47 V 703
2025-11-10 10:35:23 V 04 44 50.97 -09 44 40.7 V 270
2025-11-10 10:35:23 v 1 254.05000 +35.52000 270
2025-11-10 10:35:47 V 04 45 03.24 -09 41 50.9 V 270
2025-11-10 10:35:47 v 1 151.66013 -32.96848 270
2025-11-10 10:41:52 V 04 44 52.92 -09 45 26.6 V 270
2025-11-10 10:41:52 v 1 254.05000 +35.52000 270
2025-11-10 10:48:09 V 04 44 54.89 -09 46 08.7 V 270
2025-11-10 10:48:09 v 1 254.05000 +35.52000 270
2025-11-10 10:54:38 V 04 44 56.89 -09 46 52.6 V 270
2025-11-10 10:54:38 v 1 254.05000 +35.52000 270
2025-11-10 10:56:08 V 04 45 10.15 -09 44 14.5 V 270
2025-11-10 10:56:08 v 1 151.66013 -32.96848 270
2025-11-10 11:16:43 V 04 45 16.51 -09 46 26.1 V 270
2025-11-10 11:16:43 v 1 151.66013 -32.96848 270
2025-11-10 11:37:01 V 04 45 23.34 -09 48 49.9 V 270
2025-11-10 11:37:01 v 1 151.66013 -32.96848 270
2025-11-10 23:39:55 V 04 49 38.67 -11 16 43.8 V 270
2025-11-10 23:39:55 v 1 359.62621 +49.20369 270
2025-11-10 23:53:17 V 04 49 43.21 -11 18 21.0 V 270
2025-11-10 23:53:17 v 1 359.62621 +49.20369 270
2025-11-11 00:08:35 V 04 49 48.72 -11 20 15.9 V 270
2025-11-11 00:08:35 v 1 359.62621 +49.20369 270
2025-11-11 00:21:17 V 04 49 52.84 -11 21 47.2 V 270
2025-11-11 00:21:17 v 1 359.62621 +49.20369 270
2025-11-11 05:26:16 V 04 51 52.45 -11 58 41.6 V 270
2025-11-11 05:26:16 v 1 262.25299 +30.53190 270
2025-11-11 05:32:45 V 04 51 54.71 -11 59 28.8 V 270
2025-11-11 05:32:45 v 1 262.25299 +30.53190 270
2025-11-11 05:39:26 V 04 51 57.09 -12 00 19.4 V 270
2025-11-11 05:39:26 v 1 262.25299 +30.53190 270
2025-11-11 05:45:36 V 04 51 59.27 -12 01 06.1 V 270
2025-11-11 05:45:36 v 1 262.25299 +30.53190 270
2025-11-11 06:47:27 C 04 52 16.740 -12 06 19.62 V W68
2025-11-11 06:51:26 C 04 52 18.137 -12 06 49.61 V W68
2025-11-11 07:00:15 C 04 52 21.214 -12 07 55.74 V W68
2025-11-11 07:30:38 C 04 52 31.898 -12 11 44.30 V W68
2025-11-11 11:44:40 C 04 54 16.291 -12 46 24.08 X F51
2025-11-11 12:00:38 C 04 54 22.003 -12 48 27.75 X F51
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)