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
2021-10-18 22:53:56 s 1 -20351.152 0 +369903.39 5300.0 C57
2021-10-18 23:03:56 S 02 52 24.444 +10 47 01.10 V C57
2021-10-18 23:03:56 s 1 -20719.036 0 +369842.53 6350.0 C57
2021-10-18 23:13:56 S 02 52 24.434 +10 46 48.18 V C57
2021-10-18 23:13:56 s 1 -21086.862 0 +369780.63 7110.0 C57
2021-10-18 23:33:56 S 02 52 24.132 +10 46 24.49 V C57
2021-10-18 23:33:56 s 1 -21822.336 0 +369653.66 7770.0 C57
2021-10-18 23:53:56 S 02 52 24.070 +10 46 05.09 V C57
2021-10-18 23:53:56 s 1 -22557.567 0 +369522.49 7220.0 C57
2021-10-19 00:13:56 S 02 52 23.772 +10 45 41.36 V C57
2021-10-19 00:13:56 s 1 -23292.546 0 +369387.11 5460.0 C57
2021-10-19 00:33:56 S 02 52 23.741 +10 45 17.96 V C57
2021-10-19 00:33:56 s 1 -24027.264 0 +369247.51 2440.0 C57
2021-10-19 00:53:56 S 02 52 23.561 +10 44 55.79 V C57
2021-10-19 00:53:56 s 1 -24761.713 0 +369103.71 8150.0 C57
2021-10-19 01:03:56 S 02 52 23.489 +10 44 45.56 V C57
2021-10-19 01:03:56 s 1 -25128.833 0 +369030.23 5510.0 C57
2021-10-19 01:13:56 S 02 52 23.393 +10 44 34.40 V C57
2021-10-19 01:13:56 s 1 -25495.884 0 +368955.69 2530.0 C57
2021-10-19 01:23:56 S 02 52 23.479 +10 44 22.63 V C57
2021-10-19 01:23:56 s 1 -25862.862 0 +368880.10 9230.0 C57
2021-10-19 01:33:56 S 02 52 23.275 +10 44 11.36 V C57
2021-10-19 01:33:56 s 1 -26229.768 0 +368803.46 5580.0 C57
2021-10-19 01:43:56 S 02 52 23.244 +10 44 01.28 V C57
2021-10-19 01:43:56 s 1 -26596.601 0 +368725.76 1590.0 C57
2021-10-19 01:53:56 S 02 52 23.153 +10 43 51.64 V C57
2021-10-19 01:53:56 s 1 -26963.358 0 +368647.01 7250.0 C57
2021-10-19 02:03:56 S 02 52 23.023 +10 43 38.17 V C57
2021-10-19 02:03:56 s 1 -27330.040 0 +368567.20 2560.0 C57
2021-10-19 02:13:56 S 02 52 23.066 +10 43 27.88 V C57
2021-10-19 02:13:56 s 1 -27696.645 0 +368486.34 7520.0 C57
2021-10-19 02:23:56 S 02 52 23.021 +10 43 15.06 V C57
2021-10-19 02:23:56 s 1 -28063.171 0 +368404.42 2110.0 C57
2021-10-19 02:33:56 S 02 52 22.771 +10 43 03.90 V C57
2021-10-19 02:33:56 s 1 -28429.619 0 +368321.45 6350.0 C57
2021-10-19 02:43:56 S 02 52 22.802 +10 42 52.56 V C57
2021-10-19 02:43:56 s 1 -28795.986 0 +368237.42 220.0 C57
2021-10-19 03:03:56 S 02 52 22.663 +10 42 30.74 V C57
2021-10-19 03:03:56 s 1 -29528.476 0 +368066.20 6840.0 C57
2021-10-19 03:13:56 S 02 52 22.452 +10 42 21.28 V C57
2021-10-19 03:13:56 s 1 -29894.597 0 +367979.01 9590.0 C57
2021-10-19 03:23:56 S 02 52 22.582 +10 42 07.70 V C57
2021-10-19 03:23:56 s 1 -30260.633 0 +367890.76 1960.0 C57
2021-10-19 03:33:56 S 02 52 22.500 +10 41 56.51 V C57
2021-10-19 03:33:56 s 1 -30626.583 0 +367801.45 3940.0 C57
2021-10-19 03:43:56 S 02 52 22.464 +10 41 45.64 V C57
2021-10-19 03:43:56 s 1 -30992.447 0 +367711.09 5530.0 C57
2021-10-19 03:53:56 S 02 52 22.265 +10 41 34.94 V C57
2021-10-19 03:53:56 s 1 -31358.223 0 +367619.67 6730.0 C57
2021-10-19 04:03:56 S 02 52 22.145 +10 41 23.82 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)