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
2024-09-13 14:58:10 C 06 00 42.838 +18 03 31.39 V T05
2024-09-13 15:00:48 C 06 00 42.967 +18 03 31.00 V T05
2024-09-13 15:08:22 C 06 00 43.418 +18 03 29.30 V T05
2024-09-15 14:31:43 C 06 03 36.826 +17 56 12.73 V T08
2024-09-15 14:37:02 C 06 03 37.121 +17 56 11.98 V T08
2024-09-15 14:45:02 C 06 03 37.591 +17 56 10.57 V T08
2024-09-15 15:06:34 C 06 03 38.839 +17 56 07.26 V T08
2024-10-01 14:08:13 C 06 22 08.957 +16 50 31.24 V T08
2024-10-01 14:10:53 C 06 22 09.017 +16 50 30.66 V T08
2024-10-01 14:18:52 C 06 22 09.307 +16 50 29.47 V T08
2024-10-01 14:34:17 C 06 22 09.859 +16 50 25.91 V T08
2024-10-10 13:42:28 C 06 28 23.249 +16 11 15.43 V T05
2024-10-10 13:46:24 C 06 28 23.522 +16 11 15.07 V T05
2024-10-10 13:51:37 C 06 28 23.474 +16 11 13.13 V T05
2024-10-10 13:59:27 C 06 28 23.630 +16 11 11.15 V T05
2024-10-15 13:01:06 C 06 30 24.984 +15 49 47.06 V T08
2024-10-15 13:05:45 C 06 30 25.063 +15 49 45.59 V T08
2024-10-15 13:09:45 C 06 30 25.078 +15 49 45.41 V T08
2024-10-15 13:18:23 C 06 30 25.183 +15 49 44.87 V T08
2024-10-24 13:25:34 C 06 31 20.347 +15 12 38.27 V T08
2024-10-24 13:28:14 C 06 31 20.297 +15 12 37.58 V T08
2024-10-24 13:32:21 C 06 31 20.246 +15 12 36.65 V T08
2024-10-24 14:06:08 C 06 31 19.987 +15 12 32.04 V T08
2024-10-26 01:45:23 C 06 31 07.745 +15 06 49.36 V M22
2024-10-26 01:57:16 C 06 31 07.673 +15 06 47.84 V M22
2024-10-26 02:24:01 C 06 31 07.416 +15 06 42.59 V M22
2024-10-26 02:36:22 C 06 31 07.226 +15 06 41.80 V M22
2024-11-03 12:27:24 C 06 27 59.374 +14 36 07.20 V T05
2024-11-03 12:30:00 C 06 27 59.282 +14 36 06.34 V T05
2024-11-03 12:34:33 C 06 27 59.148 +14 36 05.69 V T05
2024-11-03 12:42:09 C 06 27 58.994 +14 36 04.50 V T05
2024-11-04 11:20:58 C 06 27 25.476 +14 32 57.44 V T08
2024-11-04 11:24:18 C 06 27 25.404 +14 32 55.97 V T08
2024-11-04 11:47:17 C 06 27 24.782 +14 32 53.81 V T08
2024-11-04 11:51:17 C 06 27 24.691 +14 32 52.87 V T08
2024-11-11 11:55:13 C 06 21 58.332 +14 11 48.80 V T05
2024-11-11 11:57:49 C 06 21 58.212 +14 11 48.16 V T05
2024-11-11 12:04:08 C 06 21 57.967 +14 11 47.58 V T05
2024-11-11 12:11:24 C 06 21 57.662 +14 11 46.64 V T05
2024-11-12 11:39:14 C 06 21 01.807 +14 09 08.96 V T05
2024-11-12 11:41:51 C 06 21 01.663 +14 09 08.93 V T05
2024-11-12 11:47:03 C 06 21 01.469 +14 09 07.85 V T05
2024-11-12 11:55:31 C 06 21 01.104 +14 09 07.16 V T05
2024-11-21 07:10:25 C 06 10 54.283 +13 49 23.48 V W68
2024-11-21 07:14:37 C 06 10 54.014 +13 49 22.69 V W68
2024-11-21 07:54:59 C 06 10 51.730 +13 49 20.28 V W68
2024-11-21 08:25:30 C 06 10 50.014 +13 49 16.75 V W68
2024-11-22 10:52:57 C 06 09 22.079 +13 47 10.32 V G96
2024-11-22 10:57:08 C 06 09 22.217 +13 47 11.72 V T05
2024-11-22 10:59:46 C 06 09 22.051 +13 47 11.62 V T05