NGC 4145

Click on image for larger version.

NGC 4145 is around 44 million light years away and is part of the Ursa Major cluster of galaxies. This cluster contains many bright spirals for which NGC 4145 is a member. However this galaxy is considered relatively "anemic" due to the fact that unlike most spiral galaxies it does not have alot of star formation taking place. While the spiral arms of this galaxy are punctuated by some activity, the rest of the galaxy is quite quiet. Indeed astronomers suggest that a galaxy like this will soon (in galactic terms) lose the impetus to form stars and settle down to become a lenticular galaxy. Interestingly this galaxy is interacting with another (NGC 4151). This may help maintain the star formation in NGC 4145. In fact close inspection of the nucleus of NGC 4145 seems to indicate that the tug of NGC 4151 has displaced it from its position in the center of NGC 4145.


20in RC Optical Systems telescope Operating at f/8.4
Paramount ME Robotic Telescope Mount
SBIG ST10XME CCD camera with color filter wheel

L R G B color production was used to create this image.

Luminance = 105 minutes binned 1x1
Red = 20 minutes binned 2x2
Green = 20 minutes binned 2x2
Blue = 20 minutes binned 2x2

  • Two iterations of L-R deconvolution (sharpening) algorithm using CCDsharp were applied to the luminance image.

  • Bright guide star contaminated the field with a bit of scattered light.
  • Digital Development (DDP) via Maxim/DL was also used in order to display the the very dim and very bright details of the image simultaneously.

  • Minimum credit line: Adam Block/NOAO/AURA/NSF

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    Updated: 01/21/2005