Observation by Alan Thomas: NGC129 Open Cluster in Cassiopeia

Uploaded by

Alan Thomas

Observer

Alan Thomas

Observed

2022 Oct 06 - 22:18

Uploaded

2022 Oct 11 - 11:19

Objects

NGC129

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Constellation

Cassiopeia

Field centre

RA: 00^h29^m
Dec: +60°13'
Position angle: +179°31'

Field size

0°41' × 0°41'

Equipment

42cm CDK17 corrected Dall-Kirkham f/6.8
FLI ProLine KAF-09000 camera
10Micron GM4000 mount

Exposure

120sec.

Location

Observatorio del Teide, Tenerife

Target name

NGC129 Open Cluster in Cassiopeia

Title

NGC129 Open Cluster in Cassiopeia

About this image

Another look at this loose open cluster, this time using the COAST in Tenerife. The cluster 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.

The most obvious feature is the triangle of mag. 8/9 stars near the centre of this image. The star at the bottom 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 stars at centre right (HD236449, HD236446) are both class K stars. The bright star at the top of the frame (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/

Files associated with this observation

COAST NGC129 (2).jpg (532.9 kB)

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