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
2007-03-08 10:40:22 C 11 47 20.01 +02 05 39.9 o 644
2007-03-08 11:09:57 C 11 47 18.59 +02 05 51.6 o 644
2007-03-08 11:39:22 C 11 47 17.13 +02 06 03.4 o 644
2007-03-11 05:06:12 C 11 44 06.66 +02 32 37.4 o 691
2007-03-11 05:31:31 C 11 44 05.38 +02 32 47.8 o 691
2007-03-11 05:56:51 C 11 44 04.07 +02 32 58.0 o 691
2007-03-14 07:34:51 C 11 40 21.64 +03 03 41.5 18.4 c 704
2007-03-14 07:50:18 C 11 40 20.75 +03 03 46.8 18.5 c 704
2007-03-14 08:05:46 C 11 40 20.02 +03 03 55.1 18.4 c 704
2007-03-14 08:21:14 C 11 40 19.26 +03 04 00.6 18.7 c 704
2007-03-14 08:37:58 C 11 40 18.30 +03 04 07.7 18.6 c 704
2007-03-15 00:27:20 C 11 39 29.73 +03 10 47.8 c 104
2007-03-15 00:46:50 C 11 39 28.69 +03 10 56.5 c 104
2007-03-15 01:05:05 C 11 39 27.75 +03 11 03.9 c 104
2007-03-15 04:32:00 C 11 39 17.47 +03 12 32.5 o 691
2007-03-15 04:57:23 C 11 39 16.13 +03 12 43.3 o 691
2007-03-15 05:22:46 C 11 39 14.79 +03 12 54.2 o 691
2007-03-15 06:30:42 C 11 39 11.21 +03 13 22.3 18.5 c 704
2007-03-15 06:46:28 C 11 39 10.35 +03 13 29.1 18.6 c 704
2007-03-15 07:18:05 C 11 39 08.68 +03 13 42.0 18.1 c 704
2007-03-15 07:34:20 C 11 39 07.86 +03 13 49.4 18.6 c 704
2007-03-17 06:01:26 C 11 36 43.74 +03 33 36.5 o 699
2007-03-17 06:32:58 C 11 36 42.13 +03 33 50.6 o 699
2007-03-17 07:04:32 C 11 36 40.42 +03 34 04.0 o 699
2007-03-17 07:36:04 C 11 36 38.70 +03 34 16.4 o 699
2007-03-17 07:43:26 C 11 36 38.28 +03 34 20.4 18.4 c 704
2007-03-17 07:59:00 C 11 36 37.40 +03 34 26.7 18.7 c 704
2007-03-17 08:14:42 C 11 36 36.62 +03 34 34.2 19.0 c 704
2007-03-17 08:30:32 C 11 36 35.75 +03 34 40.3 18.8 c 704
2007-03-17 08:46:20 C 11 36 34.94 +03 34 47.6 18.8 c 704
2007-03-20 08:07:19 C 11 32 51.02 +04 05 20.2 18.6 c 704
2007-03-20 08:23:10 C 11 32 50.21 +04 05 27.6 19.1 c 704
2007-03-20 08:38:34 C 11 32 49.36 +04 05 34.3 18.8 c 704
2007-03-20 08:54:29 C 11 32 48.51 +04 05 41.4 18.7 c 704
2007-03-21 06:42:23 C 11 31 40.12 +04 15 01.0 19.0 c 704
2007-03-21 06:57:16 C 11 31 39.26 +04 15 08.8 19.2 c 704
2007-03-21 07:12:21 C 11 31 38.54 +04 15 13.7 19.4 c 704
2007-03-21 07:42:43 C 11 31 36.87 +04 15 29.0 19.4 c 704
2007-04-04 06:29:54 C 11 14 45.04 +06 31 52.5 o 644
2007-04-04 06:59:26 C 11 14 43.63 +06 32 03.5 o 644
2007-04-04 07:28:43 C 11 14 42.22 +06 32 14.6 o 644
2007-04-07 05:19:28 C 11 11 33.28 +06 57 37.3 r 703
2007-04-07 05:28:49 C 11 11 32.82 +06 57 40.9 r 703
2007-04-07 05:38:06 C 11 11 32.38 +06 57 43.8 r 703
2007-04-07 05:47:25 C 11 11 31.95 +06 57 47.0 r 703
2007-04-16 06:17:46 C 11 03 05.94 +08 06 12.1 19.0 c 704
2007-04-16 06:31:11 C 11 03 05.50 +08 06 16.4 19.4 c 704
2007-04-16 06:44:43 C 11 03 04.99 +08 06 19.1 19.0 c 704
2007-04-16 06:57:54 C 11 03 04.56 +08 06 23.0 19.4 c 704
2007-04-16 07:11:03 C 11 03 04.10 +08 06 25.4 19.1 c 704