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
2005-09-15 07:39:17 C 01 06 17.60 +08 44 46.3 r 703
2005-09-15 07:50:53 C 01 06 17.17 +08 44 42.0 r 703
2005-09-23 07:18:00 C 00 56 40.05 +07 06 20.2 r 703
2005-09-23 07:34:12 C 00 56 38.86 +07 06 09.7 r 703
2005-09-23 07:50:22 C 00 56 37.78 +07 05 59.7 r 703
2005-09-23 08:06:38 C 00 56 36.63 +07 05 49.0 r 703
2005-09-24 07:05:53 C 00 55 08.20 +06 50 59.5 c 691
2005-09-24 07:30:53 C 00 55 06.51 +06 50 41.7 c 691
2005-09-24 08:00:48 C 00 55 04.24 +06 50 23.3 c 691
2005-09-25 22:25:25 C 00 52 26.18 +06 23 53.8 o 084
2005-09-25 22:30:32 C 00 52 25.78 +06 23 49.6 o 084
2005-09-26 00:31:01 C 00 52 17.28 +06 22 25.8 o J68
2005-09-26 21:55:06 C 00 50 43.84 +06 06 50.5 r 084
2005-09-26 22:00:14 C 00 50 43.44 +06 06 46.7 r 084
2005-09-28 21:35:46 C 00 47 03.87 +05 30 14.0 o 493
2005-09-28 22:42:08 C 00 46 58.22 +05 29 21.8 o 493
2005-09-29 00:33:48 C 00 46 48.60 +05 27 52.2 o 493
2005-09-29 02:34:08 C 00 46 38.13 +05 26 14.9 o 493
2005-09-29 03:52:44 C 00 46 31.39 +05 25 10.7 o 493
2005-09-29 06:36:49 C 00 46 19.42 +05 22 57.3 o 699
2005-09-29 07:09:44 C 00 46 16.52 +05 22 30.5 o 699
2005-09-29 07:31:18 C 00 46 14.82 +05 22 13.7 o 644
2005-09-29 07:42:38 C 00 46 13.65 +05 22 04.0 o 699
2005-09-29 08:03:14 C 00 46 11.99 +05 21 47.6 o 644
2005-09-29 08:15:28 C 00 46 10.76 +05 21 37.3 o 699
2005-09-29 08:33:29 C 00 46 09.31 +05 21 23.1 o 644
2005-09-30 21:28:18 C 00 43 04.84 +04 50 25.9 o 493
2005-09-30 22:48:31 C 00 42 57.53 +04 49 17.6 o 493
2005-10-01 00:51:02 C 00 42 46.04 +04 47 30.7 o 493
2005-10-01 01:32:44 C 00 42 42.23 +04 46 56.6 o 493
2005-10-01 03:51:28 C 00 42 31.85 +04 44 55.3 c 691
2005-10-01 04:21:36 C 00 42 29.11 +04 44 29.5 c 691
2005-10-01 04:51:29 C 00 42 26.35 +04 44 03.5 c 691
2005-10-02 23:17:09 C 00 38 37.26 +04 05 54.1 r 084
2005-10-04 22:48:24 C 00 34 08.32 +03 20 51.5 r 084
2005-10-04 22:54:03 C 00 34 07.73 +03 20 46.7 o 084
2005-10-05 04:52:52 C 00 33 33.99 +03 15 06.5 17.2 c 704
2005-10-05 05:08:23 C 00 33 32.37 +03 14 51.1 17.8 c 704
2005-10-05 05:23:55 C 00 33 30.75 +03 14 36.0 17.6 c 704
2005-10-05 05:39:24 C 00 33 29.16 +03 14 20.5 17.8 c 704
2005-10-05 05:54:53 C 00 33 27.52 +03 14 05.4 17.9 c 704
2005-10-06 03:41:05 C 00 31 19.82 +02 52 29.1 c 691
2005-10-06 04:16:40 C 00 31 16.09 +02 51 53.4 c 691
2005-10-06 04:41:29 C 00 31 13.47 +02 51 28.7 c 691
2005-10-06 04:58:22 C 00 31 11.64 +02 51 10.6 o 699
2005-10-06 06:04:06 C 00 31 04.58 +02 50 04.0 o 699
2005-10-06 06:36:59 C 00 31 01.12 +02 49 31.1 o 699
2005-10-06 22:35:57 C 00 29 24.27 +02 33 08.5 r 084
2005-10-06 22:39:37 C 00 29 23.89 +02 33 05.4 r 084
2005-10-07 04:53:11 C 00 28 47.03 +02 26 51.8 17.8 c 704
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)