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
2010-07-05 09:53:31 S 13 23 09.14 +04 09 49.7 L C51
2010-07-06 03:52:30 C 13 23 55.13 +04 03 52.3 17.8 c 704
2010-07-06 04:08:39 C 13 23 55.78 +04 03 45.7 17.8 c 704
2010-07-06 04:25:16 C 13 23 56.43 +04 03 41.3 17.7 c 704
2010-07-06 04:41:33 C 13 23 57.08 +04 03 35.6 17.4 c 704
2010-07-06 04:57:55 C 13 23 57.82 +04 03 29.8 17.4 c 704
2010-09-05 02:26:59 C 16 06 04.40 -13 49 28.8 r H53
2010-09-05 02:28:59 C 16 06 04.84 -13 49 31.3 r H53
2010-09-05 02:30:59 C 16 06 05.26 -13 49 34.2 r H53
2010-09-05 02:33:00 C 16 06 05.66 -13 49 36.2 r H53
2010-09-05 02:35:00 C 16 06 06.08 -13 49 39.2 r H53
2010-09-05 02:37:00 C 16 06 06.57 -13 49 41.1 r H53
2010-09-07 02:21:39 C 16 16 43.34 -14 48 04.5 r H53
2010-09-07 02:24:08 C 16 16 43.90 -14 48 07.7 r H53
2010-09-07 02:26:38 C 16 16 44.44 -14 48 10.6 r H53
2010-09-07 02:29:09 C 16 16 44.97 -14 48 13.6 r H53
2010-09-07 02:31:38 C 16 16 45.55 -14 48 16.6 r H53
2010-09-07 02:34:09 C 16 16 46.15 -14 48 19.6 r H53
2010-09-12 02:31:55 C 16 46 22.30 -17 18 33.7 r H53
2010-09-12 02:37:02 C 16 46 23.70 -17 18 40.3 r H53
2010-09-12 02:40:03 C 16 46 24.49 -17 18 44.7 r H53
2010-09-12 02:44:04 C 16 46 25.47 -17 18 49.6 r H53
2010-09-12 02:47:04 C 16 46 26.24 -17 18 54.4 r H53
2010-09-25 03:56:03 S 18 25 16.956 -23 06 28.76 L C51
2010-09-25 07:06:34 S 18 26 25.488 -23 09 01.62 L C51
2010-09-25 10:17:05 S 18 27 34.438 -23 11 34.69 L C51
2010-09-25 11:52:15 S 18 28 08.870 -23 12 49.86 L C51
2010-09-25 13:27:25 S 18 28 43.301 -23 14 04.74 L C51
2010-09-25 16:37:57 S 18 29 52.351 -23 16 32.70 L C51
2010-09-25 18:13:07 S 18 30 26.892 -23 17 45.96 L C51
2010-09-26 00:34:09 S 18 32 45.468 -23 22 35.69 L C51
2010-09-26 06:55:00 S 18 35 04.406 -23 27 16.85 L C51
2010-10-01 02:02:44 C 19 17 56.75 -24 29 00.1 16.1 c 704
2010-10-01 02:22:16 C 19 18 03.94 -24 29 06.4 16.1 c 704
2010-10-01 02:42:03 C 19 18 11.16 -24 29 11.8 16.4 c 704
2010-10-01 03:01:31 C 19 18 18.36 -24 29 18.3 16.3 c 704
2010-10-01 03:20:56 C 19 18 25.48 -24 29 24.0 16.5 c 704
2010-10-02 02:04:03 C 19 26 58.92 -24 35 38.6 15.3 c 704
2010-10-02 02:23:23 C 19 27 05.95 -24 35 43.6 16.4 c 704
2010-10-02 02:42:41 C 19 27 13.10 -24 35 47.4 16.1 c 704
2010-10-02 03:02:00 C 19 27 20.17 -24 35 50.7 19.2 c 704
2010-10-02 03:21:16 C 19 27 27.28 -24 35 55.8 15.9 c 704
2010-10-07 02:04:18 C 20 11 26.25 -24 36 17.8 15.7 c 704
2010-10-07 02:24:02 C 20 11 33.19 -24 36 13.5 16.1 c 704
2010-10-07 02:43:42 C 20 11 40.13 -24 36 09.4 15.7 c 704
2010-10-07 03:03:27 C 20 11 47.07 -24 36 04.8 15.6 c 704
2010-10-07 03:23:07 C 20 11 54.03 -24 35 59.8 15.9 c 704
2010-10-08 01:55:43 C 20 20 00.07 -24 30 13.4 15.1 c 704
2010-10-08 02:15:29 C 20 20 06.92 -24 30 07.7 17.5 c 704
2010-10-08 02:35:26 C 20 20 13.88 -24 30 02.0 16.0 c 704