Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 0.64 arcsec / pixel.  The Zoomify image scale is 0.85 to 2.55 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

5/9/2010 to 5/13/2010 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.  AOL guided

Exposure

Lum (no filter) 120 min (24 x 5 min, bin 1x1)

RGB               195 min (13 x 5 min each, bin 2x2)

Software

• CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and Russell Croman's GradientXTerminator.

• eXcalibrator for (u-g), (g-r) color calibration, using 13 stars from the SDSS-7 database.

• PixFix32 (pre-beta) to repair hot/cold pixels and column defects.

• CCDStack to calibrate, register, normalize, data reject, combine the sub exposures, luminance deconvolution and LRGB color.

• PhotoShop for LLRGB combine &  on-linear stretching.

North is to the top.
The globular cluster, M92, contains roughly 50,000 to 100,000 stars. These stars formed together and are gravitationally bound. Stars orbit the center of the cluster, and the cluster orbits the center of our Galaxy.

About 160 globular clusters are known to exist in a roughly spherical halo around the galactic center. Globular clusters do not appear spherically distributed as viewed from the Earth, and this fact was a key point in the determining our Sun's location in our Galaxy.

Globular clusters are very old, with M92 being one of the oldest at a computed age of 16 billion years. Its diameter is about 109 light-years and at a distance of 26,700 light years, this diameter is about 14 minutes of arc. M92 is located in the constellation Hercules


Source: NASA APOD & SEDS
 

Instrument

Celestron C11 @  F/6.1 (1705 mm)  1.087 arcsec / pixel

Mount

Losmandy G11

Camera

SBIG ST-7 with CFW-8A color wheel

Acquisition Data

7/9/05 to 7/13/05  Near downtown Seattle

Exposure

Lum     60 min  (12 x 5 min)
Red     40 min  (8 x 5, bin 2 x 2)
Green  40 min  (8 x 5, bin 2 x 2)
Blue    60 min  (8 x 7.5, bin 2 x 2)

Software

CCDSoft, FocusMax, PhotoShop CS, The DitherMat was used to dither the luminance layer.

Comment

North is to the top.