M33: The Triangulum Galaxy

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The Triangulum Galaxy is a spiral galaxy approximately 3 million light years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598, and is sometimes informally referred to as the Pinwheel Galaxy, a nickname it shares with Messier 101. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, which includes the Milky Way, the Andromeda Galaxy and about 44 other smaller galaxies. It is one of the most distant permanent objects that can be viewed with the naked eye.
Under exceptionally good viewing conditions with no light pollution, the Triangulum Galaxy can be seen with the naked eye. It is one of the most distant permanent objects that can be viewed without the aid of a telescope. Being a diffuse object, its visibility is strongly affected by small amounts of light pollution. It ranges from easily visible by direct vision in dark skies to a difficult averted vision object in rural or suburban skies. For this reason, Triangulum is one of the critical sky marks of the Bortle Dark-Sky Scale.

Imaging telescopes or lenses: Celestron C11 XLT, TEC 140
Imaging cameras: QSI 583 wsg
Mounts: Losmandy G11 , Sky-Watcher NEQ6
Guiding cameras: The Imaging Source DMK21AU618.AS
Filters: Baader LRGB 1.25” Filters, Custom Scientific H-Alpha 4.5nm
Dates: Oct. 7, 2013
Locations: Home observatory
Frames:
Astrodon E-series LRGB: 74×300″ -15C bin 1×1
Baader Ha 1.25″ Filter 7nm: 60×200″ bin 1×1
Baader LRGB 1.25” Filters: 90×60″ bin 1×1
Integration: 11.0 hours
Darks: ~10
Flats: ~10
Bias: ~100

Autor: Andre van der Hoeven, Michael van Doorn

AstroPhotography of the day by SPONLI

10 January 2014

We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.