description HB 9 Overview
HB 9 is an ancient supernova remnant in the constellation Cassiopeia, notable for its large angular diameter and estimated age of roughly 5,000 years.
help HB 9 FAQ
What is HB 9?
HB 9 is an ancient supernova remnant in the constellation Cassiopeia. It is known for its large angular diameter on the sky.
How old is the HB 9 supernova remnant?
HB 9 is estimated to be roughly 5,000 years old. That figure is an estimate rather than an exact historical date.
Where can HB 9 be found?
HB 9 is located in the constellation Cassiopeia. It is an extended remnant of a stellar explosion rather than a point-like star.
What does HB 9 look like astronomically?
HB 9 has a large angular diameter, meaning it covers a broad apparent area in the sky. Its structure comes from expanding debris left by an ancient supernova.
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