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
2021-05-05 14:37:30 C 14 00 25.17 -00 25 46.8 q D29
2021-05-05 14:57:52 C 14 00 23.80 -00 25 33.3 q D29
2021-05-05 22:35:50 C 13 59 54.60 -00 20 34.4 V L65
2021-05-05 22:52:40 C 13 59 53.48 -00 20 23.3 V L65
2021-05-05 23:04:42 C 13 59 52.68 -00 20 15.3 V L65
2021-05-06 06:34:18 C 13 59 24.26 -00 15 16.7 V U52
2021-05-06 06:38:06 C 13 59 24.01 -00 15 14.1 V U52
2021-05-06 06:41:53 C 13 59 23.72 -00 15 11.4 V U52
2021-05-07 23:10:55 C 13 56 48.41 +00 11 16.6 V L65
2021-05-07 23:21:05 C 13 56 47.75 +00 11 23.0 V L65
2021-05-07 23:33:33 C 13 56 46.92 +00 11 31.2 V L65
2021-05-08 10:03:33 C 13 56 06.66 +00 18 26.3 V T05
2021-05-08 10:08:12 C 13 56 06.34 +00 18 29.3 V T05
2021-05-08 10:22:29 C 13 56 05.37 +00 18 38.6 V T05
2021-05-08 10:30:00 C 13 56 04.86 +00 18 43.4 V T05
2021-05-08 11:59:17 C 13 56 00.178 +00 19 52.25 V P07
2021-05-08 13:22:11 C 13 55 54.617 +00 20 45.64 V P07
2021-05-08 13:25:41 C 13 55 54.379 +00 20 48.05 V P07
2021-05-08 13:59:14 C 13 55 52.116 +00 21 09.79 V P07
2021-05-08 16:14:49 C 13 55 42.900 +00 22 37.20 V P07
2021-05-08 17:32:43 C 13 55 37.634 +00 23 27.28 V P07
2021-05-08 20:39:00 C 13 55 26.25 +00 25 09.2 V L99
2021-05-08 20:52:11 C 13 55 25.40 +00 25 18.1 V L99
2021-05-08 21:05:32 C 13 55 24.52 +00 25 26.5 V L99
2021-05-08 21:18:22 C 13 55 23.64 +00 25 35.3 V L99
2021-05-09 06:58:48 C 13 54 46.52 +00 31 51.2 V G96
2021-05-09 07:06:18 C 13 54 46.01 +00 31 55.9 V G96
2021-05-09 07:13:47 C 13 54 45.50 +00 32 00.7 V G96
2021-05-09 07:21:16 C 13 54 45.00 +00 32 05.5 V G96
2021-05-09 21:30:33 C 13 53 51.00 +00 41 03.6 V L99
2021-05-09 21:42:52 C 13 53 50.15 +00 41 11.2 V L99
2021-05-09 21:53:32 C 13 53 49.51 +00 41 17.2 V L99
2021-05-10 08:23:34 C 13 53 09.753 +00 48 03.66 U F51
2021-05-10 08:41:27 C 13 53 08.12 +00 48 07.7 V U55
2021-05-10 08:44:48 C 13 53 08.311 +00 48 17.04 U F51
2021-05-10 09:06:06 C 13 53 06.869 +00 48 30.52 U F51
2021-05-10 09:22:47 C 13 53 05.34 +00 48 34.4 V U55
2021-05-10 09:27:27 C 13 53 05.419 +00 48 43.97 U F51
2021-05-10 10:17:27 C 13 53 02.02 +00 49 15.8 V T08
2021-05-10 10:22:10 C 13 53 01.71 +00 49 18.8 V T08
2021-05-10 10:32:27 C 13 53 01.01 +00 49 25.2 V T08
2021-05-10 10:47:10 C 13 53 00.02 +00 49 34.6 V T08
2021-05-10 16:52:53 C 13 52 37.49 +00 53 20.1 V 186
2021-05-10 16:53:55 C 13 52 37.45 +00 53 20.4 V 186
2021-05-10 20:53:40 C 13 52 21.41 +00 55 51.0 V 186
2021-05-10 20:54:42 C 13 52 21.34 +00 55 52.2 V 186
2021-05-11 16:04:24 C 13 51 09.52 +01 07 47.7 V 186
2021-05-11 16:05:26 C 13 51 09.43 +01 07 48.4 V 186
2021-05-11 20:20:29 C 13 50 52.53 +01 10 26.5 V 186
2021-05-11 20:21:31 C 13 50 52.45 +01 10 26.8 V 186