C 2001 A2 (LINEAR): Comet . ... This picture of the comet is a combination of 33 individual one minute exposures made on June 30 with a small telescope and digital camera situated in central Arizona, USA. ... Closely spaced, the combined exposures were registered on the comet so background stars appear trailed. To produce the "punctuation" at the end of each star trail , two exposures near the end of the sequence were left out. ... NASA Web Site Statements, Warnings, and Disclaimers . ...