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Instrument |
12.5" RCOS @
~f/9 (2880 mm fl) 0.64 arcsec / pixel. The Zoomify image scale
is 0.80 to 3.20 arcsec / pixel. |
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Mount |
Paramount ME |
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Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Filters |
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Acquisition Data |
9/11/2010 to 10/1/2010 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
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Exposure |
Lum (no filter) 225 min (15 x 15 min, bin 1x1)
RGB
315 min ( 7 x 15 min each, bin 2x2)
Ha
480 min (16 x 30 min, bin 1x1)
OIII
510 min (17 x 30 min, bin 1x1)
L [R+ha] [G+OIII] [B+OIII]
Click
here for the color mapped narrowband
image.
Click here for the B & W Ha filter image |
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Software |
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CCDSoft, CCDStack,
Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions.
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eXcalibrator for (b-v), (v-r) color calibration, using 12 stars
from the NOMAD1 database.
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PixFix32 (pre-beta) to
repair column defects.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures and LRGB
color.
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PhotoShop for LRGB
plus Ha
combine &
on-linear stretching. The Ha data was added to the LRGB's
red channel and OIII to the green and blue using the lighten option for opacity.
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Comment |
North is to the top.
Sh2-155, The Cave
Nebula, is a faint area of Ha emission and dust in the constellation
of Cepheus. The nebula gets is name from the darker area, at the
center left, which visually appears as a cave. This highly stretched
image brightens the cave and shows some of its structure.
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