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
2025-01-23 08:19:42 C 04 55 54.367 +14 56 31.49 V T08
2025-01-23 08:23:42 C 04 55 54.331 +14 56 32.86 V T08
2025-01-23 08:33:16 C 04 55 54.149 +14 56 33.14 V T08
2025-01-23 08:50:00 C 04 55 54.002 +14 56 35.59 V T08
2025-02-18 04:00:04 C 04 59 49.103 +16 32 24.86 V G96
2025-02-18 04:07:31 C 04 59 49.261 +16 32 25.91 V G96
2025-02-18 04:16:41 C 04 59 49.448 +16 32 27.74 V G96
2025-02-18 04:24:10 C 04 59 49.610 +16 32 28.64 V G96
2025-11-29 14:41:13 C 10 50 43.696 +04 47 19.33 X F52
2025-11-29 14:57:13 C 10 50 44.094 +04 47 16.69 X F52
2025-11-29 15:13:17 C 10 50 44.527 +04 47 13.99 X F52
2025-11-30 14:49:33 C 10 51 21.282 +04 43 27.00 X F52
2025-11-30 14:57:00 C 10 51 21.463 +04 43 25.85 X F52
2025-11-30 15:04:35 C 10 51 21.653 +04 43 24.62 X F52
2025-11-30 21:04:55 C 10 51 30.891 +04 42 26.93 W O18
2025-11-30 22:49:54 C 10 51 33.496 +04 42 10.21 W O18
2025-12-01 20:53:35 C 10 52 06.832 +04 38 44.53 W O18
2025-12-01 22:38:36 C 10 52 09.349 +04 38 28.35 W O18
2025-12-03 20:48:58 C 10 53 16.370 +04 31 33.71 W O18
2025-12-03 22:34:05 C 10 53 18.739 +04 31 18.29 W O18
2025-12-07 21:03:15 C 10 55 24.171 +04 18 18.77 W O18
2025-12-07 22:48:00 C 10 55 26.281 +04 18 05.24 W O18
2025-12-15 22:08:34 C 10 58 49.431 +03 56 59.08 W O18
2025-12-15 23:08:31 C 10 58 50.239 +03 56 53.54 W O18
2025-12-20 21:22:38 C 11 00 18.664 +03 47 45.56 W O18
2025-12-20 22:57:52 C 11 00 19.569 +03 47 39.61 W O18
2025-12-23 21:25:18 C 11 00 57.495 +03 43 48.39 W O18
2025-12-23 23:16:49 C 11 00 58.240 +03 43 43.39 W O18
2025-12-25 14:45:35 C 11 01 14.393 +03 42 08.20 X F51
2025-12-25 15:02:04 C 11 01 14.473 +03 42 07.64 X F51
2025-12-25 15:17:31 C 11 01 14.553 +03 42 07.01 X F51
2025-12-25 15:32:57 C 11 01 14.632 +03 42 06.49 X F51
2025-12-27 20:59:30 C 11 01 30.565 +03 40 33.89 W O18
2025-12-27 23:06:27 C 11 01 30.942 +03 40 31.22 W O18
2025-12-28 21:06:17 C 11 01 35.458 +03 40 07.40 W O18
2025-12-28 22:56:51 C 11 01 35.691 +03 40 05.75 W O18
2025-12-30 21:02:33 C 11 01 41.025 +03 39 42.41 W O18
2025-12-30 22:59:06 C 11 01 41.027 +03 39 42.14 W O18
2026-01-01 21:04:47 C 11 01 40.859 +03 39 55.09 W O18
2026-01-01 22:46:47 C 11 01 40.661 +03 39 56.24 W O18
2026-01-02 22:26:11 C 11 01 38.372 +03 40 17.51 W O18
2026-01-02 23:15:00 C 11 01 38.219 +03 40 18.18 W O18
2026-01-09 20:23:40 C 11 00 41.144 +03 47 20.66 W O18
2026-01-09 22:37:45 C 11 00 39.757 +03 47 29.75 W O18
2026-01-10 20:10:45 C 11 00 26.888 +03 49 02.18 W O18
2026-01-10 22:46:18 C 11 00 25.099 +03 49 13.90 W O18
2026-01-11 19:14:13 C 11 00 11.621 +03 50 50.73 W O18
2026-01-11 20:06:27 C 11 00 10.973 +03 50 54.89 W O18