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
2009-11-05 20:02:07 C 23 44 31.92 -09 39 42.1 17.2 o C20
2009-11-05 20:08:28 C 23 44 31.09 -09 39 50.9 17.3 o C20
2009-11-07 03:51:06 C 23 40 42.58 -10 23 52.4 o H47
2009-11-07 03:59:36 C 23 40 41.51 -10 24 04.1 o H47
2009-11-07 04:09:12 C 23 40 40.23 -10 24 18.0 o H47
2009-11-12 03:25:38 C 23 26 48.15 -13 05 11.7 o H47
2009-11-12 03:32:30 C 23 26 47.29 -13 05 21.5 o H47
2009-11-12 03:39:53 C 23 26 46.38 -13 05 30.0 o H47
2009-11-16 00:40:38 C 23 16 33.13 -15 05 01.7 o H23
2009-11-16 01:03:35 C 23 16 30.36 -15 05 30.6 o H23
2009-11-16 01:26:29 C 23 16 27.54 -15 05 59.3 o H23
2009-11-16 19:27:38 C 23 14 30.12 -15 28 39.3 18.2 o C20
2009-11-16 19:31:51 C 23 14 29.67 -15 28 44.2 18.3 o C20
2009-11-17 03:40:14 C 23 13 38.74 -15 38 49.5 r 703
2009-11-17 03:53:17 C 23 13 37.16 -15 39 05.2 r 703
2009-11-17 04:06:16 C 23 13 35.61 -15 39 21.4 r 703
2009-11-18 19:24:15 C 23 09 26.36 -16 27 55.7 18.1 o C20
2009-11-18 19:47:47 C 23 09 23.74 -16 28 23.9 18.0 o C20
2009-11-19 03:25:54 C 23 08 37.12 -16 37 42.3 17.8 c 704
2009-11-19 03:43:44 C 23 08 35.02 -16 38 04.2 18.2 c 704
2009-11-19 04:01:35 C 23 08 32.95 -16 38 25.1 18.5 c 704
2009-11-23 18:57:45 C 22 57 07.85 -18 52 10.8 18.1 o C20
2009-11-23 19:04:07 C 22 57 07.15 -18 52 18.9 18.2 o C20
2009-11-24 18:03:04 C 22 54 46.60 -19 19 46.1 17.9 o C20
2009-11-24 18:09:25 C 22 54 45.89 -19 19 53.6 18.3 o C20
2010-04-10 13:52:05 S 19 24 07.663 -18 16 07.43 L C51
2010-04-10 17:02:36 S 19 24 16.37 -18 15 04.5 L C51
2010-04-10 20:13:07 S 19 24 25.10 -18 14 00.7 L C51
2010-04-10 23:23:38 S 19 24 33.79 -18 12 58.2 L C51
2010-04-11 00:58:59 S 19 24 38.083 -18 12 25.13 L C51
2010-04-11 02:34:09 S 19 24 42.38 -18 11 53.4 L C51
2010-04-11 02:34:20 S 19 24 42.39 -18 11 52.0 L C51
2010-04-11 04:09:30 S 19 24 46.71 -18 11 20.5 L C51
2010-04-11 10:30:32 S 19 25 03.718 -18 09 14.11 L C51
2010-04-11 13:41:03 S 19 25 12.12 -18 08 11.7 L C51
2010-04-11 16:51:35 S 19 25 20.59 -18 07 06.7 L C51
2010-04-11 20:02:06 S 19 25 28.83 -18 06 05.4 L C51
2013-09-02 07:27:20 C 01 49 00.71 +12 58 18.9 N I41
2013-09-02 08:26:53 C 01 49 02.21 +12 58 24.2 q 703
2013-09-02 08:36:30 C 01 49 02.52 +12 58 24.5 q 703
2013-09-02 08:46:14 C 01 49 02.75 +12 58 23.7 q 703
2013-09-02 08:55:53 C 01 49 03.07 +12 58 25.9 q 703
2013-09-02 09:03:03 C 01 49 03.31 +12 58 25.6 N I41
2013-09-02 09:54:57 C 01 49 04.69 +12 58 29.1 N I41
2013-09-04 00:32:43 C 01 50 12.60 +13 00 22.1 o B67
2013-09-04 01:18:29 C 01 50 13.74 +13 00 24.0 o B67
2013-09-04 02:04:15 C 01 50 14.87 +13 00 25.9 o B67
2013-09-04 02:50:01 C 01 50 15.98 +13 00 27.7 o B67
2013-09-04 06:32:37 C 01 50 23.16 +13 00 37.6 N I41
2013-09-04 07:25:07 C 01 50 24.50 +13 00 40.1 N I41
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)