SBIG ST8300M, Astrodon filters: Ha 5nm, RGB E-Series GenII
LRGB Total 1:45 hours = L(Ha) 60 min. [10x5 min.] + R,G,B 3x5 min. each
Boren-Simon 2.8-8 CF (Carbon Fiber) OTA - http://www.powernewts.com
AP GTO1200 mount, guided w/PHD and EQMOD

This image is 1570x1175 pixels, Roundness 0.113 FWHM 4.622
RA 16h 55m 30s, Dec -41° 15' 31"
Pos Angle +264° 50' (R), FL 605.9 mm, 3.91"/Pixel

A non-annotated version of this image can be found here: http://www.pbase.com/boren/image/153075955/original

The open star cluster NGC6231 occupying the bottom left side of this image, is located close to Zeta Scorpii and is embedded in a huge region of emission nebulae.
It lies in a magnificent region of sky at the point where the Scorpion's tail is attached to the body. John Herschel observed it at the Cape of Good Hope with
an 18-inch f/13 speculum telescope. He recorded it [(1847) Cape Observations] as "a fine bright large cluster pretty rich, class VII. 10', stars 10..13th mag.
Place of a double star 5th mag, the preceding but one of 7 bright stars in the middle."

The top right of this image shows a section of the Prawn Nebula (IC4628/GUM56), that can also be found on this site,
here: http://www.pbase.com/boren/image/140816166/original and here: http://www.pbase.com/boren/image/151993909/original