Leo 1 Dwarf Galaxy ( Jim Lindelien )

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Leo 1 Dwarf Galaxy

Imaging Telescopes Or Lenses: Celestron RASA 11"
Imaging Cameras: ZWO ASI128MC Pro
Mounts: iOptron CEM120EC
Filters: Astrodon Tru-Balance Generation 2 E-Series - L 50mm - NIR Blocked
Accessories: Starizona Microtouch Autofocuser · QHYCCD Polemaster · Baader UFC Filter Slider · Guzila Fanless Mini PC Intel Core i5-5257U · iOptron Tri-Pier 360
Software: Open PHD Guiding Project PHD2 · Pleiades Astrophoto PixInsight · Stefan Berg Nighttime Imaging 'N' Astronomy (N.I.N.A. / NINA) · The ASCOM Initiative ASCOM · darkarchon EZ Processing Suite · Cartes du Ciel · Windows 10 Remote Desktop · Affinity Photo
Guiding Telescopes Or Lenses: Astromania 60mm Guide Scope
Guiding Cameras: ZWO ASI290MM Mini

Dates:: April 10, 2021 · April 11, 2021
Frames:: Astrodon Tru-Balance Generation 2 E-Series - L 50mm - NIR Blocked: 297×60″(4h 57′) (gain: 132.00) -5°C bin 1×1
Integration:: 4h 57′
Darks:: 64
Flats:: 32
Flat darks:: 32
Bias:: 128
Avg. Moon age:: 28.52 days
Avg. Moon phase:: 1.39%
Bortle Dark-Sky Scale:: 4.00
Temperature:: 12.50

RA center: 10h08m47s.809

DEC center: +12°10′58″.80

Pixel scale: 0.999 arcsec/pixel

Orientation: 144.057 degrees

Field radius: 0.609 degrees

WCS transformation: thin plate spline

More info:Open

Resolution: 3608x2490

File size: 8.0 MB

Locations: N. America, Pahrump, Nevada, United States

Data source: Backyard

The Leo 1 dwarf galaxy near Regulus, aka UGC5470.

Rather than dressing the RASA's front-mounted camera's data and power cables in an arc I've installed vanes in a dew shield to attach them to, for that classic reflector diffraction look.

But as is usually done the vanes align parallel to the RA and DEC axes. In the case of Leo 1 and Regulus, this puts a Regulus diffraction flare directly across Leo 1.

Thus, for this image, I rotated the dew shield and vanes 45 degrees to better reveal the dwarf.

---

FOV is a central crop from the 2x drizzle stack. Lacking a full range of HDR exposure times, the rendering of the final appearance of Regulus, its flares, the dwarf, the star fields large and small, and the background galaxies, required preparing over a dozen various masks in PI.

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Celestron RASA
Cooled Color Cams
CMOS Imagers
The OSC Club (One Shot Camera)

	Distinct awarded users	Total awarded images
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Backyard
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Status	Advanced success
Started	...
Astrometry.net job	4410585
PixInsight job	XXYAXHSTEJQCZKK4UVA0248UTNZO49ZS
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	10h08m47s.809
RA (top/left)	10h07m58s.107
RA (top/right)	10h11m17s.198
RA (bottom/right)	10h09m37s.692
RA (bottom/left)	10h06m18s.410

Dec (center)	+12°10′58″.80
Dec (top/left)	+11°36′31″.81
Dec (top/right)	+12°11′47″.37
Dec (bottom/right)	+12°45′25″.89
Dec (bottom/left)	+12°10′05″.63

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