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Type: supernova remnant, S
Mag: B=?, V=?
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"The Outer Rings of SN 1987A". arXiv:1008.3387v1
Supernova 1987A in the Large Magellanic Cloud offered the opportunity due to its proximity to be monitored from its explosion till today. It is one of the few supernova explosions that its progenitor star had been observed prior to the explosion. The presence of the triple ring system that surrounds the debris of the explosion gives a unique opportunity to check the models of the late stages of stellar evolution. The two outermost rings are roughly three times larger than the inner ring oriented north and south of the supernova, thus forming an hour-glass structure, and the inner most ring surrounds the supernova. A possible explanation for the formation of the rings is that they were formed due to interaction from the wind of the progenitor star with gas that was released from the star at earlier stages of its evolution in the form of assymetric wind-like structure.
The ring system on SN 1987A was first detected in the form of [O III] 310 days after the explosion ... the discovery led to further observations using ground-based telescopes and with the HST. ... The outer rings [OR] have not been studied in the same detail as the ER [equatorial ring; inner ring] due to their low surface brightness. Maran et al. (2000) found that the surface brightness of the OR is only about 5-15% of that of the ER. .. The OR extend about 2.5 arcsec to the north and 2 arcsec to the south from the supernova.
The Messier objects
The Bennett objects
The Caldwell list
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