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
2021-10-22 00:13:56 s 1 -157952.06 0 +235196.34 5040.0 C57
2021-10-22 00:23:56 S 02 52 28.812 +09 16 47.64 V C57
2021-10-22 00:23:56 s 1 -158149.01 0 +234617.95 7400.0 C57
2021-10-22 00:33:56 S 02 52 29.006 +09 16 34.46 V C57
2021-10-22 00:33:56 s 1 -158345.01 4 +234038.14 6350.0 C57
2021-10-22 00:43:56 S 02 52 29.078 +09 16 21.47 V C57
2021-10-22 00:43:56 s 1 -158540.06 6 +233456.92 1870.0 C57
2021-10-22 00:53:56 S 02 52 29.273 +09 16 09.12 V C57
2021-10-22 00:53:56 s 1 -158734.16 2 +232874.28 3960.0 C57
2021-10-22 01:03:56 S 02 52 29.311 +09 15 57.20 V C57
2021-10-22 01:03:56 s 1 -158927.29 7 +232290.23 2600.0 C57
2021-10-22 01:13:56 S 02 52 29.508 +09 15 42.80 V C57
2021-10-22 01:13:56 s 1 -159119.46 7 +231704.76 7760.0 C57
2021-10-22 01:23:56 S 02 52 29.594 +09 15 28.58 V C57
2021-10-22 01:23:56 s 1 -159310.66 6 +231117.86 9430.0 C57
2021-10-22 01:33:56 S 02 52 29.878 +09 15 15.62 V C57
2021-10-22 01:33:56 s 1 -159500.88 9 +230529.55 7610.0 C57
2021-10-22 01:43:56 S 02 52 29.990 +09 15 01.01 V C57
2021-10-22 01:43:56 s 1 -159690.13 3 +229939.81 2260.0 C57
2021-10-22 01:53:56 S 02 52 30.029 +09 14 48.52 V C57
2021-10-22 01:53:56 s 1 -159878.39 2 +229348.65 3370.0 C57
2021-10-22 02:03:56 S 02 52 30.288 +09 14 35.84 V C57
2021-10-22 02:03:56 s 1 -160065.66 2 +228756.06 930.0 C57
2021-10-22 02:13:56 S 02 52 30.473 +09 14 22.78 V C57
2021-10-22 02:13:56 s 1 -160251.93 6 +228162.04 4920.0 C57
2021-10-22 02:23:56 S 02 52 30.518 +09 14 08.88 V C57
2021-10-22 02:23:56 s 1 -160437.21 1 +227566.59 5320.0 C57
2021-10-22 02:33:56 S 02 52 30.761 +09 13 56.10 V C57
2021-10-22 02:33:56 s 1 -160621.48 2 +226969.71 2110.0 C57
2021-10-22 02:43:56 S 02 52 30.816 +09 13 42.56 V C57
2021-10-22 02:43:56 s 1 -160804.74 3 +226371.40 5280.0 C57
2021-10-22 02:53:56 S 02 52 30.994 +09 13 29.03 V C57
2021-10-22 02:53:56 s 1 -160986.99 0 +225771.65 4810.0 C57
2021-10-22 03:03:56 S 02 52 31.236 +09 13 15.31 V C57
2021-10-22 03:03:56 s 1 -161168.21 7 +225170.46 680.0 C57
2021-10-22 03:13:56 S 02 52 31.378 +09 13 02.46 V C57
2021-10-22 03:13:56 s 1 -161348.41 9 +224567.83 2870.0 C57
2021-10-22 03:23:56 S 02 52 31.625 +09 12 49.39 V C57
2021-10-22 03:23:56 s 1 -161527.59 2 +223963.77 1370.0 C57
2021-10-22 03:33:56 S 02 52 31.658 +09 12 35.35 V C57
2021-10-22 03:33:56 s 1 -161705.72 9 +223358.26 6160.0 C57
2021-10-22 03:43:56 S 02 52 31.889 +09 12 23.65 V C57
2021-10-22 03:43:56 s 1 -161882.82 7 +222751.31 7220.0 C57
2021-10-22 03:53:56 S 02 52 31.908 +09 12 07.60 V C57
2021-10-22 03:53:56 s 1 -162058.87 9 +222142.91 4530.0 C57
2021-10-22 04:03:56 S 02 52 32.136 +09 11 57.44 V C57
2021-10-22 04:03:56 s 1 -162233.88 0 +221533.06 8070.0 C57
2021-10-22 04:13:56 S 02 52 32.249 +09 11 43.48 V C57
2021-10-22 04:13:56 s 1 -162407.82 6 +220921.77 7830.0 C57
2021-10-22 04:23:56 S 02 52 32.383 +09 11 29.90 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)