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Spacewatch Friday: Closet Star Cluster: The Obscure Coat Hanger Star Pattern

By Joe Rao
Special to SPACE.com
posted: 07:00 am ET
02 August 2002

Two of the most pleasing sky sights for those using binoculars or a small

One of the most pleasing sky sights through binoculars or a small telescope can be found nearly overhead in our late evening midsummer sky. With the Moon out of the way this week, it is a good time to seek it out.

Most amateur astronomers have heard of such beautiful open star clusters as the Pleiades, Hyades and the Beehive. But have you ever heard of the "Coat Hanger"? Some evening this week, turn your binoculars to the region of the sky roughly halfway between the bright stars Vega and Altair and you will discover Brocchis Cluster in the rather dim and nondescript constellation of Vulpecula, the Little Fox.

During the 1920s, Dalmiro F. Brocchi, then a well-known chart maker for the American Association of Variable Star Observers, designed a star chart depicting the region of the sky around Vulpecula, revealing this cluster. For some reason that I have never been able to fathom, Brocchis Cluster is rarely mentioned, if at all, in most popular astronomy books. Yet, it is the brightest of all the star clusters in this part of the sky! able -->


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UP CLOSE: This image shows how the Coat Hanger Cluster would look through a typical pair of binoculars. The green circle marks the binocular field of view. To stargazers in the Northern Hemisphere, the Coat Hanger appears upside down. Observers in the Southern Hemisphere would see an inverse of this image.

* Graphic made with Starry Night Software
 

SKY MAP: Shows how to find the Coat Hanger cluster amid other easy-to-spot stars.

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In Collinders star catalogue, which was drawn up in 1931, it is cluster No. 399, hence its official designation, Collinder 399.

I accidentally stumbled across it more than 30 years ago while sweeping up and down the Milky Way with 7x35 binoculars. My original impression was that it resembled some sort of a ladle (and since I was visiting my Aunt Irma when I made the discovery, I unofficially christened it "Irmas Ladle").

Others, however, have seen it as a rather curious grouping of about a dozen tiny stars looking very much like an inverted coat hanger. In a clear, dark sky you might even perceive it with the naked eye as a fuzzy patch of light. This is one object that is best suited for binoculars; even a small telescope will provide too much magnification and will cause the stars to appear too widely spaced apart.

However, its really a proper coat hanger only for Southern Hemisphere observers, where it appears right side up. Because it's typically upside down in the Northern Hemisphere, not everyone sees Collinder 399 as a coat hanger. In fact, I once heard of one gentleman out in California who independently discovered it and later inquired as to "why this Fulcrum is never shown on star charts? It is a beautiful sight."

And indeed, now that Ive mentioned this allusion, it may cause many to see this cluster not as a coat hanger, but as a seesaw.

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Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy for The New York Times and other publications, and he is also an on-camera meteorologist for News 12 Westchester, New York.

 

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