Called SN 2002cx, it is considered the most peculiar type Ia supernova ever observed.

FORBES: When A Supernova ... Fizzles

The observations also show for the first time that a white dwarf can create a cavity around it before blowing up in a Type Ia event.

FORBES: NASA Reveals the Mysteries of the First Known Supernova

Standard Type Ia supernovae are binary systems in which a white dwarf star draws so much matter from its companion (often a red giant) that it undergoes a kind of energy overload and detonates.

FORBES: When A Supernova ... Fizzles