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 16:53:56 s 1 -172077.36 3 +170091.39 7140.0 C57
2021-10-22 17:03:56 S 02 52 48.012 +08 54 24.55 V C57
2021-10-22 17:03:56 s 1 -172150.91 9 +169363.31 9300.0 C57
2021-10-22 17:13:56 S 02 52 48.254 +08 54 11.30 V C57
2021-10-22 17:13:56 s 1 -172222.87 2 +168633.64 5780.0 C57
2021-10-22 17:23:56 S 02 52 48.475 +08 53 58.92 V C57
2021-10-22 17:23:56 s 1 -172293.21 5 +167902.39 6560.0 C57
2021-10-22 17:33:56 S 02 52 48.850 +08 53 44.05 V C57
2021-10-22 17:33:56 s 1 -172361.93 7 +167169.56 1590.0 C57
2021-10-22 17:53:56 S 02 52 49.409 +08 53 17.09 V C57
2021-10-22 17:53:56 s 1 -172494.48 2 +165699.12 4310.0 C57
2021-10-22 18:03:56 S 02 52 49.738 +08 53 03.44 V C57
2021-10-22 18:03:56 s 1 -172558.28 5 +164961.51 1920.0 C57
2021-10-22 18:23:56 S 02 52 50.201 +08 52 36.05 V C57
2021-10-22 18:23:56 s 1 -172680.90 8 +163481.52 9510.0 C57
2021-10-22 18:33:56 S 02 52 50.434 +08 52 21.29 V C57
2021-10-22 18:33:56 s 1 -172739.70 8 +162739.14 9410.0 C57
2021-10-22 18:43:56 S 02 52 50.738 +08 52 08.54 V C57
2021-10-22 18:43:56 s 1 -172796.82 0 +161995.15 3340.0 C57
2021-10-22 18:53:56 S 02 52 50.995 +08 51 55.30 V C57
2021-10-22 18:53:56 s 1 -172852.23 5 +161249.57 1260.0 C57
2021-10-22 19:03:56 S 02 52 51.161 +08 51 41.44 V C57
2021-10-22 19:03:56 s 1 -172905.94 3 +160502.39 3150.0 C57
2021-10-22 19:13:56 S 02 52 51.463 +08 51 29.12 V C57
2021-10-22 19:13:56 s 1 -172957.93 3 +159753.61 8960.0 C57
2021-10-22 19:23:56 S 02 52 51.900 +08 51 15.44 V C57
2021-10-22 19:23:56 s 1 -173008.19 5 +159003.23 8660.0 C57
2021-10-22 19:43:56 S 02 52 52.267 +08 50 47.15 V C57
2021-10-22 19:43:56 s 1 -173103.49 6 +157497.65 9580.0 C57
2021-10-22 19:53:56 S 02 52 52.596 +08 50 35.02 V C57
2021-10-22 19:53:56 s 1 -173148.51 5 +156742.44 740.0 C57
2021-10-22 20:03:56 S 02 52 52.819 +08 50 20.76 V C57
2021-10-22 20:03:56 s 1 -173191.76 4 +155985.64 5640.0 C57
2021-10-22 20:13:56 S 02 52 52.992 +08 50 06.36 V C57
2021-10-22 20:13:56 s 1 -173233.23 4 +155227.22 4260.0 C57
2021-10-22 20:23:56 S 02 52 53.366 +08 49 53.65 V C57
2021-10-22 20:23:56 s 1 -173272.91 4 +154467.19 6550.0 C57
2021-10-22 20:43:56 S 02 52 53.858 +08 49 25.14 V C57
2021-10-22 20:43:56 s 1 -173346.86 2 +152942.30 2000.0 C57
2021-10-22 20:53:56 S 02 52 54.221 +08 49 12.90 V C57
2021-10-22 20:53:56 s 1 -173381.10 8 +152177.43 5090.0 C57
2021-10-22 21:23:56 S 02 52 55.027 +08 48 32.40 V C57
2021-10-22 21:23:56 s 1 -173472.80 1 +149873.12 5360.0 C57
2021-10-23 01:43:56 S 02 53 03.055 +08 42 39.35 V C57
2021-10-23 01:43:56 s 1 -173529.26 7 +129288.89 4520.0 C57
2021-10-23 01:53:56 S 02 53 03.410 +08 42 26.75 V C57
2021-10-23 01:53:56 s 1 -173503.31 2 +128475.10 5440.0 C57
2021-10-23 02:03:56 S 02 53 03.634 +08 42 13.68 V C57
2021-10-23 02:03:56 s 1 -173475.14 8 +127659.67 8600.0 C57
2021-10-23 02:13:56 S 02 53 04.032 +08 42 00.58 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)