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Dates & Location

12 Sept - 2Oct 2017 from the ICAstro site Alcalali, Spain. Elevation 230 m.
Lat 38°:45.4 N, Long 00°:02.1 W

Catalogue identification

Messier 33
NGC 598

In this image, North is Right.

Equipment Used

AstroPhysics AP155 EDF at 1085 mm focal length, F7.1.
Paramount ME German equatorial Mount.
Camera SBIG STT-8300FWG.
TheSkyX Pro telescope control.
SGP used for camera, PHD Guide and Focus control.

Lakeside Focuser.



Where it is in space

About 4.3° West of Mothallah - the point of the Triangulum constellation. Triangulum is sat betwee the constellations of Andromeda to the North and Aries to the South.


Remote session using SplashTop control from Ravenshead, UK.
Exposures: Lum 10 x 20 min and 20 x 10 min. R:G:B each master 23x10 min. Lum master generated from all images. i.e. 10 x 20 min + 89 x 10 min total.

All sub-exposures
-25°C. All images binned 1x1.
Mainly automated sessions using Sequence Generator Pro (SGP).

  What it is

M33 is an average size standard spiral galaxy, the third largest of the local group that also includes our Milky Way and the Andromeda galaxy. It is pretty close, and as a result the apparent size to the naked eye is 1.5 x the width of the Moon.
It contains ~ 40 billion stars and is ~ 2.8 million light years distant. The blue proliferation is created by the high population of young blue giant stars. The red nebulosity concentrations embedded in the spiral structure are active HII molecular clouds which signify star birth regions.
There is evidence to suggest that at some time in its past it passed close enough to the Andromeda galaxy to create a tidal stream of neutral hydrogen gas and stars and this gives rise to speculation that it may be a satellite to it.

Processing Methods

All data reduction with CCDStack. Lum, RGB masters and RGB colour combine prepared in CCDStack.  
  Colour masters finished using PhotoShop CS6.