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
2021-05-12 10:03:01 C 13 50 00.94 +01 18 55.6 V T05
2021-05-12 10:05:40 C 13 50 00.78 +01 18 57.7 V T05
2021-05-12 10:07:39 C 13 50 00.64 +01 18 58.4 V T05
2021-05-12 10:15:37 C 13 50 00.11 +01 19 03.3 V T05
2021-05-12 10:18:15 C 13 49 59.93 +01 19 05.1 V T05
2021-05-12 10:40:44 C 13 49 58.44 +01 19 18.8 V T05
2021-05-12 20:01:34 C 13 49 23.81 +01 24 54.1 V 089
2021-05-12 20:04:53 C 13 49 23.57 +01 24 56.5 V 089
2021-05-12 20:08:13 C 13 49 23.33 +01 24 58.1 V 089
2021-05-12 20:11:33 C 13 49 23.15 +01 25 00.2 V 089
2021-05-12 20:14:54 C 13 49 22.93 +01 25 02.4 V 089
2021-05-12 20:18:13 C 13 49 22.70 +01 25 04.5 V 089
2021-05-12 20:21:33 C 13 49 22.48 +01 25 06.7 V 089
2021-05-12 20:24:53 C 13 49 22.25 +01 25 08.3 V 089
2021-05-12 20:28:14 C 13 49 22.04 +01 25 10.2 V 089
2021-05-12 20:31:33 C 13 49 21.81 +01 25 12.4 V 089
2021-05-13 12:10:58 C 13 48 23.928 +01 34 56.10 V P07
2021-05-13 12:57:35 C 13 48 20.866 +01 35 23.89 V P07
2021-05-13 12:59:29 C 13 48 20.738 +01 35 25.12 V P07
2021-05-13 14:00:47 C 13 48 16.694 +01 36 01.98 V P07
2021-05-13 14:02:53 C 13 48 16.555 +01 36 03.24 V P07
2021-05-13 16:26:37 C 13 48 07.022 +01 37 29.10 V P07
2021-05-13 16:34:12 C 13 48 07.24 +01 37 17.4 V 186
2021-05-13 16:39:20 C 13 48 06.89 +01 37 20.7 V 186
2021-05-13 17:45:42 C 13 48 01.858 +01 38 16.01 V P07
2021-05-13 20:42:05 C 13 47 51.11 +01 39 45.1 V 186
2021-05-13 20:47:15 C 13 47 50.76 +01 39 48.5 V 186
2021-05-14 08:53:37 C 13 47 06.38 +01 47 03.0 V T08
2021-05-14 08:58:16 C 13 47 06.08 +01 47 05.7 V T08
2021-05-14 09:06:56 C 13 47 05.50 +01 47 10.9 V T08
2021-05-14 09:47:56 C 13 47 02.80 +01 47 34.9 V T08
2021-05-14 16:46:58 C 13 46 37.56 +01 51 35.8 V 186
2021-05-14 16:52:08 C 13 46 37.24 +01 51 38.8 V 186
2021-05-14 20:42:12 C 13 46 22.41 +01 53 52.7 V 186
2021-05-14 20:47:22 C 13 46 22.05 +01 53 55.9 V 186
2021-05-15 02:43:53 C 13 46 01.07 +01 57 23.9 V W46
2021-05-15 02:54:59 C 13 46 00.31 +01 57 30.4 V W46
2021-05-15 03:02:32 C 13 45 59.82 +01 57 35.0 V W46
2021-05-15 11:24:27 C 13 45 29.942 +02 02 38.76 V P07
2021-05-15 13:06:25 C 13 45 23.378 +02 03 37.87 V P07
2021-05-15 13:55:08 C 13 45 20.227 +02 04 06.13 V P07
2021-05-15 13:56:06 C 13 45 20.167 +02 04 06.56 V P07
2021-05-15 16:07:16 C 13 45 11.659 +02 05 21.73 V P07
2021-05-15 16:08:08 C 13 45 11.604 +02 05 21.80 V P07
2021-05-15 16:58:27 C 13 45 08.364 +02 05 50.68 V P07
2021-05-15 19:46:21 C 13 44 58.85 +02 07 08.7 V 089
2021-05-15 19:49:41 C 13 44 58.63 +02 07 10.7 V 089
2021-05-15 19:53:01 C 13 44 58.41 +02 07 12.6 V 089
2021-05-15 19:56:21 C 13 44 58.22 +02 07 14.6 V 089
2021-05-15 19:59:40 C 13 44 57.99 +02 07 16.9 V 089