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
2022-02-20 04:10:21 C 03 06 54.45 +11 57 41.6 – V 703
2022-02-20 04:18:35 C 03 06 55.14 +11 57 43.2 – V 703
2022-02-23 05:38:12 C 03 12 20.989 +12 25 35.82 – U F52
2022-02-23 05:53:38 C 03 12 22.121 +12 25 41.49 – U F52
2022-02-23 06:09:08 C 03 12 23.250 +12 25 47.28 – U F52
2022-02-23 06:24:41 C 03 12 24.398 +12 25 53.04 – U F52
2022-03-15 02:31:32 C 03 47 55.76 +15 06 32.5 – V G96
2022-03-15 02:39:36 C 03 47 56.35 +15 06 34.7 – V G96
2022-03-15 02:47:39 C 03 47 56.95 +15 06 37.4 – V G96
2022-03-15 02:55:44 C 03 47 57.51 +15 06 39.7 – V G96
2022-03-22 02:41:45 C 04 00 33.63 +15 54 45.5 – V V00
2022-03-22 02:48:46 C 04 00 34.14 +15 54 47.3 – V V00
2022-03-22 02:55:45 C 04 00 34.66 +15 54 49.3 – V V00
2022-03-22 03:02:46 C 04 00 35.20 +15 54 51.2 – V V00
2022-12-18 21:02:17 C 10 02 10.77 +07 53 48.5 – V D29
2022-12-18 21:43:01 C 10 02 10.57 +07 53 48.7 – V D29
2023-01-13 13:03:54 C 09 50 18.532 +08 48 17.24 – V G96
2023-01-13 13:08:00 C 09 50 18.416 +08 48 17.32 – V G96
2023-01-13 13:12:05 C 09 50 18.272 +08 48 17.93 – V G96
2023-01-13 13:16:11 C 09 50 18.121 +08 48 18.61 – V G96
2023-01-14 10:32:55 C 09 49 35.878 +08 52 02.31 – U F52
2023-01-14 10:49:20 C 09 49 35.310 +08 52 05.25 – U F52
2023-01-14 11:05:45 C 09 49 34.733 +08 52 08.18 – U F52
2023-01-14 11:22:15 C 09 49 34.161 +08 52 11.17 – U F52
2023-01-19 20:03:25 C 09 44 53.45 +09 16 59.9 – V D29
2023-01-19 20:04:41 C 09 44 53.35 +09 16 59.4 – V D29
2023-01-19 20:23:47 C 09 44 52.59 +09 17 03.9 – V D29
2023-01-19 20:25:03 C 09 44 52.51 +09 17 04.6 – V D29
2023-01-23 10:22:16 C 09 41 25.485 +09 35 47.58 – U F52
2023-01-23 10:39:43 C 09 41 24.735 +09 35 51.63 – U F52
2023-01-23 11:15:00 C 09 41 23.225 +09 35 59.54 – U F52
2023-01-29 19:23:49 C 09 34 44.24 +10 12 32.0 – V D29
2023-01-29 19:44:10 C 09 34 43.31 +10 12 37.4 – V D29
2023-01-29 20:04:32 C 09 34 42.37 +10 12 42.2 – V D29
2023-02-10 06:57:18 C 09 21 41.036 +11 25 58.04 – V V00
2023-02-10 07:04:31 C 09 21 40.676 +11 25 59.95 – V V00
2023-02-10 07:11:40 C 09 21 40.331 +11 26 02.00 – V V00
2023-02-10 07:18:49 C 09 21 39.971 +11 26 03.88 – V V00
2023-02-12 06:11:35 C 09 19 24.319 +11 38 58.31 – V G96
2023-02-12 06:18:54 C 09 19 23.966 +11 39 01.19 – V G96
2023-02-12 06:26:13 C 09 19 23.585 +11 39 02.77 – V G96
2023-02-20 14:24:10 C 09 09 57.53 +12 33 40.2 – V D29
2023-02-20 14:44:32 C 09 09 56.59 +12 33 46.5 – V D29
2023-02-20 15:04:54 C 09 09 55.62 +12 33 51.3 – V D29
2023-02-21 17:21:07 C 09 08 44.02 +12 40 51.2 – V D29
2023-02-21 17:41:29 C 09 08 43.07 +12 40 57.0 – V D29
2023-02-27 14:08:41 C 09 02 39.12 +13 17 11.0 – V D29
2023-02-27 14:30:55 C 09 02 38.21 +13 17 16.8 – V D29
2023-02-27 14:51:17 C 09 02 37.36 +13 17 21.7 – V D29
2023-03-16 05:55:58 C 08 49 15.258 +14 43 51.07 – U F51