Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  12 Cas  ·  LBN 592  ·  LBN 593  ·  LDN 1282  ·  LDN 1283  ·  Sh2-173  ·  The star 12Cas
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Sh2-173 Emission Nebula in Cassiopeia - The Phantom of the Opera, Andrei Gusan
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Sh2-173 Emission Nebula in Cassiopeia - The Phantom of the Opera

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Sh2-173 Emission Nebula in Cassiopeia - The Phantom of the Opera, Andrei Gusan
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Sh2-173 Emission Nebula in Cassiopeia - The Phantom of the Opera

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Description

Due to its resemblance to the mask of the main character of Andrew Lloyd Webbers musical the nebula is often called the "Phantom of the Opera" nebula.SH2-173 is a HII region (interstellar hydrogen cloud in which star formation has recently taken place) with a diameter of 77 light years, approximately 8.800 light-years away from Earth. It is located in the constellation of Cassiopeia in the Perseus arm, one of the main arms of our Milky Way. SH2-173 is still expanding at a speed of about 16km/s and is hosting 46 young star objects.

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Sh2-173 Emission Nebula in Cassiopeia - The Phantom of the Opera, Andrei Gusan