The Monoceros Loop in Hydrogen Alpha
Characteristics:
Size: Approximately 9 x 7 degrees.
Distance: 5500 light years (Rosette Nebula)
RA: 6h 31m
Dec: 4 degrees 57' 00"
Description:
The Monoceros Loop is a faint supernova remnant that contains the
Rosette Nebula (bottom) as well as the Cone Nebula (top, left of
center). The nebulosity within this region is very faint but
easily captured in this wide field view. This is a composite
photograph consisting of a wide field shot taken with a 50mm Canon
lens, combined with two high resolution views of the Rosette and Cone Nebulae
regions, respectively (Sky 90), all taken with the SXV-H9 CCD camera in
Ha light.
Photographic Details:
Date: March 29, 2004 for wide field view (please see above links
for details regarding the Rosette and Cone images).
Lens (widefield view): Canon 50mm f/1.8 FD lens, stopped down
to f5.6. Adapter for connecting lens to SXV-H9 was "homemade,"
using
a FD lens-C mount and asking a local machine shop to create a C to T
adapter.
Please see Doc G's site
for details. It's important to maintain a CCD chip to lens
distance of 42mm for Canon FD series lenses in order to achieve
infinity focus.
I believe that similar adapters may be commercially available
through
Adirondack Video.
Autoguider: STV with e-finder.
Camera: SXV-H9.
Filter: Astronomik Ha.
Exposures: 40 x 2' for a total of 80'
exposure.
Conditions: Temperature 34 degrees F;
average transparency; above average seeing; calm.
Post-processing: No dark or bias frames used. Auto-aligned in MaximDL;
Sigma combine using RC Sigma Reject MaximDL. Levels and curves adjustments in Photoshop
CS. Composite constructed in Registar.
Please
note: Graphics on this website may not be reproduced without
author permission.
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