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
1999-05-01 21:45:12 C 13 39 37.63 -00 10 17.3 z 151
1999-05-01 21:56:55 C 13 39 36.90 -00 10 09.7 z 151
1999-05-01 21:59:31 C 13 39 36.70 -00 10 07.9 z 151
1999-05-01 22:02:06 C 13 39 36.62 -00 10 07.3 z 151
1999-05-01 22:04:43 C 13 39 36.39 -00 10 04.8 z 151
1999-05-04 20:08:17 C 13 35 11.47 +00 32 41.4 z 151
1999-05-04 20:14:03 C 13 35 11.04 +00 32 45.7 z 151
1999-05-04 20:19:52 C 13 35 10.61 +00 32 49.1 z 151
1999-05-04 20:24:58 C 13 35 10.36 +00 32 51.7 z 151
1999-05-04 20:30:20 C 13 35 10.00 +00 32 55.3 z 151
1999-05-04 20:44:52 C 13 35 09.06 +00 33 03.5 z 151
1999-05-04 22:52:58 C 13 35 01.32 +00 34 38.1 z 860
1999-05-04 22:59:12 C 13 35 00.95 +00 34 41.3 z 860
1999-05-04 23:06:11 C 13 35 00.45 +00 34 45.9 z 860
1999-05-06 07:37:55 C 13 32 57.37 +00 53 52.6 z 711
1999-05-06 15:40:45 C 13 32 27.34 +00 58 36.2 360
1999-05-06 15:44:29 C 13 32 27.10 +00 58 38.3 360
1999-05-06 15:47:45 C 13 32 26.88 +00 58 40.1 360
1999-05-06 21:10:28 C 13 32 07.27 +01 01 45.2 z 151
1999-05-06 21:16:42 C 13 32 06.92 +01 01 49.7 z 151
1999-05-06 21:22:31 C 13 32 06.51 +01 01 53.2 z 151
1999-05-06 21:26:59 C 13 32 06.22 +01 01 55.9 z 151
1999-05-06 21:34:12 C 13 32 05.85 +01 02 00.0 z 151
1999-05-06 21:41:28 C 13 32 05.38 +01 02 04.5 z 151
1999-05-07 06:21:57 C 13 31 32.79 +01 07 10.4 z 711
1999-05-07 06:27:14 C 13 31 32.45 +01 07 13.5 z 711
1999-05-07 21:49:26 C 13 30 35.70 +01 16 03.5 d 046
1999-05-07 21:51:12 C 13 30 35.54 +01 16 04.6 d 046
1999-05-07 21:52:39 C 13 30 35.45 +01 16 05.4 d 046
1999-05-07 21:55:09 C 13 30 35.33 +01 16 06.8 d 046
1999-05-08 04:59:35 c 13 30 09.46 +01 20 13.5 d 703
1999-05-08 05:18:28 c 13 30 08.18 +01 20 23.4 d 703
1999-05-08 05:37:20 c 13 30 07.01 +01 20 34.6 d 703
1999-05-08 05:56:17 c 13 30 05.80 +01 20 44.9 d 703
1999-05-08 14:23:23 C 13 29 34.48 +01 25 31.6 z 352
1999-05-08 14:29:23 C 13 29 34.08 +01 25 34.8 z 352
1999-05-08 14:35:24 C 13 29 33.71 +01 25 38.4 z 352
1999-05-09 04:26:17 c 13 28 43.64 +01 33 28.8 d 703
1999-05-09 04:38:53 c 13 28 42.78 +01 33 36.1 d 703
1999-05-09 04:48:38 C 13 28 42.04 +01 33 36.6 i 726
1999-05-09 04:55:25 c 13 28 41.74 +01 33 44.9 d 703
1999-05-09 04:55:57 C 13 28 41.53 +01 33 40.6 i 726
1999-05-09 05:04:20 C 13 28 40.99 +01 33 45.2 i 726
1999-05-09 05:04:56 c 13 28 41.12 +01 33 50.6 d 703
1999-05-09 20:10:14 C 13 27 46.37 +01 42 11.3 z 610
1999-05-09 20:16:22 C 13 27 46.03 +01 42 13.6 z 151
1999-05-09 20:22:35 C 13 27 45.65 +01 42 17.2 z 151
1999-05-09 20:27:30 C 13 27 45.35 +01 42 19.7 z 151
1999-05-09 20:28:00 C 13 27 45.25 +01 42 21.1 z 610
1999-05-09 20:36:47 C 13 27 44.77 +01 42 25.0 z 151