12923 Zephyr (1999 GK4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4927419454 ± 6.38e-09
Semi-major axis (a)1.9622252115 AU ± 6.65e-10
Inclination (i)5.30954016° ± 9.22e-07
Long. of Asc. Node (Ω)168.07921894° ± 1.08e-05
Arg. of Perihelion (ω)147.21088394° ± 1.08e-05
Mean Anomaly (M)194.87677812° ± 9.76e-07
Mean Motion (n)0.3585824243°/day ± 1.82e-10
Perihelion dist (q)0.99535454 AU ± 1.25e-08
Aphelion dist (Q)2.92909588 AU ± 1.25e-08
Orbital Period2.74867427 yr ± 1.40e-09
Physical Parameters
H (abs. magnitude)15.80
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.251″
Uncertainty0
Orbit TypeApollo
MOID0.019399 AU
Observations Used2585
Oppositions45
Arc Total1955-2026
First Observation Used1955-04-21
Last Observation Used2026-01-11
Observations (2948)
Date Type RA Dec Mag Band Observatory
2021-05-28 06:42:33 C 13 29 16.402 +04 27 44.57 Z U76
2021-05-28 07:02:10 C 13 29 15.50 +04 27 51.6 X U76
2021-05-28 07:03:45 C 13 29 15.425 +04 27 52.06 Z U76
2021-05-28 07:23:23 C 13 29 14.53 +04 27 59.1 X U76
2021-05-28 07:24:09 C 13 29 14.491 +04 27 59.29 Z U76
2021-05-28 09:50:41 C 13 29 08.22 +04 28 55.3 V T05
2021-05-28 10:05:14 C 13 29 07.54 +04 29 00.5 V T05
2021-05-28 10:20:30 C 13 29 06.85 +04 29 05.9 V T05
2021-05-28 10:25:07 C 13 29 06.63 +04 29 07.6 V T05
2021-05-28 20:12:49 C 13 28 42.69 +04 32 29.1 V K83
2021-05-28 20:17:01 C 13 28 42.50 +04 32 30.5 V K83
2021-05-29 17:15:24 C 13 27 50.87 +04 39 38.9 Y N42
2021-05-29 17:16:47 C 13 27 50.81 +04 39 39.3 Y N42
2021-05-29 17:18:11 C 13 27 50.76 +04 39 39.8 Y N42
2021-05-29 17:19:35 C 13 27 50.69 +04 39 40.3 Y N42
2021-05-29 17:20:59 C 13 27 50.63 +04 39 40.7 Y N42
2021-05-29 17:22:23 C 13 27 50.57 +04 39 41.2 Y N42
2021-05-29 17:23:47 C 13 27 50.51 +04 39 41.7 Y N42
2021-05-29 17:25:10 C 13 27 50.45 +04 39 42.1 Y N42
2021-05-29 17:26:34 C 13 27 50.39 +04 39 42.6 Y N42
2021-05-29 17:27:57 C 13 27 50.33 +04 39 43.1 Y N42
2021-05-29 17:29:21 C 13 27 50.27 +04 39 43.5 Y N42
2021-05-29 17:30:45 C 13 27 50.21 +04 39 44.0 Y N42
2021-05-29 17:32:09 C 13 27 50.15 +04 39 44.4 Y N42
2021-05-29 17:33:32 C 13 27 50.09 +04 39 44.9 Y N42
2021-05-29 17:34:56 C 13 27 50.03 +04 39 45.3 Y N42
2021-05-29 17:55:11 C 13 27 49.16 +04 39 52.0 Y N42
2021-05-29 17:56:34 C 13 27 49.10 +04 39 52.4 Y N42
2021-05-29 17:57:58 C 13 27 49.04 +04 39 52.9 Y N42
2021-05-29 17:59:21 C 13 27 48.98 +04 39 53.3 Y N42
2021-05-29 18:00:46 C 13 27 48.92 +04 39 53.8 Y N42
2021-05-29 18:02:10 C 13 27 48.86 +04 39 54.3 Y N42
2021-05-29 18:03:34 C 13 27 48.80 +04 39 54.8 Y N42
2021-05-29 18:04:58 C 13 27 48.74 +04 39 55.3 Y N42
2021-05-29 18:06:21 C 13 27 48.67 +04 39 55.6 Y N42
2021-05-29 18:07:45 C 13 27 48.62 +04 39 56.1 Y N42
2021-05-29 18:09:09 C 13 27 48.56 +04 39 56.6 Y N42
2021-05-29 18:10:33 C 13 27 48.50 +04 39 57.0 Y N42
2021-05-29 18:11:57 C 13 27 48.44 +04 39 57.5 Y N42
2021-05-29 18:13:20 C 13 27 48.38 +04 39 57.9 Y N42
2021-05-29 18:14:44 C 13 27 48.32 +04 39 58.3 Y N42
2021-05-30 08:07:09 C 13 27 15.86 +04 44 35.5 V T08
2021-05-30 08:08:29 C 13 27 15.80 +04 44 36.0 V T08
2021-05-30 08:11:48 C 13 27 15.65 +04 44 37.1 V T08
2021-05-30 08:13:48 C 13 27 15.57 +04 44 37.7 V T08
2021-05-30 08:24:27 C 13 27 15.11 +04 44 41.0 V T08
2021-05-30 08:37:48 C 13 27 14.54 +04 44 45.2 V T08
2021-05-30 08:41:52 C 13 27 14.36 +04 44 46.6 V T08
2021-05-30 11:38:52 C 13 27 08.359 +04 45 54.83 V P07
2021-05-30 12:40:49 C 13 27 05.726 +04 46 14.38 V P07