May. 30th, 2015

Messier 82

May. 30th, 2015 06:07 pm
fivemack: (iguana)
This is a starburst galaxy in Ursa Major; it's a spiral galaxy, viewed edge-on, with an enormous cloud of dust in front of it.

Sum of two 90-second exposures at ISO 1600 with 2250mm-focal-length f/4.5 giant telescope; I took five, but for three of them the wind was blowing hard enough to disrupt the telescope guiding and distort the bright stars into unusably strange shapes.

The apparently odd-shaped star in the top left is HD85161, which does have a companion star in the position that appears on this picture. It's surprisingly hard to find on-line star catalogues comprehensive enough to tell me how bright the faintest stars appearing in this picture are; ones which are over-exposed to the point of saturating at the centre are around magnitude eleven (IE a hundred times too faint to be seen with the naked eye), which makes sense since the big telescope collects about ten thousand times as much light as the naked eye does.

M82-web
fivemack: (iguana)
This is another spiral galaxy, just short of edge-on to us, with a very prettily-placed band of dust in the plane of the galaxy - you can see that the nucleus is on the top side.

Tends to be called the Sombrero galaxy. Combination (using software I've just written) of five 90-second exposures; the purple colour cast is an artefact of pulling the levels up to show the faintest stars.

M104-web

July 2017

S M T W T F S
      1
2345678
9101112131415
161718 19202122
23242526272829
3031     

Most Popular Tags

Page Summary

Style Credit

Expand Cut Tags

No cut tags
Page generated Sep. 21st, 2017 03:16 am
Powered by Dreamwidth Studios