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
2021-10-15 23:23:56 S 02 53 13.318 +11 57 22.54 V C57
2021-10-15 23:23:56 s 1 +128185.94 8 +297560.36 3560.0 C57
2021-10-15 23:33:56 S 02 53 13.123 +11 57 16.52 V C57
2021-10-15 23:33:56 s 1 +127900.90 8 +297969.51 5580.0 C57
2021-10-15 23:43:56 S 02 53 12.938 +11 57 08.71 V C57
2021-10-15 23:43:56 s 1 +127615.34 2 +298377.43 5850.0 C57
2021-10-15 23:53:56 S 02 53 12.845 +11 56 58.09 V C57
2021-10-15 23:53:56 s 1 +127329.25 3 +298784.12 4390.0 C57
2021-10-16 00:03:56 S 02 53 12.636 +11 56 51.14 V C57
2021-10-16 00:03:56 s 1 +127042.64 1 +299189.60 1220.0 C57
2021-10-16 00:13:56 S 02 53 12.713 +11 56 42.29 V C57
2021-10-16 00:13:56 s 1 +126755.51 1 +299593.84 6330.0 C57
2021-10-16 00:23:56 S 02 53 12.634 +11 56 36.82 V C57
2021-10-16 00:23:56 s 1 +126467.86 3 +299996.87 9730.0 C57
2021-10-16 00:33:56 S 02 53 12.552 +11 56 26.77 V C57
2021-10-16 00:33:56 s 1 +126179.70 1 +300398.68 1440.0 C57
2021-10-16 00:43:56 S 02 53 12.408 +11 56 15.76 V C57
2021-10-16 00:43:56 s 1 +125891.02 7 +300799.26 1450.0 C57
2021-10-16 00:53:56 S 02 53 12.295 +11 56 07.66 V C57
2021-10-16 00:53:56 s 1 +125601.84 3 +301198.63 9790.0 C57
2021-10-16 01:03:56 S 02 53 12.180 +11 56 00.42 V C57
2021-10-16 01:03:56 s 1 +125312.15 1 +301596.78 6440.0 C57
2021-10-16 01:13:56 S 02 53 12.038 +11 55 52.03 V C57
2021-10-16 01:13:56 s 1 +125021.95 3 +301993.72 1440.0 C57
2021-10-16 01:23:56 S 02 53 11.890 +11 55 41.77 V C57
2021-10-16 01:23:56 s 1 +124731.25 3 +302389.43 4770.0 C57
2021-10-16 01:43:56 S 02 53 11.462 +11 55 23.27 V C57
2021-10-16 01:43:56 s 1 +124148.35 2 +303177.23 6490.0 C57
2021-10-16 01:53:56 S 02 53 11.498 +11 55 16.57 V C57
2021-10-16 01:53:56 s 1 +123856.15 5 +303569.31 4890.0 C57
2021-10-16 02:03:56 S 02 53 11.400 +11 55 08.47 V C57
2021-10-16 02:03:56 s 1 +123563.46 5 +303960.17 1670.0 C57
2021-10-16 02:13:56 S 02 53 11.155 +11 54 59.00 V C57
2021-10-16 02:13:56 s 1 +123270.28 3 +304349.83 6820.0 C57
2021-10-16 02:23:56 S 02 53 10.975 +11 54 50.44 V C57
2021-10-16 02:23:56 s 1 +122976.61 0 +304738.28 360.0 C57
2021-10-16 02:33:56 S 02 53 10.994 +11 54 44.50 V C57
2021-10-16 02:33:56 s 1 +122682.45 1 +305125.52 2300.0 C57
2021-10-16 02:43:56 S 02 53 10.896 +11 54 34.92 V C57
2021-10-16 02:43:56 s 1 +122387.80 6 +305511.55 2640.0 C57
2021-10-16 02:53:56 S 02 53 10.594 +11 54 24.30 V C57
2021-10-16 02:53:56 s 1 +122092.67 8 +305896.38 1380.0 C57
2021-10-16 03:03:56 S 02 53 10.447 +11 54 16.67 V C57
2021-10-16 03:03:56 s 1 +121797.06 9 +306280.00 8550.0 C57
2021-10-16 03:13:56 S 02 53 10.279 +11 54 08.64 V C57
2021-10-16 03:13:56 s 1 +121500.98 1 +306662.42 4130.0 C57
2021-10-16 03:23:56 S 02 53 10.234 +11 53 58.38 V C57
2021-10-16 03:23:56 s 1 +121204.41 7 +307043.64 8150.0 C57
2021-10-16 03:33:56 S 02 53 10.008 +11 53 51.47 V C57
2021-10-16 03:33:56 s 1 +120907.37 8 +307423.65 610.0 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)