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Monday, December 3, 2012

Melotte 15 in IC 1805, project finalized



After struggling several nights with malfunctioning devices, in freezing -20 centigrade wind, I managed to collect enough data to finalize my Melotte 15 project. (I did lost skin from my finger tips, while fixing various problems out there...)


The heart of the Heart
Melotte 15 (Mel 15) Total exposures 45x1200s = 15h

Be sure to click for a full size image!
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The open cluster centered in this image is known as Melotte 15 . Melotte 15 is embedded within a central portion of the much larger glowing nebula identified as IC 1805. 

The interesting structure in the center of the image is a giant area of hydrogen gas that is caused to glow by the intense ultraviolet radiation from the massive stars of the Melotte 15 star cluster.
Dust and gas clouds are twisted by the pressure of the intense radiation, the solar wind.
This formation is estimated to be 7,500 light years away from Earth, North is up.


An experimental starless image to show the actual nebula better.




A closeup of  Melotte 15 in mapped colors
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In visual colors

Natural color composition from the emission of ionized elements.
R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15% Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
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A two frame panorama of IC 1805 and Mel 15

A two frame panorama of IC 1805 and Melotte 15.
Be sure to click for a full size image!
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Orientation of the mosaic in the IC 1805

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Technical details:

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.

Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 8Hz
Image Scale, ~0,8 arc-seconds/pixel
45 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 15h
Narrowband cahnnels for ionized Oxygen and Sulfur are taken from an older wide field image seen above.



Ps.

Here is the panoramic image in visual colors from the narrowband data.

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
Buy a photographic print from HERE






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