description RCW 86 Overview
RCW 86 is a large supernova remnant in the southern constellation Circinus, approximately 8,200 light-years from Earth. It is widely associated with SN 185, a transient 'guest star' recorded by Chinese astronomers in 185 CE, making it one of the oldest supernovae for which a written record survives. Observations by the Chandra X-ray Observatory and other instruments indicate the remnant resulted from a Type Ia supernova whose blast wave expanded rapidly through a low-density cavity. The remnant spans roughly 90 light-years.
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What is RCW 86 in astronomy?
RCW 86 is an expanding cloud of gas and dust classified as a supernova remnant. It is located in the southern sky and is the debris left behind by an exploding star.
Why is RCW 86 famous in astronomical history?
It is widely considered the candidate for the oldest recorded supernova, as it is linked to a "guest star" observed by ancient Chinese astronomers in the year 185 CE. The records describe a star that appeared suddenly and stayed visible for months.
Where in the night sky can you find RCW 86?
The remnant is located in the southern constellation of Circinus, near the constellation Centaurus. It is not visible to the naked eye today and requires powerful telescopes to observe its faint filaments.
How did RCW 86 form?
RCW 86 was created when a white dwarf star at the end of its life underwent a thermonuclear explosion, a process known as a Type Ia supernova. The shockwave from this ancient explosion continues to plow through interstellar space.
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