The rotation period seems to have a range of 5 to 9 hours, it is probably 6.1 hours if we use the ESO NTT images and some previous observations at Pic du Midi. We suggest also that the nucleus shows actually its southern hemisphere to Earth-based observers and that Sun lies near its equatorial plane. The exposure time was 20 minutes. Then the dust continuum is removed. The jet position agrees with the rotational period derived from february 19th observations.
North is up and west is on the right.
The comet was at 0.515 UA from the Earth. The two images are the result of an addition of 9 images. The exposure time of each individual image is 240 seconds. We used a filter centered at 720 nm with a fwhm of 350 nm. The left image is the result of the addition of the single frames centered on the comet nucleus.