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
2021-10-24 01:01:20 C 22 40 11.83 -18 41 21.1 q Y00
2021-10-24 01:05:28 C 22 40 12.67 -18 41 17.0 q Y00
2021-10-24 07:21:01 C 22 41 32.16 -18 35 14.8 V T08
2021-10-24 07:25:40 C 22 41 33.09 -18 35 10.1 V T08
2021-10-24 07:34:18 C 22 41 34.83 -18 35 01.2 V T08
2021-10-24 07:48:54 C 22 41 37.77 -18 34 46.4 V T08
2021-10-26 03:54:27 C 22 50 34.25 -17 50 18.0 V 703
2021-10-26 04:02:41 C 22 50 35.81 -17 50 09.7 V 703
2021-10-26 04:10:55 C 22 50 37.38 -17 50 01.3 V 703
2021-10-26 04:19:09 C 22 50 38.95 -17 49 53.3 V 703
2021-10-26 07:30:10 C 22 51 16.26 -17 46 37.2 V T05
2021-10-26 07:34:46 C 22 51 17.12 -17 46 32.6 V T05
2021-10-26 07:39:23 C 22 51 17.99 -17 46 27.8 V T05
2021-10-26 07:45:59 C 22 51 19.23 -17 46 21.1 V T05
2021-10-26 18:43:01 C 22 53 27.16 -17 35 27.7 V K74
2021-10-26 18:45:16 C 22 53 27.60 -17 35 25.6 V K74
2021-10-26 18:47:28 C 22 53 28.00 -17 35 23.3 V K74
2021-10-26 18:49:43 C 22 53 28.43 -17 35 21.2 V K74
2021-10-26 18:51:55 C 22 53 28.85 -17 35 19.0 V K74
2021-10-26 18:54:07 C 22 53 29.24 -17 35 16.8 V K74
2021-10-26 20:35:57 C 22 53 48.44 -17 33 33.0 q 006
2021-10-26 20:38:12 C 22 53 48.87 -17 33 30.7 q 006
2021-10-26 20:40:28 C 22 53 49.31 -17 33 28.6 q 006
2021-10-26 20:42:44 C 22 53 49.70 -17 33 26.2 q 006
2021-10-26 20:44:26 C 22 53 50.05 -17 33 24.7 q 006
2021-10-26 20:46:08 C 22 53 50.35 -17 33 23.0 q 006
2021-10-26 20:50:43 C 22 53 51.18 -17 33 18.1 q 006
2021-10-26 20:52:59 C 22 53 51.61 -17 33 16.0 q 006
2021-10-28 08:20:46 C 23 00 28.99 -16 57 40.8 V T08
2021-10-28 08:25:25 C 23 00 29.81 -16 57 36.0 V T08
2021-10-28 08:34:42 C 23 00 31.44 -16 57 26.7 V T08
2021-10-28 08:55:56 C 23 00 35.18 -16 57 05.3 V T08
2021-10-29 04:13:27 C 23 04 04.05 -16 38 00.6 V 703
2021-10-29 04:21:06 C 23 04 05.37 -16 37 53.1 V 703
2021-10-29 04:28:47 C 23 04 06.68 -16 37 45.4 V 703
2021-10-29 04:36:27 C 23 04 08.00 -16 37 37.8 V 703
2021-10-30 06:19:16 C 23 08 36.72 -16 12 16.7 V U68
2021-10-30 06:24:54 C 23 08 37.65 -16 12 11.1 V U68
2021-10-30 06:52:40 C 23 08 42.31 -16 11 43.9 V U68
2021-10-30 06:58:18 C 23 08 43.24 -16 11 38.2 V U68
2021-10-30 09:21:19 C 23 09 07.54 -16 09 12.4 V T05
2021-10-30 09:27:14 C 23 09 08.51 -16 09 06.7 V T05
2021-10-30 09:35:11 C 23 09 09.83 -16 08 58.7 V T05
2021-10-30 09:53:44 C 23 09 12.91 -16 08 40.2 V T05
2021-10-31 07:36:21 C 23 12 52.78 -15 47 28.2 V T05
2021-10-31 07:42:18 C 23 12 53.74 -15 47 22.5 V T05
2021-10-31 07:51:34 C 23 12 55.21 -15 47 13.3 V T05
2021-10-31 08:10:04 C 23 12 58.16 -15 46 55.3 V T05
2021-11-01 03:52:54 C 23 16 12.15 -15 27 51.0 V G96
2021-11-01 03:59:52 C 23 16 13.24 -15 27 44.3 V G96