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Astrophotography by Bob Franke

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IC 1805, The Heart Nebula in Mapped Color


Click the image for a 4.67 arcsec/pixel display (2700 x 1800)

Click the image for a 4.67 arcsec/pixel display (2700 x 1800)

Click the image for a 4.67 arcsec/pixel display (2700 x 1800)


Takahashi FSQ-106ED @ f/5.0 (530 mm F.L.)  Captured at 3.5 arcsec/pixel.  Shown resampled to 16.8 arcsec/pixel.


Paramount ME


SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

10/5/2008 to 12/6/2008 Chino Valley... with CCDAutoPilot3


SII    360 min. (12 x 30 min. bin 1x1)

Hα    360 min. (12 x 30 min. bin 1x1)
OIII  300 min. (10 x 30 min. bin 1x1)

Hα  is used for the luminance

SII,Ha & OIII are mapped to RGB respectivly

Click here for a BW Hα version

Click here for a natural color version.


CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and Russell Croman's GradientXTerminator

CCDStack to calibrate, register, normalize, data reject & combine.

PhotoShop for non-linear stretching and color combine..


North is to the top.
The colors in the top image follow the spirit of the Hubble Palette.  The lower two images use the same filter mapping but great liberties were taken with the channel levels and hues of individual colors.

Sprawling across hundreds of light-years, emission nebula IC 1805 is a mix of glowing interstellar gas and dark dust clouds. Only about 7,500 light-years away, stars were born in this region, nicknamed the Heart Nebula. Light from this and other glowing gas clouds surrounding hot, young stars comes in very narrow bands of emission characteristic of energized atoms within the clouds. The top image shows the light from sulfur atoms in red hues, with hydrogen in green, and oxygen atoms in blue.

Source:  NASA APOD