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
2013-10-13 19:10:41 C 01 34 42.64 +06 40 29.4 q G34
2013-10-13 19:32:06 C 01 34 40.87 +06 40 06.8 q G34
2013-10-14 02:56:26 C 01 34 03.52 +06 32 20.9 G40
2013-10-14 02:57:25 C 01 34 03.41 +06 32 19.9 G40
2013-10-14 03:11:51 C 01 34 02.11 +06 32 03.7 G40
2013-10-14 03:12:52 C 01 34 02.04 +06 32 01.7 G40
2013-10-14 03:26:45 C 01 34 00.84 +06 31 47.3 G40
2013-10-14 03:27:44 C 01 34 00.76 +06 31 45.9 G40
2013-10-14 05:45:28 C 01 33 49.49 +06 29 48.7 r Y00
2013-10-14 05:49:31 C 01 33 49.08 +06 29 44.2 r Y00
2013-10-14 05:53:00 C 01 33 48.81 +06 29 40.3 r Y00
2013-10-14 23:06:26 C 01 32 28.02 +06 09 59.8 t G40
2013-10-14 23:07:28 C 01 32 27.92 +06 09 58.8 t G40
2013-10-14 23:31:47 C 01 32 25.69 +06 09 31.5 t G40
2013-10-14 23:32:45 C 01 32 25.57 +06 09 29.9 t G40
2013-10-15 00:01:30 C 01 32 22.93 +06 08 57.5 t G40
2013-10-15 00:02:27 C 01 32 22.88 +06 08 56.6 t G40
2013-10-15 01:40:13 C 01 32 13.02 +06 06 54.5 o B67
2013-10-15 02:11:17 C 01 32 10.23 +06 06 19.3 o B67
2013-10-15 02:43:32 C 01 32 07.38 +06 05 42.1 o B67
2013-10-15 05:26:01 C 01 31 55.20 +06 02 43.4 w I51
2013-10-15 06:26:15 C 01 31 49.59 +06 01 34.6 w I51
2013-10-15 07:09:02 C 01 31 45.70 +06 00 45.2 w I51
2013-10-21 04:30:55 C 01 18 19.65 +02 57 55.9 q H45
2013-10-21 04:32:46 C 01 18 19.41 +02 57 53.0 q H45
2013-10-21 04:34:30 C 01 18 19.18 +02 57 50.8 q H45
2013-10-21 04:36:05 C 01 18 18.99 +02 57 48.3 q H45
2013-10-21 04:37:47 C 01 18 18.79 +02 57 45.8 q H45
2013-10-21 04:40:50 C 01 18 18.44 +02 57 41.5 q H45
2013-10-22 09:09:57 C 01 15 11.490 +02 15 47.87 L F51
2013-10-22 09:26:45 C 01 15 09.395 +02 15 22.73 L F51
2013-10-22 10:05:00 C 01 15 04.608 +02 14 24.92 L F51
2013-10-24 00:43:44 C 01 10 39.46 +01 15 01.2 r Y00
2013-10-24 00:46:21 C 01 10 39.08 +01 14 56.7 r Y00
2013-10-24 00:49:17 C 01 10 38.66 +01 14 51.9 r Y00
2013-10-24 06:21:11 C 01 09 58.72 +01 05 15.8 N I41
2013-10-24 07:03:38 C 01 09 53.14 +01 04 07.8 N I41
2013-10-24 07:44:13 C 01 09 47.83 +01 03 02.5 N I41
2013-10-24 19:51:00 C 01 08 22.52 +00 43 15.1 o B67
2013-10-24 20:28:00 C 01 08 17.69 +00 42 13.9 o B67
2013-10-24 21:04:20 C 01 08 12.92 +00 41 13.8 o B67
2013-10-25 00:39:44 C 01 07 47.03 +00 36 15.3 r Y00
2013-10-25 00:42:02 C 01 07 46.71 +00 36 11.3 r Y00
2013-10-25 00:44:18 C 01 07 46.37 +00 36 07.4 r Y00
2013-10-25 02:23:15 C 01 07 35.42 +00 32 42.9 i G41
2013-10-25 02:35:00 C 01 07 33.85 +00 32 22.6 i G41
2013-10-25 02:58:43 C 01 07 30.71 +00 31 44.1 i G41
2013-10-25 04:31:13 C 01 07 18.08 +00 29 06.1 q H45
2013-10-25 04:32:58 C 01 07 17.85 +00 29 03.3 q H45
2013-10-25 04:34:15 C 01 07 17.67 +00 29 01.1 q H45
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)