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
2024-12-31 03:18:52 C 05 12 17.352 +13 52 42.67 V W68
2024-12-31 03:30:07 C 05 12 16.805 +13 52 42.56 V W68
2024-12-31 03:53:46 C 05 12 15.636 +13 52 44.69 V W68
2024-12-31 16:50:12 C 05 11 38.74 +13 53 41.1 V D29
2024-12-31 17:10:34 C 05 11 37.75 +13 53 42.9 V D29
2025-01-01 12:27:53 C 05 10 44.088 +13 55 21.97 V T05
2025-01-01 12:38:33 C 05 10 43.526 +13 55 22.19 V T05
2025-01-01 12:47:09 C 05 10 43.159 +13 55 23.23 V T05
2025-01-01 13:12:21 C 05 10 41.988 +13 55 24.78 V T05
2025-01-03 06:11:13 C 05 08 53.372 +13 59 02.33 V G96
2025-01-03 06:18:37 C 05 08 53.034 +13 59 02.90 V G96
2025-01-03 06:25:59 C 05 08 52.710 +13 59 03.62 V G96
2025-01-03 06:33:23 C 05 08 52.361 +13 59 04.49 V G96
2025-01-03 09:05:16 C 05 08 45.890 +13 59 19.93 V T08
2025-01-03 09:09:27 C 05 08 45.730 +13 59 20.11 V T08
2025-01-03 09:17:24 C 05 08 45.362 +13 59 21.30 V T08
2025-01-03 09:33:24 C 05 08 44.662 +13 59 22.38 V T08
2025-01-04 06:45:37 C 05 07 51.388 +14 01 20.79 X F52
2025-01-04 07:01:15 C 05 07 50.718 +14 01 22.32 X F52
2025-01-04 07:16:49 C 05 07 50.045 +14 01 23.84 X F52
2025-01-04 07:32:25 C 05 07 49.374 +14 01 25.33 X F52
2025-01-04 08:38:10 C 05 07 46.488 +14 01 32.05 V T08
2025-01-04 09:12:56 C 05 07 45.024 +14 01 34.93 V T08
2025-01-04 09:34:59 C 05 07 44.057 +14 01 37.24 V T08
2025-01-04 09:39:40 C 05 07 43.877 +14 01 37.67 V T08
2025-01-05 22:03:37 C 05 06 16.488 +14 05 15.50 V M22
2025-01-05 22:08:11 C 05 06 16.289 +14 05 16.73 V M22
2025-01-05 22:19:16 C 05 06 15.898 +14 05 17.30 V M22
2025-01-05 22:36:51 C 05 06 15.149 +14 05 19.57 V M22
2025-01-06 11:29:54 C 05 05 45.94 +14 06 30.1 V D29
2025-01-06 11:33:43 C 05 05 45.79 +14 06 30.5 V D29
2025-01-06 11:50:16 C 05 05 45.15 +14 06 32.3 V D29
2025-01-06 11:54:05 C 05 05 45.00 +14 06 32.6 V D29
2025-01-06 12:10:37 C 05 05 44.35 +14 06 34.4 V D29
2025-01-06 12:14:26 C 05 05 44.19 +14 06 34.7 V D29
2025-01-07 12:21:33 C 05 04 50.57 +14 09 04.2 V D29
2025-01-07 12:41:54 C 05 04 49.82 +14 09 06.4 V D29
2025-01-07 13:02:16 C 05 04 49.05 +14 09 08.8 V D29
2025-01-19 01:52:54 C 04 57 22.939 +14 42 23.18 V G96
2025-01-19 02:01:01 C 04 57 22.788 +14 42 24.30 V G96
2025-01-19 02:09:07 C 04 57 22.633 +14 42 25.38 V G96
2025-01-19 02:17:13 C 04 57 22.482 +14 42 26.50 V G96
2025-01-19 08:44:15 C 04 57 15.435 +14 43 19.50 X F51
2025-01-19 09:01:06 C 04 57 15.117 +14 43 21.72 X F51
2025-01-19 09:17:53 C 04 57 14.811 +14 43 23.96 X F51
2025-01-19 09:34:41 C 04 57 14.492 +14 43 26.14 X F51
2025-01-19 09:39:40 C 04 57 14.402 +14 43 26.77 X F51
2025-01-19 09:57:00 C 04 57 14.081 +14 43 29.05 X F51
2025-01-19 10:14:14 C 04 57 13.765 +14 43 31.33 X F51
2025-01-19 10:31:27 C 04 57 13.448 +14 43 33.52 X F51