description Hb 5 (Hubble 5) Overview
Hb 5, also known as Hubble 5, is a planetary nebula in the constellation Sagittarius. It is recognized for a strongly bipolar form, in which opposing lobes extend from a denser central region, and for a prominent dark band produced by dust near the nebular waist. The structure is interpreted as the result of directional mass loss during the late stages of stellar evolution. Hb 5 is studied in astronomy as an example of an asymmetric planetary nebula.
help Hb 5 (Hubble 5) FAQ
What is Hubble 5?
Hubble 5, also designated Hb 5, is a bipolar planetary nebula in the constellation Sagittarius. Its two-lobed shape and narrow central waist make it one of the more striking examples of an hourglass-like nebula.
Who discovered Hb 5?
Edwin Hubble discovered Hubble 5 from astronomical photographic plates in the early 1920s, commonly dated to 1921. The object is named after Hubble because of that early identification, not because it was discovered by the Hubble Space Telescope.
Why does Hubble 5 have a bipolar shape?
The nebula's material is concentrated into two opposing lobes separated by a dense central region or dust lane. Such structures are associated with directed outflows from the dying star and interactions within the central stellar system.
Is Hubble 5 the same as a galaxy discovered by Edwin Hubble?
No. Hb 5 is a planetary nebula in the Milky Way, while Edwin Hubble is also famous for work on galaxies and cosmic expansion. The Hubble 5 name refers specifically to this compact nebula in Sagittarius.
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