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
2021-11-08 07:29:42 C 02 47 21.20 -07 59 03.7 V 703
2021-11-08 09:19:18 C 02 47 18.13 -08 07 48.3 V T05
2021-11-08 09:23:54 C 02 47 17.75 -08 08 11.3 V T05
2021-11-08 09:27:51 C 02 47 17.44 -08 08 31.1 V T05
2021-11-08 09:54:46 C 02 47 15.25 -08 10 45.7 V T05
2021-11-09 21:57:23 C 02 45 20.84 -11 26 57.4 V L65
2021-11-09 22:13:07 C 02 45 19.58 -11 28 30.1 V L65
2021-11-09 22:29:21 C 02 45 18.25 -11 30 05.9 V L65
2021-11-10 09:41:38 C 02 44 37.45 -12 36 54.5 V T08
2021-11-10 09:49:37 C 02 44 36.65 -12 37 44.4 V T08
2021-11-10 09:56:19 C 02 44 35.99 -12 38 25.8 V T08
2021-11-10 10:11:41 C 02 44 34.45 -12 40 01.0 V T08
2021-11-11 05:42:24 C 02 43 20.74 -14 47 11.3 V 703
2021-11-11 05:50:11 C 02 43 19.93 -14 48 04.5 V 703
2021-11-11 05:57:57 C 02 43 19.12 -14 48 57.5 V 703
2021-11-11 06:05:43 C 02 43 18.31 -14 49 50.8 V 703
2021-11-11 07:16:39 C 02 43 17.51 -14 57 27.0 V T05
2021-11-11 07:53:01 C 02 43 13.77 -15 01 39.5 V T05
2021-11-11 07:57:05 C 02 43 13.34 -15 02 07.7 V T05
2021-11-11 08:05:04 C 02 43 12.50 -15 03 03.1 V T05
2021-11-11 20:07:18 C 02 42 15.04 -16 28 23.6 q M47
2021-11-11 20:11:04 C 02 42 14.60 -16 28 51.4 q M47
2021-11-11 20:14:48 C 02 42 14.18 -16 29 18.4 q M47
2021-11-11 20:18:35 C 02 42 13.74 -16 29 46.0 q M47
2021-11-12 04:35:41 C 02 41 41.64 -17 31 28.4 V G96
2021-11-12 04:43:07 C 02 41 40.82 -17 32 25.3 V G96
2021-11-12 04:50:34 C 02 41 39.98 -17 33 22.4 V G96
2021-11-12 04:58:01 C 02 41 39.14 -17 34 19.3 V G96
2021-11-13 08:46:34 C 02 39 13.64 -21 19 52.4 V T08
2021-11-13 08:49:13 C 02 39 13.26 -21 20 15.4 V T08
2021-11-13 08:53:51 C 02 39 12.63 -21 20 56.1 V T08
2021-11-13 09:02:28 C 02 39 11.40 -21 22 11.4 V T08
2021-11-17 09:39:47 C 02 25 39.17 -39 05 33.7 V T08
2021-11-17 09:45:05 C 02 25 37.68 -39 06 44.9 V T08
2021-11-17 09:54:22 C 02 25 35.10 -39 08 49.7 V T08
2021-11-17 10:45:19 C 02 25 20.97 -39 20 10.9 V T08
2021-11-20 01:22:39 C 02 06 02.32 -55 01 30.2 q 834
2021-11-20 01:43:54 C 02 05 50.47 -55 07 18.8 q 834
2021-11-20 11:32:49 S 02 00 57.077 -57 46 17.15 L C51
2021-11-22 02:42:31 C 01 29 17.30 -68 35 04.7 V W88
2021-11-22 02:50:40 C 01 29 06.30 -68 37 16.2 V W88
2021-11-22 02:59:01 C 01 28 55.08 -68 39 30.0 V W88
2021-11-25 01:25:22 C 21 04 24.78 -82 10 03.1 V W88
2021-11-25 01:38:29 C 21 02 44.87 -82 10 04.7 V W88
2022-02-10 07:59:19 C 17 15 43.34 -24 38 25.0 t W88
2022-02-10 08:25:47 C 17 15 46.66 -24 38 22.9 t W88
2022-02-10 09:06:08 C 17 15 50.82 -24 38 14.2 t W88
2022-06-04 00:36:24 C 19 39 32.91 -13 39 58.9 X C95
2022-06-04 01:02:48 C 19 39 31.02 -13 39 58.8 X C95
2025-07-03 14:02:19 C 00 41 07.052 +06 43 28.55 X F52
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)