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 17:03:56 s 1 -59882.087 0 +357034.78 3120.0 C57
2021-10-19 17:13:56 S 02 52 17.738 +10 26 12.80 V C57
2021-10-19 17:13:56 s 1 -60237.192 0 +356857.87 9970.0 C57
2021-10-19 17:23:56 S 02 52 17.726 +10 26 01.07 V C57
2021-10-19 17:23:56 s 1 -60592.116 0 +356679.89 6100.0 C57
2021-10-19 17:33:56 S 02 52 17.674 +10 25 49.33 V C57
2021-10-19 17:33:56 s 1 -60946.858 0 +356500.81 1500.0 C57
2021-10-19 17:43:56 S 02 52 17.590 +10 25 37.24 V C57
2021-10-19 17:43:56 s 1 -61301.417 0 +356320.66 6170.0 C57
2021-10-19 17:53:56 S 02 52 17.662 +10 25 27.52 V C57
2021-10-19 17:53:56 s 1 -61655.791 0 +356139.42 100.0 C57
2021-10-19 18:03:56 S 02 52 17.614 +10 25 13.69 V C57
2021-10-19 18:03:56 s 1 -62009.978 0 +355957.09 3290.0 C57
2021-10-19 18:13:56 S 02 52 17.474 +10 25 00.08 V C57
2021-10-19 18:13:56 s 1 -62363.979 0 +355773.68 5740.0 C57
2021-10-19 18:23:56 S 02 52 17.340 +10 24 51.34 V C57
2021-10-19 18:23:56 s 1 -62717.791 0 +355589.19 7440.0 C57
2021-10-19 18:33:56 S 02 52 16.807 +10 24 41.72 V C57
2021-10-19 18:33:56 s 1 -63071.413 0 +355403.61 8380.0 C57
2021-10-19 18:43:56 S 02 52 17.287 +10 24 30.89 V C57
2021-10-19 18:43:56 s 1 -63424.844 0 +355216.94 8570.0 C57
2021-10-19 19:03:56 S 02 52 17.302 +10 24 03.28 V C57
2021-10-19 19:03:56 s 1 -64131.128 0 +354840.34 6650.0 C57
2021-10-19 19:13:56 S 02 52 17.278 +10 23 53.38 V C57
2021-10-19 19:13:56 s 1 -64483.979 0 +354650.41 4540.0 C57
2021-10-19 19:23:56 S 02 52 17.213 +10 23 40.85 V C57
2021-10-19 19:23:56 s 1 -64836.634 0 +354459.39 1650.0 C57
2021-10-19 19:33:56 S 02 52 17.143 +10 23 28.39 V C57
2021-10-19 19:33:56 s 1 -65189.091 0 +354267.28 7980.0 C57
2021-10-19 19:43:56 S 02 52 17.213 +10 23 15.76 V C57
2021-10-19 19:43:56 s 1 -65541.349 0 +354074.08 3530.0 C57
2021-10-19 19:53:56 S 02 52 17.076 +10 23 04.96 V C57
2021-10-19 19:53:56 s 1 -65893.408 0 +353879.79 8280.0 C57
2021-10-19 20:03:56 S 02 52 16.990 +10 22 53.83 V C57
2021-10-19 20:03:56 s 1 -66245.266 0 +353684.41 2240.0 C57
2021-10-19 20:13:56 S 02 52 17.009 +10 22 41.48 V C57
2021-10-19 20:13:56 s 1 -66596.921 0 +353487.94 5410.0 C57
2021-10-19 20:23:56 S 02 52 17.076 +10 22 28.49 V C57
2021-10-19 20:23:56 s 1 -66948.372 0 +353290.38 7770.0 C57
2021-10-19 20:33:56 S 02 52 16.980 +10 22 18.95 V C57
2021-10-19 20:33:56 s 1 -67299.619 0 +353091.72 9320.0 C57
2021-10-19 20:43:56 S 02 52 16.834 +10 22 05.05 V C57
2021-10-19 20:43:56 s 1 -67650.659 0 +352891.98 60.0 C57
2021-10-19 20:53:56 S 02 52 16.898 +10 21 53.28 V C57
2021-10-19 20:53:56 s 1 -68001.492 0 +352691.14 9990.0 C57
2021-10-19 21:03:56 S 02 52 16.846 +10 21 41.83 V C57
2021-10-19 21:03:56 s 1 -68352.115 0 +352489.20 9090.0 C57
2021-10-19 21:13:56 S 02 52 16.807 +10 21 29.34 V C57
2021-10-19 21:13:56 s 1 -68702.529 0 +352286.18 7370.0 C57
2021-10-19 21:23:56 S 02 52 16.702 +10 21 18.11 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)