M-13 
M-13 is know as the "Great Globular Cluster" in Hercules.  It is very large and bright and a superb sight even in a small 90 mm scope.  In an 8 or 10 inch scope the cluster seems to be a swarm of stars that is sure to impress any first time observer through your scope.  It is also easy to find because of it's location in the constellation.   M-13 is a very nice object.  I have imaged it several times trying different focal ratios and exposure combinations.  I've found that it is very difficult to capture the visual appearance of the Globular with a CCD images.  The visual appearance to me is that of a swarm of stars.  The f4.8 image is my best approximation so far.
    Constellation:  Hercules

    Size:  21'

    Magnitude: 5.8

    Magnitude Tip: 11.9

    RA:  16h 41m 42s

    Dec: 36m 27m 36s

Click here for a larger image.

 Scope:   Orion MAK 500
Nikon w/ Kodak MAX 800 Film
Focal Ratio: f5.5
Exposure:  10 min
Scope:   Orion MAK 500
MX-5C CCD Camera
Focal Ratio: f5.5
Exposure:  2 min
Scope:   8" LX 200 SCT
MX-5C CCD Camera and STAR 2000
Focal Ratio: f3.3
Exposure:  Combined one 5 min and one 10 min in Photoshop using mask to blend.
Scope:   8" LX 200 SCT
MX-5C CCD Camera
Focal Ratio: f4
Exposure:  2 min
Scope:   8" LX 200 SCT
MX-5C CCD Camera, STAR 2000 & IDAS LPR Filter
Focal Ratio: f4.8
Exposure:  Combined one 5 min for the core and a 37 min exposure for the outer regions.  Combined in Photoshop using mask to blend.
Scope:   8" LX 200 SCT
MX-5C CCD Camera and STAR 2000
Focal Ratio: f6.6
Exposure:  Combined one 10 min and one 20 min in Photoshop using mask to blend.
Scope:   8" LX 200 SCT
MX-5C CCD Camera
Focal Ratio: f10
Exposure:  2 min
Link to the SEDS M-13 Page
   
Back One Page
Home