Messier 5 or M5 (also designated NGC 5904) is a globular cluster in the constellation Serpens.  Under extremely good conditions, M5 is just visible to the naked eye as a faint "star" near the star 5 Serpentis. Binoculars or small telescopes will identify the object as non-stellar while larger telescopes will show some individual stars, of which the brightest are of apparent magnitude 12.2.

M5 was discovered by the German astronomer Gottfried Kirch in 1702 when he was observing a comet. Charles Messier also noted it in 1764, but thought it a nebula without any stars associated with it. William Herschel was the first to resolve individual stars in the cluster in 1791, counting roughly 200.

http://en.wikipedia.org/wiki/Messier_5

 

ABOUT THE IMAGE

DATE/TIME:  The evening of May 20th, 2014.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25 @ F/6.3

ISO SETTING:  800

EXPOSURES:  10

EXPOSURE LENGTH:  300sec.

TOTAL EXPOSURE LENGTH:  50min.

SUBTRACTIONS:  16 darkframes, 20 flats, 16 dark-flats.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3

 

 

ABOUT THE IMAGE

DATE/TIME:  The evening of April 12th, 2010.

CAMERA:  Canon XSI, 450D

TELESCOPE:  Orion 100mm ED refractor @ F/18

ISO SETTING:  800

EXPOSURES:  45

EXPOSURE LENGTH:  200sec.

TOTAL EXPOSURE LENGTH:  2 1/2hrs.

SUBTRACTIONS:  20 darkframes, 10 bias frames

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3

 

 

 

 

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