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 11:33:56 S 02 53 58.366 +12 38 55.82 V C57
2021-10-13 11:33:56 s 1 +163508.27 3 +60589.047 5290.0 C57
2021-10-13 11:43:56 S 02 53 58.015 +12 38 48.41 V C57
2021-10-13 11:43:56 s 1 +163766.35 7 +61523.964 330.0 C57
2021-10-13 11:53:56 S 02 53 58.003 +12 38 43.01 V C57
2021-10-13 11:53:56 s 1 +164020.63 2 +62457.449 2510.0 C57
2021-10-13 12:03:56 S 02 53 57.946 +12 38 40.96 V C57
2021-10-13 12:03:56 s 1 +164271.12 8 +63389.496 1930.0 C57
2021-10-13 12:26:16 C 02 53 28.375 +12 28 40.43 U F52
2021-10-13 12:43:48 C 02 53 28.436 +12 28 28.46 U F52
2021-10-13 12:43:56 S 02 53 57.775 +12 38 17.99 V C57
2021-10-13 12:43:56 s 1 +165235.88 4 +67103.130 3970.0 C57
2021-10-13 12:53:56 S 02 53 57.538 +12 38 14.50 V C57
2021-10-13 12:53:56 s 1 +165467.90 8 +68027.864 1060.0 C57
2021-10-13 13:00:20 C 02 53 28.497 +12 28 17.14 U F52
2021-10-13 13:13:56 S 02 53 57.598 +12 38 04.02 V C57
2021-10-13 13:13:56 s 1 +165921.15 1 +69872.872 8760.0 C57
2021-10-13 13:17:52 C 02 53 28.561 +12 28 05.10 U F52
2021-10-13 13:18:48 C 02 53 28.565 +12 28 04.44 U F52
2021-10-13 13:23:56 S 02 53 57.542 +12 37 58.55 V C57
2021-10-13 13:23:56 s 1 +166142.42 4 +70793.133 9560.0 C57
2021-10-13 13:33:56 S 02 53 57.518 +12 37 55.38 V C57
2021-10-13 13:33:56 s 1 +166360.16 7 +71711.890 8460.0 C57
2021-10-13 13:43:56 S 02 53 57.206 +12 37 48.43 V C57
2021-10-13 13:43:56 s 1 +166574.40 7 +72629.137 5540.0 C57
2021-10-13 14:03:56 S 02 53 57.120 +12 37 38.03 V C57
2021-10-13 14:03:56 s 1 +166992.48 2 +74459.078 4590.0 C57
2021-10-13 14:13:56 S 02 53 57.096 +12 37 35.51 V C57
2021-10-13 14:13:56 s 1 +167196.36 8 +75371.761 6740.0 C57
2021-10-13 14:23:56 S 02 53 56.743 +12 37 29.35 V C57
2021-10-13 14:23:56 s 1 +167396.85 3 +76282.911 7420.0 C57
2021-10-13 14:33:56 S 02 53 56.863 +12 37 24.92 V C57
2021-10-13 14:33:56 s 1 +167593.96 4 +77192.524 6720.0 C57
2021-10-13 14:43:56 S 02 53 56.990 +12 37 15.64 V C57
2021-10-13 14:43:56 s 1 +167787.72 5 +78100.594 4720.0 C57
2021-10-13 14:53:56 S 02 53 56.772 +12 37 13.15 V C57
2021-10-13 14:53:56 s 1 +167978.16 0 +79007.117 1510.0 C57
2021-10-13 15:03:56 S 02 53 56.746 +12 37 04.26 V C57
2021-10-13 15:03:56 s 1 +168165.29 5 +79912.087 7160.0 C57
2021-10-13 15:13:56 S 02 53 56.635 +12 37 00.70 V C57
2021-10-13 15:13:56 s 1 +168349.15 2 +80815.500 1770.0 C57
2021-10-13 15:23:56 S 02 53 56.489 +12 36 56.56 V C57
2021-10-13 15:23:56 s 1 +168529.75 7 +81717.353 5400.0 C57
2021-10-13 15:33:56 S 02 53 56.587 +12 36 48.31 V C57
2021-10-13 15:33:56 s 1 +168707.13 3 +82617.640 8150.0 C57
2021-10-13 16:03:56 S 02 53 56.434 +12 36 33.98 V C57
2021-10-13 16:03:56 s 1 +169220.12 0 +85309.071 1860.0 C57
2021-10-13 16:23:56 S 02 53 55.992 +12 36 23.54 V C57
2021-10-13 16:23:56 s 1 +169546.39 1 +87095.461 1340.0 C57
2021-10-13 16:33:56 S 02 53 55.783 +12 36 19.44 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)