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
2021-10-22 04:23:56 s 1 -162580.71 0 +220309.03 3790.0 C57
2021-10-22 04:33:56 S 02 52 32.554 +09 11 15.72 V C57
2021-10-22 04:33:56 s 1 -162752.52 8 +219694.83 5920.0 C57
2021-10-22 04:43:56 S 02 52 32.825 +09 11 02.18 V C57
2021-10-22 04:43:56 s 1 -162923.27 4 +219079.18 4220.0 C57
2021-10-22 04:53:56 S 02 52 32.981 +09 10 47.86 V C57
2021-10-22 04:53:56 s 1 -163092.94 3 +218462.07 8660.0 C57
2021-10-22 05:03:56 S 02 52 33.199 +09 10 34.64 V C57
2021-10-22 05:03:56 s 1 -163261.52 8 +217843.51 9210.0 C57
2021-10-22 05:13:56 S 02 52 33.374 +09 10 22.26 V C57
2021-10-22 05:13:56 s 1 -163429.02 6 +217223.48 5870.0 C57
2021-10-22 05:23:56 S 02 52 33.516 +09 10 07.82 V C57
2021-10-22 05:23:56 s 1 -163595.42 9 +216602.00 8620.0 C57
2021-10-22 05:33:56 S 02 52 33.619 +09 09 53.71 V C57
2021-10-22 05:33:56 s 1 -163760.73 3 +215979.05 7420.0 C57
2021-10-22 05:43:56 S 02 52 33.828 +09 09 41.76 V C57
2021-10-22 05:43:56 s 1 -163924.93 2 +215354.64 2280.0 C57
2021-10-22 05:53:56 S 02 52 34.046 +09 09 28.84 V C57
2021-10-22 05:53:56 s 1 -164088.02 1 +214728.76 3160.0 C57
2021-10-22 06:03:56 S 02 52 34.121 +09 09 15.08 V C57
2021-10-22 06:03:56 s 1 -164249.99 3 +214101.42 40.0 C57
2021-10-22 06:13:56 S 02 52 34.298 +09 09 01.04 V C57
2021-10-22 06:13:56 s 1 -164410.84 2 +213472.60 2910.0 C57
2021-10-22 06:23:56 S 02 52 34.490 +09 08 50.64 V C57
2021-10-22 06:23:56 s 1 -164570.56 5 +212842.31 1740.0 C57
2021-10-22 06:33:56 S 02 52 34.668 +09 08 34.73 V C57
2021-10-22 06:33:56 s 1 -164729.15 3 +212210.55 6520.0 C57
2021-10-22 06:43:56 S 02 52 34.874 +09 08 21.59 V C57
2021-10-22 06:43:56 s 1 -164886.60 2 +211577.32 7230.0 C57
2021-10-22 06:53:56 S 02 52 35.016 +09 08 08.05 V C57
2021-10-22 06:53:56 s 1 -165042.90 6 +210942.61 3840.0 C57
2021-10-22 07:03:56 S 02 52 35.198 +09 07 53.76 V C57
2021-10-22 07:03:56 s 1 -165198.05 9 +210306.42 6330.0 C57
2021-10-22 07:13:56 S 02 52 35.378 +09 07 39.54 V C57
2021-10-22 07:13:56 s 1 -165352.05 4 +209668.74 4690.0 C57
2021-10-22 07:23:56 S 02 52 35.621 +09 07 27.01 V C57
2021-10-22 07:23:56 s 1 -165504.88 7 +209029.59 8900.0 C57
2021-10-22 07:33:56 S 02 52 35.762 +09 07 13.76 V C57
2021-10-22 07:33:56 s 1 -165656.55 0 +208388.96 8920.0 C57
2021-10-22 07:43:56 S 02 52 35.969 +09 07 01.38 V C57
2021-10-22 07:43:56 s 1 -165807.03 8 +207746.83 4750.0 C57
2021-10-22 07:53:56 S 02 52 36.050 +09 06 47.16 V C57
2021-10-22 07:53:56 s 1 -165956.34 5 +207103.23 6350.0 C57
2021-10-22 08:03:56 S 02 52 36.257 +09 06 33.37 V C57
2021-10-22 08:03:56 s 1 -166104.46 4 +206458.13 3710.0 C57
2021-10-22 08:13:56 S 02 52 36.487 +09 06 20.16 V C57
2021-10-22 08:13:56 s 1 -166251.38 9 +205811.54 6820.0 C57
2021-10-22 08:23:56 S 02 52 36.653 +09 06 05.98 V C57
2021-10-22 08:23:56 s 1 -166397.11 5 +205163.46 5630.0 C57
2021-10-22 08:33:56 S 02 52 36.847 +09 05 53.74 V 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)