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California Nebula: This is a huge hydrogen cloud in the constellation of Perseus visible only as a brighter shade in very clear and dark nights. It seems to resemble the state of California. Some very bright stars, predominantly the one close to the center part of the image make the dense dust and hydrogen clouds shine in the emission lines of several elements.

The image was composed from frames taken with four different narrow band filters letting pass only the H-alpha line of hydrogen, the [OIII] line of oxygen, the [SII] line uf sulfur and the H-beta line of hydrogen.


Object California Nebula
Category Emission Line Images
Designation NGC 1499
Constellation Perseus
Optics Canon EF Telelens 200mm 1:2.8 @ f/3.5
Mount Takahashi EM-11
Camera SBIG STL 11000M with internal CFW 5
Exposure 8 x 20min H-alpha, 6 x 20min H-alpha(2x2 bin), 3 x 10min [OIII](2x2 bin), 3 x 10min [SII] (2x2bin), 3 x 10min H-beta (2x2 bin) Baader filterset. Maxim DL for image acquisition
Calibration Dark + Flat Frame
Guiding Meade DSI Pro II and Skywatcher ED80 as Guidescope, Guiding Software: Maxim DL
Processing Maxim DL5,Photoshop. Color Code R:[H-alpha+SII], G:[OIII], B:[H-beta]
Location-Date Eningen, Germany - 20+21+22 Oct 2010
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