science & techESA/Hubble2014 · Cetus constellation

A Hubble image of a spiral galaxy holds a supernova that was caught by two independent sky surveys

the gist

This Hubble Picture of the Week shows NGC 337, a barred spiral galaxy about 60 million light-years away in the constellation Cetus. The image blends two wavelengths, with the golden centre made of older stars and the blue outer arms lit by young hot stars. Among those blue stars sat SN 2014cx, a supernova discovered almost simultaneously by the amateur hunter Koichi Itagaki and by ASAS-SN, a network of robotic telescopes that scans the sky for sudden events. Researchers classed it as a Type IIP supernova, meaning the star was a supergiant at least eight times the Sun's mass. Its brightness levelled off into a plateau for weeks or months before fading. The star's core could no longer produce enough energy to resist gravity, and it collapsed in a violent explosion.

so what

Supernovae are how massive stars die and scatter the heavy elements that later form planets and people. Catching one with two independent methods shows how automated surveys now find these events alongside amateur observers.

ESA/Hubble · CC BY 4.0

Image: ESA/Hubble & NASA, C. Kilpatrick