IK Pegasi
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IK Pegasi is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 154 light years from the Solar System.
The Helix Nebula is being created by a star evolving into a white dwarf. NASA & ESA image.
Near-Earth supernova
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A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth, less than roughly 10 to 300 parsecs away, to have noticeable effects on its biosphere.
IK Pegasi
…about 31 million kilometres or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun. IK Pegasi B is a progenitor for a near-Earth supernova, although it is not the nearest supernova progenitor, which is Wolf 1130. When the primary begins to evolve into a red giant, it is expected to grow…
The Crab Nebula is a pulsar wind nebula associated with the 1054 supernova. It is located about 6,500 light-years from the Earth.
G299 Remnants Super Nova Type 1a 20150218