NGC 4625 - Spiral Galaxy in Coma Berenices


Copyright 2010 Hap Griffin

NGC 4725 is peculiar in that this spriral galaxy only has one main spiral arm rather than the normal two.  The outer gas and dust regions can also be seen to have their own spiral structure.  Many other distant galaxies can be spotted in this image as well.

NGC 4725 lies at a distance of 41 million light-years and is over 100,000 light-years in diameter. 


Date/Location:    May 9, 2010     Griffin/Hunter Observatory    Bethune, SC
Camera: QSI 583wsg
Filters: Astrodon E Series Generation 2 LRGB
CCD Temperature: -10 C
Instrument:    Planewave CDK 12.5"  
Focal Ratio:   f/8
Mount: AP-1200
Guiding:    Auto via the QSI camera's built in Off-Axis Guider mirror and an SBIG ST-402 Guider
Conditions:    Clear and cool
Weather:    55 F, still
Exposure: 330 minutes total (15 x 10 min Luminance, 6 x 10 min each in RGB)
Capture: CCDAutopilot 4 w/ Maxim DL Camera Control, focused automatically w/ FocusMax   
Processing:    Frame calibrations, alignment and stacking with ImagesPlus v3.80.  Finishing in Photoshop CS4.