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 16:33:56 s 1 +169704.87 8 +87986.276 420.0 C57
2021-10-13 16:43:56 S 02 53 55.745 +12 36 14.15 V C57
2021-10-13 16:43:56 s 1 +169860.29 6 +88875.501 9140.0 C57
2021-10-13 16:53:56 S 02 53 55.860 +12 36 10.66 V C57
2021-10-13 16:53:56 s 1 +170012.66 7 +89763.132 7600.0 C57
2021-10-13 17:03:56 S 02 53 55.824 +12 36 02.02 V C57
2021-10-13 17:03:56 s 1 +170162.01 2 +90649.166 5860.0 C57
2021-10-13 17:13:56 S 02 53 55.488 +12 35 53.41 V C57
2021-10-13 17:13:56 s 1 +170308.35 3 +91533.600 3990.0 C57
2021-10-13 17:23:56 S 02 53 55.366 +12 35 49.34 V C57
2021-10-13 17:23:56 s 1 +170451.71 2 +92416.432 2070.0 C57
2021-10-13 17:43:56 S 02 53 55.082 +12 35 44.09 V C57
2021-10-13 17:43:56 s 1 +170729.56 7 +94177.278 8370.0 C57
2021-10-13 18:13:56 S 02 53 54.996 +12 35 23.96 V C57
2021-10-13 18:13:56 s 1 +171124.50 1 +96806.468 4210.0 C57
2021-10-13 18:23:56 S 02 53 54.638 +12 35 19.43 V C57
2021-10-13 18:23:56 s 1 +171250.40 1 +97679.634 3470.0 C57
2021-10-13 18:33:56 S 02 53 54.751 +12 35 15.83 V C57
2021-10-13 18:33:56 s 1 +171373.46 3 +98551.182 3160.0 C57
2021-10-13 18:43:56 S 02 53 54.742 +12 35 08.09 V C57
2021-10-13 18:43:56 s 1 +171493.70 6 +99421.109 3360.0 C57
2021-10-13 18:53:56 S 02 53 54.550 +12 35 02.22 V C57
2021-10-13 18:53:56 s 1 +171611.15 0 +100289.41 4130.0 C57
2021-10-13 19:03:56 S 02 53 54.540 +12 34 57.94 V C57
2021-10-13 19:03:56 s 1 +171725.81 3 +101156.09 5530.0 C57
2021-10-13 19:13:56 S 02 53 54.228 +12 34 53.90 V C57
2021-10-13 19:13:56 s 1 +171837.71 6 +102021.15 7640.0 C57
2021-10-13 19:33:56 S 02 53 54.209 +12 34 38.71 V C57
2021-10-13 19:33:56 s 1 +172053.31 6 +103746.38 4210.0 C57
2021-10-13 19:53:56 S 02 53 54.012 +12 34 28.85 V C57
2021-10-13 19:53:56 s 1 +172258.09 9 +105465.09 4350.0 C57
2021-10-13 20:03:56 S 02 53 53.892 +12 34 22.87 V C57
2021-10-13 20:03:56 s 1 +172356.48 1 +106321.99 910.0 C57
2021-10-13 20:13:56 S 02 53 53.830 +12 34 15.56 V C57
2021-10-13 20:13:56 s 1 +172452.21 4 +107177.27 8560.0 C57
2021-10-13 20:23:56 S 02 53 53.472 +12 34 12.14 V C57
2021-10-13 20:23:56 s 1 +172545.31 6 +108030.91 7350.0 C57
2021-10-13 20:33:56 S 02 53 53.729 +12 34 04.66 V C57
2021-10-13 20:33:56 s 1 +172635.80 4 +108882.91 7330.0 C57
2021-10-13 20:53:56 S 02 53 53.342 +12 33 53.93 V C57
2021-10-13 20:53:56 s 1 +172809.01 3 +110582.01 1150.0 C57
2021-10-13 21:03:56 S 02 53 53.244 +12 33 48.92 V C57
2021-10-13 21:03:56 s 1 +172891.76 8 +111429.10 5100.0 C57
2021-10-13 21:23:56 S 02 53 52.994 +12 33 35.89 V C57
2021-10-13 21:23:56 s 1 +173049.66 4 +113118.38 7360.0 C57
2021-10-13 21:33:56 S 02 53 52.901 +12 33 32.36 V C57
2021-10-13 21:33:56 s 1 +173124.84 0 +113960.55 5800.0 C57
2021-10-13 21:43:56 S 02 53 52.745 +12 33 23.87 V C57
2021-10-13 21:43:56 s 1 +173197.52 3 +114801.09 5840.0 C57
2021-10-13 22:03:56 S 02 53 52.546 +12 33 15.26 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)