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
2021-10-16 16:53:56 s 1 +95782.781 0 +334011.86 80.0 C57
2021-10-16 17:13:56 S 02 52 59.150 +11 41 42.36 V C57
2021-10-16 17:13:56 s 1 +95124.372 0 +334581.99 5020.0 C57
2021-10-16 17:33:56 S 02 52 58.925 +11 41 24.14 V C57
2021-10-16 17:33:56 s 1 +94464.677 0 +335147.58 5810.0 C57
2021-10-16 19:13:56 S 02 52 57.598 +11 39 50.62 V C57
2021-10-16 19:13:56 s 1 +91147.329 0 +337907.86 8980.0 C57
2021-10-16 20:33:56 S 02 52 56.604 +11 38 34.01 V C57
2021-10-16 20:33:56 s 1 +88471.550 0 +340035.13 3130.0 C57
2021-10-16 20:43:56 S 02 52 56.455 +11 38 25.98 V C57
2021-10-16 20:43:56 s 1 +88135.752 0 +340296.00 9400.0 C57
2021-10-16 21:03:56 S 02 52 56.069 +11 38 09.24 V C57
2021-10-16 21:03:56 s 1 +87463.289 0 +340814.39 9160.0 C57
2021-10-16 21:23:56 S 02 52 55.867 +11 37 49.94 V C57
2021-10-16 21:23:56 s 1 +86789.679 0 +341328.31 5250.0 C57
2021-10-16 21:33:56 S 02 52 55.774 +11 37 42.82 V C57
2021-10-16 21:33:56 s 1 +86452.448 0 +341583.60 6930.0 C57
2021-10-16 21:43:56 S 02 52 55.680 +11 37 32.95 V C57
2021-10-16 21:43:56 s 1 +86114.935 0 +341837.77 7720.0 C57
2021-10-16 21:53:56 S 02 52 55.541 +11 37 22.87 V C57
2021-10-16 21:53:56 s 1 +85777.141 0 +342090.82 7600.0 C57
2021-10-16 22:03:56 S 02 52 55.354 +11 37 13.08 V C57
2021-10-16 22:03:56 s 1 +85439.068 0 +342342.77 6590.0 C57
2021-10-16 22:13:56 S 02 52 55.272 +11 37 02.57 V C57
2021-10-16 22:13:56 s 1 +85100.717 0 +342593.60 4700.0 C57
2021-10-16 22:33:56 S 02 52 55.015 +11 36 45.36 V C57
2021-10-16 22:33:56 s 1 +84423.187 0 +343091.92 8270.0 C57
2021-10-16 22:43:56 S 02 52 54.936 +11 36 36.97 V C57
2021-10-16 22:43:56 s 1 +84084.012 0 +343339.42 3750.0 C57
2021-10-16 22:53:56 S 02 52 54.773 +11 36 26.39 V C57
2021-10-16 22:53:56 s 1 +83744.564 0 +343585.81 8360.0 C57
2021-10-16 23:03:56 S 02 52 54.655 +11 36 18.14 V C57
2021-10-16 23:03:56 s 1 +83404.845 0 +343831.08 2100.0 C57
2021-10-16 23:13:56 S 02 52 54.578 +11 36 07.09 V C57
2021-10-16 23:13:56 s 1 +83064.858 0 +344075.25 4990.0 C57
2021-10-16 23:23:56 S 02 52 54.202 +11 35 56.33 V C57
2021-10-16 23:23:56 s 1 +82724.602 0 +344318.30 7030.0 C57
2021-10-16 23:33:56 S 02 52 54.190 +11 35 49.06 V C57
2021-10-16 23:33:56 s 1 +82384.081 0 +344560.25 8220.0 C57
2021-10-16 23:43:56 S 02 52 54.019 +11 35 39.84 V C57
2021-10-16 23:43:56 s 1 +82043.294 0 +344801.09 8570.0 C57
2021-10-16 23:53:56 S 02 52 54.060 +11 35 31.67 V C57
2021-10-16 23:53:56 s 1 +81702.244 0 +345040.83 8090.0 C57
2021-10-17 00:03:56 S 02 52 53.993 +11 35 19.36 V C57
2021-10-17 00:03:56 s 1 +81360.932 0 +345279.45 6770.0 C57
2021-10-17 00:13:56 S 02 52 53.710 +11 35 11.83 V C57
2021-10-17 00:13:56 s 1 +81019.359 0 +345516.98 4620.0 C57
2021-10-17 00:23:56 S 02 52 53.707 +11 35 03.70 V C57
2021-10-17 00:23:56 s 1 +80677.527 0 +345753.39 1650.0 C57
2021-10-17 00:33:56 S 02 52 53.482 +11 34 51.10 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)