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
2018-03-13 16:11:58 C 11 44 41.03 +02 42 31.1 q D29
2018-03-13 16:33:35 C 11 44 39.90 +02 42 40.1 q D29
2018-03-15 00:24:44 C 11 43 02.68 +02 56 10.2 c J04
2018-03-15 00:41:34 C 11 43 01.79 +02 56 17.4 c J04
2018-03-15 00:58:24 C 11 43 00.91 +02 56 24.5 c J04
2018-03-15 01:15:11 C 11 43 00.01 +02 56 31.6 c J04
2018-03-16 07:37:08 C 11 41 26.17 +03 09 28.7 o 691
2018-03-16 07:47:33 C 11 41 25.60 +03 09 33.6 o 691
2018-03-16 07:58:00 C 11 41 25.06 +03 09 37.0 o 691
2018-03-17 07:59:34 C 11 40 10.25 +03 19 55.4 U 703
2018-03-17 08:07:09 C 11 40 09.83 +03 19 58.8 U 703
2018-03-17 08:14:46 C 11 40 09.44 +03 20 02.1 U 703
2018-03-17 08:22:21 C 11 40 09.04 +03 20 05.2 U 703
2018-03-18 08:36:42 C 11 38 53.446 +03 30 32.34 U F51
2018-03-18 08:54:21 C 11 38 52.499 +03 30 39.91 U F51
2018-03-18 09:11:55 C 11 38 51.554 +03 30 47.50 U F51
2018-03-18 09:29:32 C 11 38 50.602 +03 30 55.10 U F51
2018-03-19 08:35:57 C 11 37 37.81 +03 40 51.8 U G96
2018-03-19 08:44:46 C 11 37 37.34 +03 40 55.6 U G96
2018-03-19 08:52:12 C 11 37 36.91 +03 40 58.7 U G96
2018-03-19 08:59:37 C 11 37 36.52 +03 41 02.1 U G96
2018-03-19 11:49:08 C 11 37 27.65 +03 42 17.1 U T08
2018-03-19 12:04:35 C 11 37 26.78 +03 42 22.5 U T08
2018-03-19 12:19:09 C 11 37 25.98 +03 42 30.0 U T08
2018-03-19 12:34:29 C 11 37 25.21 +03 42 36.8 U T08
2018-03-20 07:10:55 C 11 36 26.76 +03 50 36.2 U 703
2018-03-20 07:18:27 C 11 36 26.37 +03 50 39.6 U 703
2018-03-20 07:25:59 C 11 36 25.96 +03 50 43.6 U 703
2018-03-20 07:33:33 C 11 36 25.53 +03 50 46.4 U 703
2018-03-23 23:12:29 C 11 31 49.10 +04 28 28.5 q 160
2018-03-23 23:15:28 C 11 31 48.93 +04 28 30.1 q 160
2018-03-23 23:18:27 C 11 31 48.80 +04 28 31.3 q 160
2018-03-25 22:04:34 C 11 29 22.26 +04 48 26.1 q 160
2018-03-25 22:07:35 C 11 29 22.09 +04 48 27.5 q 160
2018-03-25 22:10:35 C 11 29 21.88 +04 48 28.7 q 160
2018-04-12 04:58:36 C 11 09 53.10 +07 26 06.2 U G96
2018-04-12 05:07:44 C 11 09 52.74 +07 26 09.1 U G96
2018-04-12 05:16:54 C 11 09 52.36 +07 26 12.0 U G96
2018-04-12 05:26:09 C 11 09 51.98 +07 26 14.9 U G96
2018-04-13 07:15:57 C 11 08 52.086 +07 34 22.96 U F51
2018-04-13 07:32:22 C 11 08 51.435 +07 34 28.05 U F51
2018-04-13 07:48:44 C 11 08 50.787 +07 34 33.13 U F51
2018-04-13 08:05:10 C 11 08 50.134 +07 34 38.21 U F51
2018-04-14 05:47:11 C 11 08 01.22 +07 41 14.0 U 703
2018-04-14 05:55:20 C 11 08 00.92 +07 41 16.5 U 703
2018-04-14 06:03:29 C 11 08 00.60 +07 41 18.7 U 703
2018-04-14 06:11:38 C 11 08 00.29 +07 41 21.5 U 703
2018-04-18 05:39:05 C 11 04 42.98 +08 08 17.9 U 703
2018-04-18 05:46:45 C 11 04 42.69 +08 08 19.9 U 703
2018-04-18 05:54:27 C 11 04 42.42 +08 08 22.0 U 703