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
2021-10-27 17:03:56 S 02 54 09.715 +06 18 21.13 V C57
2021-10-27 17:03:56 s 1 +170764.71 0 +215169.83 3500.0 C57
2021-10-27 17:13:56 S 02 54 09.180 +06 18 02.30 V C57
2021-10-27 17:13:56 s 1 +170614.94 5 +215788.70 4580.0 C57
2021-10-27 17:23:56 S 02 54 08.698 +06 17 45.20 V C57
2021-10-27 17:23:56 s 1 +170464.07 7 +216406.16 1980.0 C57
2021-10-27 17:33:56 S 02 54 08.191 +06 17 27.42 V C57
2021-10-27 17:33:56 s 1 +170312.10 9 +217022.22 5710.0 C57
2021-10-27 17:43:56 S 02 54 07.709 +06 17 08.92 V C57
2021-10-27 17:43:56 s 1 +170159.04 8 +217636.89 5800.0 C57
2021-10-27 17:53:56 S 02 54 07.181 +06 16 49.58 V C57
2021-10-27 17:53:56 s 1 +170004.89 8 +218250.15 2260.0 C57
2021-10-27 18:03:56 S 02 54 06.626 +06 16 32.41 V C57
2021-10-27 18:03:56 s 1 +169849.66 6 +218862.02 5110.0 C57
2021-10-27 18:13:56 S 02 54 06.197 +06 16 13.30 V C57
2021-10-27 18:13:56 s 1 +169693.35 5 +219472.49 4360.0 C57
2021-10-27 18:23:56 S 02 54 05.676 +06 15 55.58 V C57
2021-10-27 18:23:56 s 1 +169535.97 2 +220081.56 40.0 C57
2021-10-27 18:33:56 S 02 54 05.172 +06 15 37.08 V C57
2021-10-27 18:33:56 s 1 +169377.52 2 +220689.25 2170.0 C57
2021-10-27 18:43:56 S 02 54 04.682 +06 15 19.12 V C57
2021-10-27 18:43:56 s 1 +169218.00 9 +221295.54 750.0 C57
2021-10-27 18:53:56 S 02 54 04.195 +06 15 00.94 V C57
2021-10-27 18:53:56 s 1 +169057.43 9 +221900.45 5810.0 C57
2021-10-27 19:03:56 S 02 54 03.624 +06 14 42.61 V C57
2021-10-27 19:03:56 s 1 +168895.81 8 +222503.97 7370.0 C57
2021-10-27 19:13:56 S 02 54 03.178 +06 14 23.50 V C57
2021-10-27 19:13:56 s 1 +168733.14 9 +223106.10 5430.0 C57
2021-10-27 19:23:56 S 02 54 02.690 +06 14 05.82 V C57
2021-10-27 19:23:56 s 1 +168569.43 8 +223706.84 30.0 C57
2021-10-27 19:33:56 S 02 54 02.194 +06 13 46.88 V C57
2021-10-27 19:33:56 s 1 +168404.69 0 +224306.20 1170.0 C57
2021-10-27 19:43:56 S 02 54 01.637 +06 13 29.28 V C57
2021-10-27 19:43:56 s 1 +168238.91 0 +224904.19 8880.0 C57
2021-10-27 19:53:56 S 02 54 01.178 +06 13 10.74 V C57
2021-10-27 19:53:56 s 1 +168072.10 2 +225500.79 3160.0 C57
2021-10-27 20:03:56 S 02 54 00.614 +06 12 51.98 V C57
2021-10-27 20:03:56 s 1 +167904.27 3 +226096.01 4040.0 C57
2021-10-27 20:13:56 S 02 54 00.098 +06 12 32.90 V C57
2021-10-27 20:13:56 s 1 +167735.42 6 +226689.85 1530.0 C57
2021-10-27 20:23:56 S 02 53 59.621 +06 12 14.83 V C57
2021-10-27 20:23:56 s 1 +167565.56 6 +227282.32 5650.0 C57
2021-10-27 20:33:56 S 02 53 59.131 +06 11 56.33 V C57
2021-10-27 20:33:56 s 1 +167394.69 9 +227873.42 6420.0 C57
2021-10-27 20:43:56 S 02 53 58.613 +06 11 37.28 V C57
2021-10-27 20:43:56 s 1 +167222.82 8 +228463.14 3850.0 C57
2021-10-27 20:53:56 S 02 53 58.109 +06 11 19.50 V C57
2021-10-27 20:53:56 s 1 +167049.96 0 +229051.49 7950.0 C57
2021-10-27 21:03:56 S 02 53 57.562 +06 11 00.89 V C57
2021-10-27 21:03:56 s 1 +166876.09 8 +229638.47 8750.0 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)