Observation by Alan Thomas: NGC129 Open Cluster in Cassiopeia

Uploaded by

Alan Thomas

Observer

Alan Thomas

Observed

2022 Sep 23 - 19:58

Uploaded

2022 Sep 25 - 13:06

Objects

NGC129

Equipment

Unistellar eQuinox 112mm reflector.

Exposure

60sec.

Location

Norbreck Observatory, Warrington, Cheshire, UK.

Target name

NGC129 Open Cluster in Cassiopeia

Title

NGC129 Open Cluster in Cassiopeia

About this image

This loose open cluster in Cassiopeia was discovered by William Herschel in 1788. It is set in a rich star field and it is difficult to be sure which stars are and are not members of the cluster. It took me several attempts before I was sure I had located the correct position.

The most obvious feature is the triangle of mag. 8/9 stars at the centre of this image. The star at the top of the triangle (DL Cas) is a binary system containing a Cepheid used to compute the distance of the cluster (not by me, I hasten to add). The pair of bright orange stars at lower left (HD236449, HD236446) are both class K stars. The bright star at lower right (HD2626) is a mag. 5.9 class B star.

Distance c.6,600ly. Age c.76million ly.

Useful reference material for NGC129 can be found at https://www.starobserver.eu/articles/ngc129/ This cluster is actually much more interesting than it first appears.

Bortle 7/8. No Moon.

Files associated with this observation

eVscope-20220923-195752 (2) (1280x960).jpg (724.1 kB)

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David Basey

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