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Asteroid 3200 Phaethon, parent body of the Geminids, imaged on 25 Dec 2010 with the 37 cm F14 Cassegrain telescope of Winer Observatory, Sonoita (MPC 857)

Winer Observatory is an astronomical observatory near Sonoita, Arizona in the United States. It is a private, non-profit observatory, operated by Mark Trueblood since 1983. It has been the site of a number of significant small telescopes and famous robotic telescopes. It has been the site of the Iowa Robotic Observatory. The facility also hosted Michael Schwartz's telescope, active in supernova patrols, until Tenagra Observatories opened a facility in the area. Is the site of the Kilodegree Extremely Little Telescope.


  1. "Winer Observatory homepage". Winer Observatory. Retrieved December 16, 2005.

Coordinates: 31°39′56.08″N 110°36′6.42″W / 31.6655778°N 110.6017833°W / 31.6655778; -110.6017833