NGC7789 Caroline's Rose (Rob Johnson)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: NGC 7789

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NGC7789 Caroline's Rose

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NGC7789 Caroline's Rose

With a near full Moon in the sky what can we image? Well narrowband Ha is an option or a star cluster far enough away from the Moon. So here is NGC7789, a favourite of mine from visual observing where it appears as a dense cluster of stars under low power.

A short series of exposures in LRGB partly to test my latest collimation with an Autocollimator. I have found that very tiny miscollimation with the TSGPU coma corrector gives assymetric flat fields, much to my frustration over the past few months so much so that I will change to the TS Maxfield coma corrector which has a shorter barrel length and thus less vignetting to be corrected.

Discovered by Caroline Herschel of course in 1783, the cluster is some 7,600 ly distant and around 55 ly across composed of many red giant stars which give the stars a yellowish colour.

Light Polluted skies
CMOS Imagers
Broadband under Bortle 7/8/9
Imaged with N.I.N.A.
N.I.N.A. Users
Reflecting Telescope Group
Open Star Clusters
Suburban Astrophotography
UK Astro-Imaging
QHY268M/ZWO2600M Images

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Status	Basic success
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Astrometry.net job	6900009
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PixInsight queue size	n/a
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NGC7789 Caroline's Rose

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