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The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) missionobserved comet C/2013 A1 (Siding Spring) three times at 3.4 {\mu}m and 4.6{\mu}m as the comet approached Mars in 2014. The comet is an extremelyinteresting target since its close approach to Mars in late 2014 will beobserved by various spacecraft in-situ. The observations were taken in 2014Jan., Jul. and Sep. when the comet was at heliocentric distances of 3.82 AU,1.88 AU, and 1.48 AU. The level of activity increased significantly between theJan. and Jul. visits but then decreased by the time of the observations inSep., approximately 4 weeks prior to its close approach to Mars. In this workwe calculate Af\r{ho} values, and CO/CO2 production rates.

NEOWISE observations of comet C/2013 A1 (Siding Spring) as it approaches Mars