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
2021-10-28 09:13:56 S 02 53 20.191 +05 47 47.11 V C57
2021-10-28 09:13:56 s 1 +151786.85 8 +268885.14 8210.0 C57
2021-10-28 09:23:56 S 02 53 19.637 +05 47 27.13 V C57
2021-10-28 09:23:56 s 1 +151550.84 6 +269374.67 2940.0 C57
2021-10-28 09:33:56 S 02 53 19.176 +05 47 07.73 V C57
2021-10-28 09:33:56 s 1 +151314.12 7 +269862.94 5340.0 C57
2021-10-28 09:43:56 S 02 53 18.650 +05 46 47.24 V C57
2021-10-28 09:43:56 s 1 +151076.70 6 +270349.94 5420.0 C57
2021-10-28 09:53:56 S 02 53 18.108 +05 46 28.49 V C57
2021-10-28 09:53:56 s 1 +150838.58 5 +270835.68 3190.0 C57
2021-10-28 10:03:56 S 02 53 17.633 +05 46 08.65 V C57
2021-10-28 10:03:56 s 1 +150599.76 7 +271320.16 8660.0 C57
2021-10-28 10:13:56 S 02 53 17.160 +05 45 48.28 V C57
2021-10-28 10:13:56 s 1 +150360.25 6 +271803.37 1840.0 C57
2021-10-28 10:23:56 S 02 53 16.591 +05 45 28.51 V C57
2021-10-28 10:23:56 s 1 +150120.05 3 +272285.32 2750.0 C57
2021-10-28 10:33:56 S 02 53 16.068 +05 45 08.96 V C57
2021-10-28 10:33:56 s 1 +149879.16 3 +272766.01 1380.0 C57
2021-10-28 10:43:56 S 02 53 15.552 +05 44 49.74 V C57
2021-10-28 10:43:56 s 1 +149637.58 8 +273245.45 7760.0 C57
2021-10-28 10:53:56 S 02 53 15.007 +05 44 30.16 V C57
2021-10-28 10:53:56 s 1 +149395.33 1 +273723.62 1890.0 C57
2021-10-28 11:03:56 S 02 53 14.491 +05 44 09.85 V C57
2021-10-28 11:03:56 s 1 +149152.39 6 +274200.54 3780.0 C57
2021-10-28 11:13:56 S 02 53 13.927 +05 43 49.48 V C57
2021-10-28 11:13:56 s 1 +148908.78 5 +274676.21 3440.0 C57
2021-10-28 11:23:56 S 02 53 13.440 +05 43 29.86 V C57
2021-10-28 11:23:56 s 1 +148664.50 1 +275150.62 890.0 C57
2021-10-28 11:30:14 C 02 54 24.41 +05 28 57.2 V T05
2021-10-28 11:33:56 S 02 53 12.972 +05 43 10.81 V C57
2021-10-28 11:33:56 s 1 +148419.54 7 +275623.78 6130.0 C57
2021-10-28 11:34:52 C 02 54 24.27 +05 28 48.4 V T05
2021-10-28 11:43:56 S 02 53 12.494 +05 42 50.22 V C57
2021-10-28 11:43:56 s 1 +148173.92 7 +276095.68 9170.0 C57
2021-10-28 11:53:56 S 02 53 11.990 +05 42 30.71 V C57
2021-10-28 11:53:56 s 1 +147927.64 2 +276566.34 30.0 C57
2021-10-28 12:03:56 S 02 53 11.446 +05 42 09.97 V C57
2021-10-28 12:03:56 s 1 +147680.69 7 +277035.75 8700.0 C57
2021-10-28 12:04:57 C 02 54 23.36 +05 27 51.0 V T05
2021-10-28 12:13:56 S 02 53 10.898 +05 41 50.39 V C57
2021-10-28 12:13:56 s 1 +147433.09 3 +277503.90 5210.0 C57
2021-10-28 12:18:58 C 02 54 22.95 +05 27 24.3 V T05
2021-10-28 12:23:56 S 02 53 10.402 +05 41 30.44 V C57
2021-10-28 12:23:56 s 1 +147184.83 4 +277970.82 9560.0 C57
2021-10-28 12:33:56 S 02 53 09.871 +05 41 10.72 V C57
2021-10-28 12:33:56 s 1 +146935.92 2 +278436.48 1760.0 C57
2021-10-28 12:43:56 S 02 53 09.358 +05 40 50.41 V C57
2021-10-28 12:43:56 s 1 +146686.36 1 +278900.91 1830.0 C57
2021-10-28 12:53:56 S 02 53 08.803 +05 40 30.79 V C57
2021-10-28 12:53:56 s 1 +146436.20 3 +279364.12 9770.0 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)