Comets

Blogs about comets

Great telescopes to study Comet 46P/Wirtanen

Various telescopes such as the Hubble Space Telescope, the SOFIA flying telescope and the ALMA radio telescope were used to examine the innermost region of Comet 46P/Wirtanen, nicknamed the Christmas comet because in recent days it made an Earth flyby. This expression has to be considered in a broad sense since it reached 11.6 million kilometers (more than 7 million miles) on December 16. This was enough to obtain interesting information such as the detection of hydrogen cyanide molecules in its nucleus by ALMA.

Landslides and avalanches could be important to keep a comet active for a long time

An article published in the journal “Icarus” describes a research focused on the link between landslides and avalanches with the long-term activity of the comet 67P/Churyumov-Gerasimenko. Jordan K. Steckloff and Nalin H. Samarasinha of the Planetary Science Institute examined data collected by ESA’s Rosetta space probe in the course of its mission to conclude that those phenomena occurring on the surface of the comet, with the resulting waste of mass, are a key to keeping it active in the long term.

Artist's impression of ‘Oumuamua with its emissions (Image ESA/Hubble, NASA, ESO, M. Kornmesser)

An article published in the journal “Nature” describes a research on the interstellar asteroid 1I/2017 U1 ‘Oumuamua whose authors believe that after all it’s a comet as its discoverers initially thought. A team of researchers led by Marco Micheli from the ESA SSA-NEO Coordination Center in Frascati, Italy, used observations made with the Hubble Space Telescope and various ground-based telescopes to follow ‘Oumuamua’s trajectory finding that it was different from the one calculated taking into account the various gravitational influences. The conclusion is that there’s a cometary activity that generates an additional boost.

Sputnik Planitia

An article published in the journal “Icarus” describes a research that offers an explanation for the formation of the dwarf planet Pluto. A team of scientists from the Southwest Research Institute (SwRI) put together data collected by NASA’s New Horizons space probe and data collected by ESA’s Rosetta space probe, which studied comet 67P/Churyumov-Gerasimenko, concluding that Pluto formed by the union of about a billion comets similar to it.

The comet 67P/Churyumov-Gerasimenko on August 6, 2014 (Image ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

An article published in the journal “Nature Astronomy” describes a research that offers new clues about the comet 67P/Churyumov-Gerasimenko’s formation. A team led by Stephen Schwartz of the University of Côte d’Azur and the University of Arizona conducted a series of computer simulations to study the formation of comets like this one, formed by two lobes, expanding previous studies confirming them and offering an explanation to some of its characteristics.