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
2021-10-28 13:03:56 S 02 53 08.242 +05 40 11.50 V C57
2021-10-28 13:03:56 s 1 +146187.87 9 +279828.00 6090.0 C57
2021-10-28 13:13:56 S 02 53 07.776 +05 39 50.83 V C57
2021-10-28 13:13:56 s 1 +145936.23 5 +280288.58 9790.0 C57
2021-10-28 13:23:56 S 02 53 07.267 +05 39 30.49 V C57
2021-10-28 13:23:56 s 1 +145684.11 2 +280748.05 1410.0 C57
2021-10-28 13:33:56 S 02 53 06.708 +05 39 10.84 V C57
2021-10-28 13:33:56 s 1 +145431.35 2 +281206.27 950.0 C57
2021-10-28 13:43:56 S 02 53 06.206 +05 38 50.10 V C57
2021-10-28 13:43:56 s 1 +145177.96 0 +281663.26 8400.0 C57
2021-10-28 13:53:56 S 02 53 05.724 +05 38 30.37 V C57
2021-10-28 13:53:56 s 1 +144923.93 8 +282119.01 3780.0 C57
2021-10-28 14:03:56 S 02 53 05.234 +05 38 10.36 V C57
2021-10-28 14:03:56 s 1 +144669.28 9 +282573.53 7100.0 C57
2021-10-28 14:13:56 S 02 53 04.687 +05 37 49.94 V C57
2021-10-28 14:13:56 s 1 +144414.01 5 +283026.81 8360.0 C57
2021-10-28 14:23:56 S 02 53 04.162 +05 37 28.88 V C57
2021-10-28 14:23:56 s 1 +144158.11 9 +283478.86 7580.0 C57
2021-10-28 14:33:56 S 02 53 03.653 +05 37 09.70 V C57
2021-10-28 14:33:56 s 1 +143901.60 4 +283929.68 4760.0 C57
2021-10-28 14:38:57 C 02 54 25.291 +05 23 46.36 V P07
2021-10-28 14:43:56 S 02 53 03.127 +05 36 49.54 V C57
2021-10-28 14:43:56 s 1 +143644.47 3 +284379.27 9920.0 C57
2021-10-28 14:53:56 S 02 53 02.606 +05 36 29.23 V C57
2021-10-28 14:53:56 s 1 +143386.72 7 +284827.62 3060.0 C57
2021-10-28 15:07:32 C 02 54 24.480 +05 22 52.14 V P07
2021-10-28 15:23:56 S 02 53 01.015 +05 35 29.54 V C57
2021-10-28 15:23:56 s 1 +142609.83 5 +286165.33 470.0 C57
2021-10-28 15:33:56 S 02 53 00.473 +05 35 08.63 V C57
2021-10-28 15:33:56 s 1 +142349.66 1 +286608.78 5630.0 C57
2021-10-28 15:43:56 S 02 53 00.199 +05 34 47.78 V C57
2021-10-28 15:43:56 s 1 +142088.88 7 +287051.00 8820.0 C57
2021-10-28 15:48:12 C 02 54 23.275 +05 21 34.38 V P07
2021-10-28 15:53:56 S 02 52 59.698 +05 34 27.95 V C57
2021-10-28 15:53:56 s 1 +141827.51 4 +287492.00 50.0 C57
2021-10-28 16:03:56 S 02 52 58.987 +05 34 08.62 V C57
2021-10-28 16:03:56 s 1 +141565.54 6 +287931.78 9320.0 C57
2021-10-28 16:13:56 S 02 52 58.490 +05 33 47.48 V C57
2021-10-28 16:13:56 s 1 +141302.98 5 +288370.34 6640.0 C57
2021-10-28 16:16:43 C 02 54 22.409 +05 20 39.59 V P07
2021-10-28 16:23:56 S 02 52 57.972 +05 33 27.32 V C57
2021-10-28 16:23:56 s 1 +141039.83 4 +288807.68 2030.0 C57
2021-10-28 16:33:56 S 02 52 57.475 +05 33 07.70 V C57
2021-10-28 16:33:56 s 1 +140776.09 5 +289243.80 5490.0 C57
2021-10-28 16:43:56 S 02 52 56.885 +05 32 46.93 V C57
2021-10-28 16:43:56 s 1 +140511.77 1 +289678.70 7030.0 C57
2021-10-28 16:53:56 S 02 52 56.364 +05 32 25.84 V C57
2021-10-28 16:53:56 s 1 +140246.86 5 +290112.39 6660.0 C57
2021-10-28 17:03:56 S 02 52 55.915 +05 32 05.24 V C57
2021-10-28 17:03:56 s 1 +139981.37 8 +290544.86 4390.0 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)