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
1999-11-10 02:30:06 C 22 59 25.90 -15 09 08.1 18.2 a 704
1999-11-10 02:53:24 C 22 59 29.78 -15 08 46.2 18.0 a 704
1999-11-10 03:16:45 C 22 59 33.66 -15 08 24.1 17.8 a 704
1999-11-16 04:15:53 C 23 22 44.66 -12 52 18.0 i 670
1999-11-16 04:27:20 C 23 22 46.33 -12 52 07.1 i 670
1999-11-29 18:07:37 C 00 05 29.32 -08 08 08.1 z 108
1999-11-29 18:16:41 C 00 05 30.51 -08 07 59.5 z 108
1999-11-29 18:24:29 C 00 05 31.12 -08 07 58.2 z 108
1999-12-02 02:48:36 C 00 11 57.18 -07 22 04.7 17.2 a 704
1999-12-02 03:13:51 C 00 11 59.95 -07 21 44.9 17.3 a 704
1999-12-02 03:41:36 C 00 12 02.99 -07 21 22.7 17.7 a 704
1999-12-02 04:07:36 C 00 12 05.84 -07 21 01.6 17.4 a 704
2000-01-08 01:50:41 C 01 35 10.19 +02 49 21.9 18.4 a 704
2000-01-08 02:12:43 C 01 35 12.01 +02 49 34.6 18.8 a 704
2000-01-08 02:34:21 C 01 35 13.77 +02 49 47.1 18.7 a 704
2000-01-08 02:56:02 C 01 35 15.44 +02 49 59.9 19.0 a 704
2000-01-08 03:17:53 C 01 35 17.27 +02 50 12.7 19.3 a 704
2002-04-16 15:30:40 C 21 24 52.46 -09 20 41.3 c 474
2002-04-16 15:33:29 C 21 24 53.08 -09 20 39.0 c 474
2002-04-16 15:36:10 C 21 24 53.48 -09 20 36.4 c 474
2002-04-16 15:38:39 C 21 24 54.07 -09 20 33.8 c 474
2002-09-05 10:18:14 C 05 41 44.16 +18 32 13.3 18.9 c 704
2002-09-05 10:40:17 C 05 41 45.76 +18 32 10.7 19.9 c 704
2002-09-05 11:01:10 C 05 41 47.26 +18 32 07.8 19.5 c 704
2002-09-05 11:21:59 C 05 41 48.80 +18 32 05.5 19.3 c 704
2002-09-06 10:06:42 C 05 43 28.23 +18 29 14.7 19.4 c 704
2002-09-06 10:29:27 C 05 43 29.81 +18 29 10.8 19.0 c 704
2002-09-06 10:50:59 C 05 43 31.25 +18 29 08.4 19.6 c 704
2002-10-03 09:44:12 C 06 17 51.05 +16 42 54.1 18.7 c 704
2002-10-03 10:05:56 C 06 17 51.74 +16 42 51.3 19.2 c 704
2002-10-03 10:28:29 C 06 17 52.44 +16 42 46.8 19.3 c 704
2002-10-03 10:50:46 C 06 17 53.16 +16 42 43.8 19.2 c 704
2002-10-03 11:12:31 C 06 17 53.77 +16 42 38.5 18.8 c 704
2002-10-09 09:33:50 C 06 21 45.97 +16 16 04.1 18.6 c 704
2002-10-09 09:57:39 C 06 21 46.42 +16 15 59.5 18.6 c 704
2002-10-09 10:20:51 C 06 21 46.96 +16 15 54.8 19.0 c 704
2002-10-09 10:42:24 C 06 21 47.33 +16 15 51.5 19.2 c 704
2002-10-09 11:03:16 C 06 21 47.75 +16 15 47.0 18.9 c 704
2002-11-07 10:37:37 C 06 17 46.14 +14 18 43.1 c 704
2002-11-07 11:02:49 C 06 17 45.21 +14 18 39.5 c 704
2002-11-07 11:28:04 C 06 17 44.30 +14 18 35.8 c 704
2002-11-07 11:53:13 C 06 17 43.38 +14 18 32.2 c 704
2002-11-07 12:18:26 C 06 17 42.48 +14 18 28.7 c 704
2002-11-11 08:01:35 C 06 14 13.33 +14 06 36.3 18.7 c 704
2002-11-11 08:26:20 C 06 14 12.27 +14 06 33.6 18.7 c 704
2002-11-11 09:41:24 C 06 14 09.02 +14 06 24.1 18.7 c 704
2002-11-30 01:41:25 C 05 49 14.98 +13 27 04.7 941
2002-11-30 01:46:43 C 05 49 14.55 +13 27 04.6 941
2002-11-30 01:52:01 C 05 49 14.24 +13 27 04.3 941
2002-11-30 01:57:19 C 05 49 13.90 +13 27 04.2 941