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
2021-10-13 22:03:56 s 1 +173335.47 8 +116477.24 970.0 C57
2021-10-13 22:13:56 S 02 53 52.282 +12 33 08.78 V C57
2021-10-13 22:13:56 s 1 +173400.78 2 +117312.85 6180.0 C57
2021-10-14 01:13:56 S 02 53 50.904 +12 31 21.58 V C57
2021-10-14 01:13:56 s 1 +174176.17 0 +132073.29 3570.0 C57
2021-10-14 01:23:56 S 02 53 50.561 +12 31 14.70 V C57
2021-10-14 01:23:56 s 1 +174197.96 0 +132877.74 2370.0 C57
2021-10-14 02:13:56 S 02 53 49.781 +12 30 44.39 V C57
2021-10-14 02:13:56 s 1 +174274.98 7 +136875.46 9000.0 C57
2021-10-14 02:23:56 S 02 53 49.646 +12 30 36.90 V C57
2021-10-14 02:23:56 s 1 +174284.10 0 +137670.11 5160.0 C57
2021-10-14 02:33:56 S 02 53 49.666 +12 30 29.27 V C57
2021-10-14 02:33:56 s 1 +174291.14 7 +138463.12 4380.0 C57
2021-10-14 02:43:56 S 02 53 49.584 +12 30 23.94 V C57
2021-10-14 02:43:56 s 1 +174296.14 0 +139254.50 6700.0 C57
2021-10-14 02:53:56 S 02 53 49.246 +12 30 18.86 V C57
2021-10-14 02:53:56 s 1 +174299.09 1 +140044.25 2140.0 C57
2021-10-14 03:03:56 S 02 53 49.262 +12 30 16.06 V C57
2021-10-14 03:03:56 s 1 +174300.01 4 +140832.38 770.0 C57
2021-10-14 03:13:56 S 02 53 49.068 +12 30 07.16 V C57
2021-10-14 03:13:56 s 1 +174298.92 1 +141618.87 2630.0 C57
2021-10-14 03:33:56 S 02 53 48.854 +12 29 56.04 V C57
2021-10-14 03:33:56 s 1 +174290.73 7 +143186.98 6160.0 C57
2021-10-14 03:43:56 S 02 53 48.742 +12 29 48.26 V C57
2021-10-14 03:43:56 s 1 +174283.67 0 +143968.59 7930.0 C57
2021-10-14 03:53:56 S 02 53 48.622 +12 29 43.19 V C57
2021-10-14 03:53:56 s 1 +174274.63 6 +144748.59 3090.0 C57
2021-10-14 04:03:56 S 02 53 48.564 +12 29 34.01 V C57
2021-10-14 04:03:56 s 1 +174263.64 7 +145526.96 1670.0 C57
2021-10-14 04:13:56 S 02 53 48.502 +12 29 29.08 V C57
2021-10-14 04:13:56 s 1 +174250.71 5 +146303.71 3730.0 C57
2021-10-14 04:23:56 S 02 53 48.290 +12 29 19.90 V C57
2021-10-14 04:23:56 s 1 +174235.85 2 +147078.83 9290.0 C57
2021-10-14 04:53:56 S 02 53 47.911 +12 29 03.16 V C57
2021-10-14 04:53:56 s 1 +174179.79 1 +149394.50 7430.0 C57
2021-10-14 05:03:56 S 02 53 47.726 +12 28 57.68 V C57
2021-10-14 05:03:56 s 1 +174157.32 0 +150163.16 7420.0 C57
2021-10-14 05:53:56 S 02 53 47.234 +12 28 26.58 V C57
2021-10-14 05:53:56 s 1 +174017.08 0 +153982.26 3700.0 C57
2021-10-14 06:03:56 S 02 53 46.874 +12 28 22.19 V C57
2021-10-14 06:03:56 s 1 +173983.53 3 +154741.25 6480.0 C57
2021-10-14 06:33:56 S 02 53 46.723 +12 28 03.65 V C57
2021-10-14 06:33:56 s 1 +173872.09 1 +157008.58 8520.0 C57
2021-10-14 06:43:56 S 02 53 46.613 +12 27 55.08 V C57
2021-10-14 06:43:56 s 1 +173831.37 8 +157761.15 7230.0 C57
2021-10-14 06:53:56 S 02 53 46.486 +12 27 50.15 V C57
2021-10-14 06:53:56 s 1 +173788.90 0 +158512.12 0.0 C57
2021-10-14 07:03:56 S 02 53 46.346 +12 27 41.65 V C57
2021-10-14 07:03:56 s 1 +173744.66 8 +159261.49 6880.0 C57
2021-10-14 07:13:56 S 02 53 46.284 +12 27 36.32 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)