Images of the bow shock associated with HD 53974 from the AAO/UKST SuperCOSMOS Hα survey (Hambly et al. 2001) overlaid with linearly scaled contours of the emission at 22.2 μm that outline the shape of the bow shock. Left: the blue vector represents the direction defined by the HIPPARCOS proper motion corrected for galactic rotation and basic solar motion, within 1σ errors. Right: a WISE color-composite image of the bow shock is inset at the top left corner of the figure. The blue vector indicates the preferential orientation (apex) of the bow shock, which we define by drawing a straight line from the location of the star to the point of highest 22 μm emission. The 1σ uncertainty (thin blue lines) is outlined by the highest level contour from the 22.2 μm emission. The vector lengths are not to scale (north is up, east to the left).