12923 Zephyr

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Discovery[1] and designation
Discovered by Lowell Observatory Near-Earth-Object Search
Discovery site Anderson Mesa Station, Flagstaff, AZ
Discovery date 11 April 1999
MPC designation 12923 Zephyr
Alternative names 1999 GK4
Orbital characteristics[1]
Epoch May 14, 2008
Aphelion 2.926579337 AU
Perihelion 0.99797584 AU
Semi-major axis 1.962277587 AU
Eccentricity 0.49141964
Orbital period 2.7488362 yr (1004.012436 days)
Mean anomaly 57.506716°
Inclination 5.289203°
Longitude of ascending node 168.35112°
Argument of perihelion 146.76984°
Physical characteristics
Sidereal rotation period 3.891 h[1]
Absolute magnitude (H) 15.8[1]

12923 Zephyr (1999 GK4) is an Apollo asteroid and near-Earth object. Its name is derived from the ancient Greek god of the west wind Zephyrus and suggested by M. Smitherman.[1]