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
2017-11-05 09:56:12 C 01 38 41.03 -05 43 50.6 U T05
2017-11-06 09:11:33 C 01 35 08.695 -06 59 26.72 L F51
2017-11-06 09:32:52 C 01 35 04.817 -07 00 37.96 L F51
2017-11-06 09:54:13 C 01 35 00.941 -07 01 49.27 L F51
2017-11-07 09:02:22 C 01 31 15.59 -08 21 32.3 U T08
2017-11-07 09:10:41 C 01 31 13.98 -08 22 01.8 U T08
2017-11-07 09:14:04 C 01 31 13.32 -08 22 13.8 U T08
2017-11-07 09:22:26 C 01 31 11.70 -08 22 43.4 U T08
2017-11-07 09:25:57 C 01 31 11.02 -08 22 56.0 U T08
2017-11-07 09:34:14 C 01 31 09.42 -08 23 25.3 U T08
2017-11-07 09:37:41 C 01 31 08.75 -08 23 37.3 U T08
2017-11-07 09:45:56 C 01 31 07.15 -08 24 06.5 U T08
2017-11-09 09:04:01 C 01 22 35.47 -11 22 09.0 U T05
2017-11-09 09:15:52 C 01 22 32.86 -11 22 56.0 U T05
2017-11-09 09:27:41 C 01 22 30.25 -11 23 42.9 U T05
2017-11-09 09:39:34 C 01 22 27.64 -11 24 30.0 U T05
2017-11-10 08:44:25 C 01 17 51.52 -12 59 06.9 U T08
2017-11-10 08:55:40 C 01 17 48.86 -12 59 54.4 U T08
2017-11-10 09:06:56 C 01 17 46.21 -13 00 41.5 U T08
2017-11-10 09:18:11 C 01 17 43.56 -13 01 28.9 U T08
2017-11-10 16:23:57 C 01 16 18.43 -13 31 46.8 q C97
2017-11-10 16:26:07 C 01 16 17.98 -13 31 55.9 q C97
2017-11-10 16:28:18 C 01 16 17.43 -13 32 04.8 q C97
2017-11-14 01:39:18 C 00 56 39.61 -19 54 57.4 q W46
2017-11-14 01:41:55 C 00 56 38.81 -19 55 10.7 q W46
2017-11-14 01:45:35 C 00 56 37.72 -19 55 29.5 q W46
2017-11-14 08:10:20 C 00 54 48.25 -20 28 20.0 U T08
2017-11-14 08:21:36 C 00 54 44.71 -20 29 18.4 U T08
2017-11-14 08:32:53 C 00 54 41.15 -20 30 17.0 U T08
2017-11-14 08:44:10 C 00 54 37.61 -20 31 15.2 U T08
2017-11-16 04:52:24 C 00 41 12.60 -24 32 01.1 U 703
2017-11-16 05:00:19 C 00 41 09.80 -24 32 44.5 U 703
2017-11-16 05:08:14 C 00 41 06.86 -24 33 30.5 U 703
2017-11-16 05:16:09 C 00 41 04.00 -24 34 15.1 U 703
2017-11-17 00:03:21 C 00 34 45.89 -26 22 30.7 q W33
2017-11-17 00:35:16 C 00 34 33.68 -26 25 40.9 q W33
2017-11-17 01:07:17 C 00 34 21.34 -26 28 51.1 q W33
2017-11-17 04:35:39 C 00 32 58.84 -26 47 04.7 U W85
2017-11-17 04:38:33 C 00 32 57.73 -26 47 21.3 U W85
2017-11-17 04:41:27 C 00 32 56.62 -26 47 37.9 U W85
2017-11-17 04:44:20 C 00 32 55.51 -26 47 54.5 U W85
2017-11-17 04:47:14 C 00 32 54.40 -26 48 11.1 U W85
2017-11-17 04:50:07 C 00 32 53.30 -26 48 27.5 U W85
2017-11-17 04:53:01 C 00 32 52.19 -26 48 44.2 U W85
2017-11-17 04:55:56 C 00 32 51.08 -26 49 01.0 U W85
2017-11-17 04:58:51 C 00 32 49.96 -26 49 17.7 U W85
2017-11-17 05:01:44 C 00 32 48.86 -26 49 34.2 U W85
2017-11-18 07:45:18 C 00 22 47.16 -29 32 10.9 U T08
2017-11-18 07:56:38 C 00 22 42.20 -29 33 19.4 U T08
2017-11-18 08:01:14 C 00 22 40.17 -29 33 47.4 U T08
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)