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
2021-10-28 01:23:56 S 02 53 44.314 +06 02 54.60 V C57
2021-10-28 01:23:56 s 1 +162021.75 9 +244424.02 9240.0 C57
2021-10-28 01:33:56 S 02 53 43.819 +06 02 34.84 V C57
2021-10-28 01:33:56 s 1 +161822.75 6 +244974.57 6490.0 C57
2021-10-28 01:53:56 S 02 53 42.830 +06 01 57.61 V C57
2021-10-28 01:53:56 s 1 +161422.13 9 +246071.68 2320.0 C57
2021-10-28 02:03:56 S 02 53 42.314 +06 01 38.06 V C57
2021-10-28 02:03:56 s 1 +161220.53 3 +246618.25 920.0 C57
2021-10-28 02:13:56 S 02 53 41.837 +06 01 19.38 V C57
2021-10-28 02:13:56 s 1 +161018.06 6 +247163.49 6680.0 C57
2021-10-28 02:23:56 S 02 53 41.287 +06 00 59.98 V C57
2021-10-28 02:23:56 s 1 +160814.74 3 +247707.41 9590.0 C57
2021-10-28 02:33:56 S 02 53 40.714 +06 00 41.18 V C57
2021-10-28 02:33:56 s 1 +160610.56 7 +248250.01 9670.0 C57
2021-10-28 02:43:56 S 02 53 40.229 +06 00 22.64 V C57
2021-10-28 02:43:56 s 1 +160405.54 3 +248791.28 6940.0 C57
2021-10-28 02:53:56 S 02 53 39.746 +06 00 03.06 V C57
2021-10-28 02:53:56 s 1 +160199.67 4 +249331.24 1410.0 C57
2021-10-28 03:03:56 S 02 53 39.228 +05 59 44.27 V C57
2021-10-28 03:03:56 s 1 +159992.96 5 +249869.88 3090.0 C57
2021-10-28 03:13:56 S 02 53 38.734 +05 59 25.04 V C57
2021-10-28 03:13:56 s 1 +159785.41 8 +250407.20 2000.0 C57
2021-10-28 03:23:56 S 02 53 38.203 +05 59 04.70 V C57
2021-10-28 03:23:56 s 1 +159577.03 9 +250943.20 8140.0 C57
2021-10-28 03:33:56 S 02 53 37.702 +05 58 46.13 V C57
2021-10-28 03:33:56 s 1 +159367.83 0 +251477.90 1540.0 C57
2021-10-28 03:43:56 S 02 53 37.099 +05 58 27.73 V C57
2021-10-28 03:43:56 s 1 +159157.79 5 +252011.28 2200.0 C57
2021-10-28 03:53:56 S 02 53 36.660 +05 58 08.04 V C57
2021-10-28 03:53:56 s 1 +158946.93 8 +252543.34 130.0 C57
2021-10-28 04:03:56 S 02 53 36.149 +05 57 49.86 V C57
2021-10-28 04:03:56 s 1 +158735.26 3 +253074.10 5350.0 C57
2021-10-28 04:13:56 S 02 53 35.597 +05 57 30.13 V C57
2021-10-28 04:13:56 s 1 +158522.77 4 +253603.55 7880.0 C57
2021-10-28 04:23:56 S 02 53 35.206 +05 57 10.15 V C57
2021-10-28 04:23:56 s 1 +158309.47 3 +254131.69 7720.0 C57
2021-10-28 04:33:56 S 02 53 34.613 +05 56 51.68 V C57
2021-10-28 04:33:56 s 1 +158095.36 6 +254658.53 4880.0 C57
2021-10-28 04:43:56 S 02 53 34.104 +05 56 31.81 V C57
2021-10-28 04:43:56 s 1 +157880.45 5 +255184.06 9380.0 C57
2021-10-28 04:53:56 S 02 53 33.523 +05 56 12.70 V C57
2021-10-28 04:53:56 s 1 +157664.74 4 +255708.29 1240.0 C57
2021-10-28 05:03:56 S 02 53 33.038 +05 55 53.83 V C57
2021-10-28 05:03:56 s 1 +157448.23 6 +256231.22 450.0 C57
2021-10-28 05:13:56 S 02 53 32.503 +05 55 34.50 V C57
2021-10-28 05:13:56 s 1 +157230.93 6 +256752.85 7050.0 C57
2021-10-28 05:23:56 S 02 53 32.026 +05 55 15.56 V C57
2021-10-28 05:23:56 s 1 +157012.84 6 +257273.17 1020.0 C57
2021-10-28 05:33:56 S 02 53 31.524 +05 54 55.55 V C57
2021-10-28 05:33:56 s 1 +156793.97 1 +257792.20 2400.0 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)