Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  LBN 674  ·  PK138+04.1  ·  Sh2-200
Sh2-200 (HDW 2)  Planetary Nebula near Cassiopeia, Michael Siniscalchi
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Sh2-200 (HDW 2) Planetary Nebula near Cassiopeia

Sh2-200 (HDW 2)  Planetary Nebula near Cassiopeia, Michael Siniscalchi
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Sh2-200 (HDW 2) Planetary Nebula near Cassiopeia

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Description

This nebula was first discovered by the astronomer Stewart  Sharpless in 1959 and included it in his catalogue of HII regions as Sh2-200.
In 1983 Sh2-200 was included in the HDW catalogue (HWD 2) by astronomers Herbert  Hartl, Johann Dengel and Ronald Weinberger as a possible planetary nebula.
In 1987, using narrow band imagining, Herbert Hartl and Ronald Weinberger detected a large faint outer halo extending further than the central shell.
In 2017 it was confirmend to be a planetary nebula when spectra was taken as part of professional observations.
The popular name is the Bearclaw Nebula.

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Sh2-200 (HDW 2)  Planetary Nebula near Cassiopeia, Michael Siniscalchi

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Nebula