Planck early results
Free Access



Top left: the path of the spin axis of Planck (in Ecliptic latitude and longitude) over the period 13 August 2009 to 6 June 2010. The evolution of the dwell time (bottom left) and of the solar aspect angle (i.e. the angle between the anti-Sun direction and the spin axis, top right) are shown during the same period. The “day Planck stood still” (day 191) and the period of acceleration/deceleration during observations of the Crab (between days 291 and 310) are clearly visible in both plots. Bottom right: the evolution of the angle between the Moon and the anti-spin axis.

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