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
2021-10-15 01:03:56 s 1 +160473.34 1 +231136.21 6650.0 C57
2021-10-15 01:23:56 S 02 53 31.826 +12 14 56.80 V C57
2021-10-15 01:23:56 s 1 +160097.12 4 +232305.00 5760.0 C57
2021-10-15 01:33:56 S 02 53 31.721 +12 14 49.38 V C57
2021-10-15 01:33:56 s 1 +159907.55 5 +232887.27 5430.0 C57
2021-10-15 01:43:56 S 02 53 31.414 +12 14 42.25 V C57
2021-10-15 01:43:56 s 1 +159717.01 9 +233468.14 1870.0 C57
2021-10-15 01:53:56 S 02 53 31.346 +12 14 32.64 V C57
2021-10-15 01:53:56 s 1 +159525.52 0 +234047.61 5090.0 C57
2021-10-15 02:03:56 S 02 53 31.145 +12 14 26.52 V C57
2021-10-15 02:03:56 s 1 +159333.06 2 +234625.66 5110.0 C57
2021-10-15 02:13:56 S 02 53 31.054 +12 14 16.04 V C57
2021-10-15 02:13:56 s 1 +159139.65 2 +235202.32 1950.0 C57
2021-10-15 02:23:56 S 02 53 31.097 +12 14 09.71 V C57
2021-10-15 02:23:56 s 1 +158945.29 2 +235777.57 5610.0 C57
2021-10-15 02:33:56 S 02 53 30.953 +12 14 04.06 V C57
2021-10-15 02:33:56 s 1 +158749.98 9 +236351.42 6120.0 C57
2021-10-15 02:43:56 S 02 53 30.701 +12 13 56.03 V C57
2021-10-15 02:43:56 s 1 +158553.74 5 +236923.88 3490.0 C57
2021-10-15 03:03:56 S 02 53 30.466 +12 13 41.77 V C57
2021-10-15 03:03:56 s 1 +158158.45 7 +238064.60 8860.0 C57
2021-10-15 03:13:56 S 02 53 30.206 +12 13 34.72 V C57
2021-10-15 03:13:56 s 1 +157959.42 2 +238632.86 6910.0 C57
2021-10-15 03:23:56 S 02 53 30.158 +12 13 25.18 V C57
2021-10-15 03:23:56 s 1 +157759.46 5 +239199.74 1870.0 C57
2021-10-15 03:33:56 S 02 53 29.918 +12 13 16.86 V C57
2021-10-15 03:33:56 s 1 +157558.59 1 +239765.22 3770.0 C57
2021-10-15 03:43:56 S 02 53 29.911 +12 13 07.54 V C57
2021-10-15 03:43:56 s 1 +157356.80 3 +240329.32 2610.0 C57
2021-10-15 04:03:56 S 02 53 29.575 +12 12 55.33 V C57
2021-10-15 04:03:56 s 1 +156950.50 8 +241453.36 1220.0 C57
2021-10-15 04:13:56 S 02 53 29.378 +12 12 48.17 V C57
2021-10-15 04:13:56 s 1 +156746.00 8 +242013.30 1010.0 C57
2021-10-15 04:23:56 S 02 53 29.330 +12 12 39.82 V C57
2021-10-15 04:23:56 s 1 +156540.61 2 +242571.85 7810.0 C57
2021-10-15 04:33:56 S 02 53 29.064 +12 12 31.18 V C57
2021-10-15 04:33:56 s 1 +156334.32 5 +243129.03 1630.0 C57
2021-10-15 04:43:56 S 02 53 29.059 +12 12 24.08 V C57
2021-10-15 04:43:56 s 1 +156127.15 2 +243684.83 2500.0 C57
2021-10-15 04:53:56 S 02 53 28.934 +12 12 15.88 V C57
2021-10-15 04:53:56 s 1 +155919.09 5 +244239.25 410.0 C57
2021-10-15 05:03:56 S 02 53 28.771 +12 12 08.03 V C57
2021-10-15 05:03:56 s 1 +155710.15 9 +244792.29 5390.0 C57
2021-10-15 05:13:56 S 02 53 28.584 +12 12 01.55 V C57
2021-10-15 05:13:56 s 1 +155500.35 0 +245343.96 7450.0 C57
2021-10-15 05:23:56 S 02 53 28.397 +12 11 55.25 V C57
2021-10-15 05:23:56 s 1 +155289.66 9 +245894.26 6610.0 C57
2021-10-15 05:33:56 S 02 53 28.188 +12 11 49.09 V C57
2021-10-15 05:33:56 s 1 +155078.12 3 +246443.19 2870.0 C57
2021-10-15 05:43:56 S 02 53 28.032 +12 11 38.98 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)