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
2021-05-30 13:53:21 C 13 27 02.599 +04 46 37.49 V P07
2021-05-30 14:58:22 C 13 26 59.822 +04 46 57.79 V P07
2021-05-30 16:09:50 C 13 26 56.827 +04 47 20.00 V P07
2021-05-30 19:18:04 C 13 26 50.19 +04 48 00.7 V C40
2021-05-30 19:33:43 C 13 26 49.55 +04 48 05.6 V C40
2021-05-30 19:49:22 C 13 26 48.90 +04 48 10.5 V C40
2021-05-30 19:59:49 C 13 26 48.47 +04 48 13.7 V C40
2021-05-30 20:08:30 C 13 26 48.12 +04 48 16.4 V C40
2021-05-30 20:21:54 C 13 26 47.59 +04 48 20.6 V C40
2021-05-31 02:05:15 C 13 26 35.14 +04 50 08.5 V W46
2021-05-31 02:23:53 C 13 26 34.37 +04 50 14.1 V W46
2021-05-31 02:46:12 C 13 26 33.43 +04 50 20.7 V W46
2021-05-31 07:23:27 C 13 26 22.63 +04 51 45.2 V 703
2021-05-31 07:31:21 C 13 26 22.29 +04 51 47.3 V 703
2021-05-31 07:39:16 C 13 26 21.97 +04 51 49.7 V 703
2021-05-31 07:47:11 C 13 26 21.68 +04 51 52.4 V 703
2021-06-01 09:46:11 C 13 25 26.10 +04 59 27.9 V T05
2021-06-01 09:51:28 C 13 25 25.90 +04 59 29.4 V T05
2021-06-01 09:59:22 C 13 25 25.60 +04 59 31.5 V T05
2021-06-01 10:22:01 C 13 25 24.74 +04 59 37.8 V T05
2021-06-03 09:03:49 C 13 23 53.81 +05 11 46.6 V T08
2021-06-03 09:54:45 C 13 23 52.07 +05 11 58.6 V T08
2021-06-03 10:02:43 C 13 23 51.80 +05 12 00.5 V T08
2021-06-03 10:10:01 C 13 23 51.56 +05 12 02.1 V T08
2021-06-03 22:09:48 C 13 23 30.29 +05 14 45.9 V L92
2021-06-03 22:24:43 C 13 23 29.85 +05 14 50.1 V L92
2021-06-03 22:40:39 C 13 23 29.31 +05 14 53.6 V L92
2021-06-04 10:35:07 C 13 23 09.03 +05 17 55.7 q E89
2021-06-04 10:54:04 C 13 23 08.42 +05 17 59.6 q E89
2021-06-04 11:04:03 C 13 23 08.11 +05 18 01.4 q E89
2021-06-05 08:04:52 C 13 22 33.96 +05 22 11.1 V T05
2021-06-05 08:09:29 C 13 22 33.82 +05 22 12.0 V T05
2021-06-05 08:17:25 C 13 22 33.57 +05 22 13.5 V T05
2021-06-05 08:32:44 C 13 22 33.10 +05 22 16.7 V T05
2021-06-05 16:52:12 C 13 22 20.47 +05 23 50.5 V 186
2021-06-05 16:57:20 C 13 22 20.30 +05 23 51.8 V 186
2021-06-05 20:28:58 C 13 22 14.40 +05 24 32.0 V 186
2021-06-05 20:34:09 C 13 22 14.18 +05 24 34.1 V 186
2021-06-06 06:09:09 C 13 22 00.28 +05 26 23.2 V 703
2021-06-06 06:16:42 C 13 22 00.07 +05 26 24.6 V 703
2021-06-06 06:24:15 C 13 21 59.87 +05 26 26.1 V 703
2021-06-06 06:31:48 C 13 21 59.66 +05 26 27.4 V 703
2021-06-06 17:04:04 C 13 21 45.04 +05 28 19.4 V 186
2021-06-06 17:08:41 C 13 21 44.92 +05 28 20.3 V 186
2021-06-06 20:04:14 C 13 21 40.34 +05 28 50.2 V 186
2021-06-06 20:09:24 C 13 21 40.18 +05 28 51.0 V 186
2021-06-06 21:19:42 C 13 21 38.99 +05 29 00.8 X G02
2021-06-06 21:25:43 C 13 21 38.88 +05 29 02.2 X G02
2021-06-06 21:31:45 C 13 21 38.74 +05 29 03.6 X G02
2021-06-06 21:48:04 C 13 21 38.09 +05 29 06.6 V C40