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
2020-02-14 06:24:54 C 07 59 15.14 +15 25 36.0 V G96
2020-02-24 04:35:38 C 07 50 49.14 +16 09 57.3 U I41
2020-02-24 06:48:52 C 07 50 45.00 +16 10 20.1 U I41
2020-02-25 02:26:39 C 07 50 10.46 +16 13 40.8 V G96
2020-02-25 02:34:38 C 07 50 10.23 +16 13 42.2 V G96
2020-02-25 02:42:38 C 07 50 10.00 +16 13 43.6 V G96
2020-02-25 02:50:36 C 07 50 09.76 +16 13 44.9 V G96
2020-02-25 03:36:13 C 07 50 08.39 +16 13 52.9 U I41
2020-02-25 04:59:23 C 07 50 05.90 +16 14 06.9 U I41
2020-03-24 07:05:52 C 07 41 41.245 +17 37 18.68 U F51
2020-03-24 07:23:59 C 07 41 41.289 +17 37 20.05 U F51
2020-03-24 07:42:12 C 07 41 41.331 +17 37 21.33 U F51
2020-03-24 08:00:22 C 07 41 41.387 +17 37 22.77 U F51
2020-04-19 06:14:24 C 07 51 30.082 +17 59 58.80 U F52
2020-04-19 06:33:24 C 07 51 30.583 +17 59 58.43 U F52
2020-04-19 06:52:29 C 07 51 31.059 +17 59 58.46 U F52
2020-04-19 07:11:34 C 07 51 31.551 +17 59 58.36 U F52
2021-01-17 20:33:36 C 13 49 16.80 -09 41 17.8 q D29
2021-01-17 20:53:57 C 13 49 17.85 -09 41 22.1 q D29
2021-01-17 21:14:19 C 13 49 18.90 -09 41 26.3 q D29
2021-02-06 10:57:41 C 14 11 54.45 -10 53 44.9 V 703
2021-02-06 11:13:00 C 14 11 55.16 -10 53 45.5 V 703
2021-02-06 11:20:39 C 14 11 55.50 -10 53 47.8 V 703
2021-02-07 11:29:29 C 14 12 58.31 -10 56 11.7 V 703
2021-02-07 11:37:14 C 14 12 58.73 -10 56 12.8 V 703
2021-02-07 11:44:59 C 14 12 59.05 -10 56 14.4 V 703
2021-02-07 11:52:45 C 14 12 59.32 -10 56 14.7 V 703
2021-02-09 11:13:50 C 14 15 00.16 -11 00 32.2 V G96
2021-02-09 11:23:37 C 14 15 00.57 -11 00 33.0 V G96
2021-02-09 11:30:58 C 14 15 00.87 -11 00 33.6 V G96
2021-02-11 13:53:07 C 14 17 05.63 -11 04 29.3 V T08
2021-02-11 13:55:46 C 14 17 05.81 -11 04 28.7 V T08
2021-02-11 13:59:45 C 14 17 05.97 -11 04 29.0 V T08
2021-02-11 14:07:02 C 14 17 06.23 -11 04 29.9 V T08
2021-02-13 12:46:57 C 14 18 58.39 -11 07 31.5 V T05
2021-02-13 12:49:35 C 14 18 58.53 -11 07 30.6 V T05
2021-02-13 12:53:32 C 14 18 58.60 -11 07 31.5 V T05
2021-02-13 13:01:27 C 14 18 58.90 -11 07 32.5 V T05
2021-02-15 13:26:03 C 14 20 51.36 -11 10 02.1 V T08
2021-02-15 13:28:42 C 14 20 51.31 -11 10 02.5 V T08
2021-02-15 13:32:41 C 14 20 51.48 -11 10 02.2 V T08
2021-02-15 13:57:22 C 14 20 52.46 -11 10 03.6 V T08
2021-02-17 13:46:02 C 14 22 39.34 -11 11 52.2 V T05
2021-02-17 13:49:19 C 14 22 39.37 -11 11 51.9 V T05
2021-02-17 13:57:14 C 14 22 39.67 -11 11 52.8 V T05
2021-02-17 14:09:36 C 14 22 40.11 -11 11 53.1 V T05
2021-02-22 15:09:43 C 14 26 51.145 -11 13 22.13 U F52
2021-02-22 15:19:08 C 14 26 51.437 -11 13 21.99 U F52
2021-02-22 15:28:30 C 14 26 51.715 -11 13 21.95 U F52
2021-02-22 15:37:57 C 14 26 52.015 -11 13 21.88 U F52