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
2023-03-16 06:09:25 C 08 49 14.900 +14 43 53.55 U F51
2023-03-16 06:23:16 C 08 49 14.545 +14 43 56.05 U F51
2023-03-16 06:36:50 C 08 49 14.191 +14 43 58.41 U F51
2023-03-26 03:48:52 C 08 44 40.499 +15 20 56.15 V G96
2023-03-26 03:57:04 C 08 44 40.391 +15 20 57.08 V G96
2023-03-26 04:05:15 C 08 44 40.243 +15 20 57.95 V G96
2023-03-26 04:13:28 C 08 44 40.146 +15 20 59.24 V G96
2023-04-07 12:56:03 C 08 42 45.70 +15 51 04.2 V D29
2023-04-07 13:11:05 C 08 42 45.71 +15 51 05.7 V D29
2024-03-29 14:35:34 C 20 18 46.070 -14 10 49.12 V T08
2024-03-29 14:41:33 C 20 18 47.194 -14 10 45.30 V T08
2024-03-29 14:55:48 C 20 18 49.810 -14 10 36.01 V T08
2024-03-29 15:16:43 C 20 18 53.789 -14 10 21.22 V T08
2024-03-31 02:39:15 C 20 25 31.207 -13 46 49.80 V M22
2024-03-31 02:44:40 C 20 25 32.155 -13 46 46.06 V M22
2024-03-31 02:53:25 C 20 25 33.852 -13 46 39.68 V M22
2024-03-31 03:14:39 C 20 25 37.812 -13 46 25.39 V M22
2024-04-23 09:38:14 C 22 12 12.043 -05 56 50.39 V W68
2024-04-23 09:44:08 C 22 12 13.150 -05 56 44.20 V W68
2024-04-23 09:56:48 C 22 12 15.528 -05 56 32.35 V W68
2024-04-23 10:07:56 C 22 12 17.647 -05 56 21.88 V W68
2024-05-19 03:45:22 C 00 06 50.388 +04 05 51.79 V M22
2024-05-19 03:52:01 C 00 06 51.533 +04 05 57.23 V M22
2024-05-19 04:00:03 C 00 06 52.958 +04 06 05.33 V M22
2024-05-19 04:12:20 C 00 06 55.121 +04 06 17.06 V M22
2024-06-08 14:12:30 C 01 30 22.793 +10 49 18.37 V T05
2024-06-08 14:26:10 C 01 30 24.989 +10 49 27.88 V T05
2024-06-08 14:30:05 C 01 30 25.625 +10 49 31.08 V T05
2024-06-08 14:43:54 C 01 30 27.890 +10 49 40.40 V T05
2024-08-09 14:35:16 C 04 50 19.253 +19 08 01.50 V T08
2024-08-09 14:39:57 C 04 50 19.778 +19 08 01.54 V T08
2024-08-09 14:50:59 C 04 50 20.899 +19 08 02.36 V T08
2024-08-09 15:01:13 C 04 50 21.922 +19 08 02.47 V T08
2024-08-10 14:35:47 C 04 52 47.890 +19 08 31.56 V T08
2024-08-10 14:40:26 C 04 52 48.348 +19 08 31.63 V T08
2024-08-10 14:52:14 C 04 52 49.546 +19 08 32.06 V T08
2024-08-10 15:01:58 C 04 52 50.534 +19 08 32.57 V T08
2024-08-15 14:31:27 C 05 04 46.714 +19 08 28.79 V T05
2024-08-15 14:43:55 C 05 04 47.894 +19 08 28.43 V T05
2024-08-15 14:59:52 C 05 04 49.409 +19 08 28.68 V T05
2024-08-15 15:09:11 C 05 04 50.270 +19 08 27.78 V T05
2024-09-09 14:26:05 C 05 54 26.736 +18 17 32.35 V T05
2024-09-09 14:31:28 C 05 54 27.089 +18 17 31.52 V T05
2024-09-09 14:56:17 C 05 54 28.718 +18 17 28.64 V T05
2024-09-09 15:14:26 C 05 54 29.962 +18 17 25.87 V T05
2024-09-12 14:47:37 C 05 59 11.458 +18 07 09.01 V T05
2024-09-12 14:53:30 C 05 59 11.868 +18 07 07.39 V T05
2024-09-12 15:03:58 C 05 59 12.545 +18 07 06.13 V T05
2024-09-12 15:11:36 C 05 59 12.982 +18 07 05.12 V T05
2024-09-13 14:49:37 C 06 00 42.281 +18 03 33.12 V T05