Bubble nebula and open cluster M52 (Cassiopeia constellation)

La nébuleuse de la Bulle et l'amas ouvert M52 dans la constellation de Cassiopée (NGC 7635)

>>>>> The labeled and annoted image of the Bubble nebula

DESCRIPTION

The Bubble nebula (NGC 7635) is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star, the 15 ± 5 MSAO 20575 (BD+60 2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by Friedrich Wilhelm Herschel. The star SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.

Credit : APOD and Wikipedia informations

ACQUISITION

 

Date & Location

2, 3, 5 Aout 2011 – Lozère, France

Telescope/Optics

Takahashi FSQ 106ED

Mount

Takahashi EM200

Camera CCD

SBIG STL 4020M

Focuser

Robofocus/FocuxMax

Filters

Ha/SII/OIII Astrodon filters

Guidage

Off-axis MMOAG (Astrodon) STL remote guider TC-237H

IMAGING PROCESS

 

Exposures

Ha(21*15min) SII(18*15min) OIII(18*15min)

Total : 14h30

Out temperature : 13°C

In CCD temperature : -25°

Softwares for acquisition

Robofocus, Focusmax,  MaximDL, TheShy6 Pro, CCDAP 4

Softwares for digital image processing


Calibration, Registration, Color stack with CCDstack 1.0 (CCDIS plug-in)

Full processing with PIXINSIGHT Core version 1.7


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