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
2021-10-21 15:53:56 s 1 -146992.16 6 +262351.18 5730.0 C57
2021-10-21 16:03:56 S 02 52 22.798 +09 27 50.76 V C57
2021-10-21 16:03:56 s 1 -147231.10 8 +261841.36 9720.0 C57
2021-10-21 16:13:56 S 02 52 22.814 +09 27 36.58 V C57
2021-10-21 16:13:56 s 1 -147469.30 4 +261330.21 1010.0 C57
2021-10-21 16:23:56 S 02 52 22.958 +09 27 23.62 V C57
2021-10-21 16:23:56 s 1 -147706.74 9 +260817.73 9570.0 C57
2021-10-21 16:33:56 S 02 52 23.062 +09 27 10.30 V C57
2021-10-21 16:33:56 s 1 -147943.44 2 +260303.91 5410.0 C57
2021-10-21 16:43:56 S 02 52 23.045 +09 26 57.48 V C57
2021-10-21 16:43:56 s 1 -148179.37 8 +259788.75 8500.0 C57
2021-10-21 16:53:56 S 02 52 23.162 +09 26 45.46 V C57
2021-10-21 16:53:56 s 1 -148414.55 3 +259272.25 8830.0 C57
2021-10-21 17:03:56 S 02 52 23.400 +09 26 31.49 V C57
2021-10-21 17:03:56 s 1 -148648.96 5 +258754.41 6400.0 C57
2021-10-21 17:13:56 S 02 52 23.460 +09 26 19.00 V C57
2021-10-21 17:13:56 s 1 -148882.60 9 +258235.22 1180.0 C57
2021-10-21 17:23:56 S 02 52 23.640 +09 26 04.88 V C57
2021-10-21 17:23:56 s 1 -149115.48 2 +257714.69 3180.0 C57
2021-10-21 17:33:56 S 02 52 23.705 +09 25 51.10 V C57
2021-10-21 17:33:56 s 1 -149347.58 0 +257192.81 2360.0 C57
2021-10-21 17:43:56 S 02 52 23.916 +09 25 38.96 V C57
2021-10-21 17:43:56 s 1 -149578.90 0 +256669.59 8730.0 C57
2021-10-21 17:53:56 S 02 52 23.981 +09 25 25.61 V C57
2021-10-21 17:53:56 s 1 -149809.43 8 +256145.01 2270.0 C57
2021-10-21 18:03:56 S 02 52 23.990 +09 25 11.86 V C57
2021-10-21 18:03:56 s 1 -150039.19 0 +255619.09 2960.0 C57
2021-10-21 18:13:56 S 02 52 24.058 +09 25 00.34 V C57
2021-10-21 18:13:56 s 1 -150268.15 3 +255091.81 800.0 C57
2021-10-21 18:23:56 S 02 52 24.257 +09 24 45.72 V C57
2021-10-21 18:23:56 s 1 -150496.32 3 +254563.18 5770.0 C57
2021-10-21 18:33:56 S 02 52 24.324 +09 24 32.54 V C57
2021-10-21 18:33:56 s 1 -150723.69 5 +254033.20 7850.0 C57
2021-10-21 18:43:56 S 02 52 24.569 +09 24 18.40 V C57
2021-10-21 18:43:56 s 1 -150950.26 8 +253501.86 7040.0 C57
2021-10-21 18:53:56 S 02 52 24.554 +09 24 06.62 V C57
2021-10-21 18:53:56 s 1 -151176.03 6 +252969.15 3310.0 C57
2021-10-21 19:03:56 S 02 52 24.828 +09 23 52.51 V C57
2021-10-21 19:03:56 s 1 -151400.99 5 +252435.09 6670.0 C57
2021-10-21 19:13:56 S 02 52 24.890 +09 23 39.70 V C57
2021-10-21 19:13:56 s 1 -151625.14 3 +251899.67 7090.0 C57
2021-10-21 19:23:56 S 02 52 24.917 +09 23 27.60 V C57
2021-10-21 19:23:56 s 1 -151848.47 4 +251362.89 4560.0 C57
2021-10-21 19:33:56 S 02 52 24.994 +09 23 13.60 V C57
2021-10-21 19:33:56 s 1 -152070.98 6 +250824.74 9060.0 C57
2021-10-21 19:43:56 S 02 52 25.130 +09 23 03.37 V C57
2021-10-21 19:43:56 s 1 -152292.67 5 +250285.23 590.0 C57
2021-10-21 19:53:56 S 02 52 25.130 +09 22 46.49 V C57
2021-10-21 19:53:56 s 1 -152513.53 5 +249744.34 9130.0 C57
2021-10-21 20:03:56 S 02 52 25.346 +09 22 31.55 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)