IC 1805 in Ha and OIII light (Bicolor Technique)
click here or on image for a higher resolution
for a horizontal view (Small image &Larger 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.
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.
Filter: Astrodon Ha filter (6 nm bandpass); Astronomiks OIII filter (15 nm
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.
Back to Astronomy Photography