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
2021-08-28 05:55:01 C 15 34 09.19 -09 57 38.4 V T05
2021-08-30 05:59:15 C 15 43 09.71 -10 54 23.0 V T08
2021-08-30 06:03:54 C 15 43 10.55 -10 54 28.4 V T08
2021-08-30 06:12:31 C 15 43 12.18 -10 54 38.8 V T08
2021-08-30 06:31:09 C 15 43 15.66 -10 55 01.1 V T08
2021-09-01 06:09:52 C 15 52 46.68 -11 53 36.9 V T05
2021-09-01 06:15:10 C 15 52 47.74 -11 53 43.4 V T05
2021-09-01 06:25:45 C 15 52 49.85 -11 53 56.2 V T05
2021-09-01 06:41:01 C 15 52 52.91 -11 54 15.3 V T05
2021-09-03 05:47:41 C 16 02 55.39 -12 54 23.8 V T08
2021-09-03 05:56:58 C 16 02 57.37 -12 54 35.6 V T08
2021-09-03 06:04:57 C 16 02 59.07 -12 54 45.9 V T08
2021-09-03 06:21:34 C 16 03 02.60 -12 55 07.2 V T08
2021-09-05 09:23:05 C 16 14 41.03 -14 01 58.6 q E89
2021-09-05 09:27:57 C 16 14 42.15 -14 02 05.1 q E89
2021-09-05 09:33:14 C 16 14 43.38 -14 02 12.0 q E89
2021-09-05 09:38:30 C 16 14 44.62 -14 02 19.2 q E89
2021-09-07 06:09:09 C 16 25 36.76 -15 03 23.0 V T08
2021-09-07 06:13:48 C 16 25 37.90 -15 03 29.3 V T08
2021-09-07 06:22:26 C 16 25 40.01 -15 03 41.0 V T08
2021-09-07 06:38:22 C 16 25 43.91 -15 04 02.5 V T08
2021-09-08 05:26:00 C 16 31 34.83 -15 35 32.9 V T05
2021-09-08 05:30:38 C 16 31 36.00 -15 35 39.2 V T05
2021-09-08 05:41:51 C 16 31 38.82 -15 35 54.6 V T05
2021-09-08 05:58:21 C 16 31 42.98 -15 36 17.0 V T05
2021-09-26 06:36:49 C 18 59 57.42 -24 14 46.9 V T08
2021-09-26 06:50:05 C 19 00 02.69 -24 14 55.0 V T08
2021-09-26 06:55:24 C 19 00 04.79 -24 14 58.1 V T08
2021-09-26 07:06:41 C 19 00 09.27 -24 15 04.9 V T08
2021-09-26 07:10:00 C 19 00 10.59 -24 15 07.0 V T08
2021-09-28 06:18:18 C 19 19 29.32 -24 40 07.7 V T05
2021-09-28 06:22:54 C 19 19 31.15 -24 40 09.6 V T05
2021-09-28 06:48:07 C 19 19 41.22 -24 40 19.7 V T05
2021-09-30 07:05:05 C 19 39 28.15 -24 55 22.1 V T08
2021-09-30 07:10:26 C 19 39 30.27 -24 55 23.0 V T08
2021-09-30 07:20:23 C 19 39 34.23 -24 55 24.7 V T08
2021-09-30 07:41:37 C 19 39 42.69 -24 55 28.2 V T08
2021-10-02 06:52:37 C 19 58 50.20 -24 59 49.9 V T05
2021-10-02 06:57:16 C 19 58 52.02 -24 59 49.6 V T05
2021-10-02 07:06:34 C 19 58 55.65 -24 59 49.3 V T05
2021-10-02 07:22:26 C 19 59 01.85 -24 59 48.7 V T05
2021-10-03 11:11:42 C 20 10 07.96 -24 57 47.1 V D29
2021-10-03 11:33:20 C 20 10 16.25 -24 57 44.0 V D29
2021-10-03 11:54:58 C 20 10 24.58 -24 57 40.9 V D29
2021-10-04 07:29:25 C 20 18 04.59 -24 54 02.9 V T08
2021-10-04 07:34:03 C 20 18 06.36 -24 54 01.7 V T08
2021-10-04 07:44:41 C 20 18 10.38 -24 53 59.1 V T08
2021-10-04 08:03:57 C 20 18 17.70 -24 53 54.1 V T08
2021-10-06 01:48:53 S 20 34 19.296 -24 40 51.64 L C51
2021-10-06 04:57:01 S 20 35 30.103 -24 39 38.34 L C51