Antilhue - Chile

Messier 14
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Image Data

Designation M 14,  NGC 6402,  Bennett  97
Object type Globular cluster
Coordinates 17 h 38 min    - 03° 15'   Ophiuchus  (Oph)
Description Messier 14 is a slightly elliptically shaped stellar swarm, about 100 light years across and about 30.000 light years away.   While its bright main body measures only about 3 arc minutes in angular diameter, the cluster's outlayers reach out to a total apparent diameter of 11.7 arc min.  M 14's apparent visual brightness of 7.6 visual magnitudes corresponds to an absolute magnitude of -9.12, or to a luminosity about 400,000 times that of our sun.  So while it is apparently dimmer than the two other great Ophiuchus clusters M10 and M12 (an effect of its greater distance), it is intrinsically much more luminous.

The brightest stars of M14 are of about visual mag 14.0

Click on the image for a higher resolution version.  The field of view is  37 x 25 arcminutes with north towards the top.

Exposure NRGB 48:20:20:20 min @ -20°C ;  all exposures unbinned, no filter on luminance
Camera SBIG STL-11000 with Astronomik Type 2 RGB filterset  -  selfguided
Optics RCOS 14.5" Ritchey-Chrétien @ f/9 (prime focus)
Mount Astro-Physics AP1200GTO
Software MaxIm DL/CCD,  Sigma Pre Beta 11,  Adobe Photoshop CS
Location - Date - Time San Esteban (Chile) - 19Jul2006 @ 03:30 UTC
Conditions Transparency 7/10,  Seeing 5/10, Temperature  + 15°C,  wind