IAA RAS IAA Minor Planet Database

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
2021-05-22 19:29:04 C 13 35 30.21 +03 33 51.7 – V 089
2021-05-22 19:32:24 C 13 35 30.05 +03 33 53.4 – V 089
2021-05-22 19:35:44 C 13 35 29.85 +03 33 55.1 – V 089
2021-05-22 19:39:04 C 13 35 29.67 +03 33 56.6 – V 089
2021-05-22 19:42:24 C 13 35 29.48 +03 33 57.8 – V 089
2021-05-23 21:26:06 C 13 34 10.34 +03 45 32.8 – V 089
2021-05-23 21:32:46 C 13 34 10.00 +03 45 35.3 – V 089
2021-05-23 21:36:06 C 13 34 09.75 +03 45 37.2 – V 089
2021-05-23 21:39:26 C 13 34 09.60 +03 45 38.3 – V 089
2021-05-23 21:42:46 C 13 34 09.47 +03 45 40.4 – V 089
2021-05-24 19:02:48 C 13 33 06.61 +03 54 53.0 – V 089
2021-05-24 19:06:09 C 13 33 06.43 +03 54 54.6 – V 089
2021-05-24 19:09:29 C 13 33 06.27 +03 54 56.4 – V 089
2021-05-24 19:12:49 C 13 33 06.08 +03 54 57.6 – V 089
2021-05-24 19:16:09 C 13 33 05.92 +03 54 59.0 – V 089
2021-05-24 19:19:29 C 13 33 05.72 +03 55 00.6 – V 089
2021-05-24 19:22:49 C 13 33 05.56 +03 55 01.7 – V 089
2021-05-24 19:26:09 C 13 33 05.37 +03 55 03.4 – V 089
2021-05-24 19:29:29 C 13 33 05.21 +03 55 04.5 – V 089
2021-05-24 19:32:49 C 13 33 05.06 +03 55 06.1 – V 089
2021-05-25 20:15:48 C 13 31 54.18 +04 05 21.1 – V 130
2021-05-25 20:18:06 C 13 31 54.08 +04 05 22.0 – V 130
2021-05-25 20:20:47 C 13 31 53.94 +04 05 22.9 – V 130
2021-05-25 20:23:06 C 13 31 53.85 +04 05 24.1 – V 130
2021-05-25 21:00:18 C 13 31 51.69 +04 05 38.4 – V 089
2021-05-25 21:03:38 C 13 31 51.52 +04 05 39.8 – V 089
2021-05-25 21:16:58 C 13 31 50.85 +04 05 45.2 – V 089
2021-05-25 21:20:18 C 13 31 50.66 +04 05 47.1 – V 089
2021-05-25 21:23:38 C 13 31 50.54 +04 05 48.8 – V 089
2021-05-25 21:26:58 C 13 31 50.37 +04 05 49.2 – V 089
2021-05-26 10:09:47 C 13 31 14.70 +04 11 01.0 – V T08
2021-05-26 10:14:27 C 13 31 14.47 +04 11 02.8 – V T08
2021-05-26 10:24:24 C 13 31 13.98 +04 11 06.6 – V T08
2021-05-26 10:41:01 C 13 31 13.15 +04 11 13.0 – V T08
2021-05-26 18:50:49 C 13 30 51.60 +04 14 17.7 – V 089
2021-05-26 18:54:10 C 13 30 51.44 +04 14 18.9 – V 089
2021-05-26 18:57:30 C 13 30 51.24 +04 14 20.4 – V 089
2021-05-26 19:00:50 C 13 30 51.09 +04 14 21.6 – V 089
2021-05-26 19:04:10 C 13 30 50.94 +04 14 23.5 – V 089
2021-05-26 19:07:30 C 13 30 50.77 +04 14 24.2 – V 089
2021-05-26 19:10:50 C 13 30 50.63 +04 14 25.7 – V 089
2021-05-26 19:14:10 C 13 30 50.45 +04 14 27.1 – V 089
2021-05-26 19:17:30 C 13 30 50.32 +04 14 28.6 – V 089
2021-05-26 19:20:50 C 13 30 50.15 +04 14 29.3 – V 089
2021-05-27 18:57:06 C 13 29 47.24 +04 23 24.7 – V 089
2021-05-27 18:59:39 C 13 29 47.12 +04 23 25.6 – V 089
2021-05-27 19:02:12 C 13 29 47.00 +04 23 26.5 – V 089
2021-05-27 19:04:45 C 13 29 46.89 +04 23 27.4 – V 089
2021-05-27 19:07:18 C 13 29 46.78 +04 23 28.2 – V 089
2021-05-28 06:41:47 C 13 29 16.44 +04 27 44.3 – X U76