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
2010-10-08 02:55:09 C 20 20 20.72 -24 29 55.8 15.9 c 704
2010-10-08 03:14:50 C 20 20 27.46 -24 29 50.3 17.0 c 704
2010-10-11 02:39:42 C 20 45 13.96 -24 00 33.8 r 703
2010-10-11 02:47:11 C 20 45 16.45 -24 00 30.3 r 703
2010-10-11 02:54:35 C 20 45 18.90 -24 00 26.2 r 703
2010-10-11 03:02:03 C 20 45 21.34 -24 00 22.5 r 703
2010-10-13 01:51:35 C 21 00 46.21 -23 32 52.2 834
2010-10-13 02:19:08 C 21 00 54.92 -23 32 34.0 834
2010-10-13 02:42:27 C 21 01 02.29 -23 32 18.6 834
2010-10-28 03:17:18 C 22 35 33.36 -18 16 31.6 16.0 c 704
2010-10-28 03:35:39 C 22 35 37.05 -18 16 13.5 16.0 c 704
2010-10-28 03:53:50 C 22 35 40.70 -18 15 55.5 16.2 c 704
2010-10-28 04:12:02 C 22 35 44.35 -18 15 37.6 16.1 c 704
2010-10-28 04:30:16 C 22 35 48.02 -18 15 19.6 15.9 c 704
2010-10-30 02:29:04 C 22 45 01.40 -17 30 03.9 r 703
2010-10-30 02:39:00 C 22 45 03.31 -17 29 54.2 r 703
2010-10-30 02:48:52 C 22 45 05.18 -17 29 44.8 r 703
2010-10-30 02:58:43 C 22 45 07.05 -17 29 33.8 r 703
2010-11-06 09:46:52 C 23 15 44.71 -14 40 11.2 u 379
2010-11-06 09:49:33 C 23 15 45.12 -14 40 08.9 u 379
2010-11-06 10:16:20 C 23 15 49.20 -14 39 43.6 u 379
2010-11-06 10:19:01 C 23 15 49.61 -14 39 41.0 u 379
2010-11-06 10:36:13 C 23 15 52.26 -14 39 25.0 u 379
2010-11-06 10:38:54 C 23 15 52.66 -14 39 22.3 u 379
2010-11-10 03:14:05 C 23 29 13.16 -13 16 36.1 r 703
2010-11-10 03:25:36 C 23 29 14.78 -13 16 25.5 r 703
2010-11-10 03:37:08 C 23 29 16.36 -13 16 14.9 r 703
2010-11-10 03:48:47 C 23 29 17.98 -13 16 04.2 r 703
2010-12-04 03:46:36 C 00 35 05.40 -05 23 00.4 17.0 c 704
2010-12-04 04:05:38 C 00 35 07.13 -05 22 46.2 17.6 c 704
2010-12-04 04:24:40 C 00 35 08.86 -05 22 32.2 17.7 c 704
2010-12-04 04:43:49 C 00 35 10.63 -05 22 18.8 17.2 c 704
2010-12-04 05:03:04 C 00 35 12.42 -05 22 04.2 17.2 c 704
2010-12-08 03:10:38 C 00 43 54.33 -04 14 17.0 17.6 c 704
2010-12-08 03:30:02 C 00 43 56.05 -04 14 03.2 17.8 c 704
2010-12-08 03:49:32 C 00 43 57.78 -04 13 49.6 17.8 c 704
2010-12-08 04:08:55 C 00 43 59.49 -04 13 35.3 17.8 c 704
2010-12-08 04:28:14 C 00 44 01.18 -04 13 22.1 17.6 c 704
2010-12-09 02:50:32 C 00 46 02.45 -03 57 35.8 G92
2010-12-09 03:10:59 C 00 46 04.29 -03 57 21.2 G92
2010-12-09 03:31:23 C 00 46 06.03 -03 57 06.8 G92
2010-12-29 01:45:13 C 01 26 08.12 +01 13 29.1 r 703
2010-12-29 01:53:20 C 01 26 08.77 +01 13 33.4 r 703
2010-12-29 02:01:33 C 01 26 09.38 +01 13 38.6 r 703
2010-12-29 02:09:44 C 01 26 10.06 +01 13 43.4 r 703
2011-01-07 03:10:34 C 01 43 08.63 +03 20 00.5 19.0 c 704
2011-01-07 03:30:54 C 01 43 10.27 +03 20 13.7 18.9 c 704
2011-01-07 03:50:49 C 01 43 11.82 +03 20 24.9 19.5 c 704
2011-01-07 04:11:38 C 01 43 13.35 +03 20 36.4 19.0 c 704
2011-01-07 21:46:45 C 01 44 34.91 +03 30 29.8 w J24