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  • Print publication year: 2010
  • Online publication date: December 2010

7 - Monster-scope challenges: 15-inch and larger telescopes


This final chapter throws down the gauntlet. Today's largest backyard telescopes, defined here as 15 inches in aperture or larger, have the capacity to show us sights that only a few years ago were either unknown entirely or, at the very least, not understood. All require good viewing conditions, whether that is excellent transparency, steady seeing, freedom from light pollution, or a combination of all three.

How many of these ultimate challenges can you see?

One of my favorite binocular open clusters in the entire sky is M44, the Beehive Cluster or Praesepe, in Cancer the Crab. It's a wonderful target through just about any pair of binoculars. Even the smallest, cheapest pair will show a rich vault of stars. Nine of the brightest stars near the center of the cluster form a distinctive V asterism that is sometimes called the Heart of the Crab. The Heart points toward the southwest and always attracts attention.

Hidden among the stars of M44 are no fewer than eight distant galaxies. Until 1987, most of us knew nothing of them. That was the year when the Uranometria 2000.0 star atlas was published. It showed the sky to a depth never before captured in a convenient star atlas format, and immediately shed light on thousands of objects that no amateurs, except possibly for a few extreme deep-sky hunters, even knew existed.

The biggest problem in spotting the galaxies beyond the Beehive is not their dimness, although that is clearly a factor.

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