NGC 3506 is aspiral galaxy in the constellationLeo. It is located at a distance of circa 300 millionlight years from Earth, which, given its apparent dimensions, means that NGC 3506 is about 115,000 light years across. The galaxy has two main spiral arms, with high surface brightness, which can be traced for half a revolution before they fade. One arm splits into four spiral arcs.[2]
SN 2003L (Type Ic, mag. 16.9) was discovered byTom Boles and LOTOSS (Lick Observatory andTenagra Observatory Supernova Searches) on 12 January 2003.[4][5] Its spectrum featured a relatively blue continuum, dominated by strong P-Cyg lines of Ca II (H and K) and Fe II and a relatively weaker Si II 635.5-nm line was also visible.[6]
SN 2017dfq (Type Ia, mag. 16.5) was discovered byASAS-SN on 20 April 2017.[7]
SN 2021adgz (Type II, mag. 19.408) was discovered byAutomatic Learning for the Rapid Classification of Events (ALeRCE) on 4 November 2021.[8]
Media related toNGC 3506 at Wikimedia Commons
