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
2010-05-26 05:24:23 C 13 23 04.88 +04 14 14.5 o H10
2010-05-31 21:18:17 C 13 18 00.73 +04 55 38.0 u J87
2010-05-31 21:25:11 C 13 18 00.46 +04 55 39.8 u J87
2010-05-31 21:32:04 C 13 18 00.25 +04 55 41.4 u J87
2010-06-02 05:00:53 C 13 17 02.74 +05 03 11.4 r H53
2010-06-02 05:05:53 C 13 17 02.53 +05 03 12.8 r H53
2010-06-02 05:12:15 C 13 17 02.31 +05 03 13.9 r H53
2010-06-02 05:17:17 C 13 17 02.15 +05 03 15.2 r H53
2010-06-02 05:22:18 C 13 17 02.01 +05 03 16.1 r H53
2010-06-02 05:28:27 C 13 17 01.80 +05 03 17.1 r H53
2010-06-05 05:31:05 C 13 15 11.19 +05 17 26.9 r 703
2010-06-05 05:41:47 C 13 15 10.94 +05 17 28.5 r 703
2010-06-05 05:52:28 C 13 15 10.65 +05 17 30.7 r 703
2010-06-05 06:03:02 C 13 15 10.36 +05 17 32.3 r 703
2010-06-09 03:58:40 C 13 13 29.39 +05 29 42.0 o 704
2010-06-09 04:14:05 C 13 13 29.12 +05 29 43.2 o 704
2010-06-09 04:29:17 C 13 13 28.83 +05 29 45.1 o 704
2010-06-09 04:44:37 C 13 13 28.57 +05 29 46.5 o 704
2010-06-09 04:59:53 C 13 13 28.33 +05 29 47.6 o 704
2010-06-11 21:26:57 C 13 12 47.89 +05 34 04.5 w A06
2010-06-11 21:56:19 C 13 12 47.58 +05 34 05.4 w A06
2010-06-11 22:43:33 C 13 12 47.08 +05 34 07.5 w A06
2010-06-16 20:21:14 C 13 12 35.22 +05 33 48.7 17.1 u A81
2010-06-23 03:20:25 C 13 14 13.09 +05 19 09.7 r H53
2010-06-23 03:24:28 C 13 14 13.13 +05 19 09.6 r H53
2010-06-23 03:28:52 C 13 14 13.13 +05 19 08.5 r H53
2010-06-23 03:32:51 C 13 14 13.26 +05 19 07.8 r H53
2010-06-23 03:37:52 C 13 14 13.36 +05 19 07.6 r H53
2010-06-26 04:21:38 C 13 15 44.23 +05 06 45.9 r H53
2010-06-26 04:28:43 C 13 15 44.39 +05 06 42.9 r H53
2010-06-26 04:35:43 C 13 15 44.59 +05 06 42.1 r H53
2010-06-26 04:44:06 C 13 15 44.86 +05 06 41.6 r H53
2010-06-26 04:52:07 C 13 15 44.90 +05 06 39.4 r H53
2010-06-26 05:00:22 C 13 15 45.10 +05 06 38.5 r H53
2010-07-03 21:22:39 S 13 21 39.209 +04 21 09.94 L C51
2010-07-04 00:33:10 S 13 21 46.75 +04 20 12.9 L C51
2010-07-04 03:43:41 S 13 21 54.36 +04 19 15.0 L C51
2010-07-04 06:54:12 S 13 22 02.02 +04 18 16.9 L C51
2010-07-04 10:04:43 S 13 22 09.75 +04 17 18.5 L C51
2010-07-04 11:39:53 S 13 22 13.61 +04 16 49.5 L C51
2010-07-04 13:15:14 S 13 22 17.51 +04 16 19.7 L C51
2010-07-04 14:50:25 S 13 22 21.40 +04 15 50.5 L C51
2010-07-04 16:25:45 S 13 22 25.31 +04 15 20.8 L C51
2010-07-04 18:00:55 S 13 22 29.23 +04 14 51.2 L C51
2010-07-04 19:36:05 S 13 22 33.17 +04 14 21.8 L C51
2010-07-04 21:11:26 S 13 22 37.11 +04 13 51.6 L C51
2010-07-05 00:21:58 S 13 22 45.06 +04 12 51.6 L C51
2010-07-05 03:32:29 S 13 22 53.03 +04 11 51.2 L C51
2010-07-05 06:43:00 S 13 23 01.07 +04 10 50.9 L C51
2010-07-05 09:53:20 S 13 23 09.15 +04 09 50.5 L C51