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
2024-11-22 11:00:18 C 06 09 21.650 +13 47 09.82 V G96
2024-11-22 11:03:48 C 06 09 21.847 +13 47 11.29 V T05
2024-11-22 11:07:38 C 06 09 21.226 +13 47 09.24 V G96
2024-11-22 11:14:19 C 06 09 21.197 +13 47 10.72 V T05
2024-11-22 11:14:57 C 06 09 20.804 +13 47 08.74 V G96
2024-11-22 23:56:46 C 06 08 38.047 +13 46 22.62 V M22
2024-11-23 00:36:25 C 06 08 35.729 +13 46 19.45 V M22
2024-11-23 00:49:33 C 06 08 34.975 +13 46 19.02 V M22
2024-11-23 00:54:08 C 06 08 34.690 +13 46 18.41 V M22
2024-11-24 10:46:16 C 06 06 37.610 +13 43 54.66 V T08
2024-11-24 10:50:26 C 06 06 37.354 +13 43 54.19 V T08
2024-11-24 10:54:29 C 06 06 37.111 +13 43 53.94 V T08
2024-11-24 11:45:13 C 06 06 34.008 +13 43 50.84 V T08
2024-11-25 05:31:04 C 06 05 31.121 +13 42 50.00 V W68
2024-11-25 05:35:40 C 06 05 30.811 +13 42 49.43 V W68
2024-11-25 05:36:20 C 06 05 30.802 +13 42 49.68 V W68
2024-11-25 06:08:07 C 06 05 28.834 +13 42 47.41 V W68
2024-11-25 06:08:46 C 06 05 28.774 +13 42 47.23 V W68
2024-11-25 06:12:01 C 06 05 28.594 +13 42 47.45 V W68
2024-11-25 06:12:40 C 06 05 28.553 +13 42 47.16 V W68
2024-11-25 06:17:15 C 06 05 28.246 +13 42 47.34 V W68
2024-11-26 09:27:13 C 06 03 50.563 +13 41 04.16 V T05
2024-11-26 09:29:52 C 06 03 50.381 +13 41 03.48 V T05
2024-11-26 09:35:15 C 06 03 50.069 +13 41 04.06 V T05
2024-11-26 10:23:46 C 06 03 47.009 +13 41 00.28 V T05
2024-11-28 10:18:03 C 06 00 49.495 +13 38 29.04 V T05
2024-11-28 11:02:05 C 06 00 46.656 +13 38 27.06 V T05
2024-11-28 11:05:51 C 06 00 46.430 +13 38 26.74 V T05
2024-11-28 11:12:22 C 06 00 45.982 +13 38 27.13 V T05
2024-11-28 23:57:46 B 05 59 57.86 +13 37 47.9 X K19
2024-11-29 00:02:56 B 05 59 57.51 +13 37 47.3 X K19
2024-11-29 00:08:04 B 05 59 57.22 +13 37 47.5 X K19
2024-11-29 09:01:39 C 05 59 23.622 +13 37 25.40 X F52
2024-11-29 09:17:08 C 05 59 22.611 +13 37 24.78 X F52
2024-11-29 09:32:37 C 05 59 21.597 +13 37 24.19 X F52
2024-11-29 09:48:12 C 05 59 20.582 +13 37 23.56 X F52
2024-11-30 10:27:23 C 05 57 46.015 +13 36 21.24 V T05
2024-11-30 10:30:00 C 05 57 45.833 +13 36 20.77 V T05
2024-11-30 10:34:35 C 05 57 45.523 +13 36 20.84 V T05
2024-11-30 10:42:26 C 05 57 45.010 +13 36 20.20 V T05
2024-11-30 23:14:17 C 05 56 56.491 +13 35 57.62 V M22
2024-11-30 23:16:53 C 05 56 56.309 +13 35 57.59 V M22
2024-11-30 23:53:54 C 05 56 53.837 +13 35 56.08 V M22
2024-12-01 00:33:23 C 05 56 51.233 +13 35 54.60 V M22
2024-12-02 10:45:00 C 05 54 37.822 +13 34 36.41 V T05
2024-12-02 11:21:31 C 05 54 35.359 +13 34 35.69 V T05
2024-12-02 11:24:08 C 05 54 35.182 +13 34 35.08 V T05
2024-12-02 11:28:06 C 05 54 34.910 +13 34 35.04 V T05
2024-12-04 10:53:27 C 05 51 27.247 +13 33 16.67 V T08
2024-12-04 11:11:38 C 05 51 25.982 +13 33 16.52 V T08