IAA RAS IAA Minor Planet Database

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
2021-06-15 20:56:40 C 13 18 55.78 +05 47 27.8 – V C40
2021-06-15 21:12:18 C 13 18 55.71 +05 47 27.8 – V C40
2021-06-15 21:29:40 C 13 18 55.61 +05 47 27.6 – V C40
2021-06-16 18:55:47 C 13 18 54.47 +05 47 19.9 – V C40
2021-06-16 19:07:57 C 13 18 54.44 +05 47 19.8 – V C40
2021-06-16 19:37:30 C 13 18 54.37 +05 47 19.4 – V C40
2021-06-17 07:01:31 C 13 18 54.85 +05 47 13.0 – V T05
2021-06-17 07:06:47 C 13 18 54.83 +05 47 12.9 – V T05
2021-06-17 07:14:11 C 13 18 54.80 +05 47 12.7 – V T05
2021-06-17 07:28:44 C 13 18 54.76 +05 47 12.2 – V T05
2021-06-17 18:13:08 C 13 18 55.87 +05 46 48.1 – V C40
2021-06-17 18:16:37 C 13 18 55.88 +05 46 48.0 – V C40
2021-06-17 18:20:06 C 13 18 55.88 +05 46 48.0 – V C40
2021-06-17 18:23:35 C 13 18 55.87 +05 46 47.8 – V C40
2021-06-17 18:30:31 C 13 18 55.86 +05 46 47.4 – V C40
2021-06-17 18:32:16 C 13 18 55.86 +05 46 47.5 – V C40
2021-06-17 18:35:45 C 13 18 55.85 +05 46 47.4 – V C40
2021-06-17 18:40:57 C 13 18 55.85 +05 46 47.1 – V C40
2021-06-17 18:42:41 C 13 18 55.86 +05 46 47.1 – V C40
2021-06-17 18:44:26 C 13 18 55.85 +05 46 47.2 – V C40
2021-06-17 18:51:22 C 13 18 55.84 +05 46 46.8 – V C40
2021-06-17 18:53:08 C 13 18 55.84 +05 46 46.7 – V C40
2021-06-17 18:54:51 C 13 18 55.85 +05 46 46.8 – V C40
2021-06-17 18:58:20 C 13 18 55.84 +05 46 46.7 – V C40
2021-06-17 19:01:37 C 13 18 55.83 +05 46 46.6 – V C40
2021-06-17 19:03:20 C 13 18 55.83 +05 46 46.5 – V C40
2021-06-17 19:05:05 C 13 18 55.84 +05 46 46.5 – V C40
2021-06-17 19:08:34 C 13 18 55.83 +05 46 46.2 – V C40
2021-06-17 19:10:18 C 13 18 55.83 +05 46 46.4 – V C40
2021-06-17 19:12:01 C 13 18 55.82 +05 46 46.1 – V C40
2021-06-17 19:15:30 C 13 18 55.82 +05 46 46.1 – V C40
2021-06-17 19:17:15 C 13 18 55.83 +05 46 46.1 – V C40
2021-06-17 19:18:59 C 13 18 55.82 +05 46 46.0 – V C40
2021-06-17 19:22:28 C 13 18 55.81 +05 46 45.8 – V C40
2021-06-17 19:25:57 C 13 18 55.82 +05 46 45.6 – V C40
2021-06-17 19:31:09 C 13 18 55.81 +05 46 45.6 – V C40
2021-06-17 19:32:53 C 13 18 55.81 +05 46 45.4 – V C40
2021-06-17 19:38:07 C 13 18 55.81 +05 46 45.3 – V C40
2021-06-17 19:39:51 C 13 18 55.80 +05 46 45.4 – V C40
2021-06-17 19:43:20 C 13 18 55.80 +05 46 45.0 – V C40
2021-06-17 19:45:04 C 13 18 55.81 +05 46 45.1 – V C40
2021-06-17 19:46:49 C 13 18 55.80 +05 46 44.9 – V C40
2021-06-17 19:48:32 C 13 18 55.80 +05 46 44.8 – V C40
2021-06-17 19:50:18 C 13 18 55.79 +05 46 44.9 – V C40
2021-06-18 02:14:21 C 13 18 56.95 +05 46 32.8 – V W53
2021-06-18 02:22:42 C 13 18 56.90 +05 46 31.8 – V W53
2021-06-18 02:27:48 C 13 18 56.94 +05 46 32.5 – V W53
2021-06-18 03:52:41 C 13 18 56.79 +05 46 30.6 – V W53
2021-06-18 03:57:48 C 13 18 56.95 +05 46 28.6 – V W53
2021-06-18 04:02:54 C 13 18 56.94 +05 46 29.1 – V W53