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
2021-10-27 21:13:56 S 02 53 56.995 +06 10 42.78 V C57
2021-10-27 21:13:56 s 1 +166701.24 7 +230224.09 6260.0 C57
2021-10-27 21:23:56 S 02 53 56.578 +06 10 24.35 V C57
2021-10-27 21:23:56 s 1 +166525.41 1 +230808.33 490.0 C57
2021-10-27 21:33:56 S 02 53 56.117 +06 10 05.66 V C57
2021-10-27 21:33:56 s 1 +166348.59 7 +231391.21 1470.0 C57
2021-10-27 21:43:56 S 02 53 55.610 +06 09 46.84 V C57
2021-10-27 21:43:56 s 1 +166170.80 7 +231972.73 9200.0 C57
2021-10-27 21:53:56 S 02 53 55.034 +06 09 28.22 V C57
2021-10-27 21:53:56 s 1 +165992.04 7 +232552.88 3700.0 C57
2021-10-27 22:03:56 S 02 53 54.511 +06 09 09.32 V C57
2021-10-27 22:03:56 s 1 +165812.32 1 +233131.68 4990.0 C57
2021-10-27 22:13:56 S 02 53 54.007 +06 08 51.61 V C57
2021-10-27 22:13:56 s 1 +165631.63 3 +233709.11 3090.0 C57
2021-10-27 22:23:56 S 02 53 53.568 +06 08 32.10 V C57
2021-10-27 22:23:56 s 1 +165449.98 9 +234285.19 8000.0 C57
2021-10-27 22:33:56 S 02 53 53.093 +06 08 13.92 V C57
2021-10-27 22:33:56 s 1 +165267.39 3 +234859.91 9750.0 C57
2021-10-27 22:43:56 S 02 53 52.531 +06 07 55.16 V C57
2021-10-27 22:43:56 s 1 +165083.84 9 +235433.27 8340.0 C57
2021-10-27 22:53:56 S 02 53 51.989 +06 07 35.65 V C57
2021-10-27 22:53:56 s 1 +164899.36 1 +236005.29 3800.0 C57
2021-10-27 23:03:56 S 02 53 51.473 +06 07 17.36 V C57
2021-10-27 23:03:56 s 1 +164713.93 4 +236575.95 6130.0 C57
2021-10-27 23:13:56 S 02 53 50.894 +06 06 58.61 V C57
2021-10-27 23:13:56 s 1 +164527.57 3 +237145.25 5360.0 C57
2021-10-27 23:23:56 S 02 53 50.472 +06 06 40.21 V C57
2021-10-27 23:23:56 s 1 +164340.28 1 +237713.21 1500.0 C57
2021-10-27 23:33:56 S 02 53 49.982 +06 06 21.42 V C57
2021-10-27 23:33:56 s 1 +164152.06 3 +238279.83 4560.0 C57
2021-10-27 23:43:56 S 02 53 49.466 +06 06 02.41 V C57
2021-10-27 23:43:56 s 1 +163962.92 4 +238845.09 4560.0 C57
2021-10-27 23:53:56 S 02 53 48.905 +06 05 43.76 V C57
2021-10-27 23:53:56 s 1 +163772.86 6 +239409.01 1510.0 C57
2021-10-28 00:03:56 S 02 53 48.406 +06 05 24.58 V C57
2021-10-28 00:03:56 s 1 +163581.89 6 +239971.59 5430.0 C57
2021-10-28 00:13:56 S 02 53 47.928 +06 05 06.36 V C57
2021-10-28 00:13:56 s 1 +163390.01 7 +240532.82 6320.0 C57
2021-10-28 00:23:56 S 02 53 47.369 +06 04 48.07 V C57
2021-10-28 00:23:56 s 1 +163197.23 3 +241092.72 4220.0 C57
2021-10-28 00:33:56 S 02 53 46.944 +06 04 28.92 V C57
2021-10-28 00:33:56 s 1 +163003.54 8 +241651.27 9120.0 C57
2021-10-28 00:43:56 S 02 53 46.414 +06 04 10.02 V C57
2021-10-28 00:43:56 s 1 +162808.96 7 +242208.49 1040.0 C57
2021-10-28 00:53:56 S 02 53 45.881 +06 03 50.44 V C57
2021-10-28 00:53:56 s 1 +162613.49 3 +242764.37 0.0 C57
2021-10-28 01:03:56 S 02 53 45.382 +06 03 31.75 V C57
2021-10-28 01:03:56 s 1 +162417.13 1 +243318.92 6010.0 C57
2021-10-28 01:13:56 S 02 53 44.820 +06 03 13.43 V C57
2021-10-28 01:13:56 s 1 +162219.88 5 +243872.13 9090.0 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)