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
2021-10-20 19:03:56 s 1 -112244.71 4 +316004.03 440.0 C57
2021-10-20 19:13:56 S 02 52 15.535 +09 54 37.37 V C57
2021-10-20 19:13:56 s 1 -112554.46 9 +315651.08 4180.0 C57
2021-10-20 19:23:56 S 02 52 15.566 +09 54 25.60 V C57
2021-10-20 19:23:56 s 1 -112863.80 5 +315296.95 6360.0 C57
2021-10-20 19:33:56 S 02 52 15.528 +09 54 11.56 V C57
2021-10-20 19:33:56 s 1 -113172.71 8 +314941.62 6970.0 C57
2021-10-20 19:43:56 S 02 52 15.624 +09 53 59.78 V C57
2021-10-20 19:43:56 s 1 -113481.20 6 +314585.11 5990.0 C57
2021-10-20 19:53:56 S 02 52 15.547 +09 53 45.31 V C57
2021-10-20 19:53:56 s 1 -113789.26 8 +314227.41 3430.0 C57
2021-10-20 20:03:56 S 02 52 15.643 +09 53 33.54 V C57
2021-10-20 20:03:56 s 1 -114096.90 2 +313868.51 9280.0 C57
2021-10-20 20:13:56 S 02 52 15.614 +09 53 21.84 V C57
2021-10-20 20:13:56 s 1 -114404.10 6 +313508.43 3520.0 C57
2021-10-20 20:23:56 S 02 52 15.626 +09 53 08.70 V C57
2021-10-20 20:23:56 s 1 -114710.87 7 +313147.15 6150.0 C57
2021-10-20 20:33:56 S 02 52 15.607 +09 52 56.32 V C57
2021-10-20 20:33:56 s 1 -115017.21 4 +312784.67 7170.0 C57
2021-10-20 20:43:56 S 02 52 15.811 +09 52 43.32 V C57
2021-10-20 20:43:56 s 1 -115323.11 4 +312421.01 6570.0 C57
2021-10-20 20:53:56 S 02 52 15.727 +09 52 29.60 V C57
2021-10-20 20:53:56 s 1 -115628.57 6 +312056.14 4340.0 C57
2021-10-20 21:03:56 S 02 52 15.898 +09 52 19.78 V C57
2021-10-20 21:03:56 s 1 -115933.59 8 +311690.08 470.0 C57
2021-10-20 21:13:56 S 02 52 15.938 +09 52 05.92 V C57
2021-10-20 21:13:56 s 1 -116238.17 7 +311322.83 4960.0 C57
2021-10-20 21:23:56 S 02 52 15.874 +09 51 54.50 V C57
2021-10-20 21:23:56 s 1 -116542.31 1 +310954.37 7800.0 C57
2021-10-20 21:33:56 S 02 52 15.900 +09 51 40.03 V C57
2021-10-20 21:33:56 s 1 -116845.99 9 +310584.71 8980.0 C57
2021-10-20 21:43:56 S 02 52 15.953 +09 51 26.03 V C57
2021-10-20 21:43:56 s 1 -117149.23 9 +310213.86 8490.0 C57
2021-10-20 21:53:56 S 02 52 16.054 +09 51 15.23 V C57
2021-10-20 21:53:56 s 1 -117452.02 7 +309841.80 6330.0 C57
2021-10-20 22:03:56 S 02 52 15.895 +09 51 02.70 V C57
2021-10-20 22:03:56 s 1 -117754.36 3 +309468.54 2490.0 C57
2021-10-20 22:13:56 S 02 52 16.018 +09 50 51.25 V C57
2021-10-20 22:13:56 s 1 -118056.24 4 +309094.07 6960.0 C57
2021-10-20 22:23:56 S 02 52 16.039 +09 50 37.93 V C57
2021-10-20 22:23:56 s 1 -118357.66 7 +308718.40 9740.0 C57
2021-10-20 22:33:56 S 02 52 16.094 +09 50 24.36 V C57
2021-10-20 22:33:56 s 1 -118658.63 2 +308341.53 820.0 C57
2021-10-20 22:43:56 S 02 52 16.013 +09 50 12.77 V C57
2021-10-20 22:43:56 s 1 -118959.13 6 +307963.45 190.0 C57
2021-10-20 22:53:56 S 02 52 16.243 +09 49 58.91 V C57
2021-10-20 22:53:56 s 1 -119259.17 6 +307584.16 7840.0 C57
2021-10-20 23:03:56 S 02 52 16.030 +09 49 46.99 V C57
2021-10-20 23:03:56 s 1 -119558.75 0 +307203.66 3760.0 C57
2021-10-20 23:13:56 S 02 52 16.169 +09 49 34.21 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)