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
2004-02-17 09:15:50 C 10 28 51.00 +07 14 55.1 t 608
2004-02-17 09:30:27 C 10 28 50.23 +07 15 00.1 t 608
2004-02-17 09:45:58 C 10 28 49.52 +07 15 04.7 t 608
2004-02-26 06:40:30 C 10 18 38.40 +08 25 18.7 18.8 c 704
2004-02-26 06:56:38 C 10 18 37.59 +08 25 24.8 19.4 c 704
2004-02-26 07:12:47 C 10 18 36.81 +08 25 30.0 19.3 c 704
2004-02-26 07:28:51 C 10 18 36.03 +08 25 34.8 19.5 c 704
2004-02-26 07:44:55 C 10 18 35.22 +08 25 40.1 19.7 c 704
2004-03-11 03:40:08 C 10 02 58.91 +10 14 18.4 19.4 c 644
2004-03-11 04:10:57 C 10 02 57.56 +10 14 27.9 19.3 c 644
2004-03-11 04:43:26 C 10 02 56.09 +10 14 38.2 19.1 c 644
2004-03-17 03:19:46 C 09 56 57.66 +10 57 01.3 c 691
2004-03-17 03:59:58 C 09 56 56.01 +10 57 12.8 c 691
2004-03-17 04:42:01 C 09 56 54.29 +10 57 24.7 c 691
2004-03-18 03:26:58 C 09 56 01.03 +11 03 47.9 c 691
2004-03-18 04:11:02 C 09 55 59.28 +11 04 00.3 c 691
2004-03-18 04:54:01 C 09 55 57.57 +11 04 12.3 c 691
2004-03-18 06:45:50 C 09 55 53.15 +11 04 43.3 19.7 c 704
2004-03-18 07:02:09 C 09 55 52.50 +11 04 47.3 20.0 c 704
2004-03-18 07:19:11 C 09 55 51.81 +11 04 53.0 19.9 c 704
2004-03-18 07:35:39 C 09 55 51.33 +11 04 58.2 20.3 c 704
2004-03-18 07:52:25 C 09 55 50.49 +11 05 01.7 19.4 c 704
2004-03-23 04:05:02 C 09 51 38.46 +11 35 42.7 19.5 c 704
2004-03-23 04:20:27 C 09 51 37.88 +11 35 46.6 19.8 c 704
2004-03-23 04:36:06 C 09 51 37.39 +11 35 50.4 20.5 c 704
2004-03-23 04:51:16 C 09 51 36.78 +11 35 54.1 19.8 c 704
2004-03-23 05:06:28 C 09 51 36.30 +11 35 57.7 19.8 c 704
2004-03-27 03:18:04 C 09 48 37.73 +11 58 21.4 c 691
2004-03-27 03:57:16 C 09 48 36.53 +11 58 30.3 c 691
2004-03-27 04:48:19 C 09 48 34.96 +11 58 41.7 c 691
2004-06-16 06:23:56 C 10 15 10.47 +11 22 43.8 t 568
2004-06-16 06:31:20 C 10 15 10.86 +11 22 41.9 t 568
2004-06-16 06:38:42 C 10 15 11.17 +11 22 40.5 t 568
2005-12-30 08:26:58 C 07 19 27.27 +14 34 24.6 19.8 c 704
2005-12-30 08:46:27 C 07 19 26.20 +14 34 26.2 19.7 c 704
2005-12-30 09:06:08 C 07 19 25.05 +14 34 28.6 19.4 c 704
2007-02-24 08:27:23 C 11 59 37.96 +00 20 43.1 19.2 c 704
2007-02-24 08:44:24 C 11 59 37.38 +00 20 47.3 19.4 c 704
2007-02-24 09:01:27 C 11 59 36.63 +00 20 53.8 19.5 c 704
2007-02-24 09:18:39 C 11 59 36.08 +00 20 57.2 19.8 c 704
2007-02-24 09:35:42 C 11 59 35.51 +00 21 03.4 19.4 c 704
2007-02-25 07:45:54 C 11 58 46.54 +00 28 09.6 o 704
2007-02-25 08:02:36 C 11 58 45.94 +00 28 15.7 o 704
2007-02-25 08:19:12 C 11 58 45.25 +00 28 20.1 o 704
2007-02-25 08:26:13 C 11 58 45.01 +00 28 23.3 r G96
2007-02-25 08:35:47 C 11 58 44.64 +00 28 25.6 o 704
2007-02-25 08:37:44 C 11 58 44.58 +00 28 26.9 r G96
2007-02-25 08:49:17 C 11 58 44.14 +00 28 30.6 r G96
2007-02-25 08:52:23 C 11 58 43.99 +00 28 32.5 o 704
2007-02-25 09:00:48 C 11 58 43.71 +00 28 34.5 r G96