Figure 4: Plane of sky on 2014 October 7 as seen from the Mars Reconnaissance Orbiter. The origin is set on the prediction corresponding to solution 97. Ellipses correspond to the 3 σ uncertainty level. Dashed curves represent the plane-of-sky motion: C/2013 A1 is moving North-East. −10 −5 0 5 10 15 −10 −5 0 5 10 15 20 Δ  RA cos(DEC) [arcsec] Δ  DEC [arcsec] Solution 95 Solution 97 HiRISE observations 17