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
2021-04-18 16:49:01 C 14 23 32.39 -04 51 04.4 o C94
2021-04-18 17:05:08 C 14 23 31.57 -04 50 54.8 o C94
2021-04-18 17:21:19 C 14 23 30.85 -04 50 45.8 o C94
2021-04-18 17:46:16 C 14 23 29.280 -04 50 18.06 V P07
2021-04-18 20:07:09 C 14 23 22.258 -04 48 52.13 V P07
2021-04-19 08:52:17 C 14 22 46.36 -04 41 15.4 V 703
2021-04-19 08:59:52 C 14 22 45.98 -04 41 10.7 V 703
2021-04-19 09:07:27 C 14 22 45.59 -04 41 06.3 V 703
2021-04-19 09:15:01 C 14 22 45.20 -04 41 01.4 V 703
2021-04-20 11:08:55 C 14 21 29.86 -04 24 57.8 V T08
2021-04-20 11:12:56 C 14 21 29.65 -04 24 55.3 V T08
2021-04-20 12:03:57 C 14 21 26.95 -04 24 23.3 V T08
2021-04-20 12:14:34 C 14 21 26.39 -04 24 16.8 V T08
2021-04-20 20:56:34 C 14 21 01.13 -04 18 54.7 V 108
2021-04-20 21:01:57 C 14 21 00.85 -04 18 51.6 V 108
2021-04-20 21:08:24 C 14 21 00.47 -04 18 47.5 V 108
2021-04-20 21:12:42 C 14 21 00.27 -04 18 44.8 V 108
2021-04-22 07:42:40 C 14 19 14.26 -03 56 54.5 V 703
2021-04-22 07:50:35 C 14 19 13.81 -03 56 49.7 V 703
2021-04-22 07:58:31 C 14 19 13.36 -03 56 44.5 V 703
2021-04-22 08:06:27 C 14 19 12.93 -03 56 39.6 V 703
2021-04-22 10:10:22 C 14 19 06.68 -03 55 18.0 V T05
2021-04-22 10:13:00 C 14 19 06.54 -03 55 16.3 V T05
2021-04-22 10:18:18 C 14 19 06.24 -03 55 13.0 V T05
2021-04-22 10:25:37 C 14 19 05.82 -03 55 08.3 V T05
2021-04-23 12:48:06 C 14 17 42.744 -03 38 02.65 V P07
2021-04-23 14:02:44 C 14 17 38.544 -03 37 14.56 V P07
2021-04-23 14:59:37 C 14 17 35.314 -03 36 38.05 V P07
2021-04-23 15:00:14 C 14 17 35.278 -03 36 37.84 V P07
2021-04-23 15:53:08 C 14 17 32.249 -03 36 03.46 V P07
2021-04-23 15:53:45 C 14 17 32.227 -03 36 03.13 V P07
2021-04-23 16:56:28 C 14 17 28.610 -03 35 22.52 V P07
2021-04-23 17:58:00 C 14 17 25.087 -03 34 42.74 V P07
2021-04-23 19:15:55 C 14 17 20.638 -03 33 52.49 V P07
2021-04-23 20:57:40 C 14 17 16.03 -03 33 01.5 V K74
2021-04-23 21:01:54 C 14 17 15.78 -03 32 58.7 V K74
2021-04-23 21:06:08 C 14 17 15.56 -03 32 56.2 V K74
2021-04-23 21:10:22 C 14 17 15.32 -03 32 53.2 V K74
2021-04-23 21:14:34 C 14 17 15.10 -03 32 50.6 V K74
2021-04-23 21:42:57 C 14 17 13.51 -03 32 31.4 V G17
2021-04-23 21:54:08 C 14 17 12.87 -03 32 23.9 V G17
2021-04-23 22:05:20 C 14 17 12.24 -03 32 16.8 V G17
2021-04-24 08:38:44 C 14 16 37.96 -03 25 21.3 V T08
2021-04-24 08:43:24 C 14 16 37.69 -03 25 18.1 V T08
2021-04-24 08:51:24 C 14 16 37.22 -03 25 13.0 V T08
2021-04-24 09:06:01 C 14 16 36.37 -03 25 03.4 V T08
2021-04-24 12:38:58 C 14 16 25.121 -03 22 36.16 V P07
2021-04-24 14:20:36 C 14 16 19.270 -03 21 29.09 V P07
2021-04-24 15:05:15 C 14 16 16.656 -03 20 59.89 V P07
2021-04-24 15:59:36 C 14 16 13.486 -03 20 24.61 V P07