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
1986-04-14 10:52:30 A 19 23 11.21 -10 06 03.1 B 691
1986-04-15 10:58:02 A 19 11 46.11 -10 00 51.0 B 691
1986-04-15 11:08:53 A 19 11 40.67 -10 00 49.5 B 691
1986-05-01 13:09:00 A 17 00 48.39 -07 47 42.7 568
1986-05-02 11:24:00 A 16 55 44.27 -07 41 26.0 568
1986-05-02 11:54:29 A 16 55 36.82 -07 41 18.2 568
1986-05-05 08:26:00 A 16 41 05.10 -07 23 32.1 805
1986-05-06 06:18:00 A 16 36 51.54 -07 19 01.2 805
1986-05-10 06:49:29 A 16 19 57.10 -07 04 55.8 A 801
1986-05-13 09:49:11 A 16 08 46.98 -06 57 59.9 B 691
1986-05-13 10:04:45 A 16 08 44.64 -06 57 58.8 B 691
1986-05-13 10:17:36 A 16 08 42.70 -06 57 58.0 B 691
1990-04-24 07:38:11 A 18 27 52.18 -13 10 34.7 801
1990-04-24 07:43:39 A 18 27 51.24 -13 10 32.9 801
1990-05-25 06:31:13 A 16 29 56.33 -09 55 47.5 801
1990-05-25 06:51:31 A 16 29 53.76 -09 55 46.3 801
1993-09-14 09:05:25 23 45 58.40 +01 17 40.6 711
1993-09-15 06:10:30 23 44 10.30 +01 02 29.8 711
1997-08-30 09:12:55 C 00 31 34.45 +06 32 23.0 z 711
1997-08-30 09:31:57 C 00 31 33.86 +06 32 18.6 z 711
1997-08-31 09:22:01 C 00 30 46.13 +06 25 36.0 z 711
1997-08-31 09:41:01 C 00 30 45.38 +06 25 30.2 z 711
1997-09-11 10:37:07 C 00 17 27.70 +04 33 10.9 c 608
1997-09-11 11:54:47 C 00 17 22.23 +04 32 27.9 c 608
1997-09-12 10:37:31 C 00 15 51.26 +04 19 26.7 c 608
1997-09-12 10:41:41 C 00 15 51.00 +04 19 24.8 c 608
1997-09-12 11:57:11 C 00 15 45.37 +04 18 40.3 c 608
1997-09-12 12:04:46 C 00 15 44.79 +04 18 35.6 c 608
1997-09-12 22:58:49 C 00 15 00.14 +04 12 00.3 z 046
1997-09-12 23:04:52 C 00 14 59.71 +04 11 56.8 z 046
1997-09-12 23:10:20 C 00 14 59.28 +04 11 53.1 z 046
1997-09-19 07:38:45 C 00 03 07.62 +02 29 09.5 658
1997-09-19 07:43:38 C 00 03 07.22 +02 29 05.1 658
1997-09-19 07:48:44 C 00 03 06.82 +02 29 02.1 658
1997-09-28 13:21:59 C 23 42 22.76 -00 35 19.4 360
1997-09-28 13:29:29 C 23 42 21.95 -00 35 26.0 360
1997-10-31 04:09:40 C 22 40 35.77 -10 44 09.6 z 711
1997-11-01 04:29:16 C 22 39 44.26 -10 55 31.7 z 711
1997-11-01 04:44:09 C 22 39 43.69 -10 55 38.3 z 711
1998-06-04 22:29:33 C 17 29 18.84 -12 58 40.4 046
1998-06-04 22:31:03 C 17 29 18.71 -12 58 39.9 046
1998-06-04 22:32:39 C 17 29 18.59 -12 58 40.0 046
1998-06-26 06:15:20 C 16 43 21.08 -13 26 29.5 z 711
1998-06-26 06:34:13 C 16 43 19.85 -13 26 32.1 z 711
1998-06-27 06:05:38 C 16 42 02.59 -13 29 42.9 z 711
1998-06-27 06:24:37 C 16 42 01.47 -13 29 45.6 z 711
2001-08-27 08:56:55 C 00 53 01.69 +08 33 10.2 19.9 c 644
2001-08-27 09:12:10 C 00 53 01.50 +08 33 08.8 19.4 c 644
2001-08-27 09:29:49 C 00 53 01.28 +08 33 07.0 19.9 c 644
2001-09-11 06:56:02 C 00 43 23.71 +06 59 07.4 c 699
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)