Observation by Peter Goodhew FRAS: Sh2-176

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Peter Goodhew FRAS

Observer

Peter Goodhew FRAS

Observed

2024 Oct 24 - 10:50

Uploaded

2024 Nov 01 - 10:53

Objects

Sharpless 176

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Constellation

Cassiopeia

Field centre

RA: 00^h31^m
Dec: +57°22'
Position angle: +2°34'

Field size

0°35' × 0°33'

Equipment

APM TMB LZOS 152 refractors
Celestron EdgeHD 14" SCT
QHYCCD QHY600 Pro M camera
QHYCCD QHY268 MM Pro cameras
10micron GM2000 HPS mount
ASA DDM85 mount

Exposure

A total of 33 hours 49 minutes HaOIII

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.
Elmore 3 is a candidate planetary nebula discovered by David Elmore earlier this year.
Image captured on my robotic telescopes in Spain.

Files associated with this observation

Sh2-176 crop.jpg (247.3 kB)

Like this image

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