Rick,

great detail in addition to the supernova.
I recently had the supernova in NGC 3631 appearing between the nights that
were clear in Berlin. Will post the picture later this week.

Stefan


"WA0CKY" schrieb im Newsbeitrag ...


A supernova was discovered by Koichi Itagaki in NGC 3184 on March 21,
2016. It is officially Supernova 2016bkv. I've wanted to take it ever
since along with 2016bau discovered March 13 as it is in Arp 27. The
first sucker holes didn't open until April 5UT -- and sucker holes they
were! More on that in a bit.

The galaxy NGC 3184 is about 40 million light-years distant so the star
actually exploded 40 million years ago; its light just now reaching us.
In the thumbnail image it is the lower right of two stars to the upper
left of the galaxy's core. See the animated link to see a before and
after image. The star may be one of many in a small blue star cluster
seen in the before image as a blue object. It appears to be on the
upper right edge of this little blue blob of stars. This galaxy hosted
other supernovae in 1999, 1937 and 1921. That's far more often than in
most galaxies, ours included.

Conditions here were awful on the night of April 5UT when this was
taken. As a result I was able to only get two luminance, red and blue
images with one green. The color frames were hit hard by clouds. The
result was bright halos around the brightest stars as well as the entire
image being fainter than I'd like. I'd taken an image of this galaxy in
March of 2014 that was far better. To make this image I used that image
and overlaid the new image after alignment. I cut out the stars with
halos due to the clouds and combined using lighten mode. I was
surprised to see nothing change but for the supernova. That's the full
image with this post. I then cropped both and made an animated GIF to
show the before and after views. This shows the supernova may have been
on the edge of that blue star cluster seen in the original. The
alignment was done by RegiStar so should be dead on.

The original post of this galaxy from 2014 can be seen here
http://www.spacebanter.com/showthread.php?t=205888 .

If the similar try that same night for Arp 27 can be processed I'll try
and have it next. Conditions only had gotten worse by the time I moved
to it however and I've not looked at the data.

I just noticed as I went to post this that a field star to the left edge
of the galaxy is brighter. I assume it is a variable star in our
galaxy.

Link to the animation is
http://www.prairieastronomyclub.org/...tos/SN3184.GIF

Full image is attached

Rick


--
WA0CKY