supernova impostor

Its earlier brightening was a supernova impostor event.

The supernova impostor phenomenon may represent a surface instability or a failed supernova.

It was a 'supernova impostor' or 'failed supernova'.

SN 1961V was an abnormal, supernova-like event that was a potential supernova impostor.

Eta Carinae's chief significance for astrophysics is based on its giant eruption or supernova impostor event, which was observed around 1843.

Supernova impostors are stellar explosions that appear at first to be a type of supernova but do not destroy their progenitor stars.

Two years earlier, the progenitor star produced a supernova impostor that was detected by Japanese amateur astronomer Koichi Itagaki.

Supernova impostors appear as remarkably faint supernovae of spectral type IIn-which have hydrogen in their spectrum and narrow spectral lines that indicate relatively low gas speeds.

Giant eruptions observed in a few LBVs do increase the luminosity, so much so that they have been tagged supernova impostors, and may be a different type of event.

One supernova impostor that made news after the fact was the one observed on October 20, 2004, in the galaxy UGC 4904 by Japanese amateur astronomer Koichi Itagaki.

Analysis of the reflected spectra indicated the light was emitted when Eta Carinae was a 5000 K G2-to-G5 supergiant, some 2000 K cooler than other supernova impostor events.