iPTF14hls is an unusual supernova star that has erupted continuously for about 1,000 days before becoming a remnant nebula. It had previously erupted in 1954. None of the theories nor proposed hypotheses fully explain all aspects of the object.

Discovered: September 2014

Distance to Earth: 509.5 million light years

Apparent magnitude (V): 17.716

Constellation: Ursa Major

Coordinates: RA 9h 20m 34s | Dec +50° 41′ 47″