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
2021-10-27 03:43:56 S 02 54 49.044 +06 41 39.01 V C57
2021-10-27 03:43:56 s 1 +178619.94 5 +160979.17 2180.0 C57
2021-10-27 03:53:56 S 02 54 48.593 +06 41 21.62 V C57
2021-10-27 03:53:56 s 1 +178579.55 5 +161715.19 9390.0 C57
2021-10-27 04:03:56 S 02 54 48.103 +06 41 05.60 V C57
2021-10-27 04:03:56 s 1 +178537.48 8 +162449.69 980.0 C57
2021-10-27 04:13:56 S 02 54 47.686 +06 40 47.68 V C57
2021-10-27 04:13:56 s 1 +178493.75 6 +163182.67 6970.0 C57
2021-10-27 04:23:56 S 02 54 47.114 +06 40 30.97 V C57
2021-10-27 04:23:56 s 1 +178448.36 6 +163914.14 7400.0 C57
2021-10-27 04:33:56 S 02 54 46.591 +06 40 14.84 V C57
2021-10-27 04:33:56 s 1 +178401.32 8 +164644.08 2300.0 C57
2021-10-27 04:43:56 S 02 54 46.128 +06 39 58.03 V C57
2021-10-27 04:43:56 s 1 +178352.65 1 +165372.51 1690.0 C57
2021-10-27 04:53:56 S 02 54 45.742 +06 39 40.93 V C57
2021-10-27 04:53:56 s 1 +178302.34 5 +166099.43 5610.0 C57
2021-10-27 05:03:56 S 02 54 45.168 +06 39 23.90 V C57
2021-10-27 05:03:56 s 1 +178250.41 7 +166824.83 4100.0 C57
2021-10-27 05:13:56 S 02 54 44.724 +06 39 07.06 V C57
2021-10-27 05:13:56 s 1 +178196.87 9 +167548.72 7170.0 C57
2021-10-27 05:53:56 S 02 54 42.744 +06 37 59.16 V C57
2021-10-27 05:53:56 s 1 +177966.78 2 +170429.20 5980.0 C57
2021-10-27 06:03:56 S 02 54 42.281 +06 37 41.95 V C57
2021-10-27 06:03:56 s 1 +177905.31 6 +171145.55 2450.0 C57
2021-10-27 06:13:56 S 02 54 41.885 +06 37 25.75 V C57
2021-10-27 06:13:56 s 1 +177842.29 1 +171860.40 3700.0 C57
2021-10-27 07:03:56 S 02 54 39.408 +06 35 59.89 V C57
2021-10-27 07:03:56 s 1 +177504.06 8 +175412.13 2470.0 C57
2021-10-27 07:13:56 S 02 54 38.858 +06 35 42.04 V C57
2021-10-27 07:13:56 s 1 +177431.86 2 +176117.98 2930.0 C57
2021-10-27 07:23:56 S 02 54 38.472 +06 35 25.80 V C57
2021-10-27 07:23:56 s 1 +177358.15 5 +176822.34 8350.0 C57
2021-10-27 07:33:56 S 02 54 37.932 +06 35 07.73 V C57
2021-10-27 07:33:56 s 1 +177282.95 5 +177525.21 8780.0 C57
2021-10-27 07:43:56 S 02 54 37.411 +06 34 51.78 V C57
2021-10-27 07:43:56 s 1 +177206.26 9 +178226.59 4220.0 C57
2021-10-27 07:53:56 S 02 54 36.890 +06 34 34.18 V C57
2021-10-27 07:53:56 s 1 +177128.10 7 +178926.48 4710.0 C57
2021-10-27 08:03:56 S 02 54 36.468 +06 34 16.54 V C57
2021-10-27 08:03:56 s 1 +177048.47 4 +179624.87 280.0 C57
2021-10-27 08:13:56 S 02 54 35.988 +06 33 59.44 V C57
2021-10-27 08:13:56 s 1 +176967.38 1 +180321.79 950.0 C57
2021-10-27 08:23:56 S 02 54 35.503 +06 33 42.23 V C57
2021-10-27 08:23:56 s 1 +176884.83 3 +181017.21 6750.0 C57
2021-10-27 08:33:56 S 02 54 35.074 +06 33 25.31 V C57
2021-10-27 08:33:56 s 1 +176800.83 9 +181711.15 7700.0 C57
2021-10-27 08:43:56 S 02 54 34.505 +06 33 07.45 V C57
2021-10-27 08:43:56 s 1 +176715.40 7 +182403.61 3840.0 C57
2021-10-27 08:53:56 S 02 54 34.087 +06 32 49.60 V C57
2021-10-27 08:53:56 s 1 +176628.54 5 +183094.59 5180.0 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)