M13 - The Great Globular Cluster in Hercules
From the author of Welcome to the Universe in 3D
Links...
Hertzsprung-Russell diagram.RR-Lyrae stars.
Side-by-side comparison with M92.
21:36 EDT June 18, 2023.
ZWO ASI2400MC-Pro on 10" RC at f/9.
Total Exposure time: 60 minutes (unguided 30-second exposures).
22:30 EDT July 03, 2022.
ZWO ASI2400MC-Pro on 10" RC at f/9.
Total Exposure time: 25 minutes (unguided 30-second exposures).
North is to the left.
20:18 EDT Sep 04, 2018.
Starlight Express Trius SX-694 on 10" RC at f/9.
L = 6 min, R = 8 min, G = 6 min, B = 6 min (20 second exposures)
Best seeing ever. Best frame: FWHM = 0.98 arcsec.
Stacked image: FWHM = 1.18 arcsec.
Log stretch.
21:56 EDT Jul 31, 2017.
Starlight Express Trius SX-694 on 10" RC at f/9.
R = 20 min, G = 20 min, B = 20 min
Richardson-Lucy deconv (5 iters), Log stretch.
23:36 EDT Jul 20, 2014.
Starlight Express SXV-H9 on 10" RC at f/9.
L = 66 min (199 twenty-second images),
R = 6 min, G = 6 min, B = 6 min
Richardson-Lucy deconv (2 iters), Log stretch, Unsharp mask.
23:36 EDT Jul 20, 2014.
Starlight Express SXV-H9 on 10" RC at f/9.
L = 10 min (best 30 out of 199 twenty-second images),
R = 6 min, G = 6 min, B = 6 min
Log, Unsharp Mask.
More Contrast
Less Contrast
21:42 EDT Jul 30, 2009.
Starlight Express SXV-H9 on 10" RC at f/9.
L = 25.3 min, R = 6 min, G = 6 min, B = 12 min
Log, Unsharp Mask.
21:42 EDT Jul 30, 2009.
Starlight Express SXV-H9 on 10" RC at f/9.
L = 12 min, R = 6 min, G = 6 min, B = 12 min
(guided 2-minute subexposures).
Log, Unsharp Mask.
Subdued
Bright
01:52 EDT Jun 1, 2005.
Starlight Express SXV-H9 on 10" RC at f/9.
L = 10 min, R = 1.6 min, G = 1.6 min, B = 1.6 min
(mostly unguided 12-second subexposures).
Log Log stretch, Unsharp Mask.
21:30 EDT Aug 9, 2004.
Starlight Express SXV-H9 on 4" Tak FSQ refractor at f/5.
L = 15 min, R = 10 min, G = 10 min, B = 10 min
(unguided 1-minute subexposures).
LogLog, Unsharp Mask.
23:42 EDT Aug 7, 2004.
Starlight Express SXV-H9 on 4" Tak FSQ refractor at f/5.
10 x 1 min unguided exposures.
Artificial Flat, LogLog, Unsharp Mask.
00:30 EDT May 29, 2004.
Starlight Express SXV-H9 on 4" TMB refractor at f/8.
13 x 1 min unguided exposures.
Log, Unsharp Mask, Artificial Flat, Gamma.
Multiresolution composite of 10"RC image with 4" FSQ image.
Click on image for a much larger version (371kB).
Spectral image...
