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
2018-04-18 06:02:07 C 11 04 42.21 +08 08 23.7 U 703
2018-04-20 05:21:57 C 11 03 15.52 +08 20 24.5 U G96
2018-04-20 05:29:24 C 11 03 15.28 +08 20 25.8 U G96
2018-04-20 05:36:50 C 11 03 15.02 +08 20 27.7 U G96
2018-04-21 05:14:27 C 11 02 34.67 +08 26 06.2 U 703
2018-04-21 05:21:57 C 11 02 34.45 +08 26 07.7 U 703
2018-04-21 05:29:26 C 11 02 34.25 +08 26 09.5 U 703
2018-04-21 05:36:55 C 11 02 34.00 +08 26 11.3 U 703
2018-04-23 03:07:01 C 11 01 21.94 +08 36 24.9 U 703
2018-04-23 03:15:51 C 11 01 21.64 +08 36 25.3 U 703
2018-04-23 03:24:38 C 11 01 21.39 +08 36 27.6 U 703
2018-04-23 03:33:23 C 11 01 21.18 +08 36 27.8 U 703
2018-06-12 03:52:04 C 11 12 00.58 +08 16 39.8 U G96
2018-06-12 04:00:21 C 11 12 00.88 +08 16 38.3 U G96
2018-06-12 04:08:36 C 11 12 01.19 +08 16 36.0 U G96
2018-06-12 04:16:52 C 11 12 01.51 +08 16 34.4 U G96
2019-01-08 02:02:15 C 22 02 17.44 -13 00 40.5 I41
2019-01-08 02:09:16 C 22 02 18.67 -13 00 34.7 I41
2019-01-08 02:16:16 C 22 02 19.91 -13 00 29.2 I41
2019-01-08 02:23:17 C 22 02 21.16 -13 00 23.6 I41
2019-01-28 02:11:03 C 23 21 59.72 -06 13 33.4 U I41
2019-01-28 02:25:16 C 23 22 01.90 -06 13 20.9 U I41
2019-01-31 02:29:53 C 23 33 03.15 -05 11 08.4 U I41
2019-01-31 02:36:56 C 23 33 04.21 -05 11 02.4 U I41
2019-10-25 12:03:50 C 08 51 45.71 +12 55 22.9 V G96
2019-10-25 12:10:41 C 08 51 45.89 +12 55 21.3 V G96
2019-10-25 12:17:31 C 08 51 46.17 +12 55 20.0 V G96
2019-10-25 12:24:21 C 08 51 46.36 +12 55 19.5 V G96
2019-11-08 14:04:56 C 09 00 20.899 +12 03 58.88 U F51
2019-11-08 14:22:57 C 09 00 21.245 +12 03 56.43 U F51
2019-11-08 14:40:55 C 09 00 21.577 +12 03 54.00 U F51
2019-11-08 14:58:56 C 09 00 21.907 +12 03 51.70 U F51
2019-12-08 12:26:40 C 09 03 34.384 +11 13 53.05 U F52
2019-12-08 12:43:27 C 09 03 34.146 +11 13 52.85 U F52
2019-12-08 13:17:07 C 09 03 33.712 +11 13 53.10 U F52
2019-12-20 10:12:30 C 08 58 07.34 +11 24 58.2 V G96
2019-12-20 10:19:55 C 08 58 07.15 +11 24 58.8 V G96
2019-12-20 10:27:20 C 08 58 06.91 +11 24 59.0 V G96
2019-12-20 10:34:45 C 08 58 06.71 +11 24 59.8 V G96
2020-01-01 13:34:08 C 08 48 32.892 +11 56 32.80 U F51
2020-01-01 13:53:45 C 08 48 32.102 +11 56 35.56 U F51
2020-01-01 14:13:16 C 08 48 31.313 +11 56 38.29 U F51
2020-01-01 14:32:49 C 08 48 30.528 +11 56 41.00 U F51
2020-01-02 00:55:20 C 08 48 06.22 +11 58 08.6 V C95
2020-01-02 01:00:54 C 08 48 05.92 +11 58 08.6 V C95
2020-01-02 01:06:25 C 08 48 05.74 +11 58 09.5 V C95
2020-01-06 06:24:02 C 08 43 53.82 +12 13 47.2 V G96
2020-01-06 06:31:28 C 08 43 53.49 +12 13 48.5 V G96
2020-01-06 06:38:56 C 08 43 53.18 +12 13 49.9 V G96
2020-01-06 06:46:21 C 08 43 52.83 +12 13 50.9 V G96