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Saturday, March 14, 2020

From Bubble to Cave, round II

I have published a horizontal version of this image few days ago, it can be seen here,
This vertical version works too, it's little longer, than horizontal one. This area is part of much larger mosaic image of Cepheus, it can be seen here,

From Bubble to Cave Nebula
Click for a large image, 

Image is in mapped colors from a light from the ionized elements, hydrogen = green, sulfur = red and oxygen = blue.

Sharpless 157, a Zoom Out Series
Click for a large image, NOTE, 4500 x 1024 pixels!

I made a Zoom out serie about Sharpless 157. It's a complex region near the famous Bubble nebula and it's kind of large. There are not too many photos of it around. I have marked the apparent size of the full Moon in each image. The angular size of a Moon is about 0,5 degrees, that's 30 arc minutes.
This kind of image gives an idea, how complex and fractal the gas structures can be. there are endless amount of variations and new details at every zoom level and beyond. 

Technical details

The vertical image is taken with Tokina AT-x camera optics, Apogee Alta U16 astrocamera and Astrodon narrowband filter set. Info about my imaging system can be seen here,
Some older parts of the photo are taken back in 2014 with QHY9 astrocam, Baader narrowband filters and Canon EF 200mm f1.8 camera lens.

Photo is taken from downtown Oulu, Finland. Due to an extensive light pollution I can do only narrowband imaging in my location. 
Total exposure time is around 20 hours.

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