IAA RAS IAA Minor Planet Database

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
2020-01-24 07:59:36 C 08 22 57.786 +13 38 22.53 – U F51
2020-01-24 08:14:02 C 08 22 57.037 +13 38 25.70 – U F51
2020-01-24 08:28:29 C 08 22 56.284 +13 38 28.90 – U F51
2020-01-24 08:42:54 C 08 22 55.540 +13 38 32.01 – U F51
2020-01-25 05:22:39 C 08 21 52.48 +13 42 59.4 – U I41
2020-01-25 05:35:58 C 08 21 51.79 +13 43 02.3 – U I41
2020-01-25 05:57:46 C 08 21 50.67 +13 43 07.0 – U I41
2020-01-25 07:38:09 C 08 21 45.44 +13 43 28.7 – V G96
2020-01-25 07:45:30 C 08 21 45.04 +13 43 30.4 – V G96
2020-01-25 07:52:52 C 08 21 44.77 +13 43 31.9 – V G96
2020-01-25 08:00:13 C 08 21 44.37 +13 43 31.8 – V G96
2020-01-25 12:02:35 C 08 21 31.882 +13 44 27.09 – U F51
2020-01-25 12:21:55 C 08 21 30.875 +13 44 31.23 – U F51
2020-01-25 12:41:12 C 08 21 29.875 +13 44 35.34 – U F51
2020-01-25 13:00:33 C 08 21 28.871 +13 44 39.53 – U F51
2020-01-26 06:29:38 C 08 20 35.82 +13 48 26.9 – U I41
2020-01-26 06:54:01 C 08 20 34.49 +13 48 31.4 – V 703
2020-01-26 07:01:32 C 08 20 34.19 +13 48 32.9 – V 703
2020-01-26 07:16:33 C 08 20 33.37 +13 48 36.6 – V 703
2020-01-26 07:24:03 C 08 20 33.01 +13 48 38.7 – U I41
2020-01-26 07:31:03 C 08 20 32.65 +13 48 40.2 – U I41
2020-01-27 06:33:44 C 08 19 22.62 +13 53 41.7 – U I41
2020-01-27 06:35:03 C 08 19 22.54 +13 53 42.0 – U I41
2020-01-27 07:35:38 C 08 19 19.36 +13 53 55.5 – U I41
2020-01-30 06:09:14 C 08 15 46.60 +14 09 21.7 – U I41
2020-01-30 06:53:45 C 08 15 44.30 +14 09 31.0 – U I41
2020-01-30 06:55:03 C 08 15 44.23 +14 09 30.9 – U I41
2020-01-31 04:59:38 C 08 14 38.45 +14 14 20.6 – U I41
2020-01-31 07:03:31 C 08 14 32.16 +14 14 47.8 – U I41
2020-02-01 05:19:52 C 08 13 26.30 +14 19 40.2 – V G96
2020-02-01 05:27:55 C 08 13 25.89 +14 19 41.7 – V G96
2020-02-01 05:35:57 C 08 13 25.46 +14 19 43.6 – V G96
2020-02-01 05:37:14 C 08 13 25.36 +14 19 42.6 – V 703
2020-02-01 05:44:00 C 08 13 25.06 +14 19 45.2 – V G96
2020-02-01 05:44:45 C 08 13 24.87 +14 19 45.8 – V 703
2020-02-01 05:59:48 C 08 13 24.01 +14 19 48.6 – V 703
2020-02-02 05:05:11 C 08 12 16.48 +14 24 50.5 – U I41
2020-02-02 05:25:56 C 08 12 15.48 +14 24 54.8 – U I41
2020-02-02 06:55:17 C 08 12 11.02 +14 25 14.5 – U I41
2020-02-02 06:56:36 C 08 12 10.93 +14 25 14.9 – U I41
2020-02-04 07:51:37 C 08 09 49.524 +14 35 52.12 – U F52
2020-02-04 08:21:43 C 08 09 48.056 +14 35 59.27 – U F52
2020-02-04 08:36:51 C 08 09 47.327 +14 36 02.36 – U F52
2020-02-12 03:18:29 C 08 01 21.95 +15 15 18.5 – U I41
2020-02-12 04:04:21 C 08 01 20.00 +15 15 28.0 – U I41
2020-02-12 04:36:58 C 08 01 18.55 +15 15 34.5 – U I41
2020-02-12 06:23:11 C 08 01 13.98 +15 15 56.5 – U I41
2020-02-14 06:00:56 C 07 59 16.11 +15 25 31.4 – V G96
2020-02-14 06:08:55 C 07 59 15.80 +15 25 33.0 – V G96
2020-02-14 06:16:56 C 07 59 15.46 +15 25 34.6 – V G96