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
2021-10-19 21:23:56 s 1 -69052.731 0 +352082.06 4810.0 C57
2021-10-19 21:33:56 S 02 52 16.675 +10 21 07.20 V C57
2021-10-19 21:33:56 s 1 -69402.720 0 +351876.84 1430.0 C57
2021-10-19 21:43:56 S 02 52 16.610 +10 20 54.42 V C57
2021-10-19 21:43:56 s 1 -69752.496 0 +351670.53 7200.0 C57
2021-10-19 21:53:56 S 02 52 16.651 +10 20 43.19 V C57
2021-10-19 21:53:56 s 1 -70102.056 0 +351463.12 2130.0 C57
2021-10-19 22:03:56 S 02 52 16.649 +10 20 30.95 V C57
2021-10-19 22:03:56 s 1 -70451.399 0 +351254.62 6210.0 C57
2021-10-19 22:13:56 S 02 52 16.625 +10 20 19.54 V C57
2021-10-19 22:13:56 s 1 -70800.524 0 +351045.02 9430.0 C57
2021-10-19 22:23:56 S 02 52 16.500 +10 20 06.79 V C57
2021-10-19 22:23:56 s 1 -71149.430 0 +350834.32 1800.0 C57
2021-10-19 22:33:56 S 02 52 16.495 +10 19 53.69 V C57
2021-10-19 22:33:56 s 1 -71498.115 0 +350622.53 3310.0 C57
2021-10-19 22:43:56 S 02 52 16.442 +10 19 42.49 V C57
2021-10-19 22:43:56 s 1 -71846.578 0 +350409.63 3940.0 C57
2021-10-19 22:53:56 S 02 52 16.406 +10 19 31.19 V C57
2021-10-19 22:53:56 s 1 -72194.818 0 +350195.64 3710.0 C57
2021-10-19 23:03:56 S 02 52 16.334 +10 19 20.32 V C57
2021-10-19 23:03:56 s 1 -72542.833 0 +349980.55 2600.0 C57
2021-10-19 23:13:56 S 02 52 16.411 +10 19 06.53 V C57
2021-10-19 23:13:56 s 1 -72890.622 0 +349764.36 610.0 C57
2021-10-19 23:23:56 S 02 52 16.318 +10 18 54.58 V C57
2021-10-19 23:23:56 s 1 -73238.184 0 +349547.06 7730.0 C57
2021-10-19 23:33:56 S 02 52 16.291 +10 18 42.44 V C57
2021-10-19 23:33:56 s 1 -73585.517 0 +349328.67 3960.0 C57
2021-10-19 23:43:56 S 02 52 16.258 +10 18 31.18 V C57
2021-10-19 23:43:56 s 1 -73932.620 0 +349109.17 9290.0 C57
2021-10-19 23:53:56 S 02 52 16.140 +10 18 20.02 V C57
2021-10-19 23:53:56 s 1 -74279.492 0 +348888.57 3720.0 C57
2021-10-20 00:03:56 S 02 52 16.118 +10 18 08.39 V C57
2021-10-20 00:03:56 s 1 -74626.131 0 +348666.87 7250.0 C57
2021-10-20 00:13:56 S 02 52 16.186 +10 17 55.82 V C57
2021-10-20 00:13:56 s 1 -74972.536 0 +348444.07 9870.0 C57
2021-10-20 00:23:56 S 02 52 16.169 +10 17 43.33 V C57
2021-10-20 00:23:56 s 1 -75318.705 0 +348220.16 1570.0 C57
2021-10-20 00:33:56 S 02 52 16.217 +10 17 31.45 V C57
2021-10-20 00:33:56 s 1 -75664.638 0 +347995.15 2360.0 C57
2021-10-20 00:43:56 S 02 52 16.075 +10 17 21.52 V C57
2021-10-20 00:43:56 s 1 -76010.333 0 +347769.03 2210.0 C57
2021-10-20 00:53:56 S 02 52 15.984 +10 17 08.59 V C57
2021-10-20 00:53:56 s 1 -76355.788 0 +347541.81 1140.0 C57
2021-10-20 01:03:56 S 02 52 16.097 +10 16 55.99 V C57
2021-10-20 01:03:56 s 1 -76701.002 0 +347313.48 9140.0 C57
2021-10-20 01:13:56 S 02 52 16.147 +10 16 44.69 V C57
2021-10-20 01:13:56 s 1 -77045.974 0 +347084.05 6190.0 C57
2021-10-20 01:23:56 S 02 52 15.946 +10 16 31.73 V C57
2021-10-20 01:23:56 s 1 -77390.702 0 +346853.50 2310.0 C57
2021-10-20 01:33:56 S 02 52 15.938 +10 16 18.95 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)