Messier 13 (NGC 6205) from my own backyard, observatory and abroad

Messier 13 is a globular cluster in the constellation Hercules.

I imaged this object several times, the latest picture was from my own observatory in 2019 with a dual rig.

Data calibration and registration and the final processing was done with PixInsight. The RGB Data was upscaled to the luminance data. The result was as follows:

The two highest redshift quasars [Flesh 2015] in the image are:
SDSS J164411.85+361404.7 z=3.20 mag_G=20.4 (Gaia DR2)
SDSS J164250.78+360531.7 z=3.16 mag_G=19.3 (Gaia DR2)

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The images were taken with the following equipment:

• Date: 2019
• Telescope: 10″ Newton ohne Namen – TSQ-65ED Apo
• Focal length [mm]: 1000 – 420
• Focal ratio: 3.9 – 6.5
• Mount: Skywatcher EQ 8
• Camera: Moravian G3 16200 FW – Moravian G2 8300 FW
• Filter: L – R:G:B
• Exposure time: 420 – 170:180:130
• Resolution: 1.23″/px – 2.65″/px

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In 2010 I took some images of Messier 13 from my own backyard.

Data calibration and registration was done with DeepSkyStacker and the final processing was done with PixInsight. The result was as follows:

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The images were taken with the following equipment:

• Date: 2010
• Telescope: GSO 8″ Newton
• Focal length [mm]: 800
• Focal ratio: 4
• Mount: Skywatcher NEQ 6
• Camera: Canon 300 Da
• Filter: OSC
• Exposure time: 180
• Resolution: 1.88″/px

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In 2008 I took some images of Messier 13 from my own backyard.

Data calibration and registration was done with DeepSkyStacker and the final processing was done with PixInsight. The result was as follows:

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The images were taken with the following equipment:

• Date: 2008
• Telescope: Pentax 75 SDHF
• Focal length [mm]: 500
• Focal ratio: 6.7
• Mount: Vixen GP-DX
• Camera: Canon 300 Da
• Filter: OSC
• Exposure time: 24
• Resolution: 3.04″/px

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In 2005 I took some images of Messier 13 during a stay at the astrofarm Hakos.

Data calibration and registration was done with DeepSkyStacker and the final processing was done with PixInsight. The result was as follows:

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The images were taken with the following equipment:

• Date: 2005
• Telescope: Rubinar lens
• Focal length [mm]: 500
• Focal ratio: 5.6
• Mount: Liebscher
• Camera: Canon 300 Da
• Filter: OSC
• Exposure time: 16
• Resolution: 2.7″/px

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The first time I imaged Messier 13 was in 2005 from my own backyard.

Data calibration and registration was done with DeepSkyStacker and the final processing was done with PixInsight. The result was as follows:

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The images were taken with the following equipment:

• Date: 2005
• Telescope: GSO 8″ Newton
• Focal length [mm]: 800
• Focal ratio: 4
• Mount: Skywatcher HEQ-5
• Camera: Canon 300 Da
• Filter: OSC
• Exposure time: 5
• Resolution: 1.88″/px

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