Time Travel Research Center © 2005 Cetin BAL - GSM:+90 05366063183 - Turkey / Denizli
Cave Nebula and surrounding nebulosity (Sh2-155)
Characteristics:
Magnitude: ?
Size: about 60'
Distance: ?
RA: 22h 56m 48s
Dec: 62 degrees 37' 00"
Description:
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.
Photographic Details:
Date: November 1, 2004
Scope: Takahashi Sky 90 at f4.5 with field flattener/focal reducer, on the
G11 Losmandy Mount.
Autoguider: SBIG STV with e-finder.
Camera: SXV-H9
Filter: Astronomik Ha filter (13 nm bandpass); Type II R, G, B filter set.
Exposures: Ha:(HaR:G:B). 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. Sigma combined using RC Sigma Reject Plug-in for MaximDL. DDP
was performed in ImagesPlus (IP). Subsequent levels and curves adjustments
in Photoshop CS (16 bit format). Ha was combined with RGB using the
technique of
Luminance Corrected RGB.