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
2021-10-18 18:23:56 s 1 -10400.318 0 +371149.47 2100.0 C57
2021-10-18 18:33:56 S 02 52 26.496 +10 51 57.13 V C57
2021-10-18 18:33:56 s 1 -10769.363 0 +371116.96 9490.0 C57
2021-10-18 18:43:56 S 02 52 26.448 +10 51 47.41 V C57
2021-10-18 18:43:56 s 1 -11138.378 0 +371083.40 6690.0 C57
2021-10-18 18:53:56 S 02 52 26.472 +10 51 34.24 V C57
2021-10-18 18:53:56 s 1 -11507.363 0 +371048.79 3710.0 C57
2021-10-18 19:03:56 S 02 52 26.345 +10 51 26.03 V C57
2021-10-18 19:03:56 s 1 -11876.317 0 +371013.13 530.0 C57
2021-10-18 19:13:56 S 02 52 26.232 +10 51 11.45 V C57
2021-10-18 19:13:56 s 1 -12245.238 0 +370976.42 7150.0 C57
2021-10-18 19:23:56 S 02 52 26.136 +10 51 02.38 V C57
2021-10-18 19:23:56 s 1 -12614.125 0 +370938.67 3570.0 C57
2021-10-18 19:33:56 S 02 52 26.186 +10 50 49.92 V C57
2021-10-18 19:33:56 s 1 -12982.978 0 +370899.86 9780.0 C57
2021-10-18 19:43:56 S 02 52 26.112 +10 50 39.88 V C57
2021-10-18 19:43:56 s 1 -13351.795 0 +370860.01 5790.0 C57
2021-10-18 19:53:56 S 02 52 25.898 +10 50 31.88 V C57
2021-10-18 19:53:56 s 1 -13720.575 0 +370819.11 1580.0 C57
2021-10-18 20:03:56 S 02 52 25.817 +10 50 19.75 V C57
2021-10-18 20:03:56 s 1 -14089.318 0 +370777.16 7160.0 C57
2021-10-18 20:13:56 S 02 52 25.774 +10 50 07.40 V C57
2021-10-18 20:13:56 s 1 -14458.022 0 +370734.16 2520.0 C57
2021-10-18 20:23:56 S 02 52 25.598 +10 49 56.17 V C57
2021-10-18 20:23:56 s 1 -14826.686 0 +370690.11 7650.0 C57
2021-10-18 20:33:56 S 02 52 25.682 +10 49 44.87 V C57
2021-10-18 20:33:56 s 1 -15195.309 0 +370645.01 2560.0 C57
2021-10-18 20:43:56 S 02 52 25.478 +10 49 34.97 V C57
2021-10-18 20:43:56 s 1 -15563.890 0 +370598.87 7230.0 C57
2021-10-18 20:53:56 S 02 52 25.411 +10 49 22.58 V C57
2021-10-18 20:53:56 s 1 -15932.428 0 +370551.67 1680.0 C57
2021-10-18 21:03:56 S 02 52 25.426 +10 49 10.70 V C57
2021-10-18 21:03:56 s 1 -16300.923 0 +370503.42 5880.0 C57
2021-10-18 21:13:56 S 02 52 25.344 +10 49 01.31 V C57
2021-10-18 21:13:56 s 1 -16669.372 0 +370454.12 9840.0 C57
2021-10-18 21:23:56 S 02 52 25.159 +10 48 50.94 V C57
2021-10-18 21:23:56 s 1 -17037.775 0 +370403.78 3550.0 C57
2021-10-18 21:53:56 S 02 52 25.015 +10 48 17.50 V C57
2021-10-18 21:53:56 s 1 -18142.696 0 +370246.44 3180.0 C57
2021-10-18 22:03:56 S 02 52 24.953 +10 48 06.48 V C57
2021-10-18 22:03:56 s 1 -18510.904 0 +370191.89 5870.0 C57
2021-10-18 22:13:56 S 02 52 24.799 +10 47 56.54 V C57
2021-10-18 22:13:56 s 1 -18879.061 0 +370136.29 8300.0 C57
2021-10-18 22:23:56 S 02 52 24.658 +10 47 43.04 V C57
2021-10-18 22:23:56 s 1 -19247.165 0 +370079.64 460.0 C57
2021-10-18 22:33:56 S 02 52 24.619 +10 47 33.22 V C57
2021-10-18 22:33:56 s 1 -19615.216 0 +370021.94 2350.0 C57
2021-10-18 22:43:56 S 02 52 24.641 +10 47 23.32 V C57
2021-10-18 22:43:56 s 1 -19983.212 0 +369963.19 3970.0 C57
2021-10-18 22:53:56 S 02 52 24.480 +10 47 10.10 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)