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
2021-10-26 19:03:56 S 02 55 13.152 +06 55 45.77 V C57
2021-10-26 19:03:56 s 1 +178151.40 1 +120585.74 6050.0 C57
2021-10-26 19:13:56 S 02 55 12.761 +06 55 29.68 V C57
2021-10-26 19:13:56 s 1 +178213.09 8 +121402.08 6930.0 C57
2021-10-26 19:23:56 S 02 55 12.362 +06 55 12.79 V C57
2021-10-26 19:23:56 s 1 +178272.51 3 +122216.86 120.0 C57
2021-10-26 19:33:56 S 02 55 11.870 +06 54 57.42 V C57
2021-10-26 19:33:56 s 1 +178329.66 2 +123030.09 5660.0 C57
2021-10-26 19:43:56 S 02 55 11.402 +06 54 42.52 V C57
2021-10-26 19:43:56 s 1 +178384.55 7 +123841.76 3600.0 C57
2021-10-26 19:53:56 S 02 55 10.942 +06 54 25.20 V C57
2021-10-26 19:53:56 s 1 +178437.21 3 +124651.88 3980.0 C57
2021-10-26 20:23:56 S 02 55 09.590 +06 53 38.76 V C57
2021-10-26 20:23:56 s 1 +178581.88 5 +127072.88 300.0 C57
2021-10-26 20:33:56 S 02 55 09.067 +06 53 22.09 V C57
2021-10-26 20:33:56 s 1 +178625.72 3 +127876.77 950.0 C57
2021-10-26 20:43:56 S 02 55 08.693 +06 53 06.36 V C57
2021-10-26 20:43:56 s 1 +178667.39 0 +128679.11 4290.0 C57
2021-10-26 20:53:56 S 02 55 08.150 +06 52 50.20 V C57
2021-10-26 20:53:56 s 1 +178706.90 0 +129479.89 350.0 C57
2021-10-26 21:03:56 S 02 55 07.735 +06 52 35.15 V C57
2021-10-26 21:03:56 s 1 +178744.26 5 +130279.11 9180.0 C57
2021-10-26 21:13:56 S 02 55 07.296 +06 52 18.23 V C57
2021-10-26 21:13:56 s 1 +178779.50 0 +131076.78 830.0 C57
2021-10-26 21:23:56 S 02 55 06.878 +06 52 02.57 V C57
2021-10-26 21:23:56 s 1 +178812.61 7 +131872.89 5340.0 C57
2021-10-26 21:33:56 S 02 55 06.365 +06 51 47.02 V C57
2021-10-26 21:33:56 s 1 +178843.62 9 +132667.45 2760.0 C57
2021-10-26 21:43:56 S 02 55 05.878 +06 51 30.49 V C57
2021-10-26 21:43:56 s 1 +178872.54 8 +133460.45 3130.0 C57
2021-10-26 21:53:56 S 02 55 05.501 +06 51 15.01 V C57
2021-10-26 21:53:56 s 1 +178899.38 8 +134251.91 6500.0 C57
2021-10-26 22:03:56 S 02 55 05.021 +06 50 58.78 V C57
2021-10-26 22:03:56 s 1 +178924.16 1 +135041.80 2900.0 C57
2021-10-26 22:13:56 S 02 55 04.591 +06 50 41.14 V C57
2021-10-26 22:13:56 s 1 +178946.87 9 +135830.15 2380.0 C57
2021-10-26 22:23:56 S 02 55 04.042 +06 50 26.09 V C57
2021-10-26 22:23:56 s 1 +178967.55 6 +136616.94 4980.0 C57
2021-10-26 22:33:56 S 02 55 03.670 +06 50 09.31 V C57
2021-10-26 22:33:56 s 1 +178986.20 2 +137402.18 740.0 C57
2021-10-26 22:43:56 S 02 55 03.139 +06 49 52.82 V C57
2021-10-26 22:43:56 s 1 +179002.83 1 +138185.87 9710.0 C57
2021-10-26 22:53:56 S 02 55 02.714 +06 49 37.34 V C57
2021-10-26 22:53:56 s 1 +179017.45 3 +138968.01 1930.0 C57
2021-10-26 23:03:56 S 02 55 02.196 +06 49 22.01 V C57
2021-10-26 23:03:56 s 1 +179030.08 3 +139748.60 7430.0 C57
2021-10-26 23:13:56 S 02 55 01.786 +06 49 05.12 V C57
2021-10-26 23:13:56 s 1 +179040.73 0 +140527.64 6270.0 C57
2021-10-26 23:23:56 S 02 55 01.282 +06 48 48.71 V C57
2021-10-26 23:23:56 s 1 +179049.40 7 +141305.13 8460.0 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)