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Wednesday, August 24, 2011

NGC 1499, the "California Nebula" reprocessed, ones again...




I did reprocessed this nebula since my skills are much better now, than two years ago.
All the exposures I have taken for this object are used. Total exposure time is over 20h together for all three channels, Ionized Sulfur, Hydrogen and Oxygen. Two camera lenses was used to capture the data, a Tokina AT 300mm f2.8 and a Canon EF 200mm f1.8, both lenses was used at full aperture.


NGC 1499, in Perseus

Ra 04h 03m 18s Dec +36° 25′ 18″

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.

This object has a very large angular scale, as can be seen in a last image in this page.
It has a lowish surface brightness too, hence 20h of exposures, with fast optics, was needed.
California nebula located in constellation Perseus at distance of ~1000 light years.

HST-palette, (HST=Hubble Space Telescope) from the emission of ionized elements, 
R=Sulfur, G=Hydrogen and B=Oxygen.



Apparent scale in a sky

This is a large object, note,  the size of the Moon is marked, as a scale, in all of the images above.

The Wikipedia article states, that the angular size is about 2,5 degrees (Five full Moons side by side)
but as can be seen in this image, the actual size, with a dim outer parts, is much large.

Experimental 3D-studies of NGC1499 can be found in my portfolio, in different formats.
Please, have a look here:
http://astroanarchy.zenfolio.com/f359296072


Previous reprocessed version can be seen here:

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