M13_2009-05-25

Clusters - M13

R.A.: 16h 41m 41s
Dec.: +36° 27' 36.9"
Mag.: 5.8
Dim.: 20 arcmin

Messier 13 (sometimes called the Great Globular Cluster in Hercules) is a globular cluster of about 300,000 stars in the constellation of Hercules. M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.

© Wikipedia

M 13 – Great Hercules Globular Cluster

Date/time:
24.05.2009 11:55 to 25.05.2009 02:00
26.05.2009 00:25 to 26.05.2009 01:45

Ambient conditions: 10°C, transparency 5/5, seeing 4/5,
on first night high clouds.
Location: Trier, Germany

Equipment:
Telescope: TMB 130 SS f/7 with TSFlat 2”
Mount: CGE
Guiding: selfguiding with ST-4000XCM
Camera: SBIG ST-4000XCM
Filters: IDAS LPS

Acquisition:
Software: CCDSoft V5
FOV, Image scale: 57.2 x 57.2 arcmin, 1.68 arcs/pixel
Sub-exposures: 3h 45min (15 x 15min) lights at –15°C,
40 x 15min darks, 55 x 1s flats calibrated with 50 bias @-15°C

Processing:
Entirely processed in Images Plus 3.8 Beta 2: Calibration and Stacking (Median combine) of 12 frames,
DDP (Background weight 0.65), Background/Highlight Smoothing with Max Luminance set on the area of most noise,
Saturation and Brightness level adjustments.

Comments:
A minimum of processing steps were done. No color adjustments done,
since the processing was carried out in a non-calibrated laptop monitor.

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Information

Filename: clusters/m13_2009-05-25_full.jpg
Filesize: 2301580 Kb
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