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
2025-10-03 11:18:00 C 03 10 05.095 +15 40 47.03 V T05
2025-10-04 11:13:54 C 03 11 26.998 +15 35 07.12 V T08
2025-10-04 11:16:11 C 03 11 27.108 +15 35 06.68 V T08
2025-10-04 11:20:50 C 03 11 27.314 +15 35 05.86 V T08
2025-10-05 08:01:37 C 03 12 38.200 +15 29 36.82 V G96
2025-10-05 08:09:00 C 03 12 38.560 +15 29 34.94 V G96
2025-10-05 08:16:22 C 03 12 38.920 +15 29 33.00 V G96
2025-10-05 08:23:46 C 03 12 39.290 +15 29 31.16 V G96
2025-10-11 16:40:06 C 03 21 27.218 +14 35 18.53 V P07
2025-10-11 17:43:02 C 03 21 30.298 +14 34 50.27 V P07
2025-10-11 18:51:05 C 03 21 33.564 +14 34 18.98 V P07
2025-10-11 19:47:30 C 03 21 36.307 +14 33 52.45 V P07
2025-10-11 20:45:27 C 03 21 39.170 +14 33 24.12 V P07
2025-10-11 20:45:35 C 03 21 39.192 +14 33 24.34 V P07
2025-10-12 02:41:24 C 03 22 01.834 +14 30 06.12 V R17
2025-10-12 03:01:47 C 03 22 02.815 +14 29 56.51 V R17
2025-10-12 03:22:09 C 03 22 03.811 +14 29 46.79 V R17
2025-10-12 03:42:30 C 03 22 04.802 +14 29 36.96 V R17
2025-10-12 12:48:10 C 03 22 37.150 +14 25 17.69 V T05
2025-10-12 12:53:34 C 03 22 37.394 +14 25 14.99 V T05
2025-10-12 13:15:04 C 03 22 38.450 +14 25 04.08 V T05
2025-10-12 13:30:19 C 03 22 39.185 +14 24 56.45 V T05
2025-10-15 10:23:52 C 03 26 49.716 +13 46 56.90 X F51
2025-10-15 10:39:53 C 03 26 50.525 +13 46 47.29 X F51
2025-10-15 10:55:57 C 03 26 51.327 +13 46 37.74 X F51
2025-10-15 11:12:09 C 03 26 52.133 +13 46 27.98 X F51
2025-10-16 01:41:34 C 03 27 43.992 +13 37 58.04 V M22
2025-10-16 01:45:28 C 03 27 44.191 +13 37 55.34 V M22
2025-10-16 01:56:18 B 03 27 45.61 +13 36 53.0 Z R73
2025-10-16 02:01:20 B 03 27 45.91 +13 36 49.9 Z R73
2025-10-16 02:06:22 B 03 27 46.23 +13 36 47.0 Z R73
2025-10-16 02:11:24 B 03 27 46.48 +13 36 43.7 Z R73
2025-10-16 02:37:38 C 03 27 46.879 +13 37 20.75 V M22
2025-10-16 02:44:36 C 03 27 47.258 +13 37 16.21 V M22
2025-10-16 10:38:30 C 03 28 19.226 +13 31 31.12 V T08
2025-10-16 10:48:49 C 03 28 19.769 +13 31 24.42 V T08
2025-10-16 11:04:09 C 03 28 20.515 +13 31 14.70 V T08
2025-10-16 11:09:27 C 03 28 20.794 +13 31 11.28 V T08
2025-10-16 21:39:16 B 03 29 01.21 +13 23 43.2 Z R73
2025-10-16 21:46:49 B 03 29 01.62 +13 23 38.2 Z R73
2025-10-16 21:54:22 B 03 29 02.06 +13 23 33.3 Z R73
2025-10-16 21:59:24 B 03 29 02.34 +13 23 29.8 Z R73
2025-10-17 19:41:13 C 03 30 24.26 +13 07 58.0 V M31
2025-10-17 19:43:16 C 03 30 24.33 +13 07 56.7 V M31
2025-10-17 19:45:21 C 03 30 24.50 +13 07 55.2 V M31
2025-10-17 19:47:27 C 03 30 24.62 +13 07 53.6 V M31
2025-10-17 19:49:30 C 03 30 24.73 +13 07 52.3 V M31
2025-10-17 19:51:35 C 03 30 24.89 +13 07 50.5 V M31
2025-10-17 19:53:38 C 03 30 24.98 +13 07 49.1 V M31
2025-10-17 19:55:43 C 03 30 25.12 +13 07 48.2 V M31
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)