jul 132013

July 13, 2013

NGC 151, a barred spiral galaxy in Cetus

NGC 153

Image Credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona (http://skycenter.arizona.edu/gallery/Galaxies/NGC151)

NGC 151 (also known as NGC 153) is a barred spiral galaxy of about 125 thousand light-years across, located some 160 million light-years away from Earth in the constellation of Cetus (the Whale). It is receding from us at approximately 3747 kilometers per second.

NGC 151 was discovered on November 28, 1785 by the British astronomer William Herschel. But, the galaxy was discovered again on August 9, 1886 by the American astronomer Lewis A. Swift. In fact, Swift found four nebulae on that night (N163, N217, and N7774 as well as N153). As it happens, all but N7774 had been previously seen. Dreyer caught the identities for two of the nebulae (N163 and N217), but not for N153. So, the galaxy now has two NGC numbers.

This galaxy has a very bright core and its blue spiral arms show many star-forming (HII) regions as well as several reddish dust lanes. Its asymmetric shape indicates that it is gravitational distorted, thus that is interacting with another galaxy. However, no interacting companion is known.

In July 2011 a young Type II supernova, called PTF11iqb, was discovered in NGC 151 with the Palomar Transient Factory (PTF) survey.

This image was taken on October 29th, 2010 with a SBIG STL11000 CCD Camera on the 32-inch Schulman Telescope (RCOS) of the Mount Lemmon SkyCenter. Guest Astronomers: 2010 Chiefland Florida Star Party Workshop Participants

Share this post