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
2025-11-02 21:52:01 C 04 04 58.97 +03 33 50.8 X C40
2025-11-02 21:54:23 C 04 04 59.26 +03 33 44.2 X C40
2025-11-02 21:59:16 C 04 05 01.567 +03 35 25.84 V M22
2025-11-02 22:15:01 C 04 05 03.511 +03 34 41.70 V M22
2025-11-03 02:32:17 B 04 05 38.350 +03 20 59.86 X J51
2025-11-03 02:41:29 B 04 05 39.473 +03 20 33.32 X J51
2025-11-03 02:50:41 B 04 05 40.591 +03 20 07.04 X J51
2025-11-03 05:02:16 C 04 06 04.964 +03 13 41.23 V 703
2025-11-03 05:05:08 C 04 06 05.342 +03 13 33.10 V 703
2025-11-03 05:08:00 C 04 06 05.742 +03 13 24.74 V 703
2025-11-03 05:10:53 C 04 06 06.102 +03 13 16.50 V 703
2025-11-04 01:43:37 C 04 09 12.235 +02 11 14.89 V R17
2025-11-04 02:03:59 C 04 09 14.978 +02 10 10.34 V R17
2025-11-04 02:24:23 C 04 09 17.722 +02 09 05.72 V R17
2025-11-04 02:44:45 C 04 09 20.479 +02 08 01.03 V R17
2025-11-04 04:14:26 V 04 09 38.88 +02 02 53.8 V 270
2025-11-04 04:14:26 v 1 270.60691 +43.01211 270
2025-11-04 04:20:47 V 04 09 39.78 +02 02 33.9 V 270
2025-11-04 04:20:47 v 1 270.60691 +43.01211 270
2025-11-04 04:26:44 V 04 09 40.67 +02 02 14.0 V 270
2025-11-04 04:26:44 v 1 270.60691 +43.01211 270
2025-11-04 04:32:52 V 04 09 41.57 +02 01 55.5 V 270
2025-11-04 04:32:52 v 1 270.60691 +43.01211 270
2025-11-04 22:12:31 B 04 12 41.688 +01 03 20.27 X J51
2025-11-04 22:24:00 B 04 12 43.558 +01 02 40.42 X J51
2025-11-04 22:35:29 B 04 12 45.420 +01 02 00.60 X J51
2025-11-05 23:45:54 B 04 17 22.829 -00 30 52.52 X J51
2025-11-06 00:11:33 B 04 17 27.238 -00 32 33.04 X J51
2025-11-06 00:36:44 B 04 17 31.531 -00 34 11.96 X J51
2025-11-06 07:11:10 V 04 18 48.96 -01 00 33.8 V 270
2025-11-06 07:11:10 v 1 253.12539 +32.32087 270
2025-11-06 07:17:08 V 04 18 50.04 -01 00 57.9 V 270
2025-11-06 07:17:08 v 1 253.12539 +32.32087 270
2025-11-06 07:23:13 V 04 18 51.11 -01 01 22.3 V 270
2025-11-06 07:23:13 v 1 253.12539 +32.32087 270
2025-11-06 07:29:58 V 04 18 52.29 -01 01 50.0 V 270
2025-11-06 07:29:58 v 1 253.12539 +32.32087 270
2025-11-06 13:39:09 V 04 20 09.82 -01 27 17.0 V 270
2025-11-06 13:39:09 v 1 140.17439 +36.06241 270
2025-11-06 13:43:31 V 04 20 10.72 -01 27 36.3 V 270
2025-11-06 13:43:31 v 1 140.17439 +36.06241 270
2025-11-06 13:51:43 V 04 20 12.12 -01 28 08.7 V 270
2025-11-06 13:51:43 v 1 140.17439 +36.06241 270
2025-11-06 13:57:17 V 04 20 13.26 -01 28 33.6 V 270
2025-11-06 13:57:17 v 1 140.17439 +36.06241 270
2025-11-06 20:52:25 C 04 21 40.59 -01 58 18.2 X C40
2025-11-06 20:54:59 C 04 21 41.09 -01 58 29.3 X C40
2025-11-06 20:57:33 C 04 21 41.58 -01 58 40.5 X C40
2025-11-06 21:00:06 C 04 21 42.08 -01 58 51.6 X C40
2025-11-06 21:02:40 C 04 21 42.57 -01 59 02.7 X C40
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)