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
2021-10-18 00:23:56 s 1 +29401.939 0 +368491.81 7180.0 C57
2021-10-18 00:33:56 S 02 52 36.732 +11 11 07.22 V C57
2021-10-18 00:33:56 s 1 +29035.835 0 +368572.48 1190.0 C57
2021-10-18 00:43:56 S 02 52 36.646 +11 10 56.82 V C57
2021-10-18 00:43:56 s 1 +28669.648 0 +368652.09 4980.0 C57
2021-10-18 01:13:56 S 02 52 36.343 +11 10 25.75 V C57
2021-10-18 01:13:56 s 1 +27570.596 0 +368884.61 5150.0 C57
2021-10-18 01:23:56 S 02 52 36.118 +11 10 14.92 V C57
2021-10-18 01:23:56 s 1 +27204.086 0 +368960.02 8150.0 C57
2021-10-18 01:33:56 S 02 52 36.134 +11 10 04.30 V C57
2021-10-18 01:33:56 s 1 +26837.497 0 +369034.37 950.0 C57
2021-10-18 01:43:56 S 02 52 35.998 +11 09 55.12 V C57
2021-10-18 01:43:56 s 1 +26470.832 0 +369107.67 3570.0 C57
2021-10-18 01:53:56 S 02 52 35.861 +11 09 45.29 V C57
2021-10-18 01:53:56 s 1 +26104.090 0 +369179.92 5990.0 C57
2021-10-18 02:03:56 S 02 52 35.736 +11 09 34.85 V C57
2021-10-18 02:03:56 s 1 +25737.274 0 +369251.11 8240.0 C57
2021-10-18 02:13:56 S 02 52 35.851 +11 09 23.04 V C57
2021-10-18 02:13:56 s 1 +25370.384 0 +369321.26 320.0 C57
2021-10-18 02:23:56 S 02 52 35.645 +11 09 12.89 V C57
2021-10-18 02:23:56 s 1 +25003.421 0 +369390.36 2220.0 C57
2021-10-18 02:33:56 S 02 52 35.515 +11 09 04.43 V C57
2021-10-18 02:33:56 s 1 +24636.386 0 +369458.40 3950.0 C57
2021-10-18 02:43:56 S 02 52 35.414 +11 08 54.20 V C57
2021-10-18 02:43:56 s 1 +24269.281 0 +369525.39 5510.0 C57
2021-10-18 02:53:56 S 02 52 35.280 +11 08 42.40 V C57
2021-10-18 02:53:56 s 1 +23902.106 0 +369591.34 6910.0 C57
2021-10-18 03:13:56 S 02 52 35.167 +11 08 22.67 V C57
2021-10-18 03:13:56 s 1 +23167.551 0 +369720.07 9250.0 C57
2021-10-18 03:23:56 S 02 52 35.100 +11 08 12.48 V C57
2021-10-18 03:23:56 s 1 +22800.174 0 +369782.86 180.0 C57
2021-10-18 03:33:56 S 02 52 34.963 +11 08 01.28 V C57
2021-10-18 03:33:56 s 1 +22432.731 0 +369844.61 980.0 C57
2021-10-18 03:43:56 S 02 52 35.059 +11 07 51.74 V C57
2021-10-18 03:43:56 s 1 +22065.224 0 +369905.30 1620.0 C57
2021-10-18 03:53:56 S 02 52 34.702 +11 07 39.07 V C57
2021-10-18 03:53:56 s 1 +21697.654 0 +369964.94 2130.0 C57
2021-10-18 04:03:56 S 02 52 34.622 +11 07 30.50 V C57
2021-10-18 04:03:56 s 1 +21330.022 0 +370023.53 2510.0 C57
2021-10-18 04:13:56 S 02 52 34.538 +11 07 19.38 V C57
2021-10-18 04:13:56 s 1 +20962.328 0 +370081.08 2750.0 C57
2021-10-18 04:23:56 S 02 52 34.469 +11 07 07.43 V C57
2021-10-18 04:23:56 s 1 +20594.574 0 +370137.57 2860.0 C57
2021-10-18 04:33:56 S 02 52 34.346 +11 06 57.60 V C57
2021-10-18 04:33:56 s 1 +20226.762 0 +370193.02 2850.0 C57
2021-10-18 04:43:56 S 02 52 34.164 +11 06 47.56 V C57
2021-10-18 04:43:56 s 1 +19858.891 0 +370247.41 2710.0 C57
2021-10-18 04:53:56 S 02 52 34.085 +11 06 37.04 V C57
2021-10-18 04:53:56 s 1 +19490.964 0 +370300.76 2460.0 C57
2021-10-18 05:03:56 S 02 52 34.078 +11 06 25.63 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)