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
2021-10-25 00:18:00 C 02 55 03.15 +07 47 43.2 – Y 557
2021-10-25 01:15:56 C 02 55 02.27 +07 46 17.5 – Y 557
2021-10-25 02:01:40 C 02 55 01.61 +07 45 09.4 – Y 557
2021-10-25 03:21:36 C 02 55 00.62 +07 43 09.7 – Y 557
2021-10-25 08:38:49 C 02 55 00.77 +07 35 32.7 – V 703
2021-10-25 08:46:33 C 02 55 00.62 +07 35 20.9 – V 703
2021-10-25 08:54:17 C 02 55 00.46 +07 35 09.3 – V 703
2021-10-25 09:02:01 C 02 55 00.32 +07 34 57.5 – V 703
2021-10-25 11:55:11 C 02 54 59.43 +07 30 48.1 – V T08
2021-10-25 11:59:49 C 02 54 59.33 +07 30 41.0 – V T08
2021-10-25 12:07:51 C 02 54 59.15 +07 30 28.7 – V T08
2021-10-25 12:22:40 C 02 54 58.82 +07 30 05.8 – V T08
2021-10-26 00:03:56 S 02 56 10.570 +07 26 26.34 – V C57
2021-10-26 00:03:56 s 1 +151349.80 2 +18011.310 9190.0 – C57
2021-10-26 01:13:56 S 02 55 55.296 +07 21 41.51 – V C57
2021-10-26 01:13:56 s 1 +154456.02 3 +24762.104 1400.0 – C57
2021-10-26 02:43:56 S 02 55 52.404 +07 19 42.31 – V C57
2021-10-26 02:43:56 s 1 +158096.67 3 +33383.948 4960.0 – C57
2021-10-26 02:53:56 S 02 55 52.051 +07 19 28.88 – V C57
2021-10-26 02:53:56 s 1 +158477.74 5 +34337.334 9760.0 – C57
2021-10-26 03:03:56 S 02 55 51.763 +07 19 15.35 – V C57
2021-10-26 03:03:56 s 1 +158854.26 2 +35289.732 9020.0 – C57
2021-10-26 03:13:56 S 02 55 51.362 +07 19 02.50 – V C57
2021-10-26 03:13:56 s 1 +159226.25 9 +36241.125 2860.0 – C57
2021-10-26 03:23:56 S 02 55 50.995 +07 18 47.59 – V C57
2021-10-26 03:23:56 s 1 +159593.77 0 +37191.498 1400.0 – C57
2021-10-26 03:33:56 S 02 55 50.765 +07 18 35.10 – V C57
2021-10-26 03:33:56 s 1 +159956.83 2 +38140.833 4760.0 – C57
2021-10-26 03:43:56 S 02 55 50.402 +07 18 21.89 – V C57
2021-10-26 03:43:56 s 1 +160315.47 7 +39089.116 3060.0 – C57
2021-10-26 03:53:56 S 02 55 50.057 +07 18 08.17 – V C57
2021-10-26 03:53:56 s 1 +160669.74 0 +40036.329 6420.0 – C57
2021-10-26 04:03:56 S 02 55 49.711 +07 17 54.17 – V C57
2021-10-26 04:03:56 s 1 +161019.65 6 +40982.459 4950.0 – C57
2021-10-26 04:13:56 S 02 55 49.397 +07 17 41.06 – V C57
2021-10-26 04:13:56 s 1 +161365.25 6 +41927.490 8780.0 – C57
2021-10-26 04:23:56 S 02 55 48.977 +07 17 27.10 – V C57
2021-10-26 04:23:56 s 1 +161706.57 5 +42871.409 8020.0 – C57
2021-10-26 04:33:56 S 02 55 48.787 +07 17 14.28 – V C57
2021-10-26 04:33:56 s 1 +162043.64 5 +43814.201 2780.0 – C57
2021-10-26 05:03:56 S 02 55 47.333 +07 16 28.56 – V C57
2021-10-26 05:03:56 s 1 +163029.68 6 +46635.682 1300.0 – C57
2021-10-26 05:13:56 S 02 55 47.227 +07 16 18.66 – V C57
2021-10-26 05:13:56 s 1 +163350.08 3 +47573.835 9260.0 – C57
2021-10-26 06:43:56 S 02 55 43.925 +07 14 11.94 – V C57
2021-10-26 06:43:56 s 1 +166053.29 9 +55962.235 6940.0 – C57
2021-10-26 06:53:56 S 02 55 43.613 +07 13 58.48 – V C57
2021-10-26 06:53:56 s 1 +166334.16 3 +56887.975 360.0 – C57
2021-10-26 07:03:56 S 02 55 43.174 +07 13 43.50 – V C57
2021-10-26 07:03:56 s 1 +166611.23 6 +57812.416 880.0 – 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)