NOVEMBER 2015 OBSERVERS CHALLENGE – NGC-7789 

NGC 7789, Open Cluster in Cassiopeia:  Location of observation:  From my moderately light polluted backyard in Western North Carolina 

Observer:  Roger Ivester 
Date: October 7th 2015
Conditions: Good   NELM: 5.2
Telescope: 10-inch f/4.5 Newtonian Reflector
Sketch Magnification: 104x    FOV: 0.79º
Catalogued Magnitude: 6.7

Very bright and rich with well over 120 stars counted with the 10-inch. The cluster stars encompass an area of about 25 arcminutes. Loops of stars with dark lanes throughout, but mostly a random scattering of stars. A fairly bright, mag. 9 star is located just off the cluster edge toward the west.  

Pencil Sketch with inverted colors.

Image by Dr. James Dire of Hawaii using a 10-inch f/4 reflector, and a SBIG ST-2000 XCM CCD camera.  Exposure time 30 minutes.

The following notes and pencil sketch (with inverted colors) of NGC 7789:  By Jaakko Saloranta of Finland

Despite poor observing conditions a rich and very beautiful cluster.

Strong background glow is lost at high magnification.  Several dark pathways visible within the cluster as starless regions.  

Brighter stars concentrated towards the W edge. ~80* within 9′ down to 13th magnitude.  Resembles an open rose.  

Sketch @ 101x (30′) using a 4.5 inch Orion SkyQuest.

This entry was posted on December 14, 2015 at 2:55 am and is filed under Work File Only - Observer's Challenge Reports. You can subscribe via RSS 2.0 feed to this post's comments. Both comments and pings are currently closed.