Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  M 22  ·  NGC 6656  ·  PK009-07.1
M22, Geoff
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M22, Geoff
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Description

This is an unguided image of M22, one of the nearer globular clusters to Earth at a distance of about 10,600 light-years away. Its angular size of 32' translates to a spatial diameter of about 100 light years.

M22 is very unusual in that it is one of only four globular clusters that are known to contain a planetary nebula, the others being M15, NGC 6441 and Palomar 6. It was discovered using the IRAS satellite by Fred Gillett et al in 1986 as a pointlike source and subsequently identified as a planetary nebula in 1989.

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