About 90 Millimeter Observatory

I have always believed that, wherever someone sets up their telescope, that becomes their observatory. In keeping with that thought, my observatory is in fact, my backyard. I’m sure that with many amateur astronomers, that is true. Although I do travel to dark sky sites, most of the time I setup in my backyard. The name 90 Millimeter Observatory came about because the telescope I used the most is a 90mm (3.5”) refractor. Now, however, I employ three additional telescopes here at the observatory simply because I enjoy the variety that each one provides. Four telescopes round out the observatory’s equipment:

  • William Optics 90mm (3.5”) 621mm fl. f/6.9 APO Refractor.
  • Orion AstroView 90mm (3.5”) 910mm f/10.1 Refractor.
  • Orion AstroView 120mm (4.7”) 1000mm f/8.3 Refractor.
  • Celestron C6-R 150mm (6.0”) 1200mm fl. f/8 Refractor.

It should be noted here that in 2011 the Orion AstroView 90mm replaced the old Meade Digital Series 90mm refractor and the Celestron C6-R replaced the Celestron Omni XLT 150R.

Sky Conditions

The sky conditions at the observatory are typically poor due largely to light pollution. While the township does have outdoor lighting ordinances in place, they are not enforced. As a result the observatory is in a Red Zone. The faintest star visible to the naked eye is magnitude 4.5 on the very best of nights.

To update this forecast, ctrl >>F5.


About the author

Dan Acker has been an avid deep sky observer since 1978 and is a member of the DVAA, BMA2 and founder of the 90 Millimeter Observatory. In 1986 he co-founded the ChesMont Astronomical Society. Dan welcomes your comments at dan.90mm@gmail.com.