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 11:13:56 s 1 +172383.48 8 +80479.078 1610.0 C57
2021-10-26 11:23:56 S 02 55 33.038 +07 07 28.52 V C57
2021-10-26 11:23:56 s 1 +172571.11 2 +81367.224 8420.0 C57
2021-10-26 11:30:16 C 02 54 51.178 +06 53 34.05 U F52
2021-10-26 11:33:56 S 02 55 32.546 +07 07 13.91 V C57
2021-10-26 11:33:56 s 1 +172755.61 8 +82253.898 4650.0 C57
2021-10-26 11:43:56 S 02 55 32.186 +07 06 57.78 V C57
2021-10-26 11:43:56 s 1 +172937.02 8 +83139.098 390.0 C57
2021-10-26 11:47:03 C 02 54 50.766 +06 53 06.51 U F52
2021-10-26 11:53:56 S 02 55 31.769 +07 06 43.67 V C57
2021-10-26 11:53:56 s 1 +173115.36 3 +84022.818 5700.0 C57
2021-10-26 12:03:51 C 02 54 50.357 +06 52 38.86 U F52
2021-10-26 12:03:56 S 02 55 31.332 +07 06 28.48 V C57
2021-10-26 12:03:56 s 1 +173290.64 4 +84905.055 670.0 C57
2021-10-26 12:13:56 S 02 55 30.934 +07 06 13.28 V C57
2021-10-26 12:13:56 s 1 +173462.89 3 +85785.806 5360.0 C57
2021-10-26 12:23:56 S 02 55 30.533 +07 05 59.78 V C57
2021-10-26 12:23:56 s 1 +173632.13 1 +86665.067 9850.0 C57
2021-10-26 12:33:56 S 02 55 30.170 +07 05 43.55 V C57
2021-10-26 12:33:56 s 1 +173798.37 8 +87542.835 4210.0 C57
2021-10-26 12:43:56 S 02 55 29.657 +07 05 29.15 V C57
2021-10-26 12:43:56 s 1 +173961.65 6 +88419.106 8510.0 C57
2021-10-26 12:53:56 S 02 55 29.246 +07 05 14.14 V C57
2021-10-26 12:53:56 s 1 +174121.98 4 +89293.876 2820.0 C57
2021-10-26 13:03:56 S 02 55 28.817 +07 04 59.84 V C57
2021-10-26 13:03:56 s 1 +174279.38 3 +90167.144 7210.0 C57
2021-10-26 13:13:56 S 02 55 28.459 +07 04 44.40 V C57
2021-10-26 13:13:56 s 1 +174433.87 2 +91038.906 1740.0 C57
2021-10-26 13:23:56 S 02 55 28.001 +07 04 29.96 V C57
2021-10-26 13:23:56 s 1 +174585.47 3 +91909.159 6500.0 C57
2021-10-26 13:29:57 C 02 54 48.32 +06 50 17.6 V T08
2021-10-26 13:33:56 S 02 55 27.578 +07 04 13.87 V C57
2021-10-26 13:33:56 s 1 +174734.20 4 +92777.900 1540.0 C57
2021-10-26 13:35:15 C 02 54 48.22 +06 50 08.7 V T08
2021-10-26 13:43:56 S 02 55 27.180 +07 03 58.68 V C57
2021-10-26 13:43:56 s 1 +174880.08 5 +93645.127 6930.0 C57
2021-10-26 13:50:07 C 02 54 47.90 +06 49 44.0 V T08
2021-10-26 13:53:56 S 02 55 26.686 +07 03 44.24 V C57
2021-10-26 13:53:56 s 1 +175023.13 5 +94510.837 2740.0 C57
2021-10-26 14:03:56 S 02 55 26.314 +07 03 28.12 V C57
2021-10-26 14:03:56 s 1 +175163.37 4 +95375.028 9040.0 C57
2021-10-26 14:09:04 C 02 54 47.52 +06 49 12.3 V T08
2021-10-26 14:13:56 S 02 55 25.884 +07 03 13.79 V C57
2021-10-26 14:13:56 s 1 +175300.82 0 +96237.698 5880.0 C57
2021-10-26 14:23:56 S 02 55 25.457 +07 02 59.10 V C57
2021-10-26 14:23:56 s 1 +175435.49 2 +97098.844 3340.0 C57
2021-10-26 14:33:56 S 02 55 25.087 +07 02 43.94 V C57
2021-10-26 14:33:56 s 1 +175567.40 9 +97958.463 1470.0 C57
2021-10-26 14:43:56 S 02 55 24.545 +07 02 28.50 V C57
2021-10-26 14:43:56 s 1 +175696.58 9 +98816.555 350.0 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)