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
2002-12-01 06:59:41 C 05 47 18.86 +13 25 41.6 18.0 c 704
2002-12-01 07:20:53 C 05 47 17.38 +13 25 40.6 18.6 c 704
2002-12-01 07:41:58 C 05 47 15.92 +13 25 39.5 18.4 c 704
2002-12-01 08:03:10 C 05 47 14.51 +13 25 38.9 18.3 c 704
2002-12-10 20:07:31 C 05 31 51.17 +13 19 58.8 c 198
2002-12-10 20:38:38 C 05 31 49.03 +13 19 59.1 c 198
2002-12-10 21:09:46 C 05 31 46.92 +13 19 58.8 c 198
2002-12-10 21:18:59 C 05 31 46.28 +13 19 58.8 c 198
2002-12-14 07:06:54 C 05 26 20.93 +13 20 21.1 18.7 c 704
2002-12-14 07:29:10 C 05 26 19.46 +13 20 21.9 19.1 c 704
2002-12-14 07:51:20 C 05 26 17.98 +13 20 20.9 18.6 c 704
2002-12-14 08:13:42 C 05 26 16.43 +13 20 21.7 18.7 c 704
2002-12-14 08:35:51 C 05 26 14.98 +13 20 21.4 18.8 c 704
2002-12-14 09:20:59 C 05 26 12.00 +13 20 20.5 t 644
2002-12-14 10:54:26 C 05 26 05.75 +13 20 21.0 t 644
2002-12-14 12:25:05 C 05 25 59.79 +13 20 22.0 t 644
2003-01-01 06:29:06 C 05 02 14.12 +13 41 19.3 19.2 c 704
2003-01-01 07:12:22 C 05 02 12.19 +13 41 24.6 19.3 c 704
2003-01-01 07:34:01 C 05 02 11.15 +13 41 28.0 19.2 c 704
2003-01-02 03:33:11 C 05 01 19.86 +13 43 08.7 18.8 c 704
2003-01-02 03:55:03 C 05 01 18.91 +13 43 10.6 19.3 c 704
2003-01-02 04:39:23 C 05 01 16.93 +13 43 15.1 19.4 c 704
2003-01-02 05:01:46 C 05 01 15.98 +13 43 16.7 19.1 c 704
2003-01-07 05:29:09 C 04 56 39.18 +13 54 54.7 19.3 c 704
2003-01-07 05:50:41 C 04 56 38.39 +13 54 56.6 19.4 c 704
2003-01-07 06:12:12 C 04 56 37.64 +13 54 59.1 19.6 c 704
2003-01-07 06:33:48 C 04 56 36.86 +13 55 01.5 19.4 c 704
2003-01-07 06:55:11 C 04 56 36.08 +13 55 03.9 19.2 c 704
2003-01-17 05:05:43 C 04 50 25.91 +14 23 38.1 c 711
2003-01-17 05:24:13 C 04 50 25.60 +14 23 41.9 c 711
2003-01-17 05:42:49 C 04 50 25.29 +14 23 44.5 c 711
2003-01-18 07:18:22 C 04 49 59.22 +14 27 09.5 t 644
2003-01-18 07:49:03 C 04 49 58.72 +14 27 14.3 t 644
2003-01-18 08:19:58 C 04 49 58.18 +14 27 18.7 t 644
2003-01-27 03:51:11 C 04 47 59.87 +14 57 53.2 19.7 c 704
2003-01-27 04:35:04 C 04 47 59.63 +14 57 59.6 19.7 c 704
2003-01-27 04:57:06 C 04 47 59.53 +14 58 02.8 20.4 c 704
2003-01-27 05:19:01 C 04 47 59.47 +14 58 07.0 19.6 c 704
2003-01-27 05:43:13 C 04 47 59.43 +14 58 11.4 19.4 c 644
2003-01-27 06:13:21 C 04 47 59.32 +14 58 15.6 20.1 c 644
2003-01-27 06:43:41 C 04 47 59.23 +14 58 21.6 18.4 c 644
2003-02-03 04:01:43 C 04 48 19.71 +15 24 15.6 t 644
2003-02-03 04:32:00 C 04 48 19.90 +15 24 20.2 t 644
2003-02-03 05:02:22 C 04 48 20.05 +15 24 25.5 t 644
2004-02-11 09:32:03 C 10 35 17.82 +06 30 33.2 19.4 c 644
2004-02-11 10:06:53 C 10 35 16.28 +06 30 43.4 19.4 c 644
2004-02-11 10:36:36 C 10 35 14.98 +06 30 52.5 19.6 c 644
2004-02-14 11:09:34 C 10 32 03.12 +06 52 50.0 c 691
2004-02-14 11:48:28 C 10 32 01.35 +06 53 01.8 c 691
2004-02-14 12:29:03 C 10 31 59.48 +06 53 14.5 c 691