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
2012-05-22 03:45:05 C 09 04 05.23 +15 27 59.8 r G96
2012-05-22 03:53:27 C 09 04 05.52 +15 27 58.9 r G96
2012-05-22 04:01:49 C 09 04 05.80 +15 27 57.9 r G96
2013-10-15 18:09:25 C 06 27 48.19 +15 49 40.3 q D29
2013-10-15 18:35:11 C 06 27 48.46 +15 49 35.6 q D29
2013-10-15 19:00:58 C 06 27 48.70 +15 49 31.3 q D29
2013-11-01 09:09:02 C 06 26 04.69 +14 43 19.9 q H45
2013-11-01 09:11:06 C 06 26 04.65 +14 43 19.5 q H45
2013-11-01 09:12:54 C 06 26 04.62 +14 43 19.4 q H45
2013-11-01 09:15:27 C 06 26 04.55 +14 43 19.2 q H45
2013-11-01 09:17:20 C 06 26 04.52 +14 43 18.8 q H45
2013-11-01 09:19:12 C 06 26 04.49 +14 43 18.7 q H45
2013-11-07 02:48:40 C 06 22 27.76 +14 24 00.0 c A24
2013-11-07 02:50:46 C 06 22 27.69 +14 23 59.4 c A24
2013-11-07 03:09:08 C 06 22 27.07 +14 23 57.2 c A24
2013-11-07 03:30:48 C 06 22 26.42 +14 23 54.3 c A24
2013-11-07 03:48:30 C 06 22 25.81 +14 23 52.4 c A24
2013-11-07 03:50:35 C 06 22 25.79 +14 23 51.1 c A24
2013-11-10 09:02:33 C 06 19 44.11 +14 14 08.4 o 926
2013-11-10 09:31:37 C 06 19 42.96 +14 14 05.1 o 926
2013-11-10 09:52:06 C 06 19 42.16 +14 14 02.4 o 926
2013-11-13 03:34:45 C 06 17 02.52 +14 06 22.3 c A24
2013-11-13 03:36:50 C 06 17 02.43 +14 06 22.1 c A24
2013-11-13 03:54:45 C 06 17 01.63 +14 06 20.1 c A24
2013-11-13 04:15:17 C 06 17 00.73 +14 06 17.6 c A24
2013-11-13 04:33:13 C 06 16 59.95 +14 06 15.6 c A24
2013-11-13 04:35:17 C 06 16 59.83 +14 06 15.5 c A24
2013-11-24 09:26:15 C 06 03 06.07 +13 41 55.5 u H21
2013-11-24 09:30:29 C 06 03 05.79 +13 41 55.1 u H21
2013-11-24 09:34:52 C 06 03 05.52 +13 41 54.8 u H21
2013-11-24 09:39:15 C 06 03 05.26 +13 41 54.5 u H21
2013-11-24 09:43:30 C 06 03 04.99 +13 41 54.2 u H21
2013-11-27 03:11:27 C 05 59 06.00 +13 37 44.2 t 130
2013-11-27 03:12:54 C 05 59 05.91 +13 37 44.4 t 130
2013-11-27 03:14:20 C 05 59 05.76 +13 37 44.8 t 130
2013-11-27 03:16:30 C 05 59 05.65 +13 37 44.1 t 130
2013-12-13 07:46:29 C 05 33 26.79 +13 28 32.7 u G32
2013-12-13 07:52:45 C 05 33 26.35 +13 28 32.8 u G32
2013-12-13 07:59:04 C 05 33 25.90 +13 28 32.7 u G32
2013-12-13 08:05:22 C 05 33 25.51 +13 28 32.6 u G32
2013-12-23 05:43:37 C 05 18 38.73 +13 35 35.3 q 703
2013-12-23 05:50:52 C 05 18 38.46 +13 35 35.3 q 703
2013-12-23 05:58:07 C 05 18 37.89 +13 35 36.3 q 703
2013-12-26 05:46:35 C 05 14 37.98 +13 39 36.8 q G96
2013-12-26 05:58:50 C 05 14 37.30 +13 39 37.7 q G96
2013-12-26 06:11:04 C 05 14 36.61 +13 39 38.3 q G96
2013-12-26 06:23:20 C 05 14 35.93 +13 39 39.3 q G96
2013-12-26 14:32:56 C 05 14 09.79 +13 40 09.7 q D29
2014-01-21 04:24:44 C 04 53 28.87 +14 44 37.4 q 703
2014-01-21 04:33:32 C 04 53 28.72 +14 44 37.6 q 703