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
2021-10-17 00:33:56 s 1 +80335.437 0 +345988.70 7860.0 C57
2021-10-17 01:03:56 S 02 52 52.915 +11 34 24.67 V C57
2021-10-17 01:03:56 s 1 +79307.634 0 +346688.02 1630.0 C57
2021-10-17 01:33:56 S 02 52 52.817 +11 33 52.99 V C57
2021-10-17 01:33:56 s 1 +78277.560 0 +347377.40 8220.0 C57
2021-10-17 01:53:56 S 02 52 52.500 +11 33 37.15 V C57
2021-10-17 01:53:56 s 1 +77589.601 0 +347831.49 8690.0 C57
2021-10-17 02:23:56 S 02 52 52.022 +11 33 09.58 V C57
2021-10-17 02:23:56 s 1 +76555.825 0 +348504.37 3580.0 C57
2021-10-17 02:33:56 S 02 52 52.030 +11 32 57.52 V C57
2021-10-17 02:33:56 s 1 +76210.749 0 +348726.47 350.0 C57
2021-10-17 03:43:56 S 02 52 51.043 +11 31 51.49 V C57
2021-10-17 03:43:56 s 1 +73788.568 0 +350250.44 6840.0 C57
2021-10-17 04:03:56 S 02 52 50.738 +11 31 32.38 V C57
2021-10-17 04:03:56 s 1 +73094.421 0 +350676.01 7820.0 C57
2021-10-17 04:13:56 S 02 52 50.854 +11 31 20.50 V C57
2021-10-17 04:13:56 s 1 +72747.004 0 +350887.15 7240.0 C57
2021-10-17 04:33:56 S 02 52 50.544 +11 31 02.60 V C57
2021-10-17 04:33:56 s 1 +72051.493 0 +351306.16 3950.0 C57
2021-10-17 05:33:56 S 02 52 49.735 +11 30 06.01 V C57
2021-10-17 05:33:56 s 1 +69959.625 0 +352537.00 7420.0 C57
2021-10-17 06:03:56 S 02 52 49.368 +11 29 36.67 V C57
2021-10-17 06:03:56 s 1 +68910.754 0 +353137.72 5000.0 C57
2021-10-17 07:13:56 S 02 52 48.643 +11 28 27.98 V C57
2021-10-17 07:13:56 s 1 +66456.016 0 +354501.35 9780.0 C57
2021-10-17 08:03:56 S 02 52 48.024 +11 27 39.60 V C57
2021-10-17 08:03:56 s 1 +64696.504 0 +355442.84 7080.0 C57
2021-10-17 09:13:56 S 02 52 47.230 +11 26 33.00 V C57
2021-10-17 09:13:56 s 1 +62224.941 0 +356715.50 9920.0 C57
2021-10-17 09:23:56 S 02 52 47.105 +11 26 23.57 V C57
2021-10-17 09:23:56 s 1 +61871.097 0 +356892.98 9410.0 C57
2021-10-17 10:33:56 S 02 52 46.298 +11 25 13.01 V C57
2021-10-17 10:33:56 s 1 +59389.016 0 +358105.22 40.0 C57
2021-10-17 10:53:56 S 02 52 46.008 +11 24 52.52 V C57
2021-10-17 10:53:56 s 1 +58678.223 0 +358441.88 9550.0 C57
2021-10-17 11:13:56 S 02 52 45.610 +11 24 36.50 V C57
2021-10-17 11:13:56 s 1 +57966.726 0 +358774.25 6920.0 C57
2021-10-17 11:23:56 S 02 52 45.605 +11 24 24.23 V C57
2021-10-17 11:23:56 s 1 +57610.716 0 +358938.82 9820.0 C57
2021-10-17 11:33:56 S 02 52 45.487 +11 24 15.91 V C57
2021-10-17 11:33:56 s 1 +57254.533 0 +359102.31 2190.0 C57
2021-10-17 11:43:56 S 02 52 45.377 +11 24 04.93 V C57
2021-10-17 11:43:56 s 1 +56898.179 0 +359264.74 4050.0 C57
2021-10-17 12:23:56 S 02 52 44.957 +11 23 26.74 V C57
2021-10-17 12:23:56 s 1 +55471.072 0 +359903.70 6370.0 C57
2021-10-17 12:33:56 S 02 52 44.822 +11 23 16.94 V C57
2021-10-17 12:33:56 s 1 +55113.878 0 +360060.76 5700.0 C57
2021-10-17 12:43:56 S 02 52 44.722 +11 23 06.83 V C57
2021-10-17 12:43:56 s 1 +54756.521 0 +360216.75 4530.0 C57
2021-10-17 12:53:56 S 02 52 44.594 +11 22 56.17 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)