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
2001-10-15 03:50:57 C 23 32 35.35 -04 08 32.2 18.4 c 704
2001-10-15 04:14:06 C 23 32 32.88 -04 08 55.6 18.4 c 704
2001-10-15 04:36:24 C 23 32 30.44 -04 09 18.1 18.7 c 704
2001-10-15 05:21:14 C 23 32 25.60 -04 10 02.7 18.7 c 704
2001-10-17 03:49:08 C 23 27 48.93 -04 55 56.5 18.1 c 644
2001-10-17 04:19:10 C 23 27 45.80 -04 56 25.8 17.8 c 644
2001-10-17 04:49:19 C 23 27 42.63 -04 56 55.4 18.2 c 644
2001-10-17 08:42:10 C 23 27 18.31 -05 00 41.7 18.5 c 644
2001-10-17 09:12:34 C 23 27 15.23 -05 01 10.8 18.1 c 644
2001-10-17 09:44:53 C 23 27 11.94 -05 01 42.3 18.2 c 644
2001-10-23 02:23:53 C 23 14 43.00 -07 08 35.0 18.1 c 704
2001-10-23 02:47:51 C 23 14 40.81 -07 08 56.1 18.5 c 704
2001-10-23 03:13:10 C 23 14 38.54 -07 09 18.4 18.4 c 704
2001-10-23 03:37:03 C 23 14 36.30 -07 09 39.1 18.2 c 704
2001-10-23 04:01:00 C 23 14 34.10 -07 10 00.5 18.2 c 704
2001-10-23 04:35:47 C 23 14 31.07 -07 10 31.3 c 699
2001-10-23 05:09:39 C 23 14 27.97 -07 11 01.4 c 699
2001-10-23 05:43:22 C 23 14 24.81 -07 11 31.1 c 699
2001-10-23 06:17:08 C 23 14 21.70 -07 12 00.5 c 699
2001-10-24 02:02:30 C 23 12 44.55 -07 29 04.9 17.7 c 704
2001-10-24 02:26:30 C 23 12 42.41 -07 29 25.8 17.9 c 704
2001-10-24 02:51:01 C 23 12 40.25 -07 29 46.5 17.9 c 704
2001-10-24 03:14:55 C 23 12 38.10 -07 30 06.8 18.4 c 704
2001-10-24 03:38:48 C 23 12 35.96 -07 30 27.7 17.8 c 704
2001-10-31 07:16:34 C 23 00 13.94 -09 43 50.5 t 644
2001-10-31 07:47:03 C 23 00 11.93 -09 44 11.1 t 644
2001-11-07 02:09:19 C 22 51 56.11 -11 24 52.7 18.9 c 704
2001-11-07 02:29:04 C 22 51 55.11 -11 25 01.9 18.9 c 704
2001-11-07 02:49:00 C 22 51 54.05 -11 25 12.3 18.7 c 704
2001-11-07 03:08:40 C 22 51 53.19 -11 25 23.8 19.1 c 704
2002-06-05 07:13:41 C 18 02 27.40 -13 39 06.2 18.3 c 704
2002-06-05 07:52:45 C 18 02 22.60 -13 39 05.1 18.4 c 704
2002-06-05 08:11:53 C 18 02 20.21 -13 39 05.7 18.7 c 704
2002-06-06 08:39:27 C 17 59 27.57 -13 38 49.7 18.4 c 704
2002-06-06 08:58:41 C 17 59 25.27 -13 38 48.8 19.6 c 704
2002-06-06 09:17:49 C 17 59 22.97 -13 38 49.2 19.4 c 704
2002-06-27 06:39:29 C 17 09 21.95 -14 07 22.8 t 644
2002-06-27 08:21:33 C 17 09 14.05 -14 07 34.4 t 644
2002-07-15 04:52:50 C 16 50 03.87 -15 15 32.8 c 711
2002-07-15 05:04:25 C 16 50 03.40 -15 15 33.6 c 711
2002-07-15 05:16:51 C 16 50 03.25 -15 15 36.3 c 711
2005-09-02 11:13:24 C 01 12 34.42 +10 02 32.6 t 608
2005-09-02 11:28:15 C 01 12 34.28 +10 02 29.3 t 608
2005-09-02 11:43:46 C 01 12 34.13 +10 02 25.8 t 608
2005-09-11 07:01:35 C 01 09 24.42 +09 18 50.0 19.6 c 704
2005-09-11 07:18:14 C 01 09 24.06 +09 18 45.3 19.8 c 704
2005-09-11 07:34:57 C 01 09 23.50 +09 18 39.1 19.9 c 704
2005-09-11 07:51:24 C 01 09 23.08 +09 18 35.4 20.1 c 704
2005-09-15 07:15:58 C 01 06 18.64 +08 44 56.0 r 703
2005-09-15 07:27:38 C 01 06 18.18 +08 44 51.7 r 703
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)