Cave Nebula and surrounding nebulosity (Sh2-155)
Size: about 60'
RA: 22h 56m 48s
Dec: 62 degrees 37' 00"
The Cave Nebula is a faint region of
Ha emission and surrounding dust in the constellation
Cepheus. This area is rich in detail, which is especially
prominent when imaging in Ha light. In addition to the central
"cave-like" structure, notice the subtle patch of blue reflection
nebulosity in the upper right hand portion of the field. The star
colors are also beautiful in this field, which adds a nice touch to the
overall image. Make sure to view the higher magnification image
for full detail.
Date: November 1, 2004
Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy
Autoguider: SBIG STV with
Ha filter (13 nm bandpass); Type II R, G, B filter set.
16 x 5' for Ha (80
minutes total, unbinned); 4 x 4' each for R, G, and B (16 minutes total
for each color), all unbinned.
Conditions: Temperature 42 degrees F; above average
transparency; average seeing; calm.
Post-processing: No darks,
flats, or bias frames used. Alignment done in ImagesPlus.
combined using RC Sigma Reject Plug-in for MaximDL. DDP was
performed in ImagesPlus
levels and curves adjustments in Photoshop CS (16 bit format). Ha
was combined with RGB using the technique of Luminance
note: Graphics on this website
may not be reproduced without author permission.
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