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M22

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NGC 6656 in Sagittarius Type: Globular Cluster 10.000 l.y. Mag: 5.2 Dim: 33'

M22, in the constellation Sagittarius, can easily be found at two and a half degree NE of Lambda Sgr. This fine globular cluster shines with a magnitude of 5.1, making it one of the five brightest and largest globulars at all. The reason is that M22 is only 10,400 l-y away. M22 would be more famous if it did not have such a low declination. M22 appears fairly large in my 15x70. The granular core is non stellar and shows a somewhat triangular or fan shape. Its N and E edge are more distinctly visible against the fainter halo. A few pinpricks show up near the edge of the fading halo. But these might be foreground stars. Site : Andratx, Mallorca, Spain ( 39° N ) Date : July 28, 2008 Time : around 00.15UT Binoculars : TS 15x70 Marine FOV: 4.4° Filter : none Mount : Trico Machine Sky Window Seeing : 3/5 Transp. : 4/5 Sky brightness : 21.08 magnitudes per square arc second near zenith (SQM reading). Nelm : 6.5 Sketch Orientation : N up, W right. Digital sketch made with Corel Paint Shop Pro X2, based on a raw pencil sketch. (Note: if the sketch does look too dark on your monitor, try to darken the room.)

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Rony De Laet

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