Click here for a 80% full resolution image of M12 (2.3 MB)

 

The Details
Object
M12 (NGC 6218) Globular Cluster in Ophiuchus
Optics
Astro-Physics 12" Mak-Cass f/8
Platform
Astro-Physics 1600 Mount with absolute encoders
Camera
FLI 16803 Proline CCD
Filters
Tru-Balance LRGB filter set Gen 2
Date
09 June 2016
Location
Las Campanas Observatory, Chile
Exposure
L 7ea x 300 sec 1x1 bin, RGB 4ea x 300 sec 1x1 bin
Software
ACP, Maxim DL/CCD, , CCDStack 2, Photoshop CS5
Orientation
Field of view: 51' x 51' centered on RA 16h47m12s
DEC-01°57'00" (2000). North angle 359.7°; east 90° CCW from north
Notes
The constellation Ophiuchus is a richly adorned portion of the sky and has a number of beautiful globular clusters contained within its boundaries. This globular cluster was discovered by Charles Messier on May 30, 1764, one day after his discovery of neighboring cluster M10. It lies about 16,000 light years from earth, spans about 75 light years in diameter, and has an approach velocity of 16 km/sec towards earth. At magnitude 6.7 it's just too faint for the naked eye but makes an interesting object in a small telescope. A 4-5 inch telescope will begin to resolve some of the brighter stars around the core.

Located at a 5 o’clock position and 7 arc-min from the center of M12 are two small galaxies visible in close proximity in the higher resolution image, the northerly most one being 2MASX J16470200-0202314.  With a recessional speed of 11917 km/sec and redshift of 0.061662 (ref: Simbad), this galaxy is between 850 to 900 million light-years away assuming a Hubble constant of 70 km/sec/Mpc.  In the upper right corner of the image is galaxy PGC 59025, a 15th magnitude object over 70 million light-years from Earth.  Upon close examination countless other distant galaxies can be found sprinkled amongst the starry landscape.

This image is the result of a collaborative effort between Howard Hedlund of Astro-Physics, Inc. and Dave Jurasevich.

 

 

 

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No reproduction of these images are permitted without prior approval of the author.