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
2021-06-18 19:01:19 C 13 19 00.47 +05 45 47.8 V C40
2021-06-18 19:35:17 C 13 19 00.53 +05 45 46.3 V C40
2021-06-18 19:36:58 C 13 19 00.53 +05 45 46.2 V C40
2021-06-20 18:57:29 C 13 19 19.50 +05 42 37.7 V C40
2021-06-20 19:44:30 C 13 19 19.77 +05 42 33.9 V C40
2021-06-20 20:17:51 C 13 19 19.98 +05 42 31.0 V C40
2021-06-21 07:55:25 C 13 19 26.66 +05 41 36.6 V T05
2021-06-21 08:00:04 C 13 19 26.68 +05 41 35.9 V T05
2021-06-21 08:49:32 C 13 19 27.03 +05 41 31.6 V T05
2021-06-21 08:56:59 C 13 19 27.08 +05 41 30.9 V T05
2021-06-23 07:08:57 C 13 20 01.38 +05 36 32.5 V T08
2021-06-23 07:13:37 C 13 20 01.43 +05 36 32.0 V T08
2021-06-23 07:21:34 C 13 20 01.50 +05 36 31.0 V T08
2021-06-23 07:38:12 C 13 20 01.67 +05 36 28.9 V T08
2021-06-23 21:20:00 C 13 20 13.97 +05 34 37.3 V L63
2021-06-23 21:32:49 C 13 20 14.13 +05 34 35.5 V L63
2021-06-23 21:43:43 C 13 20 14.28 +05 34 34.2 V L63
2021-06-26 03:34:37 C 13 21 12.58 +05 26 31.3 Z W33
2021-06-26 03:45:36 C 13 21 12.79 +05 26 29.3 Z W33
2021-06-26 03:56:35 C 13 21 13.00 +05 26 27.2 Z W33
2021-06-27 08:05:03 C 13 21 49.68 +05 21 34.1 V T08
2021-06-27 08:11:01 C 13 21 49.79 +05 21 33.0 V T08
2021-06-27 08:20:58 C 13 21 49.98 +05 21 31.1 V T08
2021-06-27 08:36:53 C 13 21 50.30 +05 21 28.1 V T08
2021-06-28 19:20:12 C 13 22 41.72 +05 14 32.0 V 089
2021-06-28 19:22:45 C 13 22 41.79 +05 14 31.8 V 089
2021-06-28 19:27:51 C 13 22 41.89 +05 14 30.5 V 089
2021-06-28 19:30:24 C 13 22 41.95 +05 14 30.2 V 089
2021-06-29 08:23:04 C 13 23 02.23 +05 11 54.1 V T05
2021-06-29 08:29:03 C 13 23 02.38 +05 11 52.8 V T05
2021-06-29 08:39:45 C 13 23 02.64 +05 11 50.5 V T05
2021-06-29 09:04:21 C 13 23 03.23 +05 11 45.0 V T05
2021-06-30 09:03:16 C 13 23 44.36 +05 06 42.6 q E89
2021-06-30 09:13:35 C 13 23 44.60 +05 06 40.2 q E89
2021-06-30 09:25:07 C 13 23 44.92 +05 06 37.6 q E89
2021-06-30 09:41:32 C 13 23 45.34 +05 06 34.1 q E89
2021-07-01 07:52:56 C 13 24 25.56 +05 01 01.5 V T08
2021-07-01 07:56:55 C 13 24 25.67 +05 01 00.6 V T08
2021-07-01 08:04:54 C 13 24 25.88 +05 00 58.4 V T08
2021-07-01 08:22:50 C 13 24 26.39 +05 00 54.0 V T08
2021-07-05 07:05:40 C 13 27 47.41 +04 35 11.6 V T08
2021-07-05 07:15:37 C 13 27 47.74 +04 35 08.6 V T08
2021-07-05 07:36:13 C 13 27 48.47 +04 35 02.3 V T08
2021-07-05 20:25:03 C 13 28 19.33 +04 31 02.7 V B38
2021-07-05 20:25:48 C 13 28 19.36 +04 31 02.7 V B38
2021-07-05 20:30:23 C 13 28 19.53 +04 31 01.3 V B38
2021-07-05 20:39:52 C 13 28 19.88 +04 30 58.2 V B38
2021-07-07 07:23:27 C 13 29 47.16 +04 20 05.3 V T05
2021-07-07 07:28:45 C 13 29 47.37 +04 20 03.4 V T05
2021-07-07 07:36:40 C 13 29 47.68 +04 20 00.7 V T05