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
2024-12-21 09:59:51 C 05 24 56.531 +13 37 49.73 V V00
2024-12-21 10:07:55 C 05 24 56.034 +13 37 50.05 V V00
2024-12-21 10:16:00 C 05 24 55.541 +13 37 50.41 V V00
2024-12-22 08:39:32 C 05 23 35.704 +13 38 53.59 V G96
2024-12-22 08:46:55 C 05 23 35.257 +13 38 53.81 V G96
2024-12-22 08:54:18 C 05 23 34.807 +13 38 54.17 V G96
2024-12-22 09:01:40 C 05 23 34.361 +13 38 54.56 V G96
2024-12-22 09:35:52 C 05 23 32.616 +13 38 57.62 V T05
2024-12-22 10:01:35 C 05 23 31.056 +13 38 58.56 V T05
2024-12-22 10:03:32 C 05 23 30.914 +13 38 59.21 V T05
2024-12-22 10:13:06 C 05 23 30.302 +13 38 59.86 V T05
2024-12-22 10:13:46 C 05 23 30.283 +13 39 00.07 V T05
2024-12-22 10:18:45 C 05 23 29.978 +13 38 59.78 V T05
2024-12-22 10:19:24 C 05 23 29.930 +13 39 00.11 V T05
2024-12-22 11:10:32 C 05 23 26.846 +13 39 02.16 V T05
2024-12-24 07:36:19 C 05 20 52.541 +13 41 21.01 V G96
2024-12-24 07:54:36 C 05 20 51.808 +13 41 23.45 X F52
2024-12-24 07:57:06 C 05 20 51.328 +13 41 22.06 V G96
2024-12-24 08:05:10 C 05 20 50.860 +13 41 22.56 V G96
2024-12-24 08:13:15 C 05 20 50.388 +13 41 22.96 V G96
2024-12-24 08:29:44 C 05 20 49.751 +13 41 25.51 X F52
2024-12-24 08:47:27 C 05 20 48.707 +13 41 26.52 X F52
2024-12-24 10:02:26 C 05 20 44.321 +13 41 30.48 V T05
2024-12-24 10:03:29 C 05 20 44.254 +13 41 30.98 V T08
2024-12-24 10:07:00 C 05 20 44.054 +13 41 31.09 V T05
2024-12-24 10:12:39 C 05 20 43.651 +13 41 31.60 V T08
2024-12-24 10:15:13 C 05 20 43.565 +13 41 31.13 V T05
2024-12-24 10:20:12 C 05 20 43.272 +13 41 32.03 V T08
2024-12-24 11:06:12 C 05 20 40.567 +13 41 34.08 V T05
2024-12-24 11:10:04 C 05 20 40.327 +13 41 34.66 V T08
2024-12-26 09:50:43 C 05 18 05.069 +13 44 23.10 V T05
2024-12-26 09:55:39 C 05 18 04.783 +13 44 23.53 V T05
2024-12-26 10:02:59 C 05 18 04.382 +13 44 24.04 V T05
2024-12-26 10:49:39 C 05 18 01.754 +13 44 26.92 V T05
2024-12-26 12:52:32 C 05 17 55.48 +13 44 33.2 V D29
2024-12-26 13:12:52 C 05 17 54.36 +13 44 34.5 V D29
2024-12-26 13:33:11 C 05 17 53.22 +13 44 35.9 V D29
2024-12-29 09:35:37 C 05 14 19.973 +13 49 21.68 V T05
2024-12-29 09:40:10 C 05 14 19.723 +13 49 21.90 V T05
2024-12-29 09:49:20 C 05 14 19.238 +13 49 22.84 V T05
2024-12-29 10:40:14 C 05 14 16.594 +13 49 26.36 V T05
2024-12-29 21:06:42 C 05 13 45.59 +13 50 11.1 V G17
2024-12-29 21:37:48 C 05 13 44.01 +13 50 14.0 V G17
2024-12-30 07:02:04 C 05 13 16.417 +13 50 59.67 X F52
2024-12-30 07:18:35 C 05 13 15.582 +13 51 01.02 X F52
2024-12-30 07:35:07 C 05 13 14.742 +13 51 02.35 X F52
2024-12-30 09:22:19 C 05 13 09.286 +13 51 10.94 V T08
2024-12-30 10:09:09 C 05 13 06.907 +13 51 14.80 V T08
2024-12-30 10:13:17 C 05 13 06.734 +13 51 14.54 V T08
2024-12-31 03:14:19 C 05 12 17.537 +13 52 41.23 V W68