M53 Globular Cluster

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2013/05/05 - Conditions weren't optimal, some high Cirrus clouds and seeing was at best 2.35".

Messier 53 (also known as M53 or NGC 5024) is a globular cluster in the Coma Berenices constellation. It was discovered by Johann Elert Bode in 1775. M53 is one of the more outlying globular clusters, being about 60,000 light-years away from the Galactic Center, and almost the same distance (about 58,000 light-years) from the Solar system.

Object information
Name : M53 Globular Cluster
Type : Globular cluster
Constellation : Coma Berenices
Distance : 58K light-year
Apparent dimensions : 13'
Apparent magnitude : 8.33

Image information
Image date : 2013/05/05
Right ascension : 13:12:55.322
Declination : 18°10' 3.39"
Focal length : 1381.44 mm
Focal ratio : f/5.44
Image resolution : 0.806 arcsec/pixel
Field of view : 44' 22.3" x 33' 13.1"
Sensor temperature : -30°C
Light frames : 3 hours, 35 minutes total exposure time
16x 300 sec. luminance unbinned
9x 300 sec. RGB unbinned
Image acquisition with CCDAutoPilot and Maxim DL
Auto-guiding with Maxim DL
Auto-focusing with FocusMax
Bias frames : 100x unbinned
Dark frames : None
Flat frames : 12x luminance unbinned
12x RGB unbinned
Twilight flats; 6x at dawn and 6x at dusk.
Processing : PixInsight for calibration, alignment and integration.
Adobe Photoshop CS6 for final touch.

Equipment information
Telescope : Robtics 10" 2000mm f/8 Ritchey Chretien
Corrector : Astro-Physics CCDT67 Focal Reducer
Focuser : Moonlite CS Ritchey Chretien focuser with high resolution stepper motor
Mount : ASA DDM60 Pro direct drive german equatorial mount controlled with AutoSlew
Camera : QSI 683wsg-8 cooled CCD camera with Kodak KAF-8300 sensor and Off Axis Guide (OAG) port
Guidecamera : Starlight Xpress Lodestar autoguider
Filters : Astrodon Tru-Balance E-Series LRGB & Astrodon 3nm H-α, 3nm O-III, 3nm S-II and 3nm N-II
Observatory site : Etten-Leur, The Netherlands