Asteroid General Data

1999 GK₄ (12923 Zephyr)

General information

Preliminary designation	1999 GK₄
Name	Zephyr
Number	12923
Group	Apollo
Absolute magnitude	15.80
Approximate diameter (m)	1 800
Approximate mass (kg)	1.14·10¹³
Number of observations	2994
Arc length (days)	25904

Approaches

No approaches found

Orbit initial data

Date of initial data	09/17/2026
M – mean anomaly (degrees)	302.465002
a – orbit major semiaxis (astronomical units)	1.96165700
e – orbit eccentricity	0.49312000
ω – orbit ascending node-perihelion angle (degrees)	147.240502
Ω – longitude of orbit ascending node (degrees)	168.073329
i – orbit inclination to the ecliptic plane (degrees)	5.312127

Orbital evolution

Date	M	a	e	ω	Ω	i	q	P
01/13/1829	333.961383	1.96503360	0.49217719	143.446059	170.594227	5.130904	0.99788890	2.754581
01/21/1858	167.883189	1.96387531	0.49238059	143.846823	170.285712	5.150355	0.99690123	2.752146
01/29/1887	4.123389	1.96304857	0.49206718	144.521396	169.846753	5.181506	0.99709681	2.750408
02/07/1916	204.681754	1.96122574	0.49190998	145.161242	169.460690	5.210234	0.99647922	2.746578
02/14/1945	48.560033	1.96047544	0.49201155	145.792696	169.059189	5.241300	0.99589889	2.745002
02/22/1974	253.983794	1.96106055	0.49144256	146.134265	168.786902	5.258952	0.99731194	2.746231
03/02/2003	98.742672	1.96114555	0.49239377	146.588766	168.436297	5.281736	0.99548970	2.746410
03/09/2032	299.737241	1.96185346	0.49270315	147.231684	168.051601	5.312596	0.99524207	2.747897
03/17/2061	135.481702	1.96510769	0.49255297	147.851408	167.681852	5.336659	0.99718806	2.754737
03/25/2090	329.646856	1.96505086	0.49231799	148.292263	167.385200	5.363438	0.99762096	2.754618
04/03/2119	162.949523	1.96411402	0.49298880	148.713003	167.068366	5.383949	0.99582781	2.752648
04/10/2148	357.109511	1.96371117	0.49260565	149.316841	166.692360	5.414730	0.99637595	2.751801
04/18/2177	193.765884	1.96300941	0.49237176	149.890599	166.380606	5.442790	0.99647901	2.750326

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