IAA RAS IAA Minor Planet Database

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
2021-10-29 13:23:56 S 02 51 52.606 +04 48 52.02 – V C57
2021-10-29 13:23:56 s 1 +103928.99 3 +334480.97 6540.0 – C57
2021-10-29 13:33:56 S 02 51 52.106 +04 48 29.30 – V C57
2021-10-29 13:33:56 s 1 +103608.46 0 +334770.90 5720.0 – C57
2021-10-29 13:43:56 S 02 51 51.634 +04 48 08.21 – V C57
2021-10-29 13:43:56 s 1 +103287.59 3 +335059.73 3840.0 – C57
2021-10-29 13:53:56 S 02 51 51.161 +04 47 45.02 – V C57
2021-10-29 13:53:56 s 1 +102966.39 3 +335347.44 890.0 – C57
2021-10-29 14:03:56 S 02 51 50.621 +04 47 22.60 – V C57
2021-10-29 14:03:56 s 1 +102644.86 2 +335634.05 6890.0 – C57
2021-10-29 14:13:56 S 02 51 50.093 +04 46 59.88 – V C57
2021-10-29 14:13:56 s 1 +102323.00 1 +335919.54 1850.0 – C57
2021-10-29 14:23:56 S 02 51 49.615 +04 46 38.50 – V C57
2021-10-29 14:23:56 s 1 +102000.81 2 +336203.93 5750.0 – C57
2021-10-29 14:33:56 S 02 51 49.025 +04 46 16.18 – V C57
2021-10-29 14:33:56 s 1 +101678.29 6 +336487.21 8620.0 – C57
2021-10-29 14:43:56 S 02 51 48.542 +04 45 53.60 – V C57
2021-10-29 14:43:56 s 1 +101355.45 5 +336769.38 460.0 – C57
2021-10-29 14:53:56 S 02 51 47.993 +04 45 31.93 – V C57
2021-10-29 14:53:56 s 1 +101032.29 1 +337050.45 1260.0 – C57
2021-10-29 15:03:56 S 02 51 47.453 +04 45 09.94 – V C57
2021-10-29 15:03:56 s 1 +100708.80 5 +337330.41 1040.0 – C57
2021-10-29 15:13:56 S 02 51 46.956 +04 44 47.87 – V C57
2021-10-29 15:13:56 s 1 +100384.99 8 +337609.26 9810.0 – C57
2021-10-29 15:23:56 S 02 51 46.466 +04 44 24.97 – V C57
2021-10-29 15:23:56 s 1 +100060.87 2 +337887.01 7560.0 – C57
2021-10-29 15:33:56 S 02 51 45.938 +04 44 02.83 – V C57
2021-10-29 15:33:56 s 1 +99736.429 0 +338163.66 4300.0 – C57
2021-10-29 15:43:56 S 02 51 45.415 +04 43 40.80 – V C57
2021-10-29 15:43:56 s 1 +99411.671 0 +338439.20 40.0 – C57
2021-10-29 15:53:56 S 02 51 44.902 +04 43 18.34 – V C57
2021-10-29 15:53:56 s 1 +99086.597 0 +338713.64 4780.0 – C57
2021-10-29 16:03:56 S 02 51 44.381 +04 42 55.01 – V C57
2021-10-29 16:03:56 s 1 +98761.211 0 +338986.98 8530.0 – C57
2021-10-29 16:13:56 S 02 51 43.944 +04 42 33.37 – V C57
2021-10-29 16:13:56 s 1 +98435.514 0 +339259.22 1300.0 – C57
2021-10-29 16:23:56 S 02 51 43.361 +04 42 10.26 – V C57
2021-10-29 16:23:56 s 1 +98109.507 0 +339530.35 3080.0 – C57
2021-10-30 06:08:47 C 02 53 52.65 +04 01 53.6 – U I41
2021-10-30 06:10:09 C 02 53 52.61 +04 01 50.7 – U I41
2021-10-30 07:35:53 C 02 53 49.78 +03 58 43.8 – U I41
2021-10-30 08:07:09 C 02 53 48.71 +03 57 35.2 – U I41
2021-10-30 09:27:19 C 02 53 48.991 +03 54 53.82 – U F51
2021-10-30 09:57:17 C 02 53 47.916 +03 53 47.94 – U F51
2021-10-30 10:15:33 C 02 53 47.255 +03 53 07.52 – U F51
2021-10-30 15:16:30 C 02 53 43.462 +03 42 51.44 – V P07
2021-10-30 17:01:11 C 02 53 39.574 +03 38 55.90 – V P07
2021-10-30 17:53:08 C 02 53 37.642 +03 36 58.18 – V P07
2021-10-30 17:53:34 C 02 53 37.630 +03 36 57.10 – V P07
2021-10-30 18:30:26 C 02 53 36.295 +03 35 33.18 – V P07
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)