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
2021-05-15 20:03:00 C 13 44 57.76 +02 07 18.1 – V 089
2021-05-15 20:06:20 C 13 44 57.57 +02 07 20.4 – V 089
2021-05-15 20:09:41 C 13 44 57.37 +02 07 22.3 – V 089
2021-05-15 20:13:01 C 13 44 57.17 +02 07 24.0 – V 089
2021-05-15 20:16:21 C 13 44 56.96 +02 07 26.2 – V 089
2021-05-16 12:34:25 C 13 43 58.723 +02 16 56.35 – V P07
2021-05-16 13:35:48 C 13 43 54.814 +02 17 30.77 – V P07
2021-05-16 15:39:52 C 13 43 46.889 +02 18 39.96 – V P07
2021-05-16 16:52:00 C 13 43 42.302 +02 19 20.46 – V P07
2021-05-16 16:52:47 C 13 43 42.269 +02 19 20.75 – V P07
2021-05-17 08:33:59 C 13 42 47.05 +02 27 49.4 – V T05
2021-05-17 08:48:40 C 13 42 46.13 +02 27 57.5 – V T05
2021-05-17 09:00:12 C 13 42 45.39 +02 28 03.8 – V T05
2021-05-17 09:04:41 C 13 42 45.11 +02 28 06.3 – V T05
2021-05-18 08:43:26 C 13 41 22.36 +02 40 53.4 – V T08
2021-05-18 08:51:24 C 13 41 21.88 +02 40 57.8 – V T08
2021-05-18 09:06:02 C 13 41 20.94 +02 41 05.4 – V T08
2021-05-18 09:41:41 C 13 41 18.75 +02 41 24.5 – V T08
2021-05-18 18:38:19 C 13 40 48.56 +02 46 23.2 – q L68
2021-05-18 18:58:14 C 13 40 47.37 +02 46 33.8 – q L68
2021-05-18 19:00:45 C 13 40 47.21 +02 46 34.9 – q L68
2021-05-19 19:26:41 C 13 39 23.85 +02 58 53.3 – V 089
2021-05-19 19:30:01 C 13 39 23.67 +02 58 55.6 – V 089
2021-05-19 19:33:21 C 13 39 23.45 +02 58 57.4 – V 089
2021-05-19 19:36:41 C 13 39 23.25 +02 58 59.0 – V 089
2021-05-19 19:40:01 C 13 39 23.06 +02 59 00.4 – V 089
2021-05-19 19:43:21 C 13 39 22.86 +02 59 02.6 – V 089
2021-05-19 19:46:41 C 13 39 22.65 +02 59 04.1 – V 089
2021-05-20 08:49:52 C 13 38 38.89 +03 05 46.4 – V T05
2021-05-20 08:55:47 C 13 38 38.53 +03 05 49.3 – V T05
2021-05-20 09:06:22 C 13 38 37.91 +03 05 54.8 – V T05
2021-05-20 09:37:43 C 13 38 36.03 +03 06 10.3 – V T05
2021-05-21 12:02:34 C 13 37 10.464 +03 19 21.40 – V P07
2021-05-21 12:47:46 C 13 37 07.831 +03 19 43.21 – V P07
2021-05-21 12:49:14 C 13 37 07.762 +03 19 43.90 – V P07
2021-05-21 13:40:47 C 13 37 04.757 +03 20 08.63 – V P07
2021-05-21 15:25:31 C 13 36 58.694 +03 20 59.06 – V P07
2021-05-21 20:29:16 C 13 36 42.60 +03 23 05.7 – V 089
2021-05-21 20:32:37 C 13 36 42.44 +03 23 07.8 – V 089
2021-05-21 20:35:57 C 13 36 42.25 +03 23 09.2 – V 089
2021-05-21 20:39:17 C 13 36 42.04 +03 23 10.7 – V 089
2021-05-21 20:42:37 C 13 36 41.87 +03 23 12.2 – V 089
2021-05-21 21:20:34 C 13 36 39.88 +03 23 31.4 – V K73
2021-05-21 21:26:06 C 13 36 39.58 +03 23 33.7 – V K73
2021-05-21 21:31:35 C 13 36 39.21 +03 23 37.1 – V K73
2021-05-22 19:12:24 C 13 35 31.14 +03 33 43.5 – V 089
2021-05-22 19:15:44 C 13 35 30.97 +03 33 45.5 – V 089
2021-05-22 19:19:04 C 13 35 30.77 +03 33 46.8 – V 089
2021-05-22 19:22:24 C 13 35 30.57 +03 33 49.3 – V 089
2021-05-22 19:25:44 C 13 35 30.40 +03 33 50.0 – V 089