Comet Garradd Passes Ten Thousand Stars . ... Credit Copyright: Richard Tresch Fienberg ( AAS ) Explanation: Comet Garradd continues to brighten as it drifts across the northern sky. Last week the comet, visible with binoculars and discernable by its green coma , passed nearly in front of globular cluster M71. ... The photogenic duo was captured with a standard digital camera in a 10-minute, wide-angle exposure toward the northern constellation of the Arrow (Sagitta). ...