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
2025-07-03 14:09:36 C 00 41 07.589 +06 43 32.10 X F52
2025-07-03 14:24:15 C 00 41 08.670 +06 43 39.00 X F52
2025-07-27 13:46:42 C 01 23 40.724 +10 53 45.05 X F51
2025-07-27 14:04:35 C 01 23 41.984 +10 53 52.19 X F51
2025-07-27 14:22:33 C 01 23 43.246 +10 53 59.42 X F51
2025-07-27 14:40:32 C 01 23 44.508 +10 54 06.54 X F51
2025-08-27 12:40:57 C 02 15 35.891 +14 55 22.50 X F51
2025-08-27 12:41:54 C 02 15 35.952 +14 55 22.68 X F51
2025-08-27 12:56:37 C 02 15 36.878 +14 55 26.28 X F51
2025-08-27 12:57:33 C 02 15 36.934 +14 55 26.56 X F51
2025-08-27 13:12:17 C 02 15 37.859 +14 55 30.10 X F51
2025-08-27 13:13:14 C 02 15 37.914 +14 55 30.27 X F51
2025-08-27 13:28:01 C 02 15 38.842 +14 55 33.86 X F51
2025-08-27 13:28:59 C 02 15 38.906 +14 55 34.10 X F51
2025-08-28 12:30:02 C 02 17 10.946 +15 00 55.96 X F52
2025-08-28 12:48:19 C 02 17 12.086 +15 01 00.37 X F52
2025-08-28 13:06:45 C 02 17 13.244 +15 01 04.75 X F52
2025-08-28 13:25:20 C 02 17 14.409 +15 01 09.06 X F52
2025-09-03 12:23:27 C 02 26 37.113 +15 30 47.85 X F52
2025-09-03 12:41:01 C 02 26 38.174 +15 30 51.22 X F52
2025-09-03 12:58:53 C 02 26 39.249 +15 30 54.54 X F52
2025-09-15 14:19:42 C 02 44 54.580 +16 08 10.95 X F52
2025-09-15 14:35:38 C 02 44 55.469 +16 08 11.85 X F52
2025-09-15 14:51:29 C 02 44 56.352 +16 08 12.89 X F52
2025-09-19 01:48:08 C 02 49 58.838 +16 12 14.00 V M22
2025-09-19 02:27:53 C 02 50 00.955 +16 12 14.15 V M22
2025-09-19 03:07:31 C 02 50 03.259 +16 12 15.16 V M22
2025-09-19 03:19:31 C 02 50 03.806 +16 12 14.94 V M22
2025-09-22 14:04:21 C 02 54 59.609 +16 11 48.83 X F51
2025-09-22 14:41:03 C 02 55 01.540 +16 11 47.56 X F51
2025-09-22 14:59:25 C 02 55 02.513 +16 11 46.87 X F51
2025-09-23 11:50:17 C 02 56 17.280 +16 11 05.39 V T05
2025-09-23 11:52:55 C 02 56 17.458 +16 11 04.67 V T05
2025-09-23 12:28:52 C 02 56 19.375 +16 11 03.70 V T05
2025-09-23 12:33:26 C 02 56 19.582 +16 11 03.52 V T05
2025-09-26 00:18:35 C 02 59 49.704 +16 07 22.69 V R17
2025-09-26 00:34:19 C 02 59 50.546 +16 07 21.40 V R17
2025-09-26 00:54:43 C 02 59 51.643 +16 07 20.28 V R17
2025-09-26 01:15:04 C 02 59 52.702 +16 07 18.73 V R17
2025-09-29 11:41:30 C 03 04 37.382 +15 58 14.66 V T05
2025-09-29 11:44:54 C 03 04 37.457 +15 58 14.48 V T05
2025-09-29 11:49:27 C 03 04 37.800 +15 58 12.68 V T05
2025-09-29 11:57:59 C 03 04 38.244 +15 58 11.86 V T05
2025-09-30 11:49:40 C 03 06 00.202 +15 54 34.52 V T05
2025-09-30 12:20:07 C 03 06 01.692 +15 54 29.52 V T05
2025-09-30 12:24:43 C 03 06 01.925 +15 54 28.73 V T05
2025-09-30 12:29:18 C 03 06 02.153 +15 54 28.48 V T05
2025-10-03 10:55:53 C 03 10 04.022 +15 40 51.10 V T05
2025-10-03 10:59:54 C 03 10 04.226 +15 40 50.70 V T05
2025-10-03 11:03:53 C 03 10 04.385 +15 40 50.16 V T05
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)