IC410 and open cluster NGC1893

All Images Copyright Steve Cannistra

Please click here or on image for a higher resolution view (1386 x 1019).

Magnitude:  7.5 (for the open cluster).
Size: about 11' (for
the open cluster).  However, the FOV shown here is approximately 1 degree, which demonstrates the extent of nebulosity associated with IC410.
Distance: ?
RA: 5h 22m 44s
Dec: +33 degrees 24' 43"

IC 410 is a region of faint Ha nebulosity surrounding the open star cluster NGC 1893.  The cluster itself is small and located just below center, underneath the central dust region of the nebula.  This nebula contains complex wisps of gas and is a beautiful target for Ha astrophotography, although it is surprisingly difficult to find detailed information about this region on-line.  The two prominent filamentous columns located just below and left of center may have been blown outward as a result of radiation emitted from the open cluster (notice how their "tails" generally point away from NGC 1893).  The lower column has a curved, globular head which might represent a bow shock as gases pushed by radiation accumulate in this region, and/or might indicate
an area of star formation.

Photographic Details:

Date:  November 12
, 2005.
Scope:  Takahashi FS-102 at f6 with TOA-130 focal reducer, on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  Maxcam CM10.

Astronomiks 6nm Ha filter.
Exposures:  L: 18 x 10' unbinned, total luminance exposure 3 hours.
Conditions:  Temperature 32 degrees F, average transparency, poor seeing, calm, clear.   I had hoped to obtain OIII data as well, but had difficulty with a stuck shutter during unattended imaging that ruined most of the OIII exposures.
Post-processing:  Subs were calibrated and aligned in Maxim.  Combined using RC Sigma Reject Plug-in for MaximDL, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS (16 bit format).

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