COBS News archive

CometWatch – January Part 1
January 21, 2016
Since the start of the 2016 we have been treated to a variety of views of Comet 67P/Churyumov-Gerasimenko from Rosetta’s OSIRIS wide- and narrow-angle cameras through their “Image of the Day” website.

CometWatch 18-19 December
January 11, 2016
Today's CometWatch entry is a double feature, showing two NAVCAM images taken about twelve hours apart, on 18 and 19 December 2015, when Rosetta was around one hundred km from the comet nucleus.

CometWatch 7 December 2015
December 14, 2015
Today's CometWatch entry is a NAVCAM image taken on 7 December 2015, when Rosetta was 103.1 km from the comet nucleus.

Ride along with Rosetta through the eyes of OSIRIS
December 14, 2015
Rosetta’s OSIRIS camera team has launched a new website to showcase their recent images of Comet 67P/Churyumov–Gerasimenko.

Comet fragments best explanation of mysterious dimming star
December 04, 2015
Astronomers have responded to the buzz about a mysterious dimming star by studying data from NASA's Spitzer Space Telescope. They conclude the dimming was probably caused by a family of comets passing in front of the star.

Cometwatch 27 November
December 04, 2015
This week’s Cometwatch entry was taken by Rosetta’s NAVCAM on 27 November 2015 when the spacecraft was 124 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.

CometWatch 17 November 2015
November 20, 2015
Today's CometWatch entry is a NAVCAM image taken on 17 November 2015, when Rosetta was 141.4 km from the nucleus of Comet 67P/Churyumov-Gerasimenko. The spacecraft has not been this close to the nucleus since weeks before perihelion, when the increased amounts of dust due to enhanced comet activity started interfering with navigation and Rosetta remained at larger distances from 67P/C-G.

From one comet landing to another: planning Rosetta’s grand finale
November 17, 2015
As announced in June along with confirmation of the mission’s extension, Rosetta teams are planning to end the operational phase of the mission in a controlled impact of the orbiter on the surface of Comet 67P/Churyumov-Gerasimenko at the end of September 2016. While the specific details of the trajectories and impact site are still under discussion, ESA’s Rosetta Spacecraft Operations Manager Sylvain Lodiot, Project Scientist Matt Taylor, and mission manager Patrick Martin, share some background information on the planning of this dramatic mission finale.

New Comet: C/2015 V2 (JOHNSON)
November 17, 2015
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).

CometWatch 12 November – one year on
November 14, 2015
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.

CometWatch from Gaia
November 05, 2015
On 14 September 2015, Comet 67P/Churyumov Gerasimenko was imaged by Gaia, ESA's billion star surveyor.

First detection of molecular oxygen at a comet
October 31, 2015
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 26 October – 6 hours apart
October 31, 2015
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.

CometWatch 18 October
October 31, 2015
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.

CometWatch 9 October
October 20, 2015
This image of Comet 67P/Churyumov-Gerasimenko was taken by Rosetta’s NAVCAM on 9 October from a distance of 579 km.

Comet jet in 3D
October 13, 2015
OSIRIS scientists have created a spectacular anaglyph view of a jet seen blasting from the nucleus of Comet 67P/Churyumov-Gerasimenko in August.

Interpreting images – more on how the comet got its shape
October 13, 2015
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.

CometWatch 1 October
October 09, 2015
Today's CometWatch entry is an image from Rosetta’s NAVCAM taken on 1 October 2015, at a distance of 1323 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.

Comet Feature Named After Late NASA Scientist Claudia Alexander
October 04, 2015
Scientists from the European Space Agency's Rosetta mission are honoring their deceased colleague, Claudia Alexander of NASA's Jet Propulsion Laboratory in Pasadena, California, by naming a feature after her on the mission's target, comet 67P/Churyumov-Gerasimenko.

CometWatch 30 September – Far, far away
October 04, 2015
Today's CometWatch entry is an image taken by Rosetta’s NAVCAM on 30 September 2015, about 1488 km from the nucleus of Comet 67P/Churyumov-Gerasimenko. The image was taken a few hours after the spacecraft had reached the farthest point – 1500 km from the nucleus – on its far excursion to study the coma and plasma environment of 67P/C-G on a broader scale.