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
2014-01-21 04:42:18 C 04 53 28.49 +14 44 39.9 q 703
2014-01-21 04:51:05 C 04 53 28.36 +14 44 41.8 q 703
2014-03-19 06:12:39 C 05 21 08.861 +18 12 38.08 L F51
2014-03-19 06:23:26 C 05 21 09.308 +18 12 39.50 L F51
2015-01-18 11:08:22 C 10 56 12.91 +04 13 58.6 o 691
2015-01-18 11:29:34 C 10 56 12.695 +04 14 02.03 L F51
2015-01-18 11:37:27 C 10 56 12.29 +04 14 03.5 o 691
2015-01-18 11:48:08 C 10 56 12.312 +04 14 04.53 L F51
2015-01-18 12:06:33 C 10 56 11.72 +04 14 06.7 o 691
2015-01-18 12:25:25 C 10 56 11.554 +04 14 09.49 L F51
2015-01-19 12:05:20 C 10 55 43.07 +04 17 24.3 R G45
2015-01-19 12:11:15 C 10 55 42.95 +04 17 24.7 R G45
2015-01-19 12:17:37 C 10 55 42.81 +04 17 25.3 R G45
2015-01-19 12:26:18 C 10 55 42.64 +04 17 27.5 R G45
2015-01-19 12:32:22 C 10 55 42.49 +04 17 28.1 R G45
2015-01-19 12:45:22 C 10 55 42.20 +04 17 30.0 R G45
2015-01-19 12:51:20 C 10 55 42.08 +04 17 30.9 R G45
2015-01-20 12:01:40 C 10 55 12.90 +04 20 52.9 R G45
2015-01-20 12:13:36 C 10 55 12.63 +04 20 55.1 R G45
2015-01-20 12:22:17 C 10 55 12.43 +04 20 55.5 R G45
2015-01-20 12:28:27 C 10 55 12.34 +04 20 55.7 R G45
2015-01-20 12:41:27 C 10 55 12.01 +04 20 58.6 R G45
2015-01-20 12:47:25 C 10 55 11.80 +04 20 59.3 R G45
2015-01-26 11:31:43 C 10 51 38.64 +04 45 30.8 R G45
2015-01-26 11:37:42 C 10 51 38.44 +04 45 31.9 R G45
2015-01-26 11:43:35 C 10 51 38.28 +04 45 33.1 R G45
2015-01-26 11:52:10 C 10 51 37.99 +04 45 35.5 R G45
2015-01-26 11:58:14 C 10 51 37.85 +04 45 35.7 R G45
2015-01-26 12:04:12 C 10 51 37.69 +04 45 36.8 R G45
2015-01-26 12:04:18 C 10 51 37.64 +04 45 38.2 R G45
2015-01-26 12:11:08 C 10 51 37.46 +04 45 38.5 R G45
2015-01-26 12:17:01 C 10 51 37.29 +04 45 40.1 R G45
2015-02-10 06:40:34 C 10 39 04.03 +06 12 30.0 o 691
2015-02-10 07:26:06 C 10 39 02.08 +06 12 43.6 o 691
2015-02-10 07:55:17 C 10 39 00.81 +06 12 52.1 o 691
2015-02-13 09:30:28 C 10 35 50.841 +06 34 49.26 L F51
2015-02-13 09:47:50 C 10 35 50.067 +06 34 54.43 L F51
2015-02-13 16:57:44 C 10 35 30.98 +06 37 05.1 q D29
2015-02-13 17:24:24 C 10 35 29.75 +06 37 13.4 q D29
2015-02-13 17:51:04 C 10 35 28.51 +06 37 21.6 q D29
2015-02-15 10:05:55 C 10 33 40.464 +06 49 52.20 L F51
2015-02-15 10:23:39 C 10 33 39.631 +06 49 57.83 L F51
2015-02-15 10:41:26 C 10 33 38.811 +06 50 03.38 L F51
2015-02-15 10:59:11 C 10 33 37.977 +06 50 08.95 L F51
2015-02-17 18:24:52 C 10 31 05.15 +07 07 46.4 q D29
2015-02-17 18:52:49 C 10 31 03.87 +07 07 55.2 q D29
2015-02-17 19:20:45 C 10 31 02.50 +07 08 04.4 q D29
2015-02-27 06:05:49 C 10 20 11.58 +08 23 25.7 q 703
2015-02-27 06:20:19 C 10 20 10.82 +08 23 32.0 q 703
2015-02-27 06:27:35 C 10 20 10.35 +08 23 34.3 q 703