Welcome to the Custer Institute

The Custer Institute and Observatory is Long Island's oldest public observatory (est.1927). Open to the public every Saturday evening from dark until midnight, our staff of volunteers will give you a tour of the facilities and the night sky through our powerful telescopes. Custer has frequent lectures, classes,concerts, art exhibits and other special events. Consider our observatory for your next meeting or theme party.

Click for Tonight's Weather in Southold.

Dave Barnett used his 7" f/15 Mak and a dmk41au machine camera to create this high res image of our nearest natural satellite. This final image seen here is made up from 40 sub panels that were blended together in Photoshop. Each of the sub panels is a stack of the best shots out of 1200 frames generated each video take. We are looking at over 40 gig of video data needed to create this image.

For those who need the tech info:
  • Scope - Orion Mak 180 f/15
  • Camera - Imaging Source DMK 41au @ 15fps
  • Mount - Orion Altals EQG
  • Capture Software - IC Capture
  • Stacking - AutoStakkert
  • Sharpening - Registax6
  • Final assembly and processing - Photoshop CS6

  • As the days get warmer, the night comes later. Remembering that Custer is run by volunteers, despite the time of darkness,
    Custer will open at 7pm. Observing from the dome will begin after 8pm. See you then!

    Weather Permitting:

    Saturday Night Observing, open to public, dark to midnight, weather permitting Staff provide guided tours of the sky. Clouds, fog, rain, and full moon nights are not good nights. The less moon, the better for most observing. Check the moon calendar. Plan your visit by reading this.

    Updated: October 01, Two Thousand Fifteen
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