IC 1805 in Ha and OIII light (Bicolor Technique)

       IC 1805

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Copyright Steve Cannistra

Please click here or on image for a higher resolution view.
Please click here for a horizontal view (small image).
Please click here for a horizontal view (larger image).
Please click here for a description of my bicolor processing technique used for this image.
Please click here for the Ha version of this image.
Please click here for the 3D version of this image.

Magnitude:  6.5 (open star cluster)
Size: about 60'
Distance: 6,150 light years
RA: 2h 32m 41s
Dec: 61 degrees 27' 25"

IC 1805 is a young star cluster surrounded by Ha emitting nebulosity, located in the constellation Cassiopeia.  This region is also known as the "Heart Nebula," since it resembles a heart on a wider field view.   I have chosen to portray this FOV in the vertical orientation, since the detailed dust lanes at the bottom of the image convey a sense of upward motion.  Please click here for more information about this object.

Photographic Details:

Date:  August 26, 2005 (Ha data); August 27, 2005 (OIII data).
Scope:  Takahashi FS102 at f8, on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  Maxcam CM10.

Astrodon Ha filter (6 nm bandpass); Astronomiks OIII filter (15 nm bandpass).
Exposures:  Ha filter, 24 x 10' each unbinned.  OIII filter, 24 x 10' each unbinned.  Total exposure: 8 hours.
Conditions:  Temperature 58-75 degrees F; above average transparency, below average seeing; calm; clear. 
Post-processing:  This is an Ha:(Ha:sG:OIII) composite created with a  new technique that I developed for processing Ha/OIII narrowband images (i.e., without the SII component).  Please follow the link for a full description of the technique.  In the above image, the Ha was used as luminance, and the color was provided by the Ha:sG:OIII composite.

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