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
2021-10-26 14:53:56 S 02 55 24.178 +07 02 12.23 V C57
2021-10-26 14:53:56 s 1 +175823.05 1 +99673.117 30.0 C57
2021-10-26 15:03:56 S 02 55 23.801 +07 01 57.54 V C57
2021-10-26 15:03:56 s 1 +175946.81 3 +100528.14 580.0 C57
2021-10-26 15:13:56 S 02 55 23.328 +07 01 43.39 V C57
2021-10-26 15:13:56 s 1 +176067.89 2 +101381.64 2050.0 C57
2021-10-26 15:23:56 S 02 55 22.891 +07 01 26.11 V C57
2021-10-26 15:23:56 s 1 +176186.30 6 +102233.60 4520.0 C57
2021-10-26 15:33:56 S 02 55 22.486 +07 01 11.21 V C57
2021-10-26 15:33:56 s 1 +176302.07 4 +103084.02 8040.0 C57
2021-10-26 15:43:56 S 02 55 21.979 +07 00 56.45 V C57
2021-10-26 15:43:56 s 1 +176415.21 3 +103932.91 2660.0 C57
2021-10-26 15:53:56 S 02 55 21.554 +07 00 40.90 V C57
2021-10-26 15:53:56 s 1 +176525.73 9 +104780.25 8460.0 C57
2021-10-26 16:03:56 S 02 55 21.180 +07 00 26.17 V C57
2021-10-26 16:03:56 s 1 +176633.67 0 +105626.06 5480.0 C57
2021-10-26 16:13:56 S 02 55 20.717 +07 00 11.30 V C57
2021-10-26 16:13:56 s 1 +176739.02 4 +106470.32 3790.0 C57
2021-10-26 16:23:56 S 02 55 20.273 +06 59 54.96 V C57
2021-10-26 16:23:56 s 1 +176841.81 6 +107313.03 3440.0 C57
2021-10-26 16:33:56 S 02 55 19.853 +06 59 39.66 V C57
2021-10-26 16:33:56 s 1 +176942.06 5 +108154.20 4500.0 C57
2021-10-26 16:43:56 S 02 55 19.399 +06 59 23.39 V C57
2021-10-26 16:43:56 s 1 +177039.78 5 +108993.83 7010.0 C57
2021-10-26 16:53:56 S 02 55 18.893 +06 59 08.30 V C57
2021-10-26 16:53:56 s 1 +177134.99 4 +109831.91 1040.0 C57
2021-10-26 17:03:56 S 02 55 18.526 +06 58 52.75 V C57
2021-10-26 17:03:56 s 1 +177227.70 9 +110668.44 6640.0 C57
2021-10-26 17:13:56 S 02 55 18.130 +06 58 38.06 V C57
2021-10-26 17:13:56 s 1 +177317.94 4 +111503.42 3870.0 C57
2021-10-26 17:23:56 S 02 55 17.674 +06 58 21.54 V C57
2021-10-26 17:23:56 s 1 +177405.71 6 +112336.85 2780.0 C57
2021-10-26 17:33:56 S 02 55 17.206 +06 58 06.28 V C57
2021-10-26 17:33:56 s 1 +177491.04 2 +113168.73 3420.0 C57
2021-10-26 17:43:56 S 02 55 16.723 +06 57 51.48 V C57
2021-10-26 17:43:56 s 1 +177573.93 6 +113999.05 5860.0 C57
2021-10-26 17:53:56 S 02 55 16.294 +06 57 34.99 V C57
2021-10-26 17:53:56 s 1 +177654.41 4 +114827.83 130.0 C57
2021-10-26 18:03:56 S 02 55 15.926 +06 57 19.84 V C57
2021-10-26 18:03:56 s 1 +177732.49 2 +115655.05 6310.0 C57
2021-10-26 18:13:56 S 02 55 15.497 +06 57 03.42 V C57
2021-10-26 18:13:56 s 1 +177808.18 5 +116480.72 4420.0 C57
2021-10-26 18:23:56 S 02 55 14.964 +06 56 48.52 V C57
2021-10-26 18:23:56 s 1 +177881.50 8 +117304.83 4540.0 C57
2021-10-26 18:33:56 S 02 55 14.522 +06 56 32.50 V C57
2021-10-26 18:33:56 s 1 +177952.47 6 +118127.39 6720.0 C57
2021-10-26 18:43:56 S 02 55 14.119 +06 56 17.45 V C57
2021-10-26 18:43:56 s 1 +178021.10 5 +118948.40 990.0 C57
2021-10-26 18:53:56 S 02 55 13.620 +06 56 01.10 V C57
2021-10-26 18:53:56 s 1 +178087.40 8 +119767.85 7420.0 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)