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
2021-10-17 12:53:56 s 1 +54399.000 0 +360371.66 2870.0 C57
2021-10-17 13:13:56 S 02 52 44.383 +11 22 36.48 V C57
2021-10-17 13:13:56 s 1 +53683.474 0 +360678.29 8110.0 C57
2021-10-17 13:53:56 S 02 52 43.846 +11 21 58.10 V C57
2021-10-17 13:53:56 s 1 +52250.517 0 +361278.69 2910.0 C57
2021-10-17 14:03:56 S 02 52 43.745 +11 21 47.66 V C57
2021-10-17 14:03:56 s 1 +51891.887 0 +361426.12 7940.0 C57
2021-10-17 14:13:56 S 02 52 43.718 +11 21 36.83 V C57
2021-10-17 14:13:56 s 1 +51533.104 0 +361572.48 2520.0 C57
2021-10-17 14:23:56 S 02 52 43.598 +11 21 26.60 V C57
2021-10-17 14:23:56 s 1 +51174.168 0 +361717.78 6650.0 C57
2021-10-17 14:33:56 S 02 52 43.301 +11 21 16.78 V C57
2021-10-17 14:33:56 s 1 +50815.081 0 +361862.00 330.0 C57
2021-10-17 14:53:56 S 02 52 43.193 +11 20 57.23 V C57
2021-10-17 14:53:56 s 1 +50096.458 0 +362147.25 6370.0 C57
2021-10-17 15:03:56 S 02 52 43.210 +11 20 46.93 V C57
2021-10-17 15:03:56 s 1 +49736.924 0 +362288.27 8730.0 C57
2021-10-17 15:53:56 S 02 52 42.454 +11 19 56.42 V C57
2021-10-17 15:53:56 s 1 +47937.075 0 +362977.41 4130.0 C57
2021-10-17 16:03:56 S 02 52 42.444 +11 19 47.50 V C57
2021-10-17 16:03:56 s 1 +47576.678 0 +363112.04 3960.0 C57
2021-10-17 16:13:56 S 02 52 42.286 +11 19 36.19 V C57
2021-10-17 16:13:56 s 1 +47216.141 0 +363245.60 3380.0 C57
2021-10-17 16:23:56 S 02 52 42.216 +11 19 28.45 V C57
2021-10-17 16:23:56 s 1 +46855.466 0 +363378.10 2400.0 C57
2021-10-17 16:33:56 S 02 52 42.031 +11 19 16.93 V C57
2021-10-17 16:33:56 s 1 +46494.652 0 +363509.54 1010.0 C57
2021-10-17 17:03:56 S 02 52 41.753 +11 18 43.78 V C57
2021-10-17 17:03:56 s 1 +45411.399 0 +363897.47 4510.0 C57
2021-10-17 17:23:56 S 02 52 41.299 +11 18 27.32 V C57
2021-10-17 17:23:56 s 1 +44688.563 0 +364150.78 8240.0 C57
2021-10-17 17:43:56 S 02 52 41.275 +11 18 06.70 V C57
2021-10-17 17:43:56 s 1 +43965.204 0 +364399.84 470.0 C57
2021-10-17 17:53:56 S 02 52 41.148 +11 17 55.61 V C57
2021-10-17 17:53:56 s 1 +43603.331 0 +364522.77 6030.0 C57
2021-10-17 18:03:56 S 02 52 40.865 +11 17 48.23 V C57
2021-10-17 18:03:56 s 1 +43241.331 0 +364644.65 1230.0 C57
2021-10-17 18:23:56 S 02 52 40.834 +11 17 26.38 V C57
2021-10-17 18:23:56 s 1 +42516.953 0 +364885.21 550.0 C57
2021-10-17 18:43:56 S 02 52 40.572 +11 17 06.47 V C57
2021-10-17 18:43:56 s 1 +41792.080 0 +365121.54 8450.0 C57
2021-10-17 19:03:56 S 02 52 40.272 +11 16 45.88 V C57
2021-10-17 19:03:56 s 1 +41066.719 0 +365353.62 4980.0 C57
2021-10-17 19:13:56 S 02 52 40.258 +11 16 35.51 V C57
2021-10-17 19:13:56 s 1 +40703.859 0 +365468.07 7740.0 C57
2021-10-17 19:23:56 S 02 52 40.171 +11 16 23.99 V C57
2021-10-17 19:23:56 s 1 +40340.881 0 +365581.47 160.0 C57
2021-10-17 19:33:56 S 02 52 40.118 +11 16 13.04 V C57
2021-10-17 19:33:56 s 1 +39977.785 0 +365693.80 2260.0 C57
2021-10-17 19:43:56 S 02 52 39.898 +11 16 05.77 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)