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
2021-10-14 20:13:56 s 1 +165466.89 1 +213546.59 660.0 C57
2021-10-14 20:23:56 S 02 53 35.782 +12 18 36.07 V C57
2021-10-14 20:23:56 s 1 +165309.80 9 +214173.37 9020.0 C57
2021-10-14 20:33:56 S 02 53 35.702 +12 18 26.10 V C57
2021-10-14 20:33:56 s 1 +165151.59 8 +214798.69 3590.0 C57
2021-10-14 20:43:56 S 02 53 35.659 +12 18 22.18 V C57
2021-10-14 20:43:56 s 1 +164992.26 5 +215422.55 4410.0 C57
2021-10-14 20:53:56 S 02 53 35.554 +12 18 13.03 V C57
2021-10-14 20:53:56 s 1 +164831.81 5 +216044.95 1490.0 C57
2021-10-14 21:03:56 S 02 53 35.239 +12 18 06.70 V C57
2021-10-14 21:03:56 s 1 +164670.25 3 +216665.90 4840.0 C57
2021-10-14 21:13:56 S 02 53 35.184 +12 17 59.64 V C57
2021-10-14 21:13:56 s 1 +164507.58 4 +217285.39 4500.0 C57
2021-10-14 21:23:56 S 02 53 35.052 +12 17 51.68 V C57
2021-10-14 21:23:56 s 1 +164343.81 6 +217903.42 470.0 C57
2021-10-14 21:33:56 S 02 53 34.865 +12 17 45.02 V C57
2021-10-14 21:33:56 s 1 +164178.95 3 +218520.01 2780.0 C57
2021-10-14 21:43:56 S 02 53 34.901 +12 17 38.04 V C57
2021-10-14 21:43:56 s 1 +164013.00 0 +219135.15 1440.0 C57
2021-10-14 21:53:56 S 02 53 34.663 +12 17 32.57 V C57
2021-10-14 21:53:56 s 1 +163845.96 4 +219748.84 6480.0 C57
2021-10-14 22:03:56 S 02 53 34.442 +12 17 20.47 V C57
2021-10-14 22:03:56 s 1 +163677.84 9 +220361.08 7900.0 C57
2021-10-14 22:13:56 S 02 53 34.358 +12 17 15.18 V C57
2021-10-14 22:13:56 s 1 +163508.66 1 +220971.88 5740.0 C57
2021-10-14 22:23:56 S 02 53 34.243 +12 17 07.84 V C57
2021-10-14 22:23:56 s 1 +163338.40 5 +221581.24 0.0 C57
2021-10-14 22:33:56 S 02 53 34.116 +12 16 59.92 V C57
2021-10-14 22:33:56 s 1 +163167.08 7 +222189.16 710.0 C57
2021-10-14 22:43:56 S 02 53 33.922 +12 16 52.36 V C57
2021-10-14 22:43:56 s 1 +162994.71 1 +222795.64 7880.0 C57
2021-10-14 22:53:56 S 02 53 33.946 +12 16 48.25 V C57
2021-10-14 22:53:56 s 1 +162821.28 4 +223400.68 1530.0 C57
2021-10-14 23:03:56 S 02 53 33.682 +12 16 38.96 V C57
2021-10-14 23:03:56 s 1 +162646.81 0 +224004.28 1680.0 C57
2021-10-14 23:13:56 S 02 53 33.593 +12 16 30.50 V C57
2021-10-14 23:13:56 s 1 +162471.29 5 +224606.46 8350.0 C57
2021-10-14 23:23:56 S 02 53 33.449 +12 16 23.02 V C57
2021-10-14 23:23:56 s 1 +162294.74 3 +225207.20 1550.0 C57
2021-10-14 23:33:56 S 02 53 33.276 +12 16 15.67 V C57
2021-10-14 23:33:56 s 1 +162117.16 0 +225806.51 1300.0 C57
2021-10-14 23:43:56 S 02 53 33.146 +12 16 11.60 V C57
2021-10-14 23:43:56 s 1 +161938.55 1 +226404.39 7620.0 C57
2021-10-14 23:53:56 S 02 53 32.810 +12 16 01.09 V C57
2021-10-14 23:53:56 s 1 +161758.92 1 +227000.84 520.0 C57
2021-10-15 00:13:56 S 02 53 32.815 +12 15 46.91 V C57
2021-10-15 00:13:56 s 1 +161396.61 8 +228189.48 6150.0 C57
2021-10-15 00:23:56 S 02 53 32.568 +12 15 41.80 V C57
2021-10-15 00:23:56 s 1 +161213.95 5 +228781.66 8910.0 C57
2021-10-15 01:03:56 S 02 53 32.069 +12 15 08.96 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)