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{{Orphan|date=December 2016}}{{ Planetary nebula |
| image =
|caption=Image of SuWt 2 taken from the Cerro Tololo Inter-American Observatory.
| name = SuWt 2
| type = -
| epoch = J2000
| ra = {{RA|13|55|43.23}}
| dec = {{DEC|-59|22|40.03}}
| constellation = Centaurus
| distance = 6,500 light years
| appmag_v = 11.52
| names = PN G311.0+02.4, DENIS J135543.2-592239, GSC 08676-01161, 2MASS J13554323-5922398, PK 311+02 2
}}{{Sky|13|55|43.23|-|59|22|40.03|3300}}SuWt 2 is a planetary nebula viewed almost edge-on[4] 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.[5]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.[4] References1. ^1 2 {{cite web|title=White Dwarf Lost in Planetary Nebula|url=http://hubblesite.org/newscenter/archive/releases/2008/21/full/|website=HubbleSite|accessdate=December 12, 2016}}
2. ^1 {{cite journal | last1=Danehkar | first1=A. | last2=Parker | first2=Q. A. | last3=Ercolano | first3=B. | date=2013 | title=Observations and three-dimensional ionization structure of the planetary nebula SuWt 2 | journal=Mon. Not. R. Astron. Soc. | volume=434 | issue=2 | pages=1513–1530 | doi=10.1093/mnras/stt1116 | bibcode=2013MNRAS.434.1513D|arxiv = 1307.2974 }}
}}See also 1 : Planetary nebulae |