Initially conceived as a 2 panel mosaic, this image ended to be a single panel, because of the persisting cloudy weather in this winter 2022-2023, that prevented the project to be completed in the following three months. Data was recorded on 25 October, 2 and 5 November 2022, and processed on 4 February 2023.
Simeis 147 (aka Sh2-240, LBN822, SNR 180.0-01.7 or Spaghetti Nebula) is a faint Supernova Remnant occupies a large portion of the sky with a diameter of six full moons, equivalent to 3 degrees.
Its signal is extremely weak, mostly in Ha, and is not visible in my individual sub-exposures.
The stellar debris is estimated to be 150 light-years wide at a distance of 3,000 light-years from earth.
The supernova explosion happened 100000 years ago and left behind not only the expanding remnant but also a spinning neutron star (a pulsar) named PSR J0538+2813, whose position is indicated in the annotated version of the image, close to the top edge of the picture.
Its structure reminds me vaguely
Sh2-114 in Cygnus.
I always think to SIM 147 as an object pertaining to Auriga; in reality it sits exactly across the Auriga-Taurus border. In particular, the southern portion presented here is entirely in the constellation of Taurus.
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