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
2011-01-07 21:53:07 C 01 44 35.40 +03 30 33.1 w J24
2011-01-07 22:00:55 C 01 44 35.99 +03 30 37.5 w J24
2011-01-08 01:40:59 C 01 44 53.20 +03 32 39.8 18.4 c 704
2011-01-08 02:00:19 C 01 44 54.62 +03 32 50.2 18.6 c 704
2011-01-08 02:19:29 C 01 44 56.07 +03 33 00.8 18.5 c 704
2011-01-08 02:39:26 C 01 44 57.56 +03 33 12.6 18.4 c 704
2011-01-08 02:58:44 C 01 44 59.07 +03 33 23.1 18.6 c 704
2011-01-27 03:20:13 C 02 19 42.96 +07 31 24.3 r 703
2011-01-27 03:27:39 C 02 19 43.50 +07 31 27.5 r 703
2011-01-27 03:35:08 C 02 19 44.07 +07 31 33.3 r 703
2011-01-27 03:42:37 C 02 19 44.50 +07 31 36.0 r 703
2011-01-30 02:15:24 C 02 25 03.76 +08 05 24.8 19.4 c 704
2011-01-30 02:33:59 C 02 25 05.05 +08 05 33.7 19.6 c 704
2011-01-30 02:52:31 C 02 25 06.45 +08 05 42.4 19.3 c 704
2011-01-30 03:11:01 C 02 25 07.79 +08 05 51.2 19.5 c 704
2011-01-30 03:29:38 C 02 25 09.22 +08 05 59.9 19.7 c 704
2011-02-08 02:48:42 C 02 41 21.84 +09 44 20.9 r G96
2011-02-08 02:55:53 C 02 41 22.34 +09 44 24.1 r G96
2011-02-08 03:03:10 C 02 41 22.92 +09 44 27.3 r G96
2011-02-08 03:10:18 C 02 41 23.42 +09 44 30.5 r G96
2011-03-29 02:53:58 C 04 10 22.15 +16 32 12.7 r G96
2011-03-29 03:03:41 C 04 10 22.87 +16 32 15.0 r G96
2011-03-29 03:13:19 C 04 10 23.62 +16 32 17.5 r G96
2011-03-29 03:22:59 C 04 10 24.34 +16 32 19.8 r G96
2011-11-03 11:22:14 C 09 44 04.21 +09 54 15.2 o 691
2011-11-03 11:40:31 C 09 44 04.79 +09 54 12.0 o 691
2011-11-03 11:58:48 C 09 44 05.37 +09 54 09.4 o 691
2012-01-19 08:01:35 C 09 43 18.93 +09 21 14.0 u H15
2012-01-19 08:23:32 C 09 43 17.98 +09 21 19.0 u H15
2012-01-19 08:45:35 C 09 43 17.20 +09 21 25.3 u H15
2012-01-19 09:07:42 C 09 43 16.32 +09 21 28.2 u H15
2012-01-20 07:34:40 C 09 42 23.80 +09 26 08.2 o 691
2012-01-20 08:00:29 C 09 42 22.78 +09 26 13.6 o 691
2012-02-03 12:53:12 C 09 27 19.680 +10 48 29.88 L F51
2012-02-03 13:11:46 C 09 27 18.777 +10 48 34.73 L F51
2012-02-03 13:32:37 C 09 27 17.763 +10 48 40.07 L F51
2012-02-04 12:13:48 C 09 26 12.980 +10 54 41.69 L F51
2012-02-04 12:31:31 C 09 26 12.120 +10 54 46.40 L F51
2012-02-04 14:08:00 C 09 26 07.412 +10 55 11.88 L F51
2012-02-04 14:23:36 C 09 26 06.649 +10 55 16.01 L F51
2012-02-22 10:11:37 C 09 05 50.548 +12 51 03.97 L F51
2012-02-22 10:35:51 C 09 05 49.444 +12 51 10.38 L F51
2012-02-22 11:00:04 C 09 05 48.328 +12 51 16.76 L F51
2012-02-24 21:36:44 C 09 03 14.53 +13 06 26.2 d B66
2012-02-24 22:37:30 C 09 03 11.90 +13 06 40.3 d B66
2012-03-25 04:35:18 C 08 42 43.70 +15 25 15.5 r G96
2012-03-25 04:45:19 C 08 42 43.59 +15 25 16.7 r G96
2012-03-25 04:55:16 C 08 42 43.45 +15 25 18.1 r G96
2012-03-25 05:05:14 C 08 42 43.30 +15 25 19.5 r G96
2012-05-22 03:36:44 C 09 04 04.90 +15 28 00.2 r G96