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
2021-11-01 04:06:49 C 23 16 14.33 -15 27 37.6 V G96
2021-11-01 04:13:46 C 23 16 15.41 -15 27 30.9 V G96
2021-11-01 04:29:06 C 23 16 17.80 -15 27 16.0 V 703
2021-11-01 04:36:51 C 23 16 19.03 -15 27 08.9 V 703
2021-11-01 04:44:35 C 23 16 20.21 -15 27 01.0 V 703
2021-11-01 04:52:20 C 23 16 21.43 -15 26 53.6 V 703
2021-11-01 07:25:28 C 23 16 46.22 -15 24 21.9 V T08
2021-11-01 07:30:07 C 23 16 46.93 -15 24 17.4 V T08
2021-11-01 07:38:04 C 23 16 48.17 -15 24 09.7 V T08
2021-11-01 07:54:00 C 23 16 50.63 -15 23 54.2 V T08
2021-11-02 08:05:45 C 23 20 40.42 -15 00 38.8 V T08
2021-11-02 08:13:45 C 23 20 41.62 -15 00 31.2 V T08
2021-11-02 08:23:04 C 23 20 43.01 -15 00 22.2 V T08
2021-11-02 08:43:02 C 23 20 46.01 -15 00 03.1 V T08
2021-11-04 00:56:05 C 23 26 53.16 -14 21 40.2 q Y00
2021-11-04 01:01:59 C 23 26 54.00 -14 21 34.8 q Y00
2021-11-04 01:06:44 C 23 26 54.71 -14 21 29.3 q Y00
2021-11-04 04:19:51 C 23 27 23.70 -14 18 46.4 V 703
2021-11-04 04:28:07 C 23 27 24.88 -14 18 38.3 V 703
2021-11-04 04:36:24 C 23 27 26.06 -14 18 30.3 V 703
2021-11-04 04:44:40 C 23 27 27.23 -14 18 22.7 V 703
2021-11-04 08:13:43 C 23 27 57.89 -14 15 03.0 V T05
2021-11-04 08:19:03 C 23 27 58.63 -14 14 57.9 V T05
2021-11-04 08:27:00 C 23 27 59.77 -14 14 50.4 V T05
2021-11-04 08:45:00 C 23 28 02.33 -14 14 33.5 V T05
2021-11-05 07:45:21 C 23 31 22.99 -13 53 04.6 V T08
2021-11-05 07:49:59 C 23 31 23.63 -13 53 00.3 V T08
2021-11-05 07:58:40 C 23 31 24.82 -13 52 52.3 V T08
2021-11-05 08:13:56 C 23 31 26.93 -13 52 37.8 V T08
2021-11-06 05:09:16 C 23 34 25.547 -13 33 17.14 U F52
2021-11-06 05:10:11 C 23 34 25.651 -13 33 15.61 U F52
2021-11-06 05:27:32 C 23 34 28.014 -13 33 00.48 U F52
2021-11-06 05:43:55 C 23 34 30.220 -13 32 45.49 U F52
2021-11-06 05:44:50 C 23 34 30.343 -13 32 44.60 U F52
2021-11-06 06:01:14 C 23 34 32.545 -13 32 29.65 U F52
2021-11-06 06:02:10 C 23 34 32.663 -13 32 28.67 U F52
2021-11-06 06:59:21 C 23 34 40.33 -13 31 35.9 V T08
2021-11-06 07:07:20 C 23 34 41.39 -13 31 28.7 V T08
2021-11-06 07:15:57 C 23 34 42.55 -13 31 20.6 V T08
2021-11-06 07:30:35 C 23 34 44.51 -13 31 07.2 V T08
2021-11-07 00:32:49 C 23 37 05.67 -13 15 16.5 q Y00
2021-11-07 00:37:21 C 23 37 06.22 -13 15 12.8 q Y00
2021-11-07 00:42:06 C 23 37 06.78 -13 15 09.0 q Y00
2021-11-07 23:53:55 C 23 40 15.87 -12 54 20.9 Z W33
2021-11-08 00:45:45 C 23 40 22.57 -12 53 34.2 Z W33
2021-11-08 01:35:04 C 23 40 28.93 -12 52 50.1 Z W33
2021-11-08 04:53:10 C 23 40 54.89 -12 49 50.6 V 703
2021-11-08 05:00:28 C 23 40 55.84 -12 49 44.0 V 703
2021-11-08 05:07:47 C 23 40 56.76 -12 49 37.5 V 703
2021-11-08 05:15:06 C 23 40 57.71 -12 49 30.8 V 703