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
1982-04-24 07:11:59 A 16 42 59.58 +00 05 22.6 17.0 805
1982-04-25 04:10:57 A 16 34 22.06 -00 09 02.1 17.0 805
1982-04-25 07:24:13 A 16 33 00.13 -00 11 08.9 805
1982-04-26 06:44:13 A 16 24 29.10 -00 25 38.4 18.0 805
1982-04-26 06:46:12 A 16 24 28.31 -00 25 39.4 18.0 805
1982-04-29 04:21:59 A 16 03 59.27 -01 02 23.5 18.0 805
1982-04-29 04:55:55 A 16 03 49.85 -01 04 58.6 A 801
1982-04-30 04:30:38 A 15 58 11.76 -01 15 36.6 A 801
1982-05-01 05:19:06 A 15 52 51.79 -01 26 04.4 675
1982-05-01 15:16:50 15 50 46.51 -01 28 23.5 260
1982-05-01 16:16:49 15 50 33.23 -01 28 48.9 260
1982-05-02 11:38:05 A 15 46 50.57 -01 38 19.5 675
1982-05-13 07:57:36 A 15 15 21.60 -03 08 11.5 17.0 675
1982-05-14 07:42:36 A 15 13 34.97 -03 15 53.2 675
1982-05-16 09:22:00 A 15 10 14.14 -03 32 01.9 675
1982-05-18 02:12:59 A 15 07 54.81 -03 44 25.6 19.0 805
1982-05-18 02:35:00 A 15 07 53.45 -03 44 32.6 805
1982-05-18 04:39:59 A 15 07 45.10 -03 45 13.3 805
1982-05-18 05:06:59 A 15 07 43.25 -03 45 23.0 805
1982-05-18 06:19:50 A 15 07 38.74 -03 46 49.9 A 801
1982-05-20 02:57:00 A 15 05 27.43 -04 00 33.4 19.0 805
1982-05-20 04:36:00 A 15 05 21.61 -04 01 08.1 805
1982-05-21 03:44:28 A 15 04 21.13 -04 08 48.0 19.0 805
1982-05-21 04:01:59 A 15 04 20.45 -04 08 56.6 805
1982-05-24 04:40:28 A 15 01 39.61 -04 33 35.8 805
1982-05-24 04:55:58 A 15 01 39.76 -04 33 40.1 805
1982-05-27 10:23:51 A 14 59 36.93 -05 00 33.8 474
1982-05-27 11:05:32 A 14 59 35.61 -05 00 49.0 474
1982-05-31 08:27:05 A 14 58 03.81 -05 35 00.3 18.0 675
1982-06-12 05:42:06 A 14 58 34.49 -07 21 46.8 675
1982-06-13 05:12:05 A 14 58 54.15 -07 30 48.2 675
1985-08-14 07:52:33 A 23 52 13.88 +03 19 57.9 B 691
1985-08-14 08:13:33 A 23 52 13.13 +03 19 54.8 B 691
1985-08-14 08:55:52 A 23 52 11.78 +03 19 46.2 B 691
1985-08-15 07:19:29 A 23 51 31.72 +03 15 22.8 B 691
1985-08-15 08:04:50 A 23 51 30.11 +03 15 12.8 B 691
1985-08-15 08:30:21 A 23 51 29.23 +03 15 06.8 B 691
1985-09-15 05:44:33 A 23 01 12.18 -03 06 17.4 A 801
1985-09-23 06:23:11 A 22 43 22.00 -05 33 32.9 675
1985-09-23 06:37:23 A 22 43 20.64 -05 33 43.8 675
1985-09-24 05:46:24 A 22 41 16.89 -05 51 09.7 675
1985-09-24 06:06:00 A 22 41 15.09 -05 51 24.4 675
1985-11-05 06:59:11 A 22 04 37.03 -12 55 19.8 675
1985-11-05 07:10:36 A 22 04 37.29 -12 55 20.8 675
1985-11-06 05:19:59 A 22 05 06.12 -12 56 36.3 675
1985-11-06 05:36:11 A 22 05 06.45 -12 56 36.7 675
1986-04-12 08:47:12 A 19 48 05.77 -10 12 42.3 A 801
1986-04-13 08:50:08 A 19 35 56.01 -10 10 27.2 A 801
1986-04-14 10:29:58 A 19 23 22.63 -10 06 05.6 B 691
1986-04-14 10:45:09 A 19 23 15.03 -10 06 04.2 B 691
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)