100 (NGC 4321), in Coma Berenices
M100, a face-on spiral galaxy in the
galaxy-rich constellation Coma Berenices, is a small (6 x 5 arc minute) but
bright (magnitude 9.3) member of the Coma-Virgo Cluster. It lies about 65-70
million light years distant, according to Kepple & Sanner and has an
estimated diameter of 130,000 light years, similar to the Milky Way's 120,000
light years. North is down in this view, and two small companion galaxies can be
seen, NGC 4328 located at the 3 o'clock position and NGC 4322 located at 5
EDF at f6 on A-P 1200GTO mount; ST-4 guiding
Meade 416XTE CCD camera
with 616 color wheel controlled with MaxIm DL/CCD v3.06. Focus
was optimized with FocusMax
controlling a RoboFocus drive.
L=15x600 sec, R=11x300 sec,
G=11x300 sec, B=11x300 sec, all unbinned. FWHM (MaxIm) varied
from 1.8 to 2.5 through
this series, which was collected over two nights.
Calibrated and RGB assembled in
MaxIm. The luminance image was enhanced with DDP in
MaxIm. L and RGB combined in Photoshop, separately stretched and
unsharp masked or
blurred and then
flattened. This was cropped, flattened, and converted to jpg.