Michael A. Stecker


Simesis-147 (Sh2-240)
This is a black and white image of Simesis-147 (Sharpless-240). It is one of the largest
and faintest objects in the sky covering an area of 3 degrees (6 full moons). It is a
supernova remnant not far from the Crab Nebula (M1) in Taurus. Like other SNR's it
has a complex filamentary structure and radio source. It was discovered in the early
1950's at the Crimean Astrophysical Observatory. This image shows the southern third
of the object.
Photographic Data: An Astrophysics 130 mm f/6 EDF refractor that was telecompressed
to f/4.5 was used with a red (25A) filter and hypersensitized Kodak Technical Pan (35 mm)
film. A single 2 hours (120 minutes) exposure was made from Mt. Pinos, California USA
while centered at RA 06 hrs, 32 min and Declination +22.5 degrees. The field of view is
1.2 x 0.8 degrees and north is up. Image processing was done in the computer with
Adobe Photoshop software.