Hen 2-428

Hen 2-428
Emission nebula
Planetary nebula
ESO image of Hen 2-428
Observation data: J2000.0[1] epoch
Right ascension19h 13m 05.239s[1]
Declination+15° 46′ 39.80″[1]
ConstellationAquila
DesignationsHenize 2-428, Hen 2-428,[1] He 2-428, PN G049.4+02.4,[1] M 4-12,[1] ARO 186,[1] PK 49+02 1,[1] IRAS 19108+1541[1]
See also: Lists of nebulae
Star system
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquila
Right ascension 19h 13m 05.239s[1]
Declination +15° 46′ 39.80″[1]
Spectral typeD
Other designations
ESO 228-6, 2MASS J17360694-4925453[1]
Database references
SIMBADdata

Hen 2-428 is a planetary nebula with a binary double white dwarf system core. This core star system is the first discovered candidate for Type Ia supernova through binary white dwarf merger process. At the time of its discovery, the star system at the core was the heaviest known double white dwarf binary star system.

  1. ^ a b c d e f g h i j k l Cite error: The named reference SIMBAD was invoked but never defined (see the help page).