SuWt 2 is a planetary nebula viewed almost edge-on[2] in the constellation of Centaurus. It is believed that high UV radiations from an undiscovered white dwarf ionizes this nebula. Currently, there is a binary system consisting of two A-type main-sequence stars whose radiations are not enough to photo-ionize the surrounding nebula.[3] The nebula is easily obscured by the brighter star, HD 121228.

SuWt 2

Emission nebula
Planetary nebula
Image of SuWt 2 taken from the Cerro Tololo Inter-American Observatory.
Observation data: J2000 epoch
Right ascension	13h 55m 43.23s
Declination	−59° 22′ 40.03″[1]
Apparent magnitude (V)	11.52[1]
Constellation	Centaurus
Designations	PN G311.0+02.4, DENIS J135543.2-592239, GSC 08676-01161, 2MASS J13554323-5922398, PK 311+02 2[1]
See also: Lists of nebulae

It has been suggested that it has a triple stellar system. One of them, which is more massive than other two A-type main-sequence stars, evolved rapidly and became a red giant, swallowing the other two stars, and produced the planetary nebula.[2]

References

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[ru] Туманность SuWt 2