SH2-173 (The Phantom of The Opera Nebula) (Randal Healey)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: The star 12 Cas

SH2-173 (The Phantom of The Opera Nebula), Randal Healey

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SH2-173 (The Phantom of The Opera Nebula)

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SH2-173 (The Phantom of The Opera Nebula)

SH2-173 is a HII region with a diameter of 77 light years, approximately 8800 light-years away from Earth. It is located in the constellation of Cassiopeia in the Perseus arm, on of the main arms of our Milky Way.

Due to its resemblance to the masked main character of Andrew Lloyd Webbers musical, the nebula is often called the "Phantom of the Opera" nebula.

SH2-173 is about 3 degrees north of Caph (β-Cas, mag 2,27) and was estimated to be about 600,000 to 1,000,000 years old. The emission nebula contains 7 bright CAS-OB5 stars and is primarily ionized by the only O-star BD+6039. It turns out that SH2-173 is still expanding at a speed of about 16km/s. SH2-173 is harboring 46 young star objects.

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SH2-173 (The Phantom of The Opera Nebula)

SH2-173 (The Phantom of The Opera Nebula)

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SH2-173 (The Phantom of The Opera Nebula)

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