M81 in Ursa Major
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ON IMAGE FOR FULL SIZE VIEW (2800x2100)
Scope:
Celestron 9.25 Edge 235 mm at f/7, Location: DAA Observatory,
Shelter Valley, CA, 3 Feb 2018
Camera: ST8300M (Baader LRGB filters) Exposure:
Exposure: 24 x 12 min (2x2 bin) exposure with IR/UV Block filter, 12 x 4.5 min (2x2 bin) RGB exposures. Processing: Data
Collection - Sequence Generator Pro (as FITs). Calibrated, stacked
(Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration,
equalization - Astroart. Curves, Levels, RGB
combine - ImagesPlus. Luminance Layering, final stretch, and finishing -
Photoshop. RGB calibration - eXcalibrator. This image is a RGB combine
with Luminance layering. Color saturation in LAB color. The IR/UV Blocking filter exposure stack
was used for the
luminance layer. High pass sharpening applied. Images processed at 3352 x 2532 resolution. Final Image size is approximately
2800 x 2100. North is up in this image.
This field is M81 and the surrounding region. The irregular dwarf, UGC 5336,
is left of M81 - it is a satellite of M81 and is thought to be the youngest
nearby galaxy. M81 is an Active Galactic Nucleus (AGN) galaxy. It is well
studied and cataloged. There are over 2,500 cataloged galactic objects within
its confines in the SIMBAD database - many are listed as
"unknown" for object type. The annotated image shows the brightest
globular cluster and brightest HII region. There are several distant background
galaxies in this field as well. The two bright stars below and to the
right of M81 are really both double stars. BD+69 541A,B are an obvious double
and are resolved in the image at about 9.55 arc seconds separation. These
are likely a pair since they are also high proper motion stars with very
similar velocity vectors. The other double is HD 85458A,B and is unresolved in
the image. Their separation is less than a one arc second These galaxies and
stars are identified in the annotated
image.. This image replaces an earlier image that can be
seen in the Archives here. Horizontal FOV is
approximately 38 arc minutes. Image center is located approximately - Equatorial 2000: RA: 09h 55m 33s Dec: +69°04'00"
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