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
2021-11-27 20:26:51 C 00 32 15.56 -06 25 32.4 V 511
2021-11-28 08:15:28 C 00 33 20.29 -06 16 46.6 V T05
2021-11-28 08:19:28 C 00 33 20.66 -06 16 43.7 V T05
2021-11-28 08:32:02 C 00 33 21.77 -06 16 34.4 V T05
2021-11-28 08:49:20 C 00 33 23.29 -06 16 21.6 V T05
2021-11-29 04:22:23 C 00 35 10.23 -06 02 05.7 V 703
2021-11-29 04:29:56 C 00 35 10.92 -06 02 00.1 V 703
2021-11-29 04:37:30 C 00 35 11.58 -06 01 54.8 V 703
2021-11-29 04:45:03 C 00 35 12.22 -06 01 49.4 V 703
2021-12-02 04:05:06 C 00 41 33.15 -05 10 29.9 V 703
2021-12-02 04:12:37 C 00 41 33.79 -05 10 24.3 V 703
2021-12-02 04:20:08 C 00 41 34.43 -05 10 19.1 V 703
2021-12-02 04:27:40 C 00 41 35.06 -05 10 13.9 V 703
2021-12-05 04:34:03 C 00 47 48.27 -04 19 38.9 V 703
2021-12-05 04:42:18 C 00 47 48.95 -04 19 33.1 V 703
2021-12-05 04:50:34 C 00 47 49.63 -04 19 27.6 V 703
2021-12-05 04:58:49 C 00 47 50.30 -04 19 21.7 V 703
2021-12-09 03:38:48 C 00 55 45.76 -03 14 47.1 V 703
2021-12-09 03:47:01 C 00 55 46.44 -03 14 41.6 V 703
2021-12-09 03:55:14 C 00 55 47.08 -03 14 36.2 V 703
2021-12-09 04:03:28 C 00 55 47.74 -03 14 30.4 V 703
2021-12-10 14:47:41 S 00 58 38.68 -02 51 13.5 L C51
2021-12-10 21:04:08 S 00 59 09.40 -02 47 03.9 L C51
2021-12-11 00:12:16 S 00 59 24.67 -02 44 59.6 L C51
2021-12-11 03:19:41 S 00 59 39.89 -02 42 55.3 L C51
2021-12-11 06:28:43 S 00 59 55.23 -02 40 50.4 L C51
2021-12-11 08:02:48 S 01 00 02.87 -02 39 48.3 L C51
2021-12-11 09:36:51 S 01 00 10.47 -02 38 45.4 L C51
2021-12-11 11:10:55 S 01 00 18.10 -02 37 43.7 L C51
2021-12-11 12:45:00 S 01 00 25.81 -02 36 42.5 L C51
2021-12-11 14:19:03 S 01 00 33.36 -02 35 39.3 L C51
2021-12-11 15:53:08 S 01 00 40.96 -02 34 37.8 L C51
2021-12-11 17:27:11 S 01 00 48.67 -02 33 35.7 L C51
2021-12-16 05:38:44 S 01 09 26.73 -01 23 35.5 L C51
2021-12-16 08:46:52 S 01 09 41.52 -01 21 34.8 L C51
2021-12-16 11:55:00 S 01 09 56.316 -01 19 35.51 L C51
2021-12-16 15:03:09 S 01 10 11.02 -01 17 36.6 L C51
2021-12-16 15:03:20 S 01 10 11.11 -01 17 36.1 L C51
2021-12-16 22:53:40 S 01 10 48.07 -01 12 38.2 L C51
2021-12-17 00:27:44 S 01 10 55.50 -01 11 35.4 L C51
2021-12-17 02:01:48 S 01 11 02.753 -01 10 38.78 L C51
2021-12-17 06:44:11 S 01 11 24.95 -01 07 41.0 L C51
2021-12-17 08:18:15 S 01 11 32.31 -01 06 42.1 L C51
2021-12-17 09:52:19 S 01 11 39.75 -01 05 42.2 L C51
2021-12-17 11:26:23 S 01 11 47.10 -01 04 44.1 L C51
2021-12-17 17:42:39 S 01 12 16.48 -01 00 46.8 L C51
2021-12-17 20:50:58 S 01 12 31.22 -00 58 48.1 L C51
2021-12-17 23:59:06 S 01 12 45.97 -00 56 49.0 L C51
2021-12-18 03:07:14 S 01 13 00.59 -00 54 50.8 L C51
2021-12-18 06:15:22 S 01 13 15.31 -00 52 53.2 L C51