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
2021-06-09 19:02:15 C 13 20 17.36 +05 39 01.8 – V C40
2021-06-09 19:17:54 C 13 20 17.04 +05 39 03.7 – V C40
2021-06-09 19:19:37 C 13 20 17.01 +05 39 03.9 – V C40
2021-06-09 19:24:50 C 13 20 16.91 +05 39 04.3 – V C40
2021-06-09 19:31:48 C 13 20 16.77 +05 39 05.3 – V C40
2021-06-09 19:37:00 C 13 20 16.68 +05 39 05.8 – V C40
2021-06-09 19:38:46 C 13 20 16.65 +05 39 06.0 – V C40
2021-06-09 19:40:29 C 13 20 16.61 +05 39 06.1 – V C40
2021-06-09 19:42:14 C 13 20 16.58 +05 39 06.5 – V C40
2021-06-09 19:44:50 C 13 20 16.53 +05 39 06.7 – V C40
2021-06-09 19:46:36 C 13 20 16.49 +05 39 06.8 – V C40
2021-06-09 19:50:04 C 13 20 16.43 +05 39 07.1 – V C40
2021-06-09 19:57:01 C 13 20 16.29 +05 39 08.0 – V C40
2021-06-09 19:58:46 C 13 20 16.27 +05 39 08.1 – V C40
2021-06-09 20:12:40 C 13 20 16.01 +05 39 09.7 – V C40
2021-06-09 20:28:07 C 13 20 15.72 +05 39 11.5 – V C40
2021-06-10 19:15:17 C 13 19 55.36 +05 41 35.2 – V C40
2021-06-10 19:18:46 C 13 19 55.30 +05 41 35.5 – V C40
2021-06-10 19:23:58 C 13 19 55.21 +05 41 35.9 – V C40
2021-06-10 19:30:56 C 13 19 55.09 +05 41 36.6 – V C40
2021-06-10 19:34:25 C 13 19 55.03 +05 41 36.9 – V C40
2021-06-10 19:36:08 C 13 19 55.00 +05 41 37.0 – V C40
2021-06-10 19:37:52 C 13 19 54.97 +05 41 37.1 – V C40
2021-06-10 19:39:38 C 13 19 54.93 +05 41 37.4 – V C40
2021-06-10 19:41:21 C 13 19 54.91 +05 41 37.7 – V C40
2021-06-10 19:46:35 C 13 19 54.82 +05 41 38.0 – V C40
2021-06-10 19:48:19 C 13 19 54.80 +05 41 38.3 – V C40
2021-06-10 19:55:19 C 13 19 54.67 +05 41 38.8 – V C40
2021-06-10 19:57:05 C 13 19 54.64 +05 41 39.1 – V C40
2021-06-10 20:04:01 C 13 19 54.53 +05 41 39.7 – V C40
2021-06-10 20:07:30 C 13 19 54.47 +05 41 40.1 – V C40
2021-06-10 20:09:15 C 13 19 54.43 +05 41 40.2 – V C40
2021-06-10 20:10:58 C 13 19 54.40 +05 41 40.5 – V C40
2021-06-10 20:12:44 C 13 19 54.38 +05 41 40.5 – V C40
2021-06-10 20:19:40 C 13 19 54.26 +05 41 41.1 – V C40
2021-06-10 20:23:09 C 13 19 54.21 +05 41 41.4 – V C40
2021-06-10 20:26:38 C 13 19 54.14 +05 41 41.8 – V C40
2021-06-10 20:51:44 C 13 19 53.74 +05 41 44.0 – V C40
2021-06-10 20:53:30 C 13 19 53.72 +05 41 44.2 – V C40
2021-06-10 20:56:57 C 13 19 53.67 +05 41 44.7 – V C40
2021-06-10 20:58:43 C 13 19 53.64 +05 41 44.8 – V C40
2021-06-10 21:10:53 C 13 19 53.46 +05 41 45.9 – V C40
2021-06-10 21:12:36 C 13 19 53.44 +05 41 46.0 – V C40
2021-06-10 21:24:46 C 13 19 53.25 +05 41 46.8 – V C40
2021-06-11 07:50:07 C 13 19 45.24 +05 42 50.4 – V T08
2021-06-11 07:54:45 C 13 19 45.15 +05 42 50.7 – V T08
2021-06-11 08:03:32 C 13 19 45.00 +05 42 51.6 – V T08
2021-06-11 08:24:10 C 13 19 44.66 +05 42 53.2 – V T08
2021-06-11 19:23:39 C 13 19 36.80 +05 43 40.1 – V C40
2021-06-11 19:30:27 C 13 19 36.71 +05 43 40.7 – V C40