Astral Imaging at Dogwood Ridge Observatory

Latitude: 3748'51.0" N"
Scottsville, Virginia 24590


(click on thumbnails to go to that image's page)






Image Information

Quoted from APOD:

Explanation: Found among the rich starfields of the Milky Way toward the constellation Cassiopeia, star cluster NGC 7789 lies about 8,000 light-years away. A late 18th century deep sky discovery of astronomer Caroline Lucretia Herschel, the cluster is also known as Caroline's Rose. Its suggestive appearance is created by the cluster's nestled complex of stars and voids. Now estimated to be 1.6 billion years young, the galactic or open cluster of stars also shows its age. All the stars in the cluster were likely born at the same time, but the brighter and more massive ones have more rapidly exhausted the hydrogen fuel in their cores. These have evolved from main sequence stars like the Sun into the many red giant stars shown with a yellowish cast in this lovely color composite. Using measured color and brightness, astronomers can model the mass and hence the age of the cluster stars just starting to "turn off" the main sequence and become red giants. Over 50 light-years across, Caroline's Rose spans about half a degree (the angular size of the moon) near the center of the wide-field telescopic image.


Edited Quoted from

Discovered by Caroline Herschel in 1783.

When Caroline Herschel discovered this cluster in fall 1783, she included it in her small private list as entry No. 14. Her brother William included it in his catalog as H VI.30.

This cluster has been classified as of Trumpler type II 2 r.













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All Data acquired using ACP Expert

NGC7789 Imaged Linked in TheSky X

This image consists of unbinned luminance data and RGB data that is binned 2X2. The luminance data is 29 - 15 minute frames (7-1/4 hours) and there are 44 RGB frames each 15 minute each (11 hours) with 4-3/4 hours red, 2-3/4 hours green, and 3-1/2 hours blue. Image processed in Pix Insight. Data acquired using ACP Scheduler and MaxIm 5.24.

Equipment and Location Information

Date July 18, 2015- Jan. 10, 2016
Location Dogwood Ridge Observatory
Optics Optical Guidance Systems 12.5" RC @f/9
Mount Astro Physics AP1200GTO
Camera SBIG STL-11002M/CW8
Filters Baader LRGB Ha 7nm,SII 8nm, OIII 8.5nm - 50.8mm Unmounted Filters
Conditions Temperature low to mid 50s - 60s with moderate to good  seeing. Transparency good.

  Last Modified :10/02/12 01:10 PM