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
2021-09-10 09:54:00 C 02 25 41.97 +15 14 48.6 V 703
2021-09-10 10:01:38 C 02 25 42.32 +15 14 48.5 V 703
2021-09-10 11:15:34 C 02 25 46.595 +15 14 57.01 U F52
2021-09-10 11:33:04 C 02 25 47.403 +15 14 58.66 U F52
2021-09-10 11:50:34 C 02 25 48.211 +15 15 00.23 U F52
2021-09-10 12:08:06 C 02 25 49.008 +15 15 01.81 U F52
2021-09-13 08:26:57 C 02 29 12.30 +15 19 19.3 V 703
2021-09-13 08:42:31 C 02 29 12.99 +15 19 20.6 V 703
2021-09-13 08:50:18 C 02 29 13.43 +15 19 23.1 V 703
2021-09-16 08:42:53 C 02 32 37.35 +15 21 17.6 V 703
2021-09-16 08:50:28 C 02 32 37.83 +15 21 19.5 V 703
2021-09-16 08:58:03 C 02 32 38.35 +15 21 20.9 V 703
2021-09-16 09:58:23 C 02 32 40.61 +15 21 20.3 V G96
2021-09-16 10:08:11 C 02 32 41.01 +15 21 20.4 V G96
2021-09-16 10:16:21 C 02 32 41.33 +15 21 20.4 V G96
2021-09-16 10:24:32 C 02 32 41.68 +15 21 19.8 V G96
2021-09-28 10:13:23 C 02 44 26.01 +14 56 13.6 V T08
2021-09-28 10:18:02 C 02 44 26.10 +14 56 12.0 V T08
2021-09-28 11:08:41 C 02 44 27.55 +14 56 02.5 V T08
2021-09-28 11:13:55 C 02 44 27.66 +14 56 01.6 V T08
2021-09-28 11:16:34 C 02 44 27.74 +14 56 01.2 V T08
2021-09-28 11:17:14 C 02 44 27.76 +14 56 01.4 V T08
2021-09-28 11:20:34 C 02 44 27.84 +14 56 00.6 V T08
2021-09-28 12:10:32 C 02 44 29.21 +14 55 50.7 V T08
2021-09-30 12:36:50 C 02 46 06.02 +14 45 03.9 V T05
2021-09-30 12:41:01 C 02 46 06.11 +14 45 02.6 V T05
2021-09-30 12:50:33 C 02 46 06.33 +14 45 00.1 V T05
2021-09-30 13:36:49 C 02 46 07.46 +14 44 48.6 V T05
2021-10-02 13:46:37 C 02 47 36.62 +14 31 45.0 V T08
2021-10-02 13:56:36 C 02 47 36.85 +14 31 41.3 V T08
2021-10-02 14:05:55 C 02 47 37.02 +14 31 38.7 V T08
2021-10-03 08:26:42 C 02 48 10.31 +14 25 54.7 V 703
2021-10-03 08:36:29 C 02 48 10.53 +14 25 51.8 V 703
2021-10-03 08:46:07 C 02 48 10.83 +14 25 47.8 V 703
2021-10-03 08:53:43 C 02 48 10.97 +14 25 45.3 V 703
2021-10-04 09:55:00 C 02 48 53.956 +14 17 30.87 U F52
2021-10-04 09:56:49 C 02 48 53.998 +14 17 30.35 U F52
2021-10-04 10:12:23 C 02 48 54.302 +14 17 25.14 U F52
2021-10-04 10:14:13 C 02 48 54.343 +14 17 24.62 U F52
2021-10-04 10:29:48 C 02 48 54.644 +14 17 19.40 U F52
2021-10-04 10:31:37 C 02 48 54.689 +14 17 18.90 U F52
2021-10-04 10:47:17 C 02 48 54.980 +14 17 13.56 U F52
2021-10-04 10:49:08 C 02 48 55.019 +14 17 12.98 U F52
2021-10-04 12:47:15 C 02 48 57.18 +14 16 32.3 V T05
2021-10-04 12:57:57 C 02 48 57.38 +14 16 28.2 V T05
2021-10-04 13:43:26 C 02 48 58.21 +14 16 12.1 V T05
2021-10-04 13:49:54 C 02 48 58.34 +14 16 09.7 V T05
2021-10-05 04:18:39 C 02 49 23.38 +14 11 20.7 o W92
2021-10-05 04:32:09 C 02 49 23.59 +14 11 18.1 o W92
2021-10-05 04:42:22 C 02 49 23.81 +14 11 13.3 o W92
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)