IC 1805 and surrounding nebulosity (Heart Nebula)

IC 1805
All Images Copyright Steve Cannistra

Please click here or on image for a higher resolution view.
Please click here for the hydrogen alpha image used as luminosity.

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.  The young age of this open cluster is very apparent during image processing, when the prominent blue color of the central stars was obvious.  This region is also known as the "Heart Nebula," since it resembles a heart on a wider field view.  There is a great deal of interesting detail within this image that can be best appreciated on the higher resolution view.  Please click here for more information about this object.

Photographic Details:

Date:  August 25, 2004
Takahashi Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  SXV-H9
Astronomik Ha filter (13 nm bandpass); Type II R, G, B filter set.
Exposures:  Ha:(HaR:G:B).  24 x 5' for Ha (120 minutes total, unbinned); 6 x 4' each for R, G, and B (24 minutes total for each color), all unbinned.
Conditions:  Temperature 52 degrees F (started at 70 degrees); above average transparency; above average seeing; calm; moonlight during Ha imaging.
No darks, flats, or bias frames used.  Alignment done in ImagesPlus.  Sigma combined using RC Sigma Reject Plug-in for MaximDL.  DDP was performed in ImagesPlus (IP).  Subsequent levels and curves adjustments in Photoshop CS (16 bit format).  Ha was combined with RGB using the technique of Luminance Corrected RGB.

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