18  August  2018
Simeis 147, The Spaghetti Nebula


By Ron Brecher

Simeis 147 is known as the Spaghetti Nebula, and is a member of the Sharpless Catalogue (Sh2-240).
It is a supernova remnant, produced by the explosive death of a large star about 40,000 years ago.
 The shock waves that resulted from the supernova explosion cause the gases to glow – hydrogen in red; oxygen in teal. This object is about 3,000 light years away and is expanding.
 Currently it is about 150 light years across, covering about 3 degrees of sky (6 times the Moon’s width).
 A pulsar near the centre of this complex is all that is left of the progenitor star.
Pulsars are rapidly spinning neutron stars that appear to blink on and off as seen from earth.
 Moravian G3-16200 EC camera (on loan from O’Telescope), Optolong Ha, O3, R, G and B filters,
 Takahashi FSQ-106 ED IV at f/3.6, Paramount MX, unguided.
Acquisition with the SkyX, focused with FocusMax. All pre-processing and processing in PixInsight.
Acquired from my SkyShed in Guelph. Gibbous to full moon for Ha, new to crescent moon for O3 and RGB. Average or better transparency and seeing.
Acquired September 21 – November 21, 2017.
 51x5m R, 48x5m G, 49x5m B, 29×10 Ha and 29x10m O3 unbinned frames (total=22hr). 


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