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
2017-11-18 08:07:51 C 00 22 37.29 -29 34 27.0 U T08
2017-11-18 08:12:33 C 00 22 35.23 -29 34 55.5 U T08
2017-11-18 08:19:10 C 00 22 32.32 -29 35 35.7 U T08
2017-11-18 08:23:50 C 00 22 30.28 -29 36 03.5 U T08
2017-11-18 08:35:05 C 00 22 25.35 -29 37 11.3 U T08
2017-11-19 12:05:39 C 00 10 50.38 -32 26 24.5 U Q64
2017-11-19 12:08:35 C 00 10 48.95 -32 26 42.6 U Q64
2017-11-19 12:11:29 C 00 10 47.56 -32 27 00.5 U Q64
2017-11-19 12:14:25 C 00 10 46.16 -32 27 18.6 U Q64
2017-11-19 12:17:21 C 00 10 44.75 -32 27 36.6 U Q64
2017-11-19 12:20:17 C 00 10 43.35 -32 27 54.6 U Q64
2017-11-19 12:23:15 C 00 10 41.94 -32 28 12.8 U Q64
2017-11-19 12:26:11 C 00 10 40.53 -32 28 30.9 U Q64
2017-11-19 12:29:06 C 00 10 39.12 -32 28 49.0 U Q64
2017-11-19 12:32:01 C 00 10 37.72 -32 29 06.9 U Q64
2017-11-19 21:47:27 S 00 06 31.680 -33 27 35.46 L C51
2017-11-19 23:21:42 S 00 05 48.022 -33 37 33.24 L C51
2017-11-20 02:30:23 S 00 04 19.685 -33 57 32.83 L C51
2017-11-20 12:05:33 C 23 59 38.25 -34 58 36.1 U Q64
2017-11-20 12:08:33 C 23 59 36.67 -34 58 54.8 U Q64
2017-11-20 12:11:29 C 23 59 35.15 -34 59 12.9 U Q64
2017-11-20 12:14:24 C 23 59 33.59 -34 59 31.2 U Q64
2017-11-20 12:17:19 C 23 59 32.06 -34 59 49.4 U Q64
2017-11-20 12:21:16 C 23 59 29.99 -35 00 13.9 U Q64
2017-11-20 12:24:11 C 23 59 28.46 -35 00 32.2 U Q64
2017-11-20 12:28:06 C 23 59 26.41 -35 00 56.4 U Q64
2017-11-20 12:31:01 C 23 59 24.89 -35 01 14.4 U Q64
2017-11-20 12:33:57 C 23 59 23.34 -35 01 32.7 U Q64
2017-11-22 07:04:04 C 23 36 41.26 -39 35 01.9 U T08
2017-11-22 07:14:01 C 23 36 34.97 -39 36 04.0 U T08
2017-11-22 07:23:56 C 23 36 28.72 -39 37 05.7 U T08
2017-11-22 07:33:53 C 23 36 22.43 -39 38 07.2 U T08
2018-05-18 10:28:41 C 19 50 12.30 -14 15 55.4 U G96
2018-05-18 10:35:34 C 19 50 12.11 -14 15 54.2 U G96
2018-05-18 10:42:27 C 19 50 11.88 -14 15 53.5 U G96
2018-05-18 10:49:19 C 19 50 11.66 -14 15 52.7 U G96
2021-08-16 18:54:45 C 01 51 27.22 +13 19 24.1 q D29
2021-08-16 19:15:08 C 01 51 28.46 +13 19 29.2 q D29
2021-08-16 19:35:30 C 01 51 29.68 +13 19 35.8 q D29
2021-09-01 11:29:49 C 02 14 11.241 +14 47 11.54 U F51
2021-09-01 11:46:24 C 02 14 12.129 +14 47 14.47 U F51
2021-09-01 12:02:59 C 02 14 12.994 +14 47 17.46 U F51
2021-09-06 10:02:16 C 02 20 42.34 +15 04 50.8 V 703
2021-09-06 10:12:45 C 02 20 42.91 +15 04 52.4 V 703
2021-09-06 10:27:55 C 02 20 43.69 +15 04 54.1 V 703
2021-09-07 11:06:55 C 02 22 01.95 +15 07 50.9 V G96
2021-09-07 11:14:57 C 02 22 02.36 +15 07 51.7 V G96
2021-09-07 11:23:00 C 02 22 02.73 +15 07 52.6 V G96
2021-09-07 11:31:03 C 02 22 03.12 +15 07 53.4 V G96
2021-09-10 09:38:43 C 02 25 41.30 +15 14 46.6 V 703
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)