Observation by Peter Goodhew FRAS: Sh2-176

Uploaded by

Peter Goodhew FRAS

Observer

Peter Goodhew FRAS

Observed

2022 Aug 09 - 15:50

Uploaded

2022 Aug 09 - 15:53

Objects

Sharpless 176

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Constellation

Cassiopeia

Field centre

RA: 00^h31^m
Dec: +57°22'
Position angle: +0°40'

Field size

0°32' × 0°23'

Equipment

APM TMB LZOS 152 Refractors
QSI6120 CCD Cameras
10Micron GM2000 HPS mount

Exposure

32 hours 15 minutes total integration (HaRGB)

Location

Fregenal de la Sierra, Spain

Target name

Sh2-176

Title

Sh2-176

About this image

Sh2-176 is a faint planetary nebula in Cassiopeia. It has a surface brightness of 15.5 mag/arc-sec2 and a hydrogen-rich central star. It was discovered to be a planetary nebula by Sabbadin et al in 1977. It is approximately 490 light-years away with estimates for its age ranging from 24,000 to over 180,000 years old based on the computed kinematics (expansion rate and nebular diameter). Expanding at 19 km/sec, Sh2-176 has been estimated to span 3.1 to over 22.8 light-years across depending on the source. Its asymmetricity is believed to be the result of bow shocks involving the interstellar medium and the planetary nebula itself where, the brighter portion of the nebula represents the interaction of the nebula meeting up against the interstellar medium as it moves through space. The central star associated with Sh2-176 is a blue subdwarf with a magnitude of 18.74.
Data captured on my dual rig of 6" refractors at Fregenal de la Sierra in Southern Spain.
Data captured between 4-9 August 2022.
More information at https://www.imagingdeepspace.com/sh2-176.html

Files associated with this observation

Sh2-176 crop.jpg (2.0 MB)

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Mike Harlow, Dominic Ford, Callum Potter, Simon Paul Davis, Dr Paul Leyland, Peter Carson

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