NGC 3509 known as Arp 335, is a barred spiral galaxy[1] located in the constellation Leo.

[7] It has a sweeping tidal tail feature, which seems to offer hints of evolution[8] and makes the galaxy resemble a tadpole.

[9] According to a sketch drew by Toomre, a large tail of NGC 3509 is seen curved towards northwest while the shorter one extends southwest.

Later investigations proved him wrong as it is actually a bright ridge of the galaxy's disk structure.

SN 2010bi[17] was discovered on March 24, 2010, by G. Piginata and M. Cifuentes along with other astronomers from University of North Carolina at Chapel Hill on the behalf of the CHASE project (CHilean Automatic Supernova sEarch).