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 09:03:56 S 02 54 33.497 +06 32 32.24 V C57
2021-10-27 09:03:56 s 1 +176540.25 9 +183784.09 1750.0 C57
2021-10-27 09:13:56 S 02 54 33.046 +06 32 15.61 V C57
2021-10-27 09:13:56 s 1 +176450.55 7 +184472.11 3590.0 C57
2021-10-27 09:23:56 S 02 54 32.530 +06 31 57.97 V C57
2021-10-27 09:23:56 s 1 +176359.44 7 +185158.66 700.0 C57
2021-10-27 09:33:56 S 02 54 32.040 +06 31 40.62 V C57
2021-10-27 09:33:56 s 1 +176266.93 6 +185843.73 3130.0 C57
2021-10-27 09:43:56 S 02 54 31.536 +06 31 23.45 V C57
2021-10-27 09:43:56 s 1 +176173.03 2 +186527.33 890.0 C57
2021-10-27 09:53:56 S 02 54 31.044 +06 31 04.19 V C57
2021-10-27 09:53:56 s 1 +176077.74 1 +187209.45 4010.0 C57
2021-10-27 10:03:56 S 02 54 30.506 +06 30 49.75 V C57
2021-10-27 10:03:56 s 1 +175981.07 2 +187890.10 2510.0 C57
2021-10-27 10:13:56 S 02 54 29.952 +06 30 34.24 V C57
2021-10-27 10:13:56 s 1 +175883.03 1 +188569.29 6420.0 C57
2021-10-27 10:23:56 S 02 54 29.578 +06 30 12.42 V C57
2021-10-27 10:23:56 s 1 +175783.62 5 +189247.00 5770.0 C57
2021-10-27 10:33:56 S 02 54 29.191 +06 29 55.50 V C57
2021-10-27 10:33:56 s 1 +175682.86 2 +189923.25 570.0 C57
2021-10-27 10:43:56 S 02 54 28.603 +06 29 38.76 V C57
2021-10-27 10:43:56 s 1 +175580.74 8 +190598.04 850.0 C57
2021-10-27 10:53:56 S 02 54 28.150 +06 29 21.19 V C57
2021-10-27 10:53:56 s 1 +175477.29 1 +191271.36 6630.0 C57
2021-10-27 11:01:35 C 02 54 40.14 +06 13 40.9 V T05
2021-10-27 11:03:56 S 02 54 27.653 +06 29 03.77 V C57
2021-10-27 11:03:56 s 1 +175372.49 7 +191943.23 7940.0 C57
2021-10-27 11:06:51 C 02 54 39.99 +06 13 31.7 V T05
2021-10-27 11:13:56 S 02 54 27.175 +06 28 45.77 V C57
2021-10-27 11:13:56 s 1 +175266.37 3 +192613.63 4810.0 C57
2021-10-27 11:23:56 S 02 54 26.686 +06 28 28.16 V C57
2021-10-27 11:23:56 s 1 +175158.92 7 +193282.57 7240.0 C57
2021-10-27 11:33:56 S 02 54 26.136 +06 28 11.14 V C57
2021-10-27 11:33:56 s 1 +175050.16 5 +193950.06 5280.0 C57
2021-10-27 11:43:56 S 02 54 25.692 +06 27 53.57 V C57
2021-10-27 11:43:56 s 1 +174940.09 3 +194616.09 8940.0 C57
2021-10-27 11:53:56 S 02 54 25.210 +06 27 35.35 V C57
2021-10-27 11:53:56 s 1 +174828.72 0 +195280.67 8240.0 C57
2021-10-27 11:57:12 C 02 54 38.62 +06 12 02.8 V T05
2021-10-27 12:03:56 S 02 54 24.682 +06 27 17.75 V C57
2021-10-27 12:03:56 s 1 +174716.05 0 +195943.79 3200.0 C57
2021-10-27 12:08:24 C 02 54 38.33 +06 11 42.9 V T05
2021-10-27 12:13:56 S 02 54 24.204 +06 27 00.72 V C57
2021-10-27 12:13:56 s 1 +174602.09 1 +196605.46 3860.0 C57
2021-10-27 12:23:56 S 02 54 23.638 +06 26 43.51 V C57
2021-10-27 12:23:56 s 1 +174486.84 9 +197265.69 230.0 C57
2021-10-27 12:33:56 S 02 54 23.069 +06 26 25.30 V C57
2021-10-27 12:33:56 s 1 +174370.33 2 +197924.47 2330.0 C57
2021-10-27 12:43:56 S 02 54 22.702 +06 26 07.30 V C57
2021-10-27 12:43:56 s 1 +174252.54 4 +198581.80 180.0 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)