K3's Astronomy - Deep Sky
"When I consider your heavens, the work of your fingers, the moon and the stars which You have set in place, what is Man that You are mindful of him?" -- Psalm 8:3,4

M13 - The Great Globular Cluster

Photo: 27.07.2003, 8" F6 Newtonian, 69x15s

The brightest globular cluster on northern sky. It contains almost 1 million stars. The diameter of the cluster is around 150ly, distance 22800ly.


A, Detailed Photos
B, Wide Angle Photos

A, Detailed Photos


Click the picture to see full resolution photo (1.27"/pixel).
M13 - The Great Globular Cluster 27.07.2003 (26.07.2003, 22:27 - 22:48 UT)
Resolution: 1.905 arcsec/pixel
Camera: Vesta 680 SC3.2
Telescope: 8" F6 Orion Europa Newtonian
Result focal ratio: F6
Exposure: 69x15s (gain 100%, Amp OFF), 16xDF, no cooling
Captured and processed by K3CCDTools, then in Corel PhotoPaint
Seeing: hazy, lim.magnitude for naked eye 3.5, temperature 20C

Processing:
1, summed in X2 mode in K3CCDTools
2, histogram + gamma 1.6, resampled to 100% and 67% size
3, adaptive unsharp mask in PhotoPaint (50%)


Click the picture to see full resolution photo (1.27"/pixel).
M13 - The Great Globular Cluster 27.07.2003 (26.07.2003, 22:48 - 23:01 UT)
Resolution: 1.905 arcsec/pixel
Camera: Vesta 680 SC3.2
Telescope: 8" F6 Orion Europa Newtonian
Result focal ratio: F6
Exposure: 69x15s + 71x8s (gain 100%, Amp OFF), 16xDF
Captured and processed by K3CCDTools, then in Corel PhotoPaint.
Seeing: hazy, lim.magnitude for naked eye 3.5, temperature 20C

Processing:
1, separately 2 AVI sequences (15s, 8s exposures) summed in X2 mode in K3CCDTools
2, histogram + gamma 1.6
3, results 15s + 8s stacked stacked together
4, resampled to 100% and 67% size
5, adaptive unsharp mask in PhotoPaint (50%)

Click the picture to see full resolution photo (0.96"/pixel).
M13 - The Great Globular Cluster 24.08.2002 (21:48 - 22:08 UT)
Resolution: 1.92 arcsec/pixel
Camera: Vesta 675 SC2
Telescope: 8" F6 Orion Europa Newtonian
Result focal ratio: F6
Exposure: 39x10s (gain 100%, Amp ON), 15xDF
Captured and processed by K3CCDTools, then in Maxim DL Demo and Corel PhotoPaint.
Seeing: hazy, almost full Moon, lim.magnitude for naked eye 3.5, temperature 17C

Processing:
1, stacked in X2 mode in K3CCDTools
2, gamma 2.0 in MDL, resampled to 100% size
3, adaptive unsharp mask in PhotoPaint (75%)
4, gamma 1.10, unsharp mask 1,1,100%

Click the picture to see full resolution photo (0.96"/pixel).
The same AVI source as above, but Registax software used.

Resolution: 1.92 arcsec/pixel
Camera: Vesta 675 SC2
Telescope: 8" F6 Orion Europa Newtonian
Result focal ratio: F6
Exposure: 36x10s (gain 100%, Amp ON), 15xDF
Captured by K3CCDTools, stacked and preprocesed by Registax, then in Maxim DL Demo and Corel PhotoPaint.


Click the picture to see full resolution photo (0.96"/pixel).

M13 - The Great Globular Cluster 11.10.2001 (18:49 UT)
Resolution: 1.92 arcsec/pixel
Camera: Vesta 675SC at prime focus
Telescope: 8" Orion Europa Newtonian
Exposure: 12x7s (gain 95%), 20xDF
Seeing: lim.magnitude for naked eye 4.5

This is my second deepsky object.

B, Wide Angle Photos


Click the picture to see full resolution photo (1014x736 pixels, 4.74"/pixel).
M13 (The Great Globular Cluster) 30.09.2002 (21:01 - 21:27 UT)
Resolution: 14.2 arcsec/pixel
Camera: Nikon Coolpix 995, f=18.8mm
Telescope: 80mm F5 Refractor, 25mm eyepiece afocal
Result focal length: 300.8mm (~37X Zoom)
Result focal ratio: F3.76
Exposure: 12x60s (ISO200, incadescent -3), Noise Reduction
Camera control: The Force software
Processed by K3CCDTools, then in Corel PhotoPaint.
Seeing: nice clear skies (in light poluted city), but windy,
lim.magnitude for naked eye 4.5, temperature 11C

This is my first astro photo with Nikon digital camera and afocal projection.The field of view is almost 1.5. Unfortunatelly M13 was only 21 above horizon.
The image is without flat field correction.
Processing details:
1, aligned and summed in K3CCDTools
2, histogram stretch 0-60%, gamma 1.3 in K3CCDTools
3, resized to 50% in Corel PhotoPaint, 75% adaptive unsharp mask

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Last Update: 27.07.2003