Focal Pointe Observatory
Astrophotography by Bob Franke

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NGC 6946   

 
 

Instrument

Celestron C11 @ F/6.1 (1708 mm)  1.085 arcsec / pixel

Mount

Losmandy G11

Camera

SBIG ST-7 with CFW-8A color wheel

Acquisition Data

5/1/06 to 5/14/06  Near downtown Seattle

Exposure

Lum    375 min  (75 X 5 min)
Red    120 min  (24 x 5, bin 2 x 2)
Green 120 min  (24 x 5, bin 2 x 2)
Blue   120 min  (16 x 5, bin 2  x 2)

Software

CCDSoft, FocusMax, CCDOPS, Sigma Clip (pre beta 11, PhotoShop CS with Noel Carboni's actions and PaintShop Pro.  DitherMatic was used to dither the luminance layer.

Comment

Well, here it is two years later and supernova 2004et has completely faded away.  At discovery, 2004etís magnitude was 12.8.  By 1/31/2006 it had faded to 19.0 and now it cannot be seen in this image.

NGC 6946 is located just 10 million light-years away, behind a veil of foreground stars in the constellation of Cepheus. During the 20th century, at least six supernovae, the death explosions of massive stars, were discovered in NGC 6946.

North is to the bottom.

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Instrument

Celestron C11 @  F/7.2 (2000 mm fl) 0.93 arcsec / pixel

Mount

Losmandy G11

Camera

SBIG ST-7 with CFW-8A color wheel

Acquisition Date

9/25/04 to 10/27/04  Near downtown Seattle

Exposure

Lum     690 min. (46 x 15 min)  
Red     105 min (14 x 7.5)
Green  105 min (14 x 7.5)
Blue     345 min (23 x 15)

Software

CCDSoft, CCDOPS, Sigma Clip (pre beta 11), PhotoShop CS and Paint Shop Pro.

Comment

In the upper right corner is supernova 2004et, discovered 2004/09/27.845 by Stefano Moretti.  My first image of the nova was on 2004/09/25, too bad I wasnít looking for it.  As far as I know there is only one earlier image of 2004et, also taken on 2004/09/25.

North is to the bottom.