Supernova Remnant Simeis 147 on Auriga/Taurus Border
A Work Forever In Progress! Faint, but Huge!
This is a very faint object swamped by the rich star fields along the border of Auriga and Taurus. This is a mosaic of three frames using a full frame SBIG STL-11002XM camera and a Takahashi FSQ106EDXIII astrograph reduced to 385mm focal length at f/3.6. To date, only Ha frames have been processed and stitched together. Note how large an area this super nova remnant subtends on the night sky in comparison to the full moon, here added digitally for scale! Were only human eyes sensitive to the light of hydrogen alpha emission, we would readily see this knotted skein of fibrous tendrils glowing large in the night sky on moonless nights. As it is, the object is invisible to the eye even in telescopes! It bears the name Simeis147 or Simeiz147 from its entry in a catalogue compiled by the Crimean Astrophysical Observatory, located at Simeis in the Ukraine, at which it was discovered. Despite its huge apparent size on the night sky, it is so faint, and so ensnarled in the rich field of stars surrounding it, that it was discovered on red-sensitive photographic plates only in 1952! It is the expanding remnant of a star which exploded some 40,000 years ago and harbors a pulsar at its core. It is some 3,000 light years distant from earth.
Ha 3 panel Mosaic
Altitude at culmination 74°
Minimum Airmass Value (sec z) 1.0
Taking Camera SBIG STL-11002XM
Nova Scotia Winter 2014, ~mag 6.4 - @-20C
Takahashi FSQ106EDXIII with 0.73 Reducer
Equivalent focal length and ratio
Ha 3 panel Mosaic
Ha 25X30min Center, 22X30 min each East&West, Astrodon 5nm Ha Filter. Binned 1X1
Calibration and Stacking
Darks, Flats and Bias - Stacked and calibrated with PixInsight
PixInsight, Adobe Photoshop CS4 and Bob Franke's CCDBand-Aid
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