  Coronal Mass Ejections (CMEs) are subject to changes in their direction of
propagation, tilt, and other properties. This is because CMEs interact with the
ambient solar wind and other large-scale magnetic field structures. In this
work, we report on the observations of the 2012 October 5 stealth CME using
coronagraphic and heliospheric images. We find clear evidence of a continuous
rotation of the CME, i.e., an increase in the tilt angle, estimated using the
Graduated Cylindrical Shell (GCS) reconstruction at different heliocentric
distances, up to 58 solar radii. We find a further increase in the tilt at L1
estimated from the toroidal and cylindrical flux rope fitting on the in situ
observations of IMF and solar wind parameters. This study highlights the
importance of observations of Heliospheric Imager (HI), onboard the Solar
TErrestrial RElations Observatory (STEREO). In particular, the GCS
reconstruction of CMEs in HI field-of-view promises to bridge the gap between
the near-Sun and in-situ observations at the L1. The changes in the CME tilt
has significant implications for the space weather impact of stealth CMEs.
