Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)
HFG1 and Abell 6, José Manuel López Arlandis
HFG1 and Abell 6
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HFG1 and Abell 6

HFG1 and Abell 6, José Manuel López Arlandis
HFG1 and Abell 6
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HFG1 and Abell 6

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Description

In the field of photography there are two planetary nebulae. Both are visible in the Cassiopeia constellation, about 4º north of the Soul Nebula and on the border with Draco. The large one, HFG1 (Heckathorn-Fesen-Gull 1), is an old planetary nebula. It is about 10,000 years old. Being close to retirement, he has lost his forms under the influence of interaction with the environment. Its central star is a binary of magnitude 14.5, composed of a white dwarf and a red giant, which rotate around each other in about 14 hours. It is a precataclysmic double star, since the two stars are very close and are getting closer and closer to each other. Both are heading rapidly southeast into the interior of our galaxy. The surrounding gas has a bright and circular shock front, very visible with the OIII filter (blue), while behind it leaves a reddish tail of hydrogen visible in HII, extensive, about 20' of arc, formed by the gas lost by the red giant blown by strong stellar winds. Abell 6 is about 40' arc southwest of HFG1. It is a typical young, bubble-shaped planetary nebula. The OIII signal predominates in it, and the bluish central star is visible. They are faint nebulae, especially HFG1. They require a long exposure to capture their blue tones against the tail and HII cloud background. I took the photo on 12 nights in November and December, with a shorter exposure for the stars in RGB (1h 45m), 17h 25m in HII and 19h 25m in OIII. I did part of the shots in bin x1 and part in bin x 2. Newton Orion UK AG10 tube with Winne 0.95 corrector, and QHY268M camera. The color palette is pure HOO.

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HFG1 and Abell 6, José Manuel López Arlandis