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
2021-10-29 08:43:56 S 02 52 07.145 +04 59 06.32 V C57
2021-10-29 08:43:56 s 1 +112761.60 5 +325909.08 4300.0 C57
2021-10-29 08:53:56 S 02 52 06.605 +04 58 44.62 V C57
2021-10-29 08:53:56 s 1 +112451.09 4 +326230.39 5580.0 C57
2021-10-29 09:03:56 S 02 52 06.014 +04 58 22.84 V C57
2021-10-29 09:03:56 s 1 +112140.20 3 +326550.57 5630.0 C57
2021-10-29 09:13:56 S 02 52 05.558 +04 58 00.88 V C57
2021-10-29 09:13:56 s 1 +111828.93 3 +326869.62 4470.0 C57
2021-10-29 09:23:56 S 02 52 05.064 +04 57 39.13 V C57
2021-10-29 09:23:56 s 1 +111517.28 6 +327187.55 2100.0 C57
2021-10-29 09:33:56 S 02 52 04.579 +04 57 17.14 V C57
2021-10-29 09:33:56 s 1 +111205.26 3 +327504.34 8520.0 C57
2021-10-29 09:43:56 S 02 52 03.994 +04 56 55.10 V C57
2021-10-29 09:43:56 s 1 +110892.86 7 +327820.01 3740.0 C57
2021-10-29 09:53:56 S 02 52 03.492 +04 56 33.25 V C57
2021-10-29 09:53:56 s 1 +110580.09 9 +328134.55 7770.0 C57
2021-10-29 10:03:56 S 02 52 03.029 +04 56 12.62 V C57
2021-10-29 10:03:56 s 1 +110266.96 1 +328447.97 610.0 C57
2021-10-29 10:13:56 S 02 52 02.494 +04 55 50.27 V C57
2021-10-29 10:13:56 s 1 +109953.45 3 +328760.26 2260.0 C57
2021-10-29 10:23:56 S 02 52 01.934 +04 55 27.84 V C57
2021-10-29 10:23:56 s 1 +109639.58 0 +329071.43 2740.0 C57
2021-10-29 10:33:56 S 02 52 01.430 +04 55 06.20 V C57
2021-10-29 10:33:56 s 1 +109325.34 0 +329381.47 2050.0 C57
2021-10-29 10:43:56 S 02 52 00.914 +04 54 44.10 V C57
2021-10-29 10:43:56 s 1 +109010.73 8 +329690.39 190.0 C57
2021-10-29 10:55:29 C 02 54 07.29 +04 42 47.8 V T08
2021-10-29 11:03:56 S 02 51 59.909 +04 54 00.90 V C57
2021-10-29 11:03:56 s 1 +108380.44 8 +330304.87 3000.0 C57
2021-10-29 11:43:30 C 02 54 05.69 +04 41 09.1 V T08
2021-10-29 11:48:08 C 02 54 05.53 +04 40 59.6 V T08
2021-10-29 11:53:56 S 02 51 57.259 +04 52 11.35 V C57
2021-10-29 11:53:56 s 1 +106798.47 8 +331821.46 5030.0 C57
2021-10-29 11:58:46 C 02 54 05.17 +04 40 37.7 V T08
2021-10-29 12:03:56 S 02 51 56.698 +04 51 48.92 V C57
2021-10-29 12:03:56 s 1 +106481.02 7 +332121.42 4050.0 C57
2021-10-29 12:13:56 S 02 51 56.222 +04 51 27.47 V C57
2021-10-29 12:13:56 s 1 +106163.22 6 +332420.26 1950.0 C57
2021-10-29 12:23:56 S 02 51 55.776 +04 51 04.75 V C57
2021-10-29 12:23:56 s 1 +105845.07 9 +332717.99 8750.0 C57
2021-10-29 12:33:56 S 02 51 55.279 +04 50 42.76 V C57
2021-10-29 12:33:56 s 1 +105526.58 6 +333014.61 4440.0 C57
2021-10-29 12:43:56 S 02 51 54.710 +04 50 20.58 V C57
2021-10-29 12:43:56 s 1 +105207.74 9 +333310.11 9040.0 C57
2021-10-29 12:53:56 S 02 51 54.209 +04 49 58.69 V C57
2021-10-29 12:53:56 s 1 +104888.56 9 +333604.49 2540.0 C57
2021-10-29 13:03:56 S 02 51 53.724 +04 49 35.98 V C57
2021-10-29 13:03:56 s 1 +104569.04 9 +333897.76 4950.0 C57
2021-10-29 13:13:56 S 02 51 53.177 +04 49 14.23 V C57
2021-10-29 13:13:56 s 1 +104249.19 0 +334189.92 6280.0 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)