Rich Open Cluster in Cassiopeia

Uploaded 10/30/05

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 The constellation of Cassiopeia is bursting with rich and colorful open clusters begging to be captured with your sensors. A prime example NGC7789 is 6.7 magnitude, and over 15 arcminutes across. Containing over 250 stars, it is a moderately rich cluster complete with a good selection of orange and yellow supergiants, a good many of which are variable stars.

This image readily demonstrates the image quality I can obtain with my f/5 Newtonian and a focal plane coma corrector. Examine the 1600 sized image if you dare, stars and cluster details remain crisp right into the corners.

To the upper right, near the top edge is a very red variable star WY cass. This type M star varies in brightness over a 476 day period from 10th to 17th magnitude and is considered a long period variable. It shows up about half the time on my images over the years of this object, and here we were lucky enough to capture it in a deep red and fairly bright state.

Processing: Three five minute subframes were dark subtracted, flat fielded and then summed and aligned in Maxim DL. Absolutely NO additional noise reduction was used here.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD Camera: Canon 10D @ ISO1600 Exposure: 3 x 5m Filters: None Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 8/10, Transparency 8/10 Outside Temperature: 50F Processing Tools: Photoshop CS, Maxim DL, PixInsight, Canon Raw HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS FastCounter by bCentral