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Clavius and friends at the lunar south

Clavius and neighboring southern impacts Clavius and neighboring southern impacts ©2016 Frederick Steiling
Target Information
Main Target Designation(s) Clavius
Companion Object(s) Moretus, Blancanus, Porter, Rutherfurd, Cysatus, Gruemberger
Additional Images
Published image Full resolution
Annotated image Full resolution
Exposures
IR filtered monochrome 267 x 2.407ms at 85% gain
Video source 5% of 4' video at 108 fps (avg)
Capture resolution 800x800
Date(s) of acquisition 09Dec2016 at 00:29
Location Whiteside, MO
Equipment
Imager ZWO ASI120MM
Telescope/Lens Orion 8" f/3.9 Astrograph
(f/15.8 as configured)
Mount Celestron CGEM
Focuser Moonlite 2" Newtonian CR
Accessories
Coma Corrector None
Collimator 2" Howie Glatter @ 650nm
Focusing Moonlite Mini V2 High-res Controller
Magnifiers Televue 2" Powermate 4x
Software
Acquisition FireCapture 2.4
Guiding None
Processing AutoStakkert 2, Registax 6, PixInsight 1.8

I have finally completed setting up my full lunar/planetary imaging train with proper spacers and a filter wheel, and chose to attempt a close-up image of a neat southern region of the moon that is simply littered with ancient impacts.

Serving as a focus of the image is the large crater Clavius, which measures a sizable 225km/136mi in diameter, enough to fit the state of Connecticut with room to spare!  It's easy to forget -- even on close-up images like this -- how large the moon and many of its features really are!

On this night, seeing was below average, as evidenced by huge atmospheric "waves" running over the frame throughout the capturing duration.  To help counteract this, I used an IR filter which blocks a significant portion of the visible spectrum, letting through wavelengths primarily between 742nm and 1100nm.  The IR band is less affected by these atmospheric distortions than is seen in the visible spectrum, thereby allowing my "small" 8" aperture to cut through the mud and get a respectably clear photo of this busy lunar region.

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