CBET nr. 4161, issued on 2015, November 05, announces the discovery of a comet (magnitude ~17.1) by J. A. Johnson on CCD images obtained with the Catalina Sky Survey's 0.68-m Schmidt telescope on Nov. 3.5 UT. The new comet has been designated C/2015 V2 (JOHNSON).
Today’s CometWatch entry was taken yesterday by Rosetta’s NAVCAM, on the anniversary of Philae’s historic landing on Comet 67P/Churyumov-Gerasimenko last year. The image was taken from a distance of 177.7 km; the image scale is 15.1 m/pixel and the image measures 15.5 km across. It has been lightly enhanced to better show the comet’s activity.
On 14 September 2015, Comet 67P/Churyumov Gerasimenko was imaged by Gaia, ESA's billion star surveyor.
ESA’s Rosetta spacecraft has made the first in situ detection of oxygen molecules outgassing from a comet, a surprising observation that suggests they were incorporated into the comet during its formation. This news story is mirrored from the main ESA web portal.
CometWatch this week comprises two NAVCAM images acquired six hours apart on 26 October 2015. The images have been lightly enhanced to reveal some detail of the comet’s activity (the unprocessed images are available at the end of the post). In the six hours that passed Rosetta also moved 2.3 kilometres closer to the comet, resulting in slightly different image scales between the two images.
Today's CometWatch entry was taken by Rosetta’s NAVCAM on 18 October 2015, at 433 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.
This image of Comet 67P/Churyumov-Gerasimenko was taken by Rosetta’s NAVCAM on 9 October from a distance of 579 km.
OSIRIS scientists have created a spectacular anaglyph view of a jet seen blasting from the nucleus of Comet 67P/Churyumov-Gerasimenko in August.
On 28 September, a scientific paper was published in Nature, presenting a view on the formation scenario of Comet 67P/Churyumov-Gerasimenko, based on Rosetta OSIRIS images (read our news report here). The paper, led by Dr Matteo Massironi of the University of Padova, Italy, evaluated two possible models to explain the comet's curious shape: the merging of two cometesimals or the erosion of a single object. Observational data and thorough analysis of the comet's gravity field pointed towards the first of the two hypotheses: 67P/C-G seems to have originated from two separately formed comets that merged at low speed.