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
2021-12-20 19:33:44 C 01 18 00.36 -00 14 55.2 X K87
2021-12-20 19:36:54 C 01 18 00.63 -00 14 53.0 X K87
2021-12-20 19:40:04 C 01 18 00.87 -00 14 51.0 X K87
2022-01-04 03:58:38 C 01 43 57.60 +03 06 35.9 o 691
2022-01-04 04:19:25 C 01 43 59.12 +03 06 47.3 o 691
2022-01-04 04:38:28 C 01 44 00.51 +03 06 58.0 o 691
2022-01-05 04:19:06 C 01 45 45.91 +03 20 05.4 V 703
2022-01-05 04:27:23 C 01 45 46.43 +03 20 10.7 V 703
2022-01-05 04:35:40 C 01 45 47.06 +03 20 14.4 V 703
2022-01-05 04:43:58 C 01 45 47.62 +03 20 19.9 V 703
2022-01-05 06:32:36 C 01 45 55.74 +03 21 21.6 V T08
2022-01-05 06:37:15 C 01 45 56.12 +03 21 23.5 V T08
2022-01-05 06:47:53 C 01 45 56.88 +03 21 29.6 V T08
2022-01-05 07:11:07 C 01 45 58.60 +03 21 42.5 V T08
2022-01-07 06:29:14 C 01 49 28.61 +03 47 40.0 V T05
2022-01-07 06:33:51 C 01 49 28.90 +03 47 42.6 V T05
2022-01-07 06:43:05 C 01 49 29.58 +03 47 47.9 V T05
2022-01-07 07:07:02 C 01 49 31.31 +03 48 00.8 V T05
2022-01-08 02:08:22 C 01 50 55.82 +03 58 19.8 V G96
2022-01-08 02:16:30 C 01 50 56.41 +03 58 24.3 V G96
2022-01-08 02:24:39 C 01 50 57.00 +03 58 28.7 V G96
2022-01-08 02:32:48 C 01 50 57.58 +03 58 33.1 V G96
2022-01-14 03:21:09 C 02 01 37.10 +05 15 24.9 V 703
2022-01-14 03:29:03 C 02 01 37.61 +05 15 27.8 V 703
2022-01-14 03:36:56 C 02 01 38.14 +05 15 33.3 V 703
2022-01-14 03:44:50 C 02 01 38.72 +05 15 37.1 V 703
2022-01-15 19:38:33 C 02 04 34.46 +05 36 11.9 V K83
2022-01-15 19:47:10 C 02 04 35.06 +05 36 16.7 V K83
2022-01-15 19:55:48 C 02 04 35.71 +05 36 20.3 V K83
2022-01-18 06:25:36 C 02 08 52.996 +06 06 08.81 U F52
2022-01-18 06:58:54 C 02 08 55.387 +06 06 25.53 U F52
2022-01-18 07:15:23 C 02 08 56.574 +06 06 33.89 U F52
2022-01-24 04:00:49 C 02 19 14.81 +07 16 00.5 V 703
2022-01-24 04:08:25 C 02 19 15.41 +07 16 04.0 V 703
2022-01-24 04:16:01 C 02 19 16.01 +07 16 07.0 V 703
2022-01-24 04:23:36 C 02 19 16.55 +07 16 11.7 V 703
2022-01-25 01:56:29 C 02 20 51.33 +07 26 33.4 V G96
2022-01-25 02:04:35 C 02 20 51.90 +07 26 37.1 V G96
2022-01-25 02:12:40 C 02 20 52.49 +07 26 41.0 V G96
2022-01-25 02:20:45 C 02 20 53.07 +07 26 45.0 V G96
2022-01-28 03:38:58 C 02 26 14.84 +08 01 27.8 V 703
2022-01-28 03:47:18 C 02 26 15.40 +08 01 33.6 V 703
2022-01-28 03:55:37 C 02 26 16.12 +08 01 37.4 V 703
2022-01-28 04:03:56 C 02 26 16.72 +08 01 41.7 V 703
2022-02-03 03:49:49 C 02 36 48.97 +09 07 32.3 V V00
2022-02-03 03:59:11 C 02 36 49.65 +09 07 36.5 V V00
2022-02-03 04:08:32 C 02 36 50.33 +09 07 40.6 V V00
2022-02-03 04:17:57 C 02 36 51.02 +09 07 44.8 V V00
2022-02-20 03:53:51 C 03 06 53.21 +11 57 33.9 V 703
2022-02-20 04:02:06 C 03 06 53.84 +11 57 37.9 V 703