IC1805 Heart Nebula

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2012/09/09 - I finally ordered my new setup: the ASA DDM60PRO with a Robtics 10" Ritchey Chretien and Moonlite high resolution stepper focuser. I have to wait for the mount to arrive, but I did pick up the OTA. So this is my first light with the 10" RC. I didn't collimate it and the EQ6 mount was having a hard time (17 kg and 2000mm focal length), but I managed to get a good image.

The Heart Nebula, IC 1805, Sh2-190, lies some 7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. This is an emission nebula showing glowing gas and darker dust lanes. The nebula is formed by plasma of ionized hydrogen and free electrons. The very brightest part of this nebula (the knot at the right) is separately classified as NGC 896, because it was the first part of this nebula to be discovered. The nebula's intense red output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun's mass. The cluster used to contain a microquasar that was expelled millions of years ago.

Object information
Name : IC1805 Heart Nebula
Type : Nebula
Constellation : Cassiopeia
Distance : 7.500 light-year
Apparent dimensions : 60' x 60'
Apparent magnitude : 18.30

Image information
Image date : 2012/09/09
Right ascension : 2:33:36.189
Declination : 61°27' 50.09"
Focal length : 1985.93 mm
Focal ratio : f/7.82
Image resolution : 0.561 arcsec/pixel
Field of view : 30' 34.0" x 22' 54.1"
Sensor temperature : 0°C
Light frames : 5 hours total exposure time
10x 1800 sec. hydrogen-alpha unbinned
Image acquisition with Maxim DL
Auto-guiding with Maxim DL
Bias frames : 100x unbinned
Dark frames : Bap pixel map
Flat frames : none
Processing : PixInsight for calibration (bias frames, bad pixel map and flat frames), alignment and integration.
Adobe Photoshop CS6 for final touch.

Equipment information
Telescope : Robtics 10" 2000mm f/8 Ritchey Chretien
Corrector : None
Focuser : Moonlite CS Ritchey Chretien focuser with high resolution stepper motor
Mount : Sky-Watcher NEQ6-Pro german equatorial mount controlled with EQMOD via HiTec Astro EQDir
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