SNR G111.7-02.1 Cas A Supernova Remnant (Robert.S)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

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SNR G111.7-02.1 Cas A Supernova Remnant

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SNR G111.7-02.1 Cas A Supernova Remnant

Cassiopeia A (Cas A) is a supernova remnant (SNR) in the constellation Cassiopeia The supernova occurred approximately 11,000 light-years (3.4 kpc) away within the Milky Way. The expanding cloud of material left over from the supernova now appears approximately 10 light-years (3 pc) across from Earth's perspective. In wavelengths of visible light, it has been seen with amateur telescopes down to 234mm (9.25 in) with filters.It is estimated that light from the stellar explosion first reached Earth approximately 300 years ago, but there are no historical records of any sightings of the supernova that created the remnant, although it is possible that it was recorded as a sixth magnitude star 3 By John Flamsteed on August 16, 1680. Another suggestion from recent cross-disciplinary research is that the supernova was the mythical "noon day star", observed in 1630, that heralded the birth of Charles II, the future monarch of Great Britain

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SNR G111.7-02.1 Cas A Supernova Remnant

SNR G111.7-02.1 Cas A Supernova Remnant

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SNR G111.7-02.1 Cas A Supernova Remnant

SNR G111.7-02.1 Cas A Supernova Remnant

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