Fig. 1

image

Left: OSIRIS Wide Angle Camera image taken at UT 01:10 September 21 stretched to show jets above the comet’s neck. The field of view is 12°× 12° which projects to 5.85 × 5.85 km2 at the center of the nucleus. The position of the Alice slit is superimposed on the images. The Sun is towards the top. Right: a 30-min spectral image starting at UT 00:07 September 21. The comet was 3.33 AU from the Sun and the distance to the center of the nucleus was 27.6 km. The solar phase angle was 62.3°. One spatial row of the spectral image projects to 145 m. Atomic H and O features seen in the coma (rows 18–23) are identified. Note the clear separation of O i λ1356 in the coma from C ii λ1335 in the solar spectrum reflected from the nucleus. Credits: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA.

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