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
2017-10-25 19:15:40 C 02 06 24.23 +04 16 31.6 u 557
2017-10-25 19:47:02 C 02 06 21.59 +04 15 38.2 u 557
2017-10-25 20:14:14 C 02 06 19.25 +04 14 51.5 u 557
2017-10-25 20:45:36 C 02 06 16.56 +04 13 58.2 u 557
2017-10-25 22:40:25 C 02 06 06.64 +04 10 44.2 U 160
2017-10-25 22:42:25 C 02 06 06.46 +04 10 41.3 U 160
2017-10-25 22:44:26 C 02 06 06.28 +04 10 38.0 U 160
2017-10-26 07:29:12 C 02 05 24.43 +03 55 30.6 U 703
2017-10-26 07:37:05 C 02 05 23.69 +03 55 16.8 U 703
2017-10-26 07:44:58 C 02 05 22.94 +03 55 02.7 U 703
2017-10-26 07:52:50 C 02 05 22.20 +03 54 48.9 U 703
2017-10-27 19:56:14 C 02 02 24.66 +02 48 09.4 q 006
2017-10-27 20:00:14 C 02 02 24.25 +02 48 01.7 q 006
2017-10-27 20:04:14 C 02 02 23.88 +02 47 54.6 q 006
2017-10-27 20:07:34 C 02 02 23.55 +02 47 48.0 q 006
2017-10-27 20:10:54 C 02 02 23.20 +02 47 41.3 q 006
2017-10-27 20:14:14 C 02 02 22.93 +02 47 34.6 q 006
2017-10-28 09:42:48 C 02 01 08.79 +02 21 33.7 T05
2017-10-28 09:54:06 C 02 01 07.56 +02 21 11.3 T05
2017-10-28 10:05:02 C 02 01 06.38 +02 20 49.4 T05
2017-10-28 10:16:59 C 02 01 05.09 +02 20 25.7 T05
2017-10-28 19:55:51 C 02 00 14.23 +02 01 57.5 o K95
2017-10-28 19:58:07 C 02 00 14.00 +02 01 53.0 o K95
2017-10-29 03:35:29 C 01 59 31.87 +01 45 02.7 U 703
2017-10-29 03:43:22 C 01 59 31.05 +01 44 46.4 U 703
2017-10-29 03:51:11 C 01 59 30.21 +01 44 30.1 U 703
2017-10-29 04:01:43 C 01 59 29.09 +01 44 08.2 U 703
2017-10-29 19:41:38 C 01 57 58.30 +01 10 50.9 q 006
2017-10-29 19:44:02 C 01 57 58.02 +01 10 45.9 q 006
2017-10-29 19:46:26 C 01 57 57.79 +01 10 40.9 q 006
2017-10-29 19:48:50 C 01 57 57.53 +01 10 36.0 q 006
2017-10-29 19:51:50 C 01 57 57.16 +01 10 29.3 q 006
2017-10-29 19:54:14 C 01 57 56.94 +01 10 24.1 q 006
2017-10-29 19:56:38 C 01 57 56.69 +01 10 18.7 q 006
2017-10-30 09:15:56 C 01 56 34.28 +00 41 30.2 U T08
2017-10-30 09:27:52 C 01 56 32.84 +00 41 03.6 U T08
2017-10-30 09:39:25 C 01 56 31.44 +00 40 37.9 U T08
2017-10-30 09:50:25 C 01 56 30.10 +00 40 13.4 U T08
2017-10-30 19:16:50 C 01 55 33.72 +00 18 26.4 u 557
2017-10-30 19:46:29 C 01 55 30.33 +00 17 18.6 u 557
2017-10-30 20:15:46 C 01 55 26.94 +00 16 11.7 u 557
2017-10-30 20:45:27 C 01 55 23.47 +00 15 04.0 u 557
2017-10-30 21:15:42 C 01 55 19.91 +00 13 54.6 u 557
2017-10-30 21:45:00 C 01 55 16.45 +00 12 47.5 u 557
2017-10-31 17:55:45 C 01 53 06.62 -00 34 12.4 q C97
2017-10-31 17:57:46 C 01 53 06.36 -00 34 16.9 q C97
2017-10-31 18:01:47 C 01 53 05.85 -00 34 26.6 q C97
2017-10-31 18:03:55 C 01 53 05.57 -00 34 31.8 q C97
2017-11-05 09:26:09 C 01 38 46.16 -05 42 15.9 U T05
2017-11-05 09:46:37 C 01 38 42.66 -05 43 20.5 U T05
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)