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
2010-04-24 02:23:06 C 14 07 57.58 -03 03 23.2 c 844
2010-04-24 02:50:24 C 14 07 55.93 -03 03 05.9 c 844
2010-04-25 00:23:17 C 14 06 41.32 -02 49 27.8 19.8 u C20
2010-04-25 00:25:24 C 14 06 41.24 -02 49 26.8 19.8 u C20
2010-04-25 22:35:55 C 14 05 24.35 -02 35 06.2 16.2 u 084
2010-04-25 22:41:06 C 14 05 24.02 -02 35 02.8 16.5 u 084
2010-04-26 22:28:12 C 14 03 59.84 -02 19 32.7 16.6 u 084
2010-04-26 22:33:23 C 14 03 59.55 -02 19 29.6 16.2 u 084
2010-04-28 22:38:21 C 14 01 05.68 -01 48 01.4 16.9 u 084
2010-04-28 22:40:38 C 14 01 05.28 -01 47 57.7 u C20
2010-04-28 22:44:52 C 14 01 05.03 -01 47 54.7 15.1 u C20
2010-04-29 23:46:48 C 13 59 32.69 -01 31 29.6 16.7 u C20
2010-04-29 23:51:02 C 13 59 32.43 -01 31 26.9 16.6 u C20
2010-05-01 13:04:28 C 13 57 14.58 -01 07 01.6 r D29
2010-05-01 13:22:09 C 13 57 13.45 -01 06 49.9 r D29
2010-05-01 13:40:20 C 13 57 12.26 -01 06 38.2 r D29
2010-05-01 13:57:23 C 13 57 11.11 -01 06 27.0 r D29
2010-05-01 22:29:48 C 13 56 38.57 -01 00 56.4 16.7 o 084
2010-05-01 22:31:57 C 13 56 38.45 -01 00 54.8 16.6 o 084
2010-05-02 22:16:53 C 13 55 08.77 -00 45 25.2 16.7 o 084
2010-05-02 22:19:04 C 13 55 08.62 -00 45 24.0 16.8 o 084
2010-05-04 21:28:45 C 13 52 09.87 -00 14 49.2 r J75
2010-05-04 21:47:17 C 13 52 08.63 -00 14 37.5 r J75
2010-05-04 22:05:52 C 13 52 07.36 -00 14 25.2 r J75
2010-05-05 22:25:03 C 13 50 34.69 +00 01 11.2 w J51
2010-05-05 22:34:43 C 13 50 34.06 +00 01 17.2 w J51
2010-05-05 22:44:22 C 13 50 33.41 +00 01 23.5 w J51
2010-05-06 06:31:58 C 13 50 03.33 +00 06 20.5 r 703
2010-05-06 06:40:58 C 13 50 02.72 +00 06 26.2 r 703
2010-05-06 06:50:04 C 13 50 02.11 +00 06 31.8 r 703
2010-05-06 06:59:06 C 13 50 01.50 +00 06 37.5 r 703
2010-05-08 07:06:04 C 13 46 58.00 +00 36 51.6 16.5 c 704
2010-05-08 07:20:52 C 13 46 57.02 +00 37 00.7 16.5 c 704
2010-05-08 07:35:25 C 13 46 56.04 +00 37 09.8 16.5 c 704
2010-05-08 07:50:17 C 13 46 55.06 +00 37 19.0 16.4 c 704
2010-05-08 08:04:50 C 13 46 54.09 +00 37 27.9 16.4 c 704
2010-05-10 03:24:07 C 13 44 10.78 +01 04 01.3 u H23
2010-05-10 03:39:44 C 13 44 09.74 +01 04 10.8 u H23
2010-05-10 03:55:22 C 13 44 08.71 +01 04 20.3 u H23
2010-05-14 21:30:37 C 13 37 11.27 +02 09 48.6 16.5 o 084
2010-05-14 21:32:47 C 13 37 11.13 +02 09 49.4 16.6 o 084
2010-05-19 21:52:18 C 13 30 23.31 +03 11 13.1 17.3 u 084
2010-05-20 06:24:48 C 13 29 56.07 +03 15 17.6 r 703
2010-05-20 06:36:23 C 13 29 55.42 +03 15 23.1 r 703
2010-05-20 06:48:02 C 13 29 54.78 +03 15 28.3 r 703
2010-05-20 06:59:36 C 13 29 54.13 +03 15 33.7 r 703
2010-05-21 22:22:12 C 13 27 52.85 +03 33 14.9 w A06
2010-05-21 22:28:24 C 13 27 52.50 +03 33 17.8 w A06
2010-05-21 22:36:08 C 13 27 52.10 +03 33 21.2 w A06
2010-05-26 04:52:07 C 13 23 06.38 +04 14 02.9 o H10