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
2021-11-08 07:28:35 C 23 41 15.61 -12 47 27.5 V T05
2021-11-08 07:33:51 C 23 41 16.29 -12 47 22.7 V T05
2021-11-08 07:41:49 C 23 41 17.29 -12 47 15.5 V T05
2021-11-08 07:57:09 C 23 41 19.24 -12 47 01.6 V T05
2021-11-09 07:09:28 C 23 44 21.57 -12 26 13.7 V T08
2021-11-09 07:14:07 C 23 44 22.15 -12 26 09.7 V T08
2021-11-09 07:57:09 C 23 44 27.48 -12 25 31.1 V T08
2021-11-09 08:06:26 C 23 44 28.64 -12 25 22.6 V T08
2021-11-10 08:21:00 C 23 47 34.10 -12 03 53.3 V T08
2021-11-10 08:26:19 C 23 47 34.75 -12 03 48.6 V T08
2021-11-10 08:35:37 C 23 47 35.87 -12 03 40.4 V T08
2021-11-10 08:50:20 C 23 47 37.66 -12 03 27.3 V T08
2021-11-10 19:57:04 C 23 49 01.42 -11 53 47.0 V 089
2021-11-10 20:07:03 C 23 49 02.63 -11 53 38.4 V 089
2021-11-10 20:12:27 C 23 49 03.27 -11 53 33.6 V 089
2021-11-10 20:17:13 C 23 49 03.87 -11 53 29.4 V 089
2021-11-11 02:32:29 C 23 49 51.20 -11 47 58.1 V 703
2021-11-11 02:40:21 C 23 49 52.14 -11 47 51.3 V 703
2021-11-11 02:48:13 C 23 49 53.09 -11 47 44.5 V 703
2021-11-11 02:56:05 C 23 49 54.03 -11 47 37.6 V 703
2021-11-20 09:27:04 C 00 14 53.49 -08 42 17.8 V T05
2021-11-20 09:33:01 C 00 14 54.08 -08 42 12.9 V T05
2021-11-20 09:43:38 C 00 14 55.14 -08 42 04.5 V T05
2021-11-20 09:58:50 C 00 14 56.67 -08 41 52.3 V T05
2021-11-22 19:18:27 C 00 20 43.71 -07 57 03.9 V K87
2021-11-22 19:20:34 C 00 20 43.90 -07 57 02.3 V K87
2021-11-22 19:24:48 C 00 20 44.28 -07 57 00.1 V K87
2021-11-22 19:29:01 C 00 20 44.73 -07 56 55.6 V K87
2021-11-22 19:33:15 C 00 20 45.12 -07 56 52.8 V K87
2021-11-23 05:18:34 C 00 21 43.047 -07 49 15.37 U F51
2021-11-23 05:36:03 C 00 21 44.698 -07 49 01.91 U F51
2021-11-23 05:53:30 C 00 21 46.344 -07 48 48.48 U F51
2021-11-24 05:16:43 C 00 24 02.54 -07 30 55.0 Z U76
2021-11-24 05:26:45 C 00 24 03.48 -07 30 47.2 Z U76
2021-11-24 05:27:19 C 00 24 04.084 -07 30 44.27 U F51
2021-11-24 05:41:01 C 00 24 04.79 -07 30 36.3 Z U76
2021-11-24 05:44:33 C 00 24 05.684 -07 30 31.19 U F51
2021-11-24 06:01:46 C 00 24 07.277 -07 30 18.13 U F51
2021-11-24 06:58:21 C 00 24 12.53 -07 29 34.9 V T05
2021-11-24 07:02:57 C 00 24 12.96 -07 29 31.4 V T05
2021-11-24 07:15:32 C 00 24 14.13 -07 29 21.7 V T05
2021-11-24 07:30:12 C 00 24 15.48 -07 29 10.5 V T05
2021-11-26 08:03:02 C 00 28 52.50 -06 52 30.3 V T08
2021-11-26 08:08:20 C 00 28 52.98 -06 52 26.2 V T08
2021-11-26 08:12:59 C 00 28 53.39 -06 52 22.7 V T08
2021-11-26 08:22:17 C 00 28 54.25 -06 52 15.6 V T08
2021-11-26 08:28:17 C 00 28 54.79 -06 52 11.2 V T08
2021-11-26 08:37:36 C 00 28 55.64 -06 52 04.3 V T08
2021-11-27 20:03:08 C 00 32 13.44 -06 25 50.1 V 511
2021-11-27 20:14:59 C 00 32 14.51 -06 25 41.0 V 511