IAA RAS IAA Minor Planet Database

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 09:23:56 S 02 52 31.481 +11 01 50.45 – V C57
2021-10-18 09:33:56 S 02 52 31.404 +11 01 42.17 – V C57
2021-10-18 09:53:56 S 02 52 31.202 +11 01 20.32 – V C57
2021-10-18 10:03:56 S 02 52 31.049 +11 01 09.08 – V C57
2021-10-18 10:13:56 S 02 52 31.027 +11 00 59.69 – V C57
2021-10-18 10:23:56 S 02 52 30.907 +11 00 48.64 – V C57
2021-10-18 10:33:56 S 02 52 30.732 +11 00 38.45 – V C57
2021-10-18 10:43:56 S 02 52 30.720 +11 00 25.52 – V C57
2021-10-18 10:53:56 S 02 52 30.691 +11 00 16.24 – V C57
2021-10-18 11:03:56 S 02 52 30.564 +11 00 05.90 – V C57
2021-10-18 11:13:56 S 02 52 30.319 +10 59 53.70 – V C57
2021-10-18 11:23:56 S 02 52 30.317 +10 59 45.28 – V C57
2021-10-18 11:33:56 S 02 52 30.163 +10 59 32.32 – V C57
2021-10-18 11:43:56 S 02 52 30.134 +10 59 21.19 – V C57
2021-10-18 11:53:56 S 02 52 30.149 +10 59 11.33 – V C57
2021-10-18 12:13:56 S 02 52 29.976 +10 58 48.94 – V C57
2021-10-18 12:23:56 S 02 52 29.909 +10 58 39.18 – V C57
2021-10-18 12:43:56 S 02 52 29.597 +10 58 19.02 – V C57
2021-10-18 12:53:56 S 02 52 29.539 +10 58 06.92 – V C57
2021-10-18 13:23:56 S 02 52 29.318 +10 57 35.10 – V C57
2021-10-18 13:33:56 S 02 52 29.237 +10 57 22.97 – V C57
2021-10-18 13:53:56 S 02 52 29.062 +10 57 02.77 – V C57
2021-10-18 14:03:56 S 02 52 28.930 +10 56 51.50 – V C57
2021-10-18 14:13:56 S 02 52 28.754 +10 56 39.77 – V C57
2021-10-18 14:23:56 S 02 52 28.716 +10 56 30.26 – V C57
2021-10-18 14:33:56 S 02 52 28.596 +10 56 17.02 – V C57
2021-10-18 14:43:56 S 02 52 28.534 +10 56 09.46 – V C57
2021-10-18 14:53:56 S 02 52 28.476 +10 55 57.47 – V C57
2021-10-18 15:03:56 S 02 52 28.409 +10 55 46.70 – V C57
2021-10-18 15:13:56 S 02 52 28.294 +10 55 34.97 – V C57
2021-10-18 15:23:56 S 02 52 28.286 +10 55 24.10 – V C57
2021-10-18 15:33:56 S 02 52 28.171 +10 55 14.12 – V C57
2021-10-18 15:43:56 S 02 52 28.092 +10 55 03.79 – V C57
2021-10-18 15:53:56 S 02 52 27.893 +10 54 52.99 – V C57
2021-10-18 16:03:56 S 02 52 27.888 +10 54 40.54 – V C57
2021-10-18 16:13:56 S 02 52 27.797 +10 54 31.93 – V C57
2021-10-18 16:23:56 S 02 52 27.710 +10 54 19.55 – V C57
2021-10-18 16:33:56 S 02 52 27.703 +10 54 08.86 – V C57
2021-10-18 16:43:56 S 02 52 27.566 +10 53 57.12 – V C57
2021-10-18 16:53:56 S 02 52 27.406 +10 53 46.32 – V C57
2021-10-18 17:03:56 S 02 52 27.302 +10 53 36.78 – V C57
2021-10-18 17:13:56 S 02 52 27.283 +10 53 24.86 – V C57
2021-10-18 17:23:56 S 02 52 27.156 +10 53 14.89 – V C57
2021-10-18 17:33:56 S 02 52 27.139 +10 53 03.26 – V C57
2021-10-18 17:43:56 S 02 52 27.067 +10 52 51.38 – V C57
2021-10-18 17:53:56 S 02 52 26.947 +10 52 40.15 – V C57
2021-10-18 18:03:56 S 02 52 26.904 +10 52 28.06 – V C57
2021-10-18 18:13:56 S 02 52 26.866 +10 52 20.32 – V C57
2021-10-18 18:13:56 s 1 -10031.245 0 +371180.94 4530.0 – C57
2021-10-18 18:23:56 S 02 52 26.630 +10 52 08.90 – 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)