639 Latona is a minor planet orbiting the Sun that was discovered by German astronomer Karl Lohnert on July 19, 1907, at Heidelberg. Photometric observations of this asteroid at Palmer Divide Observatory in Colorado Springs, Colorado, during 2007 gave a light curve with a period of 6.139 ± 0.002 hours and a brightness variation of 0.08 ± 0.01 in magnitude. This confirms period measurements of about 6.2 hours reported in 1987 and 2001. This is a member of the dynamic Eos family of asteroids that most likely formed as the result of a collisional breakup of a parent body. References External links Lightcurve plot of 639 Latona, Palmer Divide Observatory, B. D. Warner (2007) Asteroid Lightcurve Database (LCDB), query form (info ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center Eos asteroids Latona Leto Latona S-type asteroids (Tholen) 19070719