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
2015-03-09 08:35:46 C 10 08 38.57 +09 44 06.9 q 703
2015-03-09 08:47:20 C 10 08 38.04 +09 44 10.9 q 703
2015-03-09 08:53:07 C 10 08 37.66 +09 44 12.7 q 703
2015-03-11 03:22:10 C 10 06 42.25 +09 57 48.2 o 691
2015-03-11 04:09:16 C 10 06 40.09 +09 58 04.2 o 691
2015-03-11 04:56:15 C 10 06 37.87 +09 58 18.3 o 691
2015-03-14 07:27:04 C 10 03 21.469 +10 21 29.08 L F51
2015-03-14 07:45:13 C 10 03 20.664 +10 21 34.63 L F51
2015-03-14 08:03:24 C 10 03 19.862 +10 21 40.24 L F51
2015-03-14 08:21:43 C 10 03 19.054 +10 21 45.82 L F51
2015-03-15 03:19:33 C 10 02 30.70 +10 27 29.5 o 691
2015-03-15 04:10:34 C 10 02 28.47 +10 27 45.0 o 691
2015-03-15 05:01:34 C 10 02 26.28 +10 28 00.3 o 691
2015-03-16 07:10:50 C 10 01 20.42 +10 35 48.3 R G45
2015-03-16 07:20:50 C 10 01 19.92 +10 35 51.9 R G45
2015-03-16 07:45:41 C 10 01 18.92 +10 35 58.8 R G45
2015-03-16 07:55:41 C 10 01 18.54 +10 36 00.9 R G45
2015-03-16 07:58:07 C 10 01 18.38 +10 36 02.1 R G45
2015-03-16 08:08:24 C 10 01 17.97 +10 36 06.1 R G45
2015-03-16 08:19:48 C 10 01 17.47 +10 36 09.2 R G45
2015-03-16 14:52:01 C 10 01 01.43 +10 38 04.9 q D29
2015-03-16 15:12:20 C 10 01 00.61 +10 38 10.8 q D29
2015-03-17 07:00:14 C 10 00 21.73 +10 42 48.0 R G45
2015-03-17 07:10:19 C 10 00 21.31 +10 42 51.3 R G45
2015-03-17 07:22:09 C 10 00 20.82 +10 42 54.4 R G45
2015-03-17 07:44:23 C 10 00 19.92 +10 43 01.5 R G45
2015-03-17 07:56:53 C 10 00 19.35 +10 43 04.6 R G45
2015-03-17 08:18:15 C 10 00 18.47 +10 43 10.8 R G45
2015-03-25 06:03:48 C 09 53 17.47 +11 34 21.0 q G96
2015-03-25 06:11:07 C 09 53 17.24 +11 34 22.8 q G96
2015-03-25 06:18:27 C 09 53 16.98 +11 34 24.4 q G96
2015-03-25 06:22:09 C 09 53 16.86 +11 34 25.5 R G45
2015-03-25 06:25:47 C 09 53 16.74 +11 34 26.3 q G96
2015-03-25 06:55:58 C 09 53 15.67 +11 34 34.2 R G45
2015-03-25 07:05:55 C 09 53 15.37 +11 34 36.5 R G45
2015-03-25 07:18:17 C 09 53 14.92 +11 34 39.4 R G45
2015-03-25 07:38:16 C 09 53 14.25 +11 34 44.3 R G45
2015-04-08 13:05:19 C 09 44 43.66 +12 43 09.7 q D29
2015-04-08 13:25:39 C 09 44 43.21 +12 43 12.5 q D29
2015-04-08 13:45:58 C 09 44 42.87 +12 43 16.2 q D29
2015-04-09 04:40:48 C 09 44 28.54 +12 45 31.0 q G96
2015-04-09 04:48:09 C 09 44 28.42 +12 45 32.0 q G96
2015-04-09 04:55:31 C 09 44 28.28 +12 45 33.1 q G96
2015-04-09 05:02:52 C 09 44 28.18 +12 45 34.4 q G96
2015-05-30 04:12:01 C 09 59 16.56 +12 36 10.9 q G96
2015-05-30 04:19:22 C 09 59 16.77 +12 36 09.4 q G96
2015-05-30 04:26:45 C 09 59 17.06 +12 36 08.6 q G96
2015-05-30 04:34:07 C 09 59 17.25 +12 36 06.3 q G96
2016-10-07 11:50:34 C 07 43 06.04 +15 55 10.1 q G96
2016-10-07 12:03:02 C 07 43 06.53 +15 55 08.3 q G96