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NGC 2403, Spiral Galaxy

NGC 2403 is a spiral galaxy which has approximately half the mass of Milky Way. Spiral galaxy is shaped like a flat disk with bulge at the center which contains old stars and pinwhell-like arms of interstellar material and young stars winding out from its nucleus.At the very center of spiral galaxy, there is a supermassive black hole. There are many spiral galaxies in the Universe, and our own Milky way is also a spiral galaxy.

Above is a picture of NGC 2403. We can see very bright nucleus with spiral arms rotating its center. But,the spiral of NGC 2403 is not as well defined as those of grand design spirals.The big and bright stars in the picture are from our galaxy, the Milky Way, with NGC 2403 in the backgound.The distance to this object is estimated to be 10 million light years; we find a maximum angular size of around 396 arcseconds, which corresponds to a linear size of approximately 20,000 light years.


Fraknoi, Andrew, David Morrison, and Sidney Wolff. Voyages To The Planets. 3rd ed. N.p.: Thomson Brooks/Cole, n.d. 382. Print.

Fraser, Cain. "Spiral Galaxy." Universe Today. N.p., 1 May 2009. Web. 12 Apr. 2011. <>.

Right Ascension (J2000) 07:36:54.50
Declination (J2000) 65:35:58.0
Filters used Clear
Exposure time per filter 300s x 4
Date observed March 24, 2011 UT



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