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
2021-10-05 04:49:11 C 02 49 24.01 +14 11 11.2 o W92
2021-10-05 04:55:50 C 02 49 24.13 +14 11 09.0 o W92
2021-10-06 02:44:05 C 02 49 56.89 +14 02 16.5 o Z22
2021-10-06 02:50:45 C 02 49 57.01 +14 02 13.9 o Z22
2021-10-07 03:36:16 C 02 50 32.68 +13 51 59.8 o Z22
2021-10-07 03:44:29 C 02 50 32.79 +13 51 56.1 o Z22
2021-10-07 07:23:47 C 02 50 39.29 +13 50 17.4 V G96
2021-10-07 07:31:11 C 02 50 39.40 +13 50 14.3 V G96
2021-10-07 07:38:34 C 02 50 39.52 +13 50 11.2 V G96
2021-10-07 07:45:57 C 02 50 39.63 +13 50 08.1 V G96
2021-10-09 05:39:38 C 02 51 39.94 +13 29 16.9 o W92
2021-10-09 05:46:18 C 02 51 40.02 +13 29 13.1 o W92
2021-10-09 07:35:06 C 02 51 42.79 +13 27 40.0 V 703
2021-10-09 07:43:17 C 02 51 42.88 +13 27 36.0 V 703
2021-10-09 07:51:27 C 02 51 42.99 +13 27 31.9 V 703
2021-10-09 07:59:38 C 02 51 43.07 +13 27 27.8 V 703
2021-10-10 22:11:43 C 02 52 27.40 +13 06 55.7 V B18
2021-10-10 22:16:26 C 02 52 27.44 +13 06 53.0 V B18
2021-10-10 22:21:11 C 02 52 27.49 +13 06 50.3 V B18
2021-10-10 22:25:54 C 02 52 27.53 +13 06 47.4 V B18
2021-10-10 22:44:50 C 02 52 27.72 +13 06 36.8 V B18
2021-10-11 16:24:10 C 02 52 47.29 +12 56 27.9 V D29
2021-10-11 16:44:32 C 02 52 47.45 +12 56 15.9 V D29
2021-10-11 17:04:55 C 02 52 47.61 +12 56 03.8 V D29
2021-10-11 22:55:42 C 02 52 53.15 +12 52 26.3 V B18
2021-10-11 23:00:25 C 02 52 53.19 +12 52 23.5 V B18
2021-10-11 23:05:09 C 02 52 53.23 +12 52 20.7 V B18
2021-10-11 23:09:53 C 02 52 53.27 +12 52 17.7 V B18
2021-10-11 23:14:36 C 02 52 53.30 +12 52 14.8 V B18
2021-10-11 23:19:20 C 02 52 53.35 +12 52 11.9 V B18
2021-10-11 23:24:05 C 02 52 53.38 +12 52 09.1 V B18
2021-10-11 23:28:48 C 02 52 53.42 +12 52 06.2 V B18
2021-10-12 01:45:40 C 02 52 56.70 +12 50 51.8 o Z22
2021-10-12 01:52:20 C 02 52 56.70 +12 50 48.0 o Z22
2021-10-13 01:49:35 C 02 53 19.71 +12 35 38.5 o Z22
2021-10-13 01:56:15 C 02 53 19.76 +12 35 34.2 o Z22
2021-10-13 07:28:19 C 02 53 25.18 +12 31 51.5 V 703
2021-10-13 07:35:54 C 02 53 25.21 +12 31 46.7 V 703
2021-10-13 07:43:29 C 02 53 25.26 +12 31 41.7 V 703
2021-10-13 07:51:04 C 02 53 25.31 +12 31 36.6 V 703
2021-10-13 08:23:56 S 02 53 59.340 +12 40 24.92 V C57
2021-10-13 08:23:56 s 1 +157839.94 0 +42566.838 6990.0 C57
2021-10-13 10:14:40 C 02 53 27.89 +12 30 09.1 V T08
2021-10-13 10:17:20 C 02 53 27.89 +12 30 07.3 V T08
2021-10-13 10:21:19 C 02 53 27.91 +12 30 04.8 V T08
2021-10-13 10:28:37 C 02 53 27.93 +12 30 00.0 V T08
2021-10-13 11:13:56 S 02 53 58.471 +12 39 04.14 V C57
2021-10-13 11:13:56 s 1 +162980.55 9 +58714.955 6240.0 C57
2021-10-13 11:23:56 S 02 53 58.267 +12 39 00.50 V C57
2021-10-13 11:23:56 s 1 +163246.35 0 +59652.708 7300.0 C57
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)