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
2021-10-23 02:13:56 s 1 -173444.76 1 +126842.60 3930.0 C57
2021-10-23 02:43:56 S 02 53 04.982 +08 41 17.38 V C57
2021-10-23 02:43:56 s 1 -173340.12 1 +124381.52 2570.0 C57
2021-10-23 03:13:56 S 02 53 06.096 +08 40 39.07 V C57
2021-10-23 03:13:56 s 1 -173214.95 2 +121905.65 9050.0 C57
2021-10-23 03:23:56 S 02 53 06.370 +08 40 25.82 V C57
2021-10-23 03:23:56 s 1 -173168.59 8 +121077.07 8280.0 C57
2021-10-23 03:43:56 S 02 53 07.118 +08 39 57.82 V C57
2021-10-23 03:43:56 s 1 -173068.84 9 +119414.98 2000.0 C57
2021-10-23 04:23:56 S 02 53 08.400 +08 39 03.02 V C57
2021-10-23 04:23:56 s 1 -172840.76 0 +116071.09 9080.0 C57
2021-10-23 04:53:56 S 02 53 09.487 +08 38 22.70 V C57
2021-10-23 04:53:56 s 1 -172644.17 3 +113545.93 4820.0 C57
2021-10-23 05:03:56 S 02 53 09.874 +08 38 08.63 V C57
2021-10-23 05:03:56 s 1 -172573.69 6 +112700.93 9380.0 C57
2021-10-23 05:13:56 S 02 53 10.310 +08 37 56.32 V C57
2021-10-23 05:13:56 s 1 -172500.71 8 +111854.28 5160.0 C57
2021-10-23 05:23:56 S 02 53 10.637 +08 37 43.18 V C57
2021-10-23 05:23:56 s 1 -172425.22 0 +111006.00 2110.0 C57
2021-10-23 05:33:56 S 02 53 11.040 +08 37 28.02 V C57
2021-10-23 05:33:56 s 1 -172347.18 8 +110156.07 180.0 C57
2021-10-23 05:53:56 S 02 53 11.702 +08 37 04.98 V C57
2021-10-23 05:53:56 s 1 -172183.44 6 +108451.31 9390.0 C57
2021-10-23 06:13:56 S 02 53 12.384 +08 36 35.03 V C57
2021-10-23 06:13:56 s 1 -172009.35 4 +106740.01 2340.0 C57
2021-10-23 06:23:56 S 02 53 12.806 +08 36 21.85 V C57
2021-10-23 06:23:56 s 1 -171918.38 3 +105881.90 5060.0 C57
2021-10-23 06:33:56 S 02 53 13.121 +08 36 08.82 V C57
2021-10-23 06:33:56 s 1 -171824.77 0 +105022.16 8520.0 C57
2021-10-23 06:53:56 S 02 53 14.030 +08 35 43.01 V C57
2021-10-23 06:53:56 s 1 -171629.54 9 +103297.79 7450.0 C57
2021-10-23 07:03:56 S 02 53 14.410 +08 35 27.78 V C57
2021-10-23 07:03:56 s 1 -171527.90 3 +102433.16 2790.0 C57
2021-10-23 21:27:17 C 02 55 10.29 +08 25 44.6 V G17
2021-10-23 21:33:23 C 02 55 10.22 +08 25 36.1 V G17
2021-10-23 21:39:29 C 02 55 10.16 +08 25 28.2 V G17
2021-10-23 21:46:58 C 02 55 09.99 +08 25 11.6 V G33
2021-10-23 21:48:44 C 02 55 09.96 +08 25 09.5 V G33
2021-10-23 21:50:25 C 02 55 09.94 +08 25 07.1 V G33
2021-10-23 21:52:06 C 02 55 09.91 +08 25 04.9 V G33
2021-10-23 21:53:47 C 02 55 09.90 +08 25 02.7 V G33
2021-10-23 21:55:28 C 02 55 09.87 +08 25 00.5 V G33
2021-10-24 11:10:35 C 02 55 06.38 +08 07 05.8 V T05
2021-10-24 11:30:42 C 02 55 05.98 +08 06 37.3 V T05
2021-10-24 11:56:54 C 02 55 05.48 +08 06 00.2 V T05
2021-10-24 12:21:39 C 02 55 05.03 +08 05 24.8 V T05
2021-10-24 20:03:14 C 02 55 06.72 +07 53 53.2 Y 557
2021-10-24 21:04:14 C 02 55 06.01 +07 52 25.6 Y 557
2021-10-24 22:05:13 C 02 55 05.19 +07 50 57.5 Y 557
2021-10-24 23:03:08 C 02 55 04.32 +07 49 33.1 Y 557
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)