Observation by Alan Thomas: NGC7788, NGC7790 Open Clusters in Cassio...

Uploaded by

Alan Thomas

Observer

Alan Thomas

Observed

2022 Oct 24 - 19:40

Uploaded

2022 Oct 26 - 09:59

Objects

NGC7788
NGC7790

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Constellation

Cassiopeia

Field centre

RA: 23^h56^m
Dec: +61°24'
Position angle: -88°06'

Field size

0°36' × 0°27'

Equipment

Unistellar eQuinox 112mm reflector

Exposure

64sec - I would have said longer, several minutes, but this is the reading the Unistellar gave.

Location

Norbreck Observatory, Warrington, Cheshire, UK.

Target name

NGC7788, NGC7790 Open Clusters in Cassiopeia

Title

NGC7788, NGC7790 Open Clusters in Cassiopeia

About this image

NGC7788 (centre) and NGC7790 (lower right) are an attractive pair of open clusters in Cassiopeia, located in a densely populated region of the sky.

NGC7788 was discovered by John Herschel in Oct 1829. Distance has been estimated at c.7,700ly, and age c.40million years. Apparent mag. 9.0. Class I2p (highly concentrated).

NGC7790 was discovered by William Herschel in Dec 1788. Why he did not also see the nearby (c.15') NGC7788, which is of similar brightness, is a puzzle. Distance estimated at c.9,600ly, and age c.55million years. Apparent mag. 9.0. Class III2p (no concentration - although visually the two clusters do not appear so different to me).

Bortle 7/8, no Moon, light cloud.

Note on sources: I have found Prof. Seligman's awesome website (https://cseligman.com/text/atlas/ngc00.htm - does the guy ever sleep?) very useful for identifying NGC objects and gleaning information about them.

Files associated with this observation

eVscope-20221024-190431 (2).jpg (1.4 MB)

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Callum Potter, David Basey

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