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
2025-10-30 07:47:07 C 03 54 17.896 +06 57 24.88 V 703
2025-10-30 07:50:22 C 03 54 18.187 +06 57 18.58 V 703
2025-10-30 07:53:39 C 03 54 18.486 +06 57 12.10 V 703
2025-10-30 21:03:16 C 03 55 47.09 +06 30 02.6 557
2025-10-30 22:02:40 C 03 55 53.10 +06 27 59.5 557
2025-10-30 23:02:04 C 03 55 59.00 +06 25 55.6 557
2025-10-30 23:18:50 C 03 56 00.454 +06 27 05.08 V M22
2025-10-30 23:22:44 C 03 56 00.816 +06 26 56.80 V M22
2025-10-30 23:26:41 C 03 56 01.190 +06 26 48.66 V M22
2025-10-30 23:30:35 C 03 56 01.555 +06 26 40.42 V M22
2025-10-31 00:01:27 C 03 56 04.85 +06 23 50.6 557
2025-10-31 01:00:50 C 03 56 10.68 +06 21 45.0 557
2025-10-31 02:00:12 C 03 56 16.58 +06 19 38.4 557
2025-10-31 03:01:39 C 03 56 22.80 +06 17 26.6 557
2025-10-31 03:50:48 C 03 56 27.91 +06 15 40.5 557
2025-10-31 07:24:29 C 03 56 56.839 +06 08 21.23 V 703
2025-10-31 07:27:47 C 03 56 57.156 +06 08 14.14 V 703
2025-10-31 07:31:05 C 03 56 57.473 +06 08 07.01 V 703
2025-10-31 07:34:24 C 03 56 57.797 +06 07 59.81 V 703
2025-11-01 01:11:19 B 03 59 04.046 +05 28 25.75 X J51
2025-11-01 01:23:02 B 03 59 05.232 +05 27 58.75 X J51
2025-11-01 01:34:47 B 03 59 06.430 +05 27 31.43 X J51
2025-11-01 06:16:44 C 03 59 43.141 +05 16 20.89 V 703
2025-11-01 06:20:04 C 03 59 43.487 +05 16 12.94 V 703
2025-11-01 06:23:23 C 03 59 43.865 +05 16 04.94 V 703
2025-11-01 06:26:43 C 03 59 44.214 +05 15 57.20 V 703
2025-11-01 10:18:44 C 04 00 12.586 +05 06 59.11 V T08
2025-11-01 10:32:21 C 04 00 14.006 +05 06 26.32 V T08
2025-11-01 10:36:23 C 04 00 14.429 +05 06 16.60 V T08
2025-11-01 11:01:51 C 04 00 17.062 +05 05 15.04 V T08
2025-11-02 03:55:24 C 04 02 31.147 +04 24 04.75 V W68
2025-11-02 03:59:19 C 04 02 31.596 +04 23 54.64 V W68
2025-11-02 04:10:32 C 04 02 32.873 +04 23 25.66 V W68
2025-11-02 04:24:21 C 04 02 34.452 +04 22 49.84 V W68
2025-11-02 05:11:51 C 04 02 42.756 +04 19 13.87 V 703
2025-11-02 05:15:07 C 04 02 43.190 +04 19 05.80 V 703
2025-11-02 06:40:48 C 04 02 53.322 +04 15 20.38 V 703
2025-11-02 06:44:04 C 04 02 53.718 +04 15 12.06 V 703
2025-11-02 21:26:49 C 04 04 55.81 +03 35 01.3 X C40
2025-11-02 21:29:24 C 04 04 56.13 +03 34 54.0 X C40
2025-11-02 21:31:58 C 04 04 56.46 +03 34 46.8 X C40
2025-11-02 21:34:33 C 04 04 56.78 +03 34 39.6 X C40
2025-11-02 21:37:08 C 04 04 57.10 +03 34 32.4 X C40
2025-11-02 21:39:42 C 04 04 57.42 +03 34 25.3 X C40
2025-11-02 21:42:16 C 04 04 57.75 +03 34 18.1 X C40
2025-11-02 21:44:50 C 04 04 58.06 +03 34 10.9 X C40
2025-11-02 21:47:18 C 04 04 58.36 +03 34 04.1 X C40
2025-11-02 21:47:32 C 04 05 00.120 +03 35 58.34 V M22
2025-11-02 21:49:39 C 04 04 58.66 +03 33 57.4 X C40
2025-11-02 21:51:26 C 04 05 00.598 +03 35 47.62 V M22
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)