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
2016-10-07 12:09:12 C 07 43 06.78 +15 55 07.0 q G96
2016-10-07 12:15:25 C 07 43 07.00 +15 55 06.0 q G96
2016-12-03 11:08:52 C 07 52 22.20 +13 39 56.4 q G96
2016-12-03 11:16:18 C 07 52 21.98 +13 39 56.5 q G96
2016-12-03 11:23:48 C 07 52 21.73 +13 39 56.6 q G96
2016-12-03 11:31:18 C 07 52 21.49 +13 39 57.2 q G96
2016-12-06 07:50:37 C 07 50 07.50 +13 41 35.7 R G45
2016-12-06 07:51:09 C 07 50 07.56 +13 41 37.0 R G45
2016-12-06 07:58:26 C 07 50 07.20 +13 41 36.2 R G45
2016-12-06 08:05:26 C 07 50 06.99 +13 41 36.5 R G45
2016-12-06 08:05:43 C 07 50 06.99 +13 41 36.5 R G45
2016-12-06 08:12:46 C 07 50 06.72 +13 41 36.6 R G45
2016-12-27 06:23:05 C 07 26 58.15 +14 21 19.5 R G45
2016-12-27 06:23:26 C 07 26 58.14 +14 21 19.6 R G45
2016-12-27 06:30:37 C 07 26 57.79 +14 21 19.1 R G45
2016-12-27 06:30:42 C 07 26 57.73 +14 21 20.6 R G45
2016-12-27 06:38:12 C 07 26 57.30 +14 21 21.3 R G45
2016-12-27 06:38:26 C 07 26 57.29 +14 21 21.8 R G45
2016-12-27 06:45:37 C 07 26 56.89 +14 21 22.4 R G45
2016-12-27 07:00:43 C 07 26 56.06 +14 21 24.0 R G45
2016-12-27 16:52:18 C 07 26 23.52 +14 22 36.5 q D29
2016-12-27 17:35:34 C 07 26 21.10 +14 22 41.3 q D29
2016-12-29 04:20:37 C 07 24 26.23 +14 26 59.0 R G45
2016-12-29 04:21:09 C 07 24 26.21 +14 26 59.0 R G45
2016-12-29 04:27:31 C 07 24 25.82 +14 26 59.6 R G45
2016-12-29 04:28:37 C 07 24 25.78 +14 26 59.5 R G45
2016-12-29 04:35:00 C 07 24 25.43 +14 27 00.7 R G45
2016-12-29 04:41:22 C 07 24 25.05 +14 27 01.2 R G45
2016-12-29 04:41:54 C 07 24 25.03 +14 27 01.6 R G45
2016-12-29 04:48:25 C 07 24 24.63 +14 27 02.2 R G45
2016-12-29 04:49:29 C 07 24 24.57 +14 27 02.7 R G45
2016-12-29 04:55:28 C 07 24 24.31 +14 27 03.2 R G45
2017-01-19 03:36:54 C 06 56 48.29 +15 39 47.2 q W34
2017-12-20 11:48:08 C 12 00 20.13 -01 00 14.3 U G96
2017-12-20 11:55:33 C 12 00 20.38 -01 00 15.4 U G96
2017-12-20 12:02:58 C 12 00 20.57 -01 00 16.3 U G96
2017-12-20 12:10:22 C 12 00 20.80 -01 00 17.7 U G96
2018-02-25 18:24:34 C 12 01 44.70 +00 17 07.6 q D29
2018-02-25 18:46:13 C 12 01 43.89 +00 17 14.4 q D29
2018-02-26 06:36:15 C 12 01 17.53 +00 21 07.6 U 703
2018-02-26 06:43:50 C 12 01 17.30 +00 21 09.1 U 703
2018-02-26 06:51:26 C 12 01 17.01 +00 21 12.2 U 703
2018-02-26 06:59:02 C 12 01 16.68 +00 21 16.0 U 703
2018-03-10 09:40:07 C 11 48 35.397 +02 09 53.65 U F51
2018-03-10 09:54:16 C 11 48 34.687 +02 09 59.46 U F51
2018-03-10 09:57:03 C 11 48 34.546 +02 10 00.60 U F51
2018-03-10 10:11:17 C 11 48 33.830 +02 10 06.38 U F51
2018-03-10 10:14:05 C 11 48 33.690 +02 10 07.55 U F51
2018-03-10 10:28:22 C 11 48 32.968 +02 10 13.40 U F51
2018-03-13 15:50:19 C 11 44 42.17 +02 42 21.9 q D29