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
2021-10-19 04:03:56 s 1 -31723.910 0 +367527.20 7530.0 C57
2021-10-19 04:13:56 S 02 52 22.238 +10 41 11.72 V C57
2021-10-19 04:13:56 s 1 -32089.507 0 +367433.66 7930.0 C57
2021-10-19 04:23:56 S 02 52 22.138 +10 41 01.54 V C57
2021-10-19 04:23:56 s 1 -32455.014 0 +367339.07 7930.0 C57
2021-10-19 04:33:56 S 02 52 22.102 +10 40 49.58 V C57
2021-10-19 04:33:56 s 1 -32820.428 0 +367243.42 7520.0 C57
2021-10-19 04:43:56 S 02 52 21.847 +10 40 38.06 V C57
2021-10-19 04:43:56 s 1 -33185.748 0 +367146.72 6690.0 C57
2021-10-19 04:53:56 S 02 52 21.982 +10 40 26.98 V C57
2021-10-19 04:53:56 s 1 -33550.975 0 +367048.95 5450.0 C57
2021-10-19 05:03:56 S 02 52 21.869 +10 40 14.70 V C57
2021-10-19 05:03:56 s 1 -33916.106 0 +366950.13 3790.0 C57
2021-10-19 05:13:56 S 02 52 21.778 +10 40 03.22 V C57
2021-10-19 05:13:56 s 1 -34281.141 0 +366850.24 1710.0 C57
2021-10-19 05:23:56 S 02 52 21.799 +10 39 51.62 V C57
2021-10-19 05:23:56 s 1 -34646.078 0 +366749.30 9200.0 C57
2021-10-19 05:33:56 S 02 52 21.593 +10 39 41.04 V C57
2021-10-19 05:33:56 s 1 -35010.917 0 +366647.30 6250.0 C57
2021-10-19 05:43:56 S 02 52 21.600 +10 39 29.38 V C57
2021-10-19 05:43:56 s 1 -35375.655 0 +366544.24 2870.0 C57
2021-10-19 05:53:56 S 02 52 21.607 +10 39 18.40 V C57
2021-10-19 05:53:56 s 1 -35740.293 0 +366440.13 9060.0 C57
2021-10-19 06:03:56 S 02 52 21.408 +10 39 08.50 V C57
2021-10-19 06:03:56 s 1 -36104.829 0 +366334.95 4790.0 C57
2021-10-19 06:13:56 S 02 52 21.317 +10 38 56.29 V C57
2021-10-19 06:13:56 s 1 -36469.262 0 +366228.71 90.0 C57
2021-10-19 06:23:56 S 02 52 21.386 +10 38 44.30 V C57
2021-10-19 06:23:56 s 1 -36833.590 0 +366121.41 4930.0 C57
2021-10-19 06:33:56 S 02 52 21.252 +10 38 35.23 V C57
2021-10-19 06:33:56 s 1 -37197.814 0 +366013.05 9310.0 C57
2021-10-19 06:43:56 S 02 52 21.329 +10 38 20.65 V C57
2021-10-19 06:43:56 s 1 -37561.931 0 +365903.63 3240.0 C57
2021-10-19 06:53:56 S 02 52 21.154 +10 38 10.54 V C57
2021-10-19 06:53:56 s 1 -37925.940 0 +365793.14 6700.0 C57
2021-10-19 07:03:56 S 02 52 21.022 +10 37 58.30 V C57
2021-10-19 07:03:56 s 1 -38289.841 0 +365681.60 9700.0 C57
2021-10-19 07:13:56 S 02 52 20.957 +10 37 46.70 V C57
2021-10-19 07:13:56 s 1 -38653.632 0 +365568.99 2220.0 C57
2021-10-19 07:23:56 S 02 52 20.887 +10 37 37.09 V C57
2021-10-19 07:23:56 s 1 -39017.312 0 +365455.33 4270.0 C57
2021-10-19 07:33:56 S 02 52 20.940 +10 37 24.02 V C57
2021-10-19 07:33:56 s 1 -39380.880 0 +365340.60 5850.0 C57
2021-10-19 07:43:56 S 02 52 20.777 +10 37 13.37 V C57
2021-10-19 07:43:56 s 1 -39744.335 0 +365224.80 6930.0 C57
2021-10-19 07:53:56 S 02 52 20.734 +10 36 59.98 V C57
2021-10-19 07:53:56 s 1 -40107.676 0 +365107.95 7540.0 C57
2021-10-19 08:23:56 S 02 52 20.566 +10 36 27.54 V C57
2021-10-19 08:23:56 s 1 -41197.002 0 +364751.00 6390.0 C57
2021-10-19 08:33:56 S 02 52 20.561 +10 36 16.49 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)