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 21:13:56 S 02 52 42.881 +05 23 32.17 V C57
2021-10-28 21:13:56 s 1 +133162.84 2 +300964.62 3520.0 C57
2021-10-28 21:23:56 S 02 52 42.370 +05 23 11.62 V C57
2021-10-28 21:23:56 s 1 +132883.12 4 +301365.84 4670.0 C57
2021-10-28 21:33:56 S 02 52 41.863 +05 22 51.85 V C57
2021-10-28 21:33:56 s 1 +132602.88 9 +301765.88 4140.0 C57
2021-10-28 21:43:56 S 02 52 41.342 +05 22 30.14 V C57
2021-10-28 21:43:56 s 1 +132322.14 1 +302164.74 1930.0 C57
2021-10-28 21:53:56 S 02 52 40.814 +05 22 09.84 V C57
2021-10-28 21:53:56 s 1 +132040.88 1 +302562.40 8040.0 C57
2021-10-28 22:03:56 S 02 52 40.332 +05 21 48.85 V C57
2021-10-28 22:03:56 s 1 +131759.11 2 +302958.88 2500.0 C57
2021-10-28 22:13:56 S 02 52 39.761 +05 21 27.50 V C57
2021-10-28 22:13:56 s 1 +131476.83 6 +303354.18 5300.0 C57
2021-10-28 22:23:56 S 02 52 39.233 +05 21 07.02 V C57
2021-10-28 22:23:56 s 1 +131194.05 5 +303748.29 6460.0 C57
2021-10-28 22:33:56 S 02 52 38.729 +05 20 45.74 V C57
2021-10-28 22:33:56 s 1 +130910.77 2 +304141.22 5970.0 C57
2021-10-28 22:43:56 S 02 52 38.232 +05 20 24.65 V C57
2021-10-28 22:43:56 s 1 +130626.98 8 +304532.97 3850.0 C57
2021-10-28 22:53:56 S 02 52 37.750 +05 20 03.84 V C57
2021-10-28 22:53:56 s 1 +130342.70 5 +304923.54 110.0 C57
2021-10-28 23:03:56 S 02 52 37.217 +05 19 43.61 V C57
2021-10-28 23:03:56 s 1 +130057.92 6 +305312.93 4750.0 C57
2021-10-28 23:13:56 S 02 52 36.682 +05 19 22.44 V C57
2021-10-28 23:13:56 s 1 +129772.65 4 +305701.14 7790.0 C57
2021-10-28 23:23:56 S 02 52 36.197 +05 19 00.62 V C57
2021-10-28 23:23:56 s 1 +129486.88 9 +306088.17 9210.0 C57
2021-10-28 23:33:56 S 02 52 35.671 +05 18 39.96 V C57
2021-10-28 23:33:56 s 1 +129200.63 5 +306474.02 9050.0 C57
2021-10-28 23:43:56 S 02 52 35.146 +05 18 19.12 V C57
2021-10-28 23:43:56 s 1 +128913.89 3 +306858.70 7290.0 C57
2021-10-28 23:53:56 S 02 52 34.577 +05 17 57.84 V C57
2021-10-28 23:53:56 s 1 +128626.66 6 +307242.21 3960.0 C57
2021-10-29 00:03:56 S 02 52 34.090 +05 17 38.04 V C57
2021-10-29 00:03:56 s 1 +128338.95 5 +307624.54 9050.0 C57
2021-10-29 00:13:56 S 02 52 33.595 +05 17 16.76 V C57
2021-10-29 00:13:56 s 1 +128050.76 3 +308005.69 2570.0 C57
2021-10-29 00:23:56 S 02 52 33.010 +05 16 56.06 V C57
2021-10-29 00:23:56 s 1 +127762.09 2 +308385.68 4540.0 C57
2021-10-29 01:23:56 S 02 52 29.928 +05 14 49.02 V C57
2021-10-29 01:23:56 s 1 +126020.11 9 +310641.01 3970.0 C57
2021-10-29 03:23:56 S 02 52 23.652 +05 10 35.04 V C57
2021-10-29 03:23:56 s 1 +122486.41 4 +315025.92 1200.0 C57
2021-10-29 03:33:56 S 02 52 23.172 +05 10 13.55 V C57
2021-10-29 03:33:56 s 1 +122189.02 6 +315383.80 4850.0 C57
2021-10-29 03:43:56 S 02 52 22.675 +05 09 52.24 V C57
2021-10-29 03:43:56 s 1 +121891.19 9 +315740.52 7080.0 C57
2021-10-29 03:53:56 S 02 52 22.085 +05 09 30.56 V C57
2021-10-29 03:53:56 s 1 +121592.93 5 +316096.09 7890.0 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)