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
2021-10-06 06:24:10 C 20 36 02.94 -24 39 27.3 V T05
2021-10-06 06:28:47 C 20 36 04.62 -24 39 25.5 V T05
2021-10-06 06:38:41 C 20 36 08.22 -24 39 21.3 V T05
2021-10-06 06:53:52 C 20 36 13.75 -24 39 15.1 V T05
2021-10-06 08:05:20 S 20 36 40.783 -24 38 23.39 L C51
2021-10-06 11:12:44 S 20 37 50.90 -24 37 04.1 L C51
2021-10-06 12:46:48 S 20 38 26.03 -24 36 24.6 L C51
2021-10-06 14:21:36 S 20 39 01.39 -24 35 46.2 L C51
2021-10-06 15:55:40 S 20 39 36.41 -24 35 05.6 L C51
2021-10-06 17:29:55 S 20 40 11.45 -24 34 24.8 L C51
2021-10-06 17:29:59 C 20 40 11.78 -24 34 56.8 V 089
2021-10-06 17:40:05 C 20 40 15.42 -24 34 52.4 V 089
2021-10-06 17:50:15 C 20 40 19.17 -24 34 48.3 V 089
2021-10-06 18:00:11 C 20 40 22.78 -24 34 43.7 V 089
2021-10-06 18:10:03 C 20 40 26.36 -24 34 39.4 V 089
2021-10-06 18:20:01 C 20 40 29.97 -24 34 35.0 V 089
2021-10-06 18:30:00 C 20 40 33.60 -24 34 30.0 V 089
2021-10-06 18:40:00 C 20 40 37.25 -24 34 25.9 V 089
2021-10-06 19:03:59 S 20 40 46.38 -24 33 43.4 L C51
2021-10-06 20:38:03 S 20 41 21.235 -24 33 01.12 L C51
2021-10-06 22:12:07 S 20 41 56.054 -24 32 18.67 L C51
2021-10-07 02:06:33 C 20 43 23.42 -24 30 57.9 V 703
2021-10-07 02:15:58 C 20 43 26.82 -24 30 54.0 V 703
2021-10-07 02:25:24 C 20 43 30.21 -24 30 49.5 V 703
2021-10-07 02:34:49 C 20 43 33.59 -24 30 45.1 V 703
2021-10-07 04:27:50 S 20 44 14.575 -24 29 21.95 L C51
2021-10-10 02:33:46 C 21 09 04.79 -23 48 56.1 V 703
2021-10-10 02:41:58 C 21 09 07.54 -23 48 49.9 V 703
2021-10-10 02:52:09 C 21 09 10.85 -23 48 43.0 V 703
2021-10-10 03:00:20 C 21 09 13.53 -23 48 36.7 V 703
2021-10-19 08:14:23 C 22 14 16.27 -20 35 05.9 V T05
2021-10-19 08:22:20 C 22 14 18.20 -20 34 58.0 V T05
2021-10-19 08:35:35 C 22 14 21.41 -20 34 44.5 V T05
2021-10-19 08:46:08 C 22 14 23.95 -20 34 34.0 V T05
2021-10-21 08:02:16 C 22 25 47.59 -19 47 20.0 V T08
2021-10-21 08:06:55 C 22 25 48.64 -19 47 15.3 V T08
2021-10-21 08:16:53 C 22 25 50.88 -19 47 05.1 V T08
2021-10-21 08:34:09 C 22 25 54.77 -19 46 47.5 V T08
2021-10-21 22:24:44 C 22 29 07.09 -19 32 32.9 q Y00
2021-10-21 22:38:49 C 22 29 10.19 -19 32 18.8 q Y00
2021-10-21 22:52:43 C 22 29 13.23 -19 32 05.0 q Y00
2021-10-22 08:03:54 C 22 31 16.92 -19 23 06.2 V T05
2021-10-22 08:09:13 C 22 31 18.08 -19 23 00.9 V T05
2021-10-22 08:17:49 C 22 31 19.96 -19 22 52.1 V T05
2021-10-22 08:33:07 C 22 31 23.26 -19 22 36.4 V T05
2021-10-23 07:30:57 C 22 36 27.49 -18 59 23.0 V T05
2021-10-23 07:36:15 C 22 36 28.60 -18 59 17.6 V T05
2021-10-23 07:50:46 C 22 36 31.63 -18 59 02.8 V T05
2021-10-23 07:58:41 C 22 36 33.29 -18 58 54.7 V T05
2021-10-24 00:54:44 C 22 40 10.48 -18 41 28.3 q Y00