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 10:03:56 s 1 -94945.224 0 +333324.47 3830.0 C57
2021-10-20 10:13:56 S 02 52 15.127 +10 05 47.98 V C57
2021-10-20 10:13:56 s 1 -95274.958 0 +333034.36 2580.0 C57
2021-10-20 10:23:56 S 02 52 15.101 +10 05 35.84 V C57
2021-10-20 10:23:56 s 1 -95604.367 0 +332743.10 90.0 C57
2021-10-20 10:33:56 S 02 52 15.122 +10 05 21.95 V C57
2021-10-20 10:33:56 s 1 -95933.451 0 +332450.70 6380.0 C57
2021-10-20 10:43:56 S 02 52 15.007 +10 05 12.77 V C57
2021-10-20 10:43:56 s 1 -96262.207 0 +332157.15 1420.0 C57
2021-10-20 10:53:56 S 02 52 15.166 +10 04 58.30 V C57
2021-10-20 10:53:56 s 1 -96590.634 0 +331862.46 5220.0 C57
2021-10-20 11:03:56 S 02 52 15.216 +10 04 46.20 V C57
2021-10-20 11:03:56 s 1 -96918.730 0 +331566.63 7760.0 C57
2021-10-20 11:53:56 S 02 52 15.173 +10 03 45.25 V C57
2021-10-20 11:53:56 s 1 -98554.189 0 +330070.25 1520.0 C57
2021-10-20 12:03:56 S 02 52 15.055 +10 03 32.69 V C57
2021-10-20 12:03:56 s 1 -98880.265 0 +329767.52 6440.0 C57
2021-10-20 12:13:56 S 02 52 15.084 +10 03 19.94 V C57
2021-10-20 12:13:56 s 1 -99205.999 0 +329463.65 60.0 C57
2021-10-20 12:23:56 S 02 52 15.074 +10 03 07.74 V C57
2021-10-20 12:23:56 s 1 -99531.388 0 +329158.62 2390.0 C57
2021-10-20 12:33:56 S 02 52 15.127 +10 02 54.85 V C57
2021-10-20 12:33:56 s 1 -99856.432 0 +328852.44 3410.0 C57
2021-10-20 12:43:56 S 02 52 15.137 +10 02 43.55 V C57
2021-10-20 12:43:56 s 1 -100181.12 8 +328545.11 3120.0 C57
2021-10-20 12:53:56 S 02 52 15.110 +10 02 30.59 V C57
2021-10-20 12:53:56 s 1 -100505.47 5 +328236.63 1520.0 C57
2021-10-20 13:03:56 S 02 52 15.113 +10 02 18.20 V C57
2021-10-20 13:03:56 s 1 -100829.47 1 +327926.99 8590.0 C57
2021-10-20 13:13:56 S 02 52 15.060 +10 02 06.76 V C57
2021-10-20 13:13:56 s 1 -101153.11 5 +327616.19 4340.0 C57
2021-10-20 13:23:56 S 02 52 15.041 +10 01 53.69 V C57
2021-10-20 13:23:56 s 1 -101476.40 3 +327304.24 8750.0 C57
2021-10-20 13:33:56 S 02 52 15.110 +10 01 39.97 V C57
2021-10-20 13:33:56 s 1 -101799.33 6 +326991.14 1820.0 C57
2021-10-20 13:43:56 S 02 52 15.156 +10 01 29.50 V C57
2021-10-20 13:43:56 s 1 -102121.91 1 +326676.87 3540.0 C57
2021-10-20 13:53:56 S 02 52 15.173 +10 01 16.79 V C57
2021-10-20 13:53:56 s 1 -102444.12 7 +326361.45 3920.0 C57
2021-10-20 14:03:56 S 02 52 15.043 +10 01 03.61 V C57
2021-10-20 14:03:56 s 1 -102765.98 1 +326044.86 2930.0 C57
2021-10-20 14:13:56 S 02 52 15.062 +10 00 50.11 V C57
2021-10-20 14:13:56 s 1 -103087.47 2 +325727.12 580.0 C57
2021-10-20 14:23:56 S 02 52 15.120 +10 00 39.82 V C57
2021-10-20 14:23:56 s 1 -103408.59 9 +325408.21 6860.0 C57
2021-10-20 14:33:56 S 02 52 15.127 +10 00 28.58 V C57
2021-10-20 14:33:56 s 1 -103729.35 9 +325088.14 1770.0 C57
2021-10-20 14:43:56 S 02 52 15.192 +10 00 15.55 V C57
2021-10-20 14:43:56 s 1 -104049.75 0 +324766.91 5280.0 C57
2021-10-20 14:53:56 S 02 52 15.096 +10 00 02.63 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)