[3] The system was originally discovered in 1893 by Stephane Javelle[5] and is listed in the Atlas of Peculiar Galaxies.

[6] The collision produced an expanding wave of star production (shown as bright blue) traveling at an effective speed of ≳100 km s−1 and began some 40 million years ago.

After the problem was corrected, the telescope's Wide Field Planetary Camera 2 was aimed at Arp 147 and the quality of the images taken assured NASA that Hubble was working properly.

[10]: 6 It also has a star formation rate of approximately 4.68 solar masses per year.

[10]: 9 The smaller companion galaxy (left side) also contains an X-ray source which may be a poorly fed black hole.