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
2017-10-12 17:37:51 C 02 21 53.64 +10 35 34.4 q D29
2017-10-13 08:28:37 C 02 21 30.17 +10 23 24.8 U 703
2017-10-13 08:35:40 C 02 21 29.91 +10 23 19.0 U 703
2017-10-13 08:42:43 C 02 21 29.62 +10 23 13.2 U 703
2017-10-13 08:49:45 C 02 21 29.37 +10 23 07.1 U 703
2017-10-13 16:34:53 C 02 21 17.22 +10 16 23.6 o C94
2017-10-13 16:38:01 C 02 21 17.13 +10 16 21.1 o C94
2017-10-13 17:40:17 C 02 21 14.83 +10 15 27.6 o C94
2017-10-13 17:42:30 C 02 21 14.76 +10 15 26.3 o C94
2017-10-13 17:44:39 C 02 21 14.71 +10 15 24.6 o C94
2017-10-15 08:13:12 C 02 20 01.77 +09 41 05.6 U G96
2017-10-15 08:20:41 C 02 20 01.43 +09 40 58.5 U G96
2017-10-15 08:28:14 C 02 20 01.09 +09 40 51.3 U G96
2017-10-15 08:35:43 C 02 20 00.75 +09 40 44.2 U G96
2017-10-16 07:10:41 C 02 19 12.93 +09 18 53.3 U 703
2017-10-16 07:20:16 C 02 19 12.47 +09 18 43.8 U 703
2017-10-16 07:27:58 C 02 19 12.09 +09 18 36.2 U 703
2017-10-16 07:35:40 C 02 19 11.71 +09 18 28.6 U 703
2017-10-19 02:15:27 C 02 16 22.67 +08 06 20.7 q W33
2017-10-19 02:37:20 C 02 16 21.46 +08 05 55.6 q W33
2017-10-19 02:59:18 C 02 16 20.26 +08 05 29.7 q W33
2017-10-19 03:50:56 C 02 16 16.79 +08 05 17.3 q W98
2017-10-19 04:01:06 C 02 16 16.16 +08 05 05.6 q W98
2017-10-19 04:11:17 C 02 16 15.53 +08 04 53.5 q W98
2017-10-19 07:48:21 C 02 16 04.38 +07 59 52.6 U 703
2017-10-19 07:59:08 C 02 16 03.73 +07 59 39.8 U 703
2017-10-19 08:10:02 C 02 16 03.09 +07 59 26.8 U 703
2017-10-19 08:20:56 C 02 16 02.40 +07 59 13.9 U 703
2017-10-21 08:08:12 C 02 13 30.73 +06 59 06.6 U 703
2017-10-21 08:16:06 C 02 13 30.17 +06 58 55.8 U 703
2017-10-21 08:24:02 C 02 13 29.62 +06 58 45.3 U 703
2017-10-21 08:26:20 C 02 13 29.44 +06 58 42.8 t 857
2017-10-21 08:32:01 C 02 13 29.07 +06 58 34.7 U 703
2017-10-21 08:42:13 C 02 13 28.33 +06 58 21.5 t 857
2017-10-21 08:59:53 C 02 13 27.11 +06 57 57.9 t 857
2017-10-22 10:05:38 C 02 11 59.23 +06 23 39.3 T08
2017-10-22 10:17:45 C 02 11 58.32 +06 23 22.2 T08
2017-10-22 10:30:22 C 02 11 57.36 +06 23 04.3 T08
2017-10-22 10:41:54 C 02 11 56.47 +06 22 48.0 T08
2017-10-24 06:47:23 C 02 09 03.31 +05 16 43.2 U 703
2017-10-24 06:55:21 C 02 09 02.65 +05 16 31.2 U 703
2017-10-24 07:03:22 C 02 09 01.97 +05 16 18.3 U 703
2017-10-24 07:11:23 C 02 09 01.30 +05 16 05.6 U 703
2017-10-24 07:14:17 C 02 09 01.06 +05 16 01.0 U G96
2017-10-24 07:21:44 C 02 09 00.44 +05 15 49.3 U G96
2017-10-24 07:29:12 C 02 08 59.80 +05 15 37.5 U G96
2017-10-24 07:36:40 C 02 08 59.18 +05 15 25.8 U G96
2017-10-25 02:29:17 C 02 07 39.76 +04 45 52.5 q W98
2017-10-25 02:39:27 C 02 07 38.88 +04 45 36.0 q W98
2017-10-25 02:49:37 C 02 07 37.99 +04 45 19.2 q W98
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)