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
2007-05-21 04:26:09 C 10 55 17.58 +09 36 04.0 r 703
2007-05-21 04:39:19 C 10 55 17.86 +09 36 02.5 r 703
2007-05-21 04:52:29 C 10 55 17.94 +09 36 00.9 r 703
2007-05-21 05:05:40 C 10 55 18.22 +09 36 01.0 r 703
2008-12-22 08:57:58 C 08 54 00.46 +11 36 36.7 r 703
2008-12-22 09:07:39 C 08 54 00.25 +11 36 38.1 r 703
2008-12-22 09:17:23 C 08 53 59.92 +11 36 39.6 r 703
2008-12-22 09:27:07 C 08 53 59.67 +11 36 40.3 r 703
2009-01-01 09:39:37 C 08 45 30.34 +12 05 12.4 o 691
2009-01-01 10:05:44 C 08 45 29.24 +12 05 16.1 o 691
2009-01-01 10:32:13 C 08 45 28.16 +12 05 19.9 o 691
2009-01-18 08:16:54 C 08 26 39.01 +13 18 17.7 r G96
2009-01-18 08:24:27 C 08 26 38.65 +13 18 19.0 r G96
2009-01-18 08:31:58 C 08 26 38.25 +13 18 20.7 r G96
2009-01-18 08:39:34 C 08 26 37.86 +13 18 22.3 r G96
2009-01-21 06:34:02 C 08 23 05.19 +13 32 58.9 19.6 c 704
2009-01-21 06:52:12 C 08 23 04.23 +13 33 04.6 20.0 c 704
2009-01-21 07:10:22 C 08 23 03.32 +13 33 08.7 20.1 c 704
2009-01-21 07:28:48 C 08 23 02.28 +13 33 13.3 20.3 c 704
2009-01-21 07:47:10 C 08 23 01.33 +13 33 15.9 20.0 c 704
2009-01-28 03:40:15 C 08 14 42.18 +14 08 28.2 r 703
2009-01-28 03:47:15 C 08 14 41.71 +14 08 28.6 r 703
2009-01-28 03:54:18 C 08 14 41.35 +14 08 30.8 r 703
2009-01-28 04:01:22 C 08 14 40.99 +14 08 32.5 r 703
2009-02-03 05:28:58 C 08 07 32.37 +14 39 56.9 r G96
2009-02-03 05:35:58 C 08 07 32.05 +14 39 58.5 r G96
2009-02-03 05:43:01 C 08 07 31.58 +14 39 59.9 r G96
2009-02-03 05:50:02 C 08 07 31.33 +14 40 01.4 r G96
2010-01-19 23:46:37 S 13 48 57.317 -09 39 45.68 L C51
2010-01-20 10:53:43 S 13 49 30.569 -09 41 50.71 L C51
2010-01-20 17:14:45 S 13 49 49.416 -09 43 00.59 L C51
2010-01-20 20:25:16 S 13 49 58.968 -09 43 37.27 L C51
2010-01-20 23:35:58 S 13 50 08.429 -09 44 12.44 L C51
2010-01-21 02:46:29 S 13 50 17.839 -09 44 47.98 L C51
2010-02-13 12:37:17 C 14 15 05.79 -10 53 46.8 r 703
2010-02-13 12:45:18 C 14 15 06.01 -10 53 49.5 r 703
2010-02-13 12:53:23 C 14 15 06.37 -10 53 47.9 r 703
2010-02-13 13:01:25 C 14 15 06.58 -10 53 49.4 r 703
2010-03-13 02:15:58 C 14 31 46.37 -10 17 02.1 r 106
2010-03-13 02:33:45 C 14 31 46.54 -10 16 58.9 r 106
2010-03-13 02:51:30 C 14 31 46.69 -10 16 55.8 r 106
2010-03-13 03:09:16 C 14 31 46.91 -10 16 52.5 r 106
2010-03-16 10:47:09 C 14 32 23.13 -10 00 45.7 r G96
2010-03-16 10:56:39 C 14 32 23.17 -10 00 44.0 r G96
2010-03-16 11:06:18 C 14 32 23.20 -10 00 41.8 r G96
2010-03-16 11:15:44 C 14 32 23.24 -10 00 39.7 r G96
2010-03-18 09:07:36 C 14 32 33.94 -09 50 02.9 18.5 c 704
2010-03-18 09:23:42 C 14 32 33.92 -09 49 56.5 19.6 c 704
2010-03-18 09:39:51 C 14 32 34.02 -09 49 52.8 19.2 c 704
2010-03-18 09:56:01 C 14 32 33.99 -09 49 49.6 19.4 c 704