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
2025-11-11 12:16:35 C 04 54 27.716 -12 50 31.13 X F51
2025-11-11 14:03:26 V 04 55 16.24 -13 04 41.2 V 270
2025-11-11 14:03:26 v 1 139.13620 +35.33846 270
2025-11-11 14:10:51 V 04 55 19.70 -13 05 48.5 V 270
2025-11-11 14:10:51 v 1 139.13620 +35.33846 270
2025-11-11 14:16:53 V 04 55 21.97 -13 06 37.7 V 270
2025-11-11 14:16:53 v 1 139.13620 +35.33846 270
2025-11-11 14:22:50 V 04 55 24.23 -13 07 24.8 V 270
2025-11-11 14:22:50 v 1 139.13620 +35.33846 270
2025-11-12 04:08:06 V 05 01 20.19 -14 59 25.8 V 270
2025-11-12 04:08:06 v 1 270.60709 +43.01174 270
2025-11-12 04:18:01 V 05 01 24.36 -15 00 49.6 V 270
2025-11-12 04:18:01 v 1 270.60709 +43.01174 270
2025-11-12 04:21:12 V 05 01 25.77 -15 01 17.9 V 270
2025-11-12 04:21:12 v 1 270.60709 +43.01174 270
2025-11-12 04:26:58 V 05 01 28.17 -15 02 05.1 V 270
2025-11-12 04:26:58 v 1 270.60709 +43.01174 270
2025-11-12 09:31:57 C 05 03 40.316 -15 45 29.95 V 703
2025-11-12 09:35:14 C 05 03 41.706 -15 45 58.39 V 703
2025-11-12 09:38:31 C 05 03 43.099 -15 46 26.76 V 703
2025-11-12 09:41:48 C 05 03 44.489 -15 46 55.16 V 703
2025-11-12 09:43:49 C 05 03 53.455 -15 46 37.09 V T08
2025-11-12 09:49:51 C 05 03 56.035 -15 47 30.19 V T08
2025-11-12 10:33:18 C 05 04 14.513 -15 53 52.30 V T08
2025-11-12 10:41:56 C 05 04 18.168 -15 55 08.26 V T08
2025-11-12 11:02:15 V 05 04 33.10 -15 55 14.9 V 270
2025-11-12 11:02:15 v 1 151.66012 -32.96848 270
2025-11-12 11:20:29 V 05 04 41.41 -15 57 56.6 V 270
2025-11-12 11:20:29 v 1 151.66012 -32.96848 270
2025-11-12 11:41:13 V 05 04 50.78 -16 01 01.0 V 270
2025-11-12 11:41:13 v 1 151.66012 -32.96848 270
2025-11-12 12:04:14 V 05 05 01.15 -16 04 26.0 V 270
2025-11-12 12:04:14 v 1 151.66012 -32.96848 270
2025-11-13 06:49:52 V 05 14 26.26 -19 00 55.4 V 270
2025-11-13 06:49:52 v 1 270.60692 +43.01213 270
2025-11-13 07:12:27 V 05 14 37.62 -19 04 34.1 V 270
2025-11-13 07:12:27 v 1 270.60692 +43.01213 270
2025-11-13 07:35:17 V 05 14 49.22 -19 08 14.9 V 270
2025-11-13 07:35:17 v 1 270.60692 +43.01213 270
2025-11-13 07:58:42 V 05 15 01.05 -19 12 01.8 V 270
2025-11-13 07:58:42 v 1 270.60692 +43.01213 270
2025-11-15 07:07:12 V 05 46 11.06 -27 40 04.7 V 270
2025-11-15 07:07:12 v 1 254.05000 +35.52000 270
2025-11-15 07:13:45 V 05 46 15.85 -27 41 22.1 V 270
2025-11-15 07:13:45 v 1 254.05000 +35.52000 270
2025-11-15 07:20:14 V 05 46 20.66 -27 42 39.7 V 270
2025-11-15 07:20:14 v 1 254.05000 +35.52000 270
2025-11-15 07:26:48 V 05 46 25.53 -27 43 57.3 V 270
2025-11-15 07:26:48 v 1 254.05000 +35.52000 270
2025-11-15 10:23:54 V 05 48 52.68 -28 14 45.1 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)