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
2021-02-23 12:55:22 C 14 27 33.37 -11 13 08.6 V T08
2021-02-23 13:00:01 C 14 27 33.52 -11 13 08.5 V T08
2021-02-23 13:13:19 C 14 27 33.95 -11 13 07.8 V T08
2021-02-23 13:47:27 C 14 27 34.98 -11 13 08.1 V T08
2021-03-07 12:36:09 C 14 35 05.32 -10 54 48.0 V T08
2021-03-07 12:42:07 C 14 35 05.44 -10 54 47.6 V T08
2021-03-07 12:59:58 C 14 35 05.76 -10 54 45.5 V T08
2021-03-07 13:11:58 C 14 35 05.98 -10 54 44.0 V T08
2021-03-09 06:40:54 C 14 35 53.10 -10 49 31.2 V W33
2021-03-09 06:51:57 C 14 35 53.28 -10 49 29.1 V W33
2021-03-09 07:02:58 C 14 35 53.47 -10 49 26.9 V W33
2021-03-13 19:46:00 C 14 37 31.10 -10 32 14.4 q D29
2021-03-13 20:06:22 C 14 37 31.32 -10 32 10.7 q D29
2021-03-13 20:26:44 C 14 37 31.51 -10 32 07.0 q D29
2021-03-15 12:07:17 C 14 37 57.92 -10 24 30.0 V T08
2021-03-15 12:12:00 C 14 37 57.96 -10 24 29.2 V T08
2021-03-15 12:36:50 C 14 37 58.14 -10 24 24.3 V T08
2021-03-15 12:48:48 C 14 37 58.23 -10 24 21.9 V T08
2021-03-15 13:10:39 C 14 37 58.403 -10 24 17.58 U F51
2021-03-15 13:26:53 C 14 37 58.527 -10 24 14.31 U F51
2021-03-15 13:43:07 C 14 37 58.650 -10 24 11.06 U F51
2021-03-15 13:59:23 C 14 37 58.770 -10 24 07.74 U F51
2021-03-18 11:06:19 C 14 38 30.79 -10 09 08.6 o 691
2021-03-18 11:22:13 C 14 38 30.84 -10 09 04.8 o 691
2021-03-18 11:36:21 C 14 38 30.90 -10 09 01.5 o 691
2021-03-19 11:57:21 C 14 38 38.41 -10 03 10.5 V T08
2021-03-19 12:02:01 C 14 38 38.43 -10 03 09.4 V T08
2021-03-19 12:08:45 C 14 38 38.42 -10 03 08.0 V T08
2021-03-19 12:38:35 C 14 38 38.48 -10 03 00.5 V T08
2021-03-22 12:20:57 C 14 38 46.765 -09 44 09.79 U F52
2021-03-22 12:38:22 C 14 38 46.715 -09 44 04.92 U F52
2021-03-22 12:55:48 C 14 38 46.666 -09 44 00.05 U F52
2021-03-22 13:13:14 C 14 38 46.615 -09 43 55.11 U F52
2021-03-23 14:32:28 C 14 38 44.56 -09 36 38.6 V T08
2021-03-23 14:43:09 C 14 38 44.52 -09 36 35.5 V T08
2021-03-23 14:47:20 C 14 38 44.51 -09 36 34.3 V T08
2021-03-23 15:09:00 C 14 38 44.40 -09 36 27.8 V T08
2021-03-23 15:35:55 C 14 38 44.30 -09 36 19.3 V T08
2021-04-01 13:41:57 C 14 36 44.35 -08 21 36.0 V T05
2021-04-01 14:21:21 C 14 36 43.57 -08 21 20.1 V T05
2021-04-01 14:26:27 C 14 36 43.48 -08 21 17.6 V T05
2021-04-02 12:12:56 C 14 36 20.65 -08 12 20.2 V T05
2021-04-02 12:17:33 C 14 36 20.54 -08 12 18.2 V T05
2021-04-02 12:28:34 C 14 36 20.31 -08 12 13.7 V T05
2021-04-02 12:47:54 C 14 36 19.90 -08 12 05.5 V T05
2021-04-04 09:47:06 C 14 35 25.17 -07 52 47.0 V 703
2021-04-04 09:54:44 C 14 35 24.98 -07 52 43.3 V 703
2021-04-04 10:05:01 C 14 35 24.74 -07 52 38.8 V 703
2021-04-04 10:05:30 C 14 35 24.72 -07 52 38.3 V G96
2021-04-04 10:12:40 C 14 35 24.53 -07 52 35.0 V 703