David's Astronomy Pages (Sky Tours)
Jun (2) - Summer Star Clusters

Image collection based on the sky tour "Opening up the summer skies" featured in the June 2012 edition of Astronomy Now. Comprising star clusters in Cygnus, Sagiitta, Serpens, Scutum and Sagittarius.

Bullet  1. M8 - Star Cluster/Nebula (Lagoon Nebula, NGC 6530)
Bullet  2. M23 - Open Cluster (NGC 6494)
Bullet  3. M26 - Open Cluster
Bullet  4. M11 - Open Cluster ("Wild Duck Cluster")
Bullet  5. IC 4756 - Open Cluster ('Graffs Cluster')
Bullet  6. Harvard 20 / Collinder 408 - Open Cluster (not yet imaged)
Bullet  7. NGC 6791 - Open Cluster
Bullet  8. M39 - Open Cluster
 

1.  M8 - Star Cluster/Nebula (Lagoon Nebula,  NGC 6530)

M8 (Sagittarus)
Image
CCD Image (45% size reduction, cropped)
10 x 15s sec exposure (average combine), 2x2 binning, C Filter
2009-06-25 23:31 h UT (#373033-42)
12" LX200R  (at f/5.7) + ST-10XME
[ Larger view 70% size

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2.   M23 - Open Cluster (NGC 6494)

M23 (Sagittarus)
Image
CCD Image Mosaic (30% size reduction
20s sec exposure, 2x2 binning, C Filter
2009-05-27 00:02 h UT (#369134-50)
12" LX200R  (at f/5.7) + ST-10XME
Image at 10 deg above SSE horizon
 
M23 - detail central area
Image
CCD Image (60% size reduction)
4 x 30s sec exposure (average combine), 3x3 binning, C Filter
2009-05-26 23:53 h UT (#369128-32)
12" LX200R  (at f/5.7) + ST-10XME
Image at 10 deg above SSE horizon

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3.  M26 - Open Cluster

M26  (Scutum)
Image Image
CCD image,  5 x 20 sec exposures 
(top - median combine
bottom - summed combine)
2003-08-05  21:57 to 21:59 h UT (#49049-49053)
Image : 11.4 x 7.6 arc mins 
8" LX200 classic + ST-7e

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4.   M11 - Open Cluster ("Wild Duck Cluster")

M11 (Scutum)
Image
 CCD Image Mosaic, 3x4, (50% size)
30 sec exposure, 2x2 binning, C Filter
Cropped
2007-05-20 01:15h UT (#200083-94)
[larger image, 70% size]

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5.  IC 4756 - Open Cluster ('Graffs Cluster')

IC 4756 (Sagittarius)
(image shows just part of this 40' x 40' cluster)
Image
CCD Image (50% size)
5 x 30s exposure (average combine), 3x3 binning, C Filter
2017-11-02 19:55h UT (#603113-16)
12" LX200R  (at f/10.4) + ST-10XME
[ 75% size ]

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6.   Harvard 20 / Collinder 408 - Open Cluster

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7.   NGC 6791 - Open Cluster

NGC 6791 (Lyra)
Image
CCD Image (Linear Scale, 75% size)
3 x 30s exposure (average combine), 3x3 binning, C Filter 
2010-08-26 21:51hUT (#426057-60)
12" LX200R  (at f/9.7) + ST-10XME

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8.  M39 - Open Cluster

M39 (Cygnus)  
Image
Central portion of a CCD Image Mosaic (5x3,  15 Frames)
20 sec exposure,  R Filter
2005-10-09 03:16 h UT  (#99084-98 {S98} )
8" LX200 classic + ST-7e
(Full Size)

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