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
2024-12-04 11:47:49 C 05 51 23.522 +13 33 15.59 V T08
2024-12-06 09:17:07 C 05 48 21.878 +13 32 22.37 X F52
2024-12-06 09:33:43 C 05 48 20.734 +13 32 22.16 X F52
2024-12-06 09:50:38 C 05 48 19.569 +13 32 21.95 X F52
2024-12-06 10:07:26 C 05 48 18.411 +13 32 21.73 X F52
2024-12-08 09:14:19 C 05 45 09.158 +13 31 50.02 V T05
2024-12-08 09:18:24 C 05 45 08.880 +13 31 50.09 V T05
2024-12-08 09:22:24 C 05 45 08.590 +13 31 49.91 V T05
2024-12-08 09:29:49 C 05 45 08.052 +13 31 50.30 V T05
2024-12-10 08:03:53 C 05 42 01.150 +13 31 41.74 V T08
2024-12-10 08:07:12 C 05 42 00.893 +13 31 41.70 V T08
2024-12-10 08:23:30 C 05 41 59.782 +13 31 41.59 V T08
2024-12-10 08:27:32 C 05 41 59.486 +13 31 41.45 V T08
2024-12-10 09:22:30 C 05 41 55.750 +13 31 41.95 V T05
2024-12-10 10:13:23 C 05 41 52.226 +13 31 41.34 V T05
2024-12-10 10:15:59 C 05 41 52.044 +13 31 41.70 V T05
2024-12-10 10:20:33 C 05 41 51.701 +13 31 41.59 V T05
2024-12-17 10:48:33 C 05 30 49.867 +13 34 18.80 V T05
2024-12-17 10:53:14 C 05 30 49.582 +13 34 18.70 V T05
2024-12-17 11:02:42 C 05 30 48.962 +13 34 18.98 V T05
2024-12-17 11:25:26 C 05 30 47.470 +13 34 18.62 V T05
2024-12-18 11:20:21 C 05 29 16.958 +13 35 05.35 V T05
2024-12-18 11:24:55 C 05 29 16.654 +13 35 05.28 V T05
2024-12-18 11:44:36 C 05 29 15.384 +13 35 05.86 V T05
2024-12-18 12:10:29 C 05 29 13.716 +13 35 06.43 V T05
2024-12-18 12:23:05 C 05 29 12.888 +13 35 07.40 V T08
2024-12-18 12:37:43 C 05 29 11.971 +13 35 07.91 V T08
2024-12-18 12:49:01 C 05 29 11.249 +13 35 07.22 V T08
2024-12-18 12:53:42 C 05 29 10.937 +13 35 07.73 V T08
2024-12-19 04:46:59 C 05 28 11.738 +13 35 47.87 V W68
2024-12-19 04:51:34 C 05 28 11.482 +13 35 48.05 V W68
2024-12-19 05:02:47 C 05 28 10.723 +13 35 48.19 V W68
2024-12-19 05:19:08 C 05 28 09.706 +13 35 49.49 V W68
2024-12-20 09:42:03 C 05 26 24.760 +13 36 47.12 V V00
2024-12-20 09:50:08 C 05 26 24.256 +13 36 47.45 V V00
2024-12-20 09:58:12 C 05 26 23.752 +13 36 47.77 V V00
2024-12-20 10:06:16 C 05 26 23.248 +13 36 47.99 V V00
2024-12-20 10:23:30 C 05 26 22.459 +13 36 50.47 V T05
2024-12-20 10:28:04 C 05 26 22.150 +13 36 50.80 V T05
2024-12-20 10:38:32 C 05 26 21.482 +13 36 51.66 V T05
2024-12-20 10:51:28 C 05 26 20.659 +13 36 51.70 V T08
2024-12-20 10:52:57 C 05 26 20.618 +13 36 51.73 V T05
2024-12-20 10:55:33 C 05 26 20.455 +13 36 52.09 V T08
2024-12-20 11:03:29 C 05 26 19.944 +13 36 52.24 V T08
2024-12-20 11:20:36 C 05 26 18.847 +13 36 53.28 V T08
2024-12-20 20:51:12 C 05 25 44.503 +13 37 22.87 V M22
2024-12-20 21:04:56 C 05 25 43.656 +13 37 24.13 V M22
2024-12-20 21:07:35 C 05 25 43.469 +13 37 23.88 V M22
2024-12-20 21:44:22 C 05 25 41.203 +13 37 25.36 V M22
2024-12-21 09:51:45 C 05 24 57.024 +13 37 49.44 V V00