|
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, 2004et’s 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. |
════════════════════════════════════════
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 wasn’t 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. |
|