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
2021-10-21 20:03:56 s 1 -152733.56 4 +249202.09 4670.0 C57
2021-10-21 20:13:56 S 02 52 25.550 +09 22 18.62 V C57
2021-10-21 20:13:56 s 1 -152952.75 8 +248658.47 7190.0 C57
2021-10-21 20:23:56 S 02 52 25.639 +09 22 08.83 V C57
2021-10-21 20:23:56 s 1 -153171.11 2 +248113.48 6670.0 C57
2021-10-21 20:33:56 S 02 52 25.757 +09 21 54.36 V C57
2021-10-21 20:33:56 s 1 -153388.62 3 +247567.11 3120.0 C57
2021-10-21 20:43:56 S 02 52 25.874 +09 21 41.11 V C57
2021-10-21 20:43:56 s 1 -153605.28 7 +247019.37 6500.0 C57
2021-10-21 20:53:56 S 02 52 26.028 +09 21 28.73 V C57
2021-10-21 20:53:56 s 1 -153821.09 8 +246470.25 6810.0 C57
2021-10-21 21:03:56 S 02 52 26.179 +09 21 15.16 V C57
2021-10-21 21:03:56 s 1 -154036.05 5 +245919.75 4030.0 C57
2021-10-21 21:13:56 S 02 52 26.244 +09 21 02.27 V C57
2021-10-21 21:13:56 s 1 -154250.15 1 +245367.88 8150.0 C57
2021-10-21 21:23:56 S 02 52 26.424 +09 20 47.33 V C57
2021-10-21 21:23:56 s 1 -154463.38 4 +244814.62 9150.0 C57
2021-10-21 21:33:56 S 02 52 26.510 +09 20 34.58 V C57
2021-10-21 21:33:56 s 1 -154675.74 8 +244259.98 7020.0 C57
2021-10-21 21:43:56 S 02 52 26.633 +09 20 21.73 V C57
2021-10-21 21:43:56 s 1 -154887.24 1 +243703.95 1740.0 C57
2021-10-21 21:53:56 S 02 52 26.707 +09 20 09.31 V C57
2021-10-21 21:53:56 s 1 -155097.85 7 +243146.54 3310.0 C57
2021-10-21 22:03:56 S 02 52 26.839 +09 19 55.09 V C57
2021-10-21 22:03:56 s 1 -155307.59 3 +242587.74 1700.0 C57
2021-10-21 22:13:56 S 02 52 27.055 +09 19 42.38 V C57
2021-10-21 22:13:56 s 1 -155516.44 3 +242027.55 6900.0 C57
2021-10-21 22:23:56 S 02 52 27.156 +09 19 28.49 V C57
2021-10-21 22:23:56 s 1 -155724.40 5 +241465.97 8900.0 C57
2021-10-21 22:33:56 S 02 52 27.250 +09 19 15.24 V C57
2021-10-21 22:33:56 s 1 -155931.47 4 +240903.00 7680.0 C57
2021-10-21 22:43:56 S 02 52 27.449 +09 19 02.10 V C57
2021-10-21 22:43:56 s 1 -156137.64 4 +240338.64 3220.0 C57
2021-10-21 22:53:56 S 02 52 27.540 +09 18 48.85 V C57
2021-10-21 22:53:56 s 1 -156342.91 3 +239772.88 5520.0 C57
2021-10-21 23:03:56 S 02 52 27.718 +09 18 34.06 V C57
2021-10-21 23:03:56 s 1 -156547.27 5 +239205.72 4550.0 C57
2021-10-21 23:13:56 S 02 52 27.840 +09 18 23.15 V C57
2021-10-21 23:13:56 s 1 -156750.72 7 +238637.16 290.0 C57
2021-10-21 23:23:56 S 02 52 27.974 +09 18 09.25 V C57
2021-10-21 23:23:56 s 1 -156953.26 3 +238067.20 2750.0 C57
2021-10-21 23:33:56 S 02 52 28.128 +09 17 54.78 V C57
2021-10-21 23:33:56 s 1 -157154.88 0 +237495.84 1890.0 C57
2021-10-21 23:43:56 S 02 52 28.176 +09 17 43.94 V C57
2021-10-21 23:43:56 s 1 -157355.57 2 +236923.08 7710.0 C57
2021-10-21 23:53:56 S 02 52 28.294 +09 17 29.51 V C57
2021-10-21 23:53:56 s 1 -157555.33 6 +236348.91 180.0 C57
2021-10-22 00:03:56 S 02 52 28.565 +09 17 14.75 V C57
2021-10-22 00:03:56 s 1 -157754.16 7 +235773.33 9300.0 C57
2021-10-22 00:13:56 S 02 52 28.687 +09 17 02.26 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)