Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  PK136+04.1  ·  PK136+05.1
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HFG1 & Abell 6 in HOO, Carlos Uriarte
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HFG1 & Abell 6 in HOO

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HFG1 & Abell 6 in HOO, Carlos Uriarte
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HFG1 & Abell 6 in HOO

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This is my last image. 
Heckathorn-Fesen-Gull 1 (HFG1) and Abell 6 are a duo of planetary nebulae from the constellation Cassiopea.
The central star of HFG1 is a 14.5 mag binary star. It leaves behind a gas tail of at least 20 '. She is said to be around 10,000 years old.
The structure of HFG1 presents an arc of a circle opposite the tail, in the direction of movement of the nebula, which suggests that it is a shock wave front of matter interacting with the interstellar medium.

Abell 6 is an example of a bubble-shaped planetary nebula. However, it remains quite faint (Mag = 15). It emits more in OIII than in Ha.

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    HFG1 & Abell 6 in HOO, Carlos Uriarte
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  • HFG1 & Abell 6 in HOO, Carlos Uriarte
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HFG1 & Abell 6 in HOO, Carlos Uriarte