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NGC 2403 is a spiral galaxy in the constellation Canes Venatici. NGC 4395 has an active galactic nucleus (AGN), which gives off large amounts of energy largely in the form of high-energy x-rays and gamma rays, and is classified as a Seyfert galaxy. Seyfert galaxies are galaxies with extremely bright nuclei that produce spectral line emission from highly ionized gas. The centers of Seyfert galaxies have active galactic nuclei, and usually contain supermassive black holes with masses between 10 and 100 million solar masses. However, NGC 4395 is notable for containing one of the smallest supermassive black holes ever discovered, with an accurately-determined mass. The central black hole has a mass of “only” 300,000 solar masses, which would make it a so-called “intermediate-mass black hole”.
Distance: 14 million light years
Size: 55,000 light years across
Camera: SBIG ST-10XME
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: An RGB image with 86 subexposures of 10 minutes each with 27 of red, 27 of green, & 32 of blue for a total time of 15 hours & 30 minutes.
Date: March 2013
Software: Camera, mount, and guider control - CCD Commander & MaximDL; calibration, stacking, & color creation in CCDStack, and further processing in Photoshop CS6.