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
2010-03-24 00:03:04 C 14 32 18.46 -09 12 54.8 17.8 u C20
2010-03-24 00:05:11 C 14 32 18.44 -09 12 54.2 17.7 u C20
2010-03-24 00:07:17 C 14 32 18.42 -09 12 53.5 17.8 u C20
2010-03-24 01:39:25 C 14 32 17.77 -09 12 25.5 17.1 u 084
2010-03-24 01:44:36 C 14 32 17.75 -09 12 25.2 17.6 u 084
2010-03-24 21:01:10 C 14 32 09.97 -09 06 19.3 17.6 u C20
2010-03-24 21:05:24 C 14 32 09.94 -09 06 17.9 17.5 u C20
2010-03-25 00:08:59 C 14 32 08.25 -09 05 20.8 18.1 o 084
2010-03-27 21:38:05 C 14 31 25.53 -08 41 46.1 17.3 u C20
2010-03-27 21:42:19 C 14 31 25.46 -08 41 44.6 17.4 u C20
2010-03-29 00:54:24 C 14 31 02.79 -08 31 50.2 17.7 u C20
2010-03-29 00:58:38 C 14 31 02.72 -08 31 48.5 17.4 u C20
2010-04-05 23:05:28 C 14 26 57.94 -07 11 40.1 r B09
2010-04-05 23:07:35 C 14 26 57.85 -07 11 39.0 r B09
2010-04-05 23:09:23 C 14 26 57.76 -07 11 38.2 r B09
2010-04-08 17:08:33 C 14 24 54.98 -06 39 21.5 r D29
2010-04-08 17:31:35 C 14 24 54.16 -06 39 10.0 r D29
2010-04-08 17:54:47 C 14 24 53.24 -06 38 57.0 r D29
2010-04-08 18:17:53 C 14 24 52.48 -06 38 46.4 r D29
2010-04-09 07:47:30 C 14 24 25.20 -06 31 53.8 r 703
2010-04-09 07:56:48 C 14 24 24.87 -06 31 49.1 r 703
2010-04-09 08:06:06 C 14 24 24.51 -06 31 44.3 r 703
2010-04-09 08:15:21 C 14 24 24.15 -06 31 39.4 r 703
2010-04-09 08:37:00 C 14 24 23.38 -06 31 28.1 16.7 c 704
2010-04-09 08:53:22 C 14 24 22.74 -06 31 19.7 17.0 c 704
2010-04-09 09:09:59 C 14 24 22.13 -06 31 11.2 16.8 c 704
2010-04-09 09:27:00 C 14 24 21.48 -06 31 02.4 17.2 c 704
2010-04-09 09:43:24 C 14 24 20.91 -06 30 53.9 17.2 c 704
2010-04-11 00:15:02 C 14 22 57.58 -06 10 48.5 17.0 u 084
2010-04-12 11:48:10 C 14 21 35.062 -05 51 29.14 L F51
2010-04-12 12:01:02 C 14 21 34.515 -05 51 21.69 L F51
2010-04-14 23:44:47 C 14 19 03.65 -05 17 50.1 19.4 u 084
2010-04-15 07:17:08 C 14 18 43.85 -05 13 25.8 16.6 c 704
2010-04-15 07:33:20 C 14 18 43.07 -05 13 16.6 16.8 c 704
2010-04-15 07:49:34 C 14 18 42.32 -05 13 07.1 16.8 c 704
2010-04-15 08:05:52 C 14 18 41.52 -05 12 57.6 16.6 c 704
2010-04-15 08:22:02 C 14 18 40.75 -05 12 48.1 16.7 c 704
2010-04-15 23:12:02 C 14 18 00.37 -05 04 11.9 16.9 u C20
2010-04-15 23:16:16 C 14 18 00.17 -05 04 09.4 17.0 u C20
2010-04-16 17:51:31 C 14 17 09.24 -04 53 12.5 16.9 u C20
2010-04-16 17:55:44 C 14 17 09.04 -04 53 10.1 16.8 u C20
2010-04-18 22:06:00 C 14 14 36.64 -04 21 48.6 16.8 o 084
2010-04-19 22:28:48 C 14 13 22.05 -04 06 47.4 16.9 u C20
2010-04-19 22:33:02 C 14 13 21.82 -04 06 44.8 16.9 u C20
2010-04-20 22:17:46 C 14 12 07.44 -03 51 58.7 16.8 u C20
2010-04-22 00:55:56 C 14 10 41.45 -03 35 13.0 16.8 u C20
2010-04-22 01:00:10 C 14 10 41.22 -03 35 10.2 16.8 u C20
2010-04-24 01:51:05 C 14 07 59.49 -03 03 43.9 c 844
2010-04-24 02:14:57 C 14 07 58.05 -03 03 28.6 c 844
2010-04-24 02:18:42 C 14 07 57.83 -03 03 26.2 c 844