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 07:13:56 S 02 55 42.746 +07 13 30.18 V C57
2021-10-26 07:13:56 s 1 +166884.54 4 +58735.552 8600.0 C57
2021-10-26 07:23:56 S 02 55 42.430 +07 13 15.96 V C57
2021-10-26 07:23:56 s 1 +167154.11 6 +59657.372 3620.0 C57
2021-10-26 07:33:56 S 02 55 42.125 +07 13 00.80 V C57
2021-10-26 07:33:56 s 1 +167419.98 0 +60577.868 6030.0 C57
2021-10-26 07:43:56 S 02 55 41.712 +07 12 47.09 V C57
2021-10-26 07:43:56 s 1 +167682.16 2 +61497.032 5930.0 C57
2021-10-26 07:53:56 S 02 55 41.345 +07 12 33.05 V C57
2021-10-26 07:53:56 s 1 +167940.69 1 +62414.855 3410.0 C57
2021-10-26 08:03:56 S 02 55 40.896 +07 12 19.15 V C57
2021-10-26 08:03:56 s 1 +168195.59 2 +63331.330 8570.0 C57
2021-10-26 08:13:56 S 02 55 40.519 +07 12 03.82 V C57
2021-10-26 08:13:56 s 1 +168446.89 3 +64246.448 1490.0 C57
2021-10-26 08:23:56 S 02 55 40.193 +07 11 50.46 V C57
2021-10-26 08:23:56 s 1 +168694.62 0 +65160.203 2260.0 C57
2021-10-26 08:33:56 S 02 55 39.626 +07 11 35.41 V C57
2021-10-26 08:33:56 s 1 +168938.79 9 +66072.587 980.0 C57
2021-10-26 08:43:56 S 02 55 39.377 +07 11 21.59 V C57
2021-10-26 08:43:56 s 1 +169179.45 5 +66983.593 7740.0 C57
2021-10-26 08:53:56 S 02 55 38.954 +07 11 06.72 V C57
2021-10-26 08:53:56 s 1 +169416.61 5 +67893.214 2630.0 C57
2021-10-26 09:03:56 S 02 55 38.611 +07 10 52.79 V C57
2021-10-26 09:03:56 s 1 +169650.30 4 +68801.443 5720.0 C57
2021-10-26 09:13:56 S 02 55 38.246 +07 10 37.45 V C57
2021-10-26 09:13:56 s 1 +169880.54 7 +69708.274 7120.0 C57
2021-10-26 09:23:56 S 02 55 37.874 +07 10 24.13 V C57
2021-10-26 09:23:56 s 1 +170107.36 8 +70613.701 6900.0 C57
2021-10-26 09:33:56 S 02 55 37.339 +07 10 12.07 V C57
2021-10-26 09:33:56 s 1 +170330.79 3 +71517.717 5150.0 C57
2021-10-26 09:43:56 S 02 55 37.145 +07 09 55.80 V C57
2021-10-26 09:43:56 s 1 +170550.84 5 +72420.317 1950.0 C57
2021-10-26 09:53:56 S 02 55 36.612 +07 09 38.88 V C57
2021-10-26 09:53:56 s 1 +170767.55 0 +73321.495 7390.0 C57
2021-10-26 10:03:56 S 02 55 36.180 +07 09 25.45 V C57
2021-10-26 10:03:56 s 1 +170980.93 0 +74221.244 1550.0 C57
2021-10-26 10:13:56 S 02 55 35.777 +07 09 10.84 V C57
2021-10-26 10:13:56 s 1 +171191.01 1 +75119.561 4510.0 C57
2021-10-26 10:23:56 S 02 55 35.366 +07 08 55.54 V C57
2021-10-26 10:23:56 s 1 +171397.81 4 +76016.439 6360.0 C57
2021-10-26 10:33:56 S 02 55 34.978 +07 08 42.40 V C57
2021-10-26 10:33:56 s 1 +171601.36 4 +76911.873 7170.0 C57
2021-10-26 10:43:56 S 02 55 34.632 +07 08 25.87 V C57
2021-10-26 10:43:56 s 1 +171801.68 4 +77805.859 7020.0 C57
2021-10-26 10:53:56 S 02 55 34.190 +07 08 11.98 V C57
2021-10-26 10:53:56 s 1 +171998.79 6 +78698.392 5990.0 C57
2021-10-26 11:03:56 S 02 55 33.823 +07 07 56.96 V C57
2021-10-26 11:03:56 s 1 +172192.72 3 +79589.466 4170.0 C57
2021-10-26 11:13:28 C 02 54 51.596 +06 54 01.59 U F52
2021-10-26 11:13:56 S 02 55 33.377 +07 07 43.03 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)