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
1999-04-13 12:19:28 C 14 05 06.38 -04 42 24.0 426
1999-04-13 12:29:44 C 14 05 05.90 -04 42 18.3 426
1999-04-13 12:39:59 C 14 05 05.37 -04 42 12.6 426
1999-04-13 13:06:59 C 14 05 03.84 -04 41 57.4 422
1999-04-13 13:08:36 C 14 05 03.76 -04 41 56.5 422
1999-04-13 13:10:37 C 14 05 03.66 -04 41 55.2 422
1999-04-13 21:23:04 C 14 04 40.13 -04 37 27.2 z 587
1999-04-13 21:33:09 C 14 04 39.63 -04 37 21.3 z 587
1999-04-13 21:39:55 C 14 04 39.28 -04 37 17.6 z 587
1999-04-13 21:53:26 C 14 04 38.59 -04 37 08.2 z 108
1999-04-13 22:00:21 C 14 04 38.30 -04 37 05.1 z 108
1999-04-13 22:07:07 C 14 04 37.92 -04 37 00.3 z 108
1999-04-13 23:48:22 C 14 04 32.79 -04 36 04.1 557
1999-04-13 23:51:12 C 14 04 32.64 -04 36 02.5 557
1999-04-13 23:54:04 C 14 04 32.50 -04 36 00.9 557
1999-04-14 01:55:03 C 14 04 27.26 -04 34 48.5 c 758
1999-04-14 02:10:58 C 14 04 26.46 -04 34 38.4 c 758
1999-04-14 02:17:45 C 14 04 26.15 -04 34 31.7 c 758
1999-04-14 02:28:19 C 14 04 25.58 -04 34 28.3 c 758
1999-04-14 03:46:33 C 14 04 21.38 -04 33 32.0 c 844
1999-04-14 04:18:19 C 14 04 19.67 -04 33 13.5 c 844
1999-04-14 14:10:44 C 14 03 50.94 -04 27 31.3 426
1999-04-14 14:25:31 C 14 03 50.13 -04 27 22.5 426
1999-04-14 14:35:33 C 14 03 49.66 -04 27 17.2 426
1999-04-14 14:45:23 C 14 03 49.11 -04 27 24.4 z 903
1999-04-14 14:50:26 C 14 03 48.82 -04 27 21.1 z 903
1999-04-14 15:00:35 C 14 03 48.32 -04 27 15.3 z 903
1999-04-14 20:33:05 C 14 03 32.23 -04 24 02.8 d 046
1999-04-14 20:36:14 C 14 03 32.06 -04 24 00.8 d 046
1999-04-14 20:39:13 C 14 03 31.91 -04 23 59.1 d 046
1999-04-14 20:43:48 C 14 03 31.67 -04 23 56.4 d 046
1999-04-14 20:47:50 C 14 03 31.48 -04 23 54.1 d 046
1999-04-15 04:38:26 C 14 03 07.55 -04 19 04.9 c 844
1999-04-15 05:08:20 C 14 03 05.95 -04 18 47.1 c 844
1999-04-15 05:19:59 C 14 03 05.32 -04 18 40.2 c 844
1999-04-15 06:31:31 C 14 03 02.06 -04 18 11.3 17.4 a 704
1999-04-15 06:57:10 C 14 03 00.78 -04 17 57.1 17.9 a 704
1999-04-15 07:22:41 C 14 02 59.37 -04 17 41.7 17.8 a 704
1999-04-15 07:48:08 C 14 02 57.98 -04 17 25.7 17.5 a 704
1999-04-15 08:14:02 C 14 02 56.66 -04 17 11.8 17.7 a 704
1999-04-15 12:22:02 C 14 02 44.56 -04 14 34.0 z 428
1999-04-15 12:22:20 C 14 02 44.56 -04 14 33.4 422
1999-04-15 12:23:42 C 14 02 44.49 -04 14 32.6 422
1999-04-15 12:24:46 C 14 02 44.44 -04 14 32.0 422
1999-04-15 12:32:08 C 14 02 44.05 -04 14 28.3 z 428
1999-04-16 10:04:10 C 14 01 37.13 -04 01 55.0 16.8 a 704
1999-04-16 10:20:07 C 14 01 36.29 -04 01 46.6 17.1 a 704
1999-04-16 10:36:05 C 14 01 35.44 -04 01 37.8 17.1 a 704
1999-04-16 10:51:39 C 14 01 34.60 -04 01 27.9 17.0 a 704
1999-04-16 11:06:51 C 14 01 33.71 -04 01 19.9 17.0 a 704