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
2021-10-20 05:53:56 s 1 -86601.111 0 +340208.18 2340.0 C57
2021-10-20 06:03:56 S 02 52 15.403 +10 10 52.79 V C57
2021-10-20 06:03:56 s 1 -86938.441 0 +339946.39 9990.0 C57
2021-10-20 06:13:56 S 02 52 15.331 +10 10 41.66 V C57
2021-10-20 06:13:56 s 1 -87275.485 0 +339683.48 6540.0 C57
2021-10-20 06:23:56 S 02 52 15.329 +10 10 28.96 V C57
2021-10-20 06:23:56 s 1 -87612.242 0 +339419.45 2000.0 C57
2021-10-20 06:33:56 S 02 52 15.343 +10 10 16.36 V C57
2021-10-20 06:33:56 s 1 -87948.711 0 +339154.28 6360.0 C57
2021-10-20 06:43:56 S 02 52 15.346 +10 10 05.56 V C57
2021-10-20 06:43:56 s 1 -88284.890 0 +338887.99 9620.0 C57
2021-10-20 06:53:56 S 02 52 15.290 +10 09 51.34 V C57
2021-10-20 06:53:56 s 1 -88620.778 0 +338620.57 1760.0 C57
2021-10-20 07:03:56 S 02 52 15.334 +10 09 38.12 V C57
2021-10-20 07:03:56 s 1 -88956.372 0 +338352.03 2780.0 C57
2021-10-20 07:13:56 S 02 52 15.242 +10 09 28.76 V C57
2021-10-20 07:13:56 s 1 -89291.673 0 +338082.35 2680.0 C57
2021-10-20 07:23:56 S 02 52 15.238 +10 09 17.24 V C57
2021-10-20 07:23:56 s 1 -89626.677 0 +337811.55 1450.0 C57
2021-10-20 07:33:56 S 02 52 15.286 +10 09 03.49 V C57
2021-10-20 07:33:56 s 1 -89961.384 0 +337539.61 9080.0 C57
2021-10-20 07:43:56 S 02 52 15.264 +10 08 50.35 V C57
2021-10-20 07:43:56 s 1 -90295.791 0 +337266.55 5580.0 C57
2021-10-20 07:53:56 S 02 52 15.276 +10 08 40.38 V C57
2021-10-20 07:53:56 s 1 -90629.898 0 +336992.35 930.0 C57
2021-10-20 08:03:56 S 02 52 15.247 +10 08 26.02 V C57
2021-10-20 08:03:56 s 1 -90963.703 0 +336717.02 5130.0 C57
2021-10-20 08:13:56 S 02 52 15.187 +10 08 14.89 V C57
2021-10-20 08:13:56 s 1 -91297.204 0 +336440.55 8180.0 C57
2021-10-20 08:23:56 S 02 52 15.216 +10 08 02.90 V C57
2021-10-20 08:23:56 s 1 -91630.400 0 +336162.96 60.0 C57
2021-10-20 08:33:56 S 02 52 15.286 +10 07 52.28 V C57
2021-10-20 08:33:56 s 1 -91963.289 0 +335884.23 780.0 C57
2021-10-20 08:43:56 S 02 52 15.118 +10 07 37.88 V C57
2021-10-20 08:43:56 s 1 -92295.870 0 +335604.36 330.0 C57
2021-10-20 08:53:56 S 02 52 15.185 +10 07 25.36 V C57
2021-10-20 08:53:56 s 1 -92628.141 0 +335323.36 8700.0 C57
2021-10-20 09:03:56 S 02 52 15.125 +10 07 15.17 V C57
2021-10-20 09:03:56 s 1 -92960.100 0 +335041.22 5880.0 C57
2021-10-20 09:13:56 S 02 52 15.082 +10 07 01.60 V C57
2021-10-20 09:13:56 s 1 -93291.746 0 +334757.94 1880.0 C57
2021-10-20 09:23:56 S 02 52 15.168 +10 06 48.17 V C57
2021-10-20 09:23:56 s 1 -93623.077 0 +334473.53 6680.0 C57
2021-10-20 09:33:56 S 02 52 15.192 +10 06 37.44 V C57
2021-10-20 09:33:56 s 1 -93954.092 0 +334187.97 280.0 C57
2021-10-20 09:43:56 S 02 52 15.154 +10 06 24.41 V C57
2021-10-20 09:43:56 s 1 -94284.790 0 +333901.28 2680.0 C57
2021-10-20 09:53:56 S 02 52 15.103 +10 06 13.03 V C57
2021-10-20 09:53:56 s 1 -94615.167 0 +333613.45 3860.0 C57
2021-10-20 10:03:56 S 02 52 15.096 +10 06 00.29 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)