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
2021-04-04 10:12:57 C 14 35 24.53 -07 52 35.0 V G96
2021-04-04 10:20:23 C 14 35 24.35 -07 52 31.9 V G96
2021-04-04 10:27:49 C 14 35 24.16 -07 52 28.4 V G96
2021-04-04 11:31:36 C 14 35 23.07 -07 51 58.3 V T08
2021-04-04 11:34:16 C 14 35 23.01 -07 51 57.2 V T08
2021-04-04 11:46:54 C 14 35 22.69 -07 51 51.6 V T08
2021-04-04 11:54:13 C 14 35 22.51 -07 51 48.3 V T08
2021-04-06 13:01:13 C 14 34 11.728 -07 29 22.97 U F52
2021-04-06 13:19:43 C 14 34 11.198 -07 29 14.23 U F52
2021-04-06 13:38:15 C 14 34 10.668 -07 29 05.46 U F52
2021-04-07 09:23:01 C 14 33 39.39 -07 19 44.5 V 703
2021-04-07 09:30:35 C 14 33 39.14 -07 19 41.1 V 703
2021-04-07 09:57:59 C 14 33 38.26 -07 19 28.3 V 703
2021-04-08 11:18:15 C 14 32 55.54 -07 07 04.5 V T08
2021-04-08 11:20:56 C 14 32 55.45 -07 07 03.1 V T08
2021-04-08 11:25:34 C 14 32 55.30 -07 07 00.8 V T08
2021-04-08 11:55:53 C 14 32 54.32 -07 06 45.7 V T08
2021-04-09 17:03:44 C 14 32 01.24 -06 52 10.1 q D29
2021-04-09 17:24:06 C 14 32 00.54 -06 52 00.1 q D29
2021-04-09 17:44:27 C 14 31 59.84 -06 51 49.7 q D29
2021-04-10 00:00:16 C 14 31 48.00 -06 48 38.7 Z L74
2021-04-10 00:58:11 C 14 31 45.99 -06 48 08.8 Z L74
2021-04-10 01:56:06 C 14 31 43.99 -06 47 39.0 Z L74
2021-04-10 02:29:41 C 14 31 42.75 -06 47 10.0 V 221
2021-04-10 02:38:45 C 14 31 42.43 -06 47 05.2 V 221
2021-04-10 02:47:16 C 14 31 42.14 -06 47 00.8 V 221
2021-04-10 02:55:23 C 14 31 41.86 -06 46 56.6 V 221
2021-04-10 03:04:28 C 14 31 41.55 -06 46 51.9 V 221
2021-04-10 09:40:10 C 14 31 28.99 -06 43 38.4 V 703
2021-04-10 09:47:10 C 14 31 28.74 -06 43 34.7 V 703
2021-04-10 09:54:09 C 14 31 28.44 -06 43 31.1 V 703
2021-04-10 10:01:09 C 14 31 28.20 -06 43 27.8 V 703
2021-04-15 10:14:39 C 14 26 59.96 -05 37 36.6 V 703
2021-04-15 10:22:18 C 14 26 59.60 -05 37 32.1 V 703
2021-04-15 10:29:56 C 14 26 59.27 -05 37 27.9 V 703
2021-04-15 10:37:35 C 14 26 58.93 -05 37 23.7 V 703
2021-04-15 11:11:35 C 14 26 57.957 -05 37 01.99 U F51
2021-04-15 11:30:41 C 14 26 57.100 -05 36 50.44 U F51
2021-04-15 11:49:50 C 14 26 56.240 -05 36 39.88 U F51
2021-04-15 12:08:56 C 14 26 55.381 -05 36 28.89 U F51
2021-04-16 23:42:31 C 14 25 24.20 -05 15 47.9 V L65
2021-04-17 00:08:10 C 14 25 23.00 -05 15 32.0 V L65
2021-04-17 00:30:56 C 14 25 21.94 -05 15 18.6 V L65
2021-04-18 11:16:33 C 14 23 47.55 -04 54 23.9 V T05
2021-04-18 11:54:12 C 14 23 45.67 -04 54 01.2 V T05
2021-04-18 12:35:02 C 14 23 43.64 -04 53 36.3 V T05
2021-04-18 13:11:07 C 14 23 41.85 -04 53 14.3 V T05
2021-04-18 14:48:46 C 14 23 38.158 -04 52 05.99 V P07
2021-04-18 15:29:19 C 14 23 36.144 -04 51 41.22 V P07
2021-04-18 15:29:28 C 14 23 36.130 -04 51 41.11 V P07