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
2021-10-31 07:17:57 C 02 53 25.35 +03 04 41.6 V 703
2021-10-31 07:25:37 C 02 53 25.05 +03 04 23.4 V 703
2021-10-31 07:33:17 C 02 53 24.78 +03 04 05.3 V 703
2021-10-31 07:40:57 C 02 53 24.41 +03 03 47.1 V 703
2021-10-31 07:41:35 C 02 53 24.46 +03 03 46.7 V 703
2021-10-31 07:49:08 C 02 53 24.16 +03 03 27.4 V 703
2021-10-31 07:56:42 C 02 53 23.87 +03 03 09.5 V 703
2021-10-31 08:04:15 C 02 53 23.59 +03 02 51.8 V 703
2021-10-31 11:35:52 C 02 53 18.94 +02 54 39.7 V T05
2021-10-31 11:41:21 C 02 53 18.72 +02 54 26.6 V T05
2021-10-31 11:50:02 C 02 53 18.38 +02 54 05.6 V T05
2021-10-31 12:09:01 C 02 53 17.63 +02 53 19.8 V T05
2021-11-01 21:58:55 C 02 52 38.68 +01 26 08.3 q G33
2021-11-01 22:00:31 C 02 52 38.62 +01 26 04.0 q G33
2021-11-01 22:02:17 C 02 52 38.56 +01 25 59.2 q G33
2021-11-01 22:03:58 C 02 52 38.50 +01 25 54.7 q G33
2021-11-01 22:05:39 C 02 52 38.43 +01 25 50.1 q G33
2021-11-01 22:07:22 C 02 52 38.37 +01 25 45.5 q G33
2021-11-02 06:20:51 C 02 52 27.36 +01 03 25.7 U I41
2021-11-02 06:21:31 C 02 52 27.33 +01 03 23.8 U I41
2021-11-02 08:03:59 C 02 52 22.77 +00 58 36.5 U I41
2021-11-02 08:35:07 C 02 52 21.37 +00 57 08.7 U I41
2021-11-02 10:30:25 C 02 52 19.38 +00 52 01.5 V T08
2021-11-02 10:37:47 C 02 52 19.02 +00 51 40.4 V T08
2021-11-02 10:43:46 C 02 52 18.73 +00 51 23.6 V T08
2021-11-02 11:29:34 C 02 52 16.53 +00 49 13.2 V T08
2021-11-03 14:28:43 C 02 51 35.62 -00 31 55.6 q Q21
2021-11-03 14:36:16 C 02 51 35.26 -00 32 19.4 q Q21
2021-11-04 07:27:19 C 02 51 05.25 -01 26 58.6 V 703
2021-11-04 07:34:47 C 02 51 04.85 -01 27 23.7 V 703
2021-11-04 07:43:41 C 02 51 04.37 -01 27 53.5 V 703
2021-11-04 07:51:09 C 02 51 03.96 -01 28 18.6 V 703
2021-11-04 10:47:37 C 02 50 58.55 -01 37 57.3 V T05
2021-11-04 10:51:37 C 02 50 58.32 -01 38 10.8 V T05
2021-11-04 11:00:17 C 02 50 57.83 -01 38 40.3 V T05
2021-11-04 11:50:30 C 02 50 55.00 -01 41 31.0 V T05
2021-11-05 06:08:38 C 02 50 23.55 -02 46 28.2 U I41
2021-11-05 06:09:59 C 02 50 23.47 -02 46 33.2 U I41
2021-11-05 08:05:01 C 02 50 16.78 -02 53 36.1 U I41
2021-11-05 08:06:21 C 02 50 16.70 -02 53 41.1 U I41
2021-11-06 10:30:06 C 02 49 18.67 -04 35 57.2 V T08
2021-11-06 11:21:10 C 02 49 15.21 -04 39 26.5 V T08
2021-11-06 12:02:12 C 02 49 12.49 -04 42 14.9 V T08
2021-11-06 12:37:51 C 02 49 10.20 -04 44 41.4 V T08
2021-11-08 07:03:57 C 02 47 20.11 -07 56 58.7 Z W33
2021-11-08 07:11:37 C 02 47 22.60 -07 57 34.3 V 703
2021-11-08 07:15:25 C 02 47 19.27 -07 57 54.9 Z W33
2021-11-08 07:17:38 C 02 47 22.13 -07 58 04.0 V 703
2021-11-08 07:23:40 C 02 47 21.68 -07 58 33.6 V 703
2021-11-08 07:26:49 C 02 47 18.45 -07 58 51.0 Z W33
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)