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
2021-07-31 07:24:58 C 14 08 08.99 -00 16 02.4 V T05
2021-08-02 06:40:38 C 14 12 30.06 -00 46 33.2 V T08
2021-08-02 06:45:18 C 14 12 30.48 -00 46 36.2 V T08
2021-08-02 06:54:35 C 14 12 31.31 -00 46 42.3 V T08
2021-08-02 07:11:51 C 14 12 32.86 -00 46 53.7 V T08
2021-08-04 06:15:04 C 14 17 05.08 -01 18 37.1 V T05
2021-08-04 06:19:42 C 14 17 05.52 -01 18 40.3 V T05
2021-08-04 06:28:18 C 14 17 06.32 -01 18 46.1 V T05
2021-08-04 06:44:51 C 14 17 07.87 -01 18 57.5 V T05
2021-08-04 12:31:53 C 14 17 42.24 -01 23 01.2 q D29
2021-08-04 12:52:15 C 14 17 44.18 -01 23 15.1 q D29
2021-08-04 13:12:37 C 14 17 46.13 -01 23 29.2 q D29
2021-08-06 06:16:16 C 14 21 55.52 -01 52 23.2 V T08
2021-08-06 06:20:15 C 14 21 55.92 -01 52 25.9 V T08
2021-08-06 06:28:13 C 14 21 56.70 -01 52 31.5 V T08
2021-08-06 06:42:51 C 14 21 58.14 -01 52 41.9 V T08
2021-08-08 06:01:11 C 14 26 58.09 -02 27 26.4 V T05
2021-08-08 06:06:29 C 14 26 58.64 -02 27 30.5 V T05
2021-08-08 06:14:26 C 14 26 59.46 -02 27 36.4 V T05
2021-08-08 06:32:16 C 14 27 01.31 -02 27 49.7 V T05
2021-08-10 05:48:15 C 14 32 15.23 -03 04 02.8 V T08
2021-08-10 05:52:54 C 14 32 15.72 -03 04 06.2 V T08
2021-08-10 06:04:11 C 14 32 16.95 -03 04 15.1 V T08
2021-08-10 06:24:46 C 14 32 19.18 -03 04 31.2 V T08
2021-08-10 07:11:17 C 14 32 24.89 -03 04 44.8 q E89
2021-08-10 07:18:00 C 14 32 25.66 -03 04 49.8 q E89
2021-08-10 07:23:51 C 14 32 26.27 -03 04 54.7 q E89
2021-08-10 07:29:40 C 14 32 26.85 -03 04 59.2 q E89
2021-08-12 05:51:37 C 14 37 49.49 -03 42 28.9 V T05
2021-08-12 05:56:14 C 14 37 50.02 -03 42 32.7 V T05
2021-08-12 06:06:48 C 14 37 51.22 -03 42 41.3 V T05
2021-08-12 06:23:19 C 14 37 53.09 -03 42 54.8 V T05
2021-08-16 06:16:44 C 14 49 50.58 -05 04 46.5 V T05
2021-08-16 06:24:40 C 14 49 51.60 -05 04 53.3 V T05
2021-08-16 06:29:17 C 14 49 52.17 -05 04 57.6 V T05
2021-08-16 06:47:10 C 14 49 54.42 -05 05 13.4 V T05
2021-08-20 05:44:20 C 15 02 59.56 -06 33 37.0 V T05
2021-08-20 05:48:57 C 15 03 00.19 -06 33 41.5 V T05
2021-08-20 05:56:53 C 15 03 01.31 -06 33 49.1 V T05
2021-08-20 06:13:24 C 15 03 03.61 -06 34 05.2 V T05
2021-08-22 06:30:53 C 15 10 14.95 -07 22 03.5 V T08
2021-08-22 06:36:13 C 15 10 15.75 -07 22 08.8 V T08
2021-08-22 06:44:50 C 15 10 17.01 -07 22 17.3 V T08
2021-08-22 07:00:06 C 15 10 19.28 -07 22 32.8 V T08
2021-08-26 05:41:35 C 15 25 39.07 -09 03 03.3 V T08
2021-08-26 05:46:13 C 15 25 39.83 -09 03 08.4 V T08
2021-08-26 05:54:12 C 15 25 41.14 -09 03 17.2 V T08
2021-08-26 06:13:29 C 15 25 44.32 -09 03 38.3 V T08
2021-08-28 05:42:29 C 15 34 06.99 -09 57 24.0 V T05
2021-08-28 05:47:05 C 15 34 07.80 -09 57 29.3 V T05