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
2021-07-07 07:57:09 C 13 29 48.50 +04 19 54.1 V T05
2021-07-09 06:27:35 C 13 31 55.36 +04 04 07.2 V T08
2021-07-09 06:32:15 C 13 31 55.56 +04 04 05.6 V T08
2021-07-09 06:40:13 C 13 31 55.90 +04 04 02.7 V T08
2021-07-09 06:54:50 C 13 31 56.53 +04 03 57.6 V T08
2021-07-11 06:15:28 C 13 34 16.60 +03 46 38.6 V T05
2021-07-11 06:20:45 C 13 34 16.86 +03 46 36.7 V T05
2021-07-11 06:31:19 C 13 34 17.34 +03 46 32.6 V T05
2021-07-11 06:46:00 C 13 34 18.03 +03 46 27.0 V T05
2021-07-13 06:26:45 C 13 36 50.20 +03 27 47.1 V T08
2021-07-13 06:32:44 C 13 36 50.49 +03 27 44.6 V T08
2021-07-13 06:46:41 C 13 36 51.20 +03 27 38.9 V T08
2021-07-13 07:13:54 C 13 36 52.59 +03 27 27.9 V T08
2021-07-14 18:59:31 C 13 38 54.21 +03 12 31.8 V 089
2021-07-14 19:02:51 C 13 38 54.40 +03 12 29.5 V 089
2021-07-15 04:18:53 C 13 39 26.91 +03 08 36.2 q U76
2021-07-15 04:36:29 C 13 39 27.82 +03 08 29.1 q U76
2021-07-15 04:55:43 C 13 39 28.96 +03 08 20.6 q U76
2021-07-19 06:12:38 C 13 45 35.17 +02 24 13.6 V T05
2021-07-19 06:18:34 C 13 45 35.55 +02 24 10.8 V T05
2021-07-19 06:27:15 C 13 45 36.10 +02 24 06.7 V T05
2021-07-19 06:42:58 C 13 45 37.05 +02 23 59.1 V T05
2021-07-19 21:36:24 C 13 46 37.03 +02 16 45.0 o Z22
2021-07-19 21:39:03 C 13 46 37.24 +02 16 43.7 o Z22
2021-07-19 23:42:12 C 13 46 46.02 +02 16 03.5 o W92
2021-07-19 23:58:07 C 13 46 46.92 +02 15 57.2 o W92
2021-07-20 00:14:06 C 13 46 47.98 +02 15 47.7 o W92
2021-07-21 00:17:34 C 13 48 27.39 +02 03 54.5 o W92
2021-07-21 00:33:38 C 13 48 28.49 +02 03 46.4 o W92
2021-07-22 06:04:05 C 13 50 34.30 +01 48 28.9 V T05
2021-07-22 06:09:21 C 13 50 34.66 +01 48 26.0 V T05
2021-07-22 06:19:56 C 13 50 35.36 +01 48 20.0 V T05
2021-07-22 06:34:32 C 13 50 36.34 +01 48 13.2 V T05
2021-07-23 07:03:49 C 13 52 23.77 +01 35 25.3 V T05
2021-07-23 07:08:27 C 13 52 24.09 +01 35 23.0 V T05
2021-07-23 07:17:02 C 13 52 24.68 +01 35 18.2 V T05
2021-07-23 07:32:56 C 13 52 25.82 +01 35 09.9 V T05
2021-07-25 06:34:44 C 13 56 00.63 +01 09 43.7 V T08
2021-07-25 06:40:02 C 13 56 01.03 +01 09 40.8 V T08
2021-07-25 06:48:00 C 13 56 01.61 +01 09 36.4 V T08
2021-07-25 07:05:18 C 13 56 02.88 +01 09 26.7 V T08
2021-07-26 21:43:31 C 13 59 07.26 +00 47 36.8 o Z22
2021-07-26 22:28:48 C 13 59 10.76 +00 47 10.9 o Z22
2021-07-29 06:45:41 C 14 03 52.72 +00 14 03.4 V T08
2021-07-29 06:50:59 C 14 03 53.15 +00 14 00.1 V T08
2021-07-29 06:58:57 C 14 03 53.79 +00 13 55.3 V T08
2021-07-29 07:14:12 C 14 03 55.05 +00 13 46.1 V T08
2021-07-31 06:54:34 C 14 08 06.38 -00 15 43.1 V T05
2021-07-31 06:59:52 C 14 08 06.84 -00 15 46.4 V T05
2021-07-31 07:08:27 C 14 08 07.59 -00 15 51.8 V T05