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Pre-discovery Activity of New Interstellar Comet 2I/Borisov Beyond 5 AU
Quanzhi Ye, Michael S. P. Kelley, Bryce T. Bolin +15
Comet 2I/Borisov, the first unambiguous interstellar comet ever found, was discovered in August 2019 at au from the Sun on its inbound leg. No pre-discovery detection beyon…
Comet 240P/NEAT is Stirring
Michael S. P. Kelley, Dennis Bodewits, Quanzhi Ye +13
Comets are primitive objects that formed in the protoplanetary disk, and have been largely preserved over the history of the Solar System. However, they are not pristine, and surfa…
Characterization of the Nucleus, Morphology and Activity of Interstellar Comet 2I/Borisov by Optical and Near-Infrared GROWTH, Apache Point, IRTF, ZTF and Keck Observations
Bryce T. Bolin, Carey M. Lisse, Mansi M. Kasliwal +52
We present visible and near-infrared photometric and spectroscopic observations of interstellar object 2I/Borisov taken from 2019 September 10 to 2019 November 29 using the GROWTH,…
Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta
C. Tubiana, G. Rinaldi, C. Güttler +53
On 27 Apr 2015, when 67P/C-G was at 1.76 au from the Sun and moving towards perihelion, the OSIRIS and VIRTIS-M instruments on Rosetta observed the evolving dust and gas coma durin…
Surface evolution of the Anhur region on comet 67P from high-resolution OSIRIS images
S. Fornasier, C. Feller, P. H. Hasselmann +34
The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The A…
Multiple Outbursts of Asteroid (6478) Gault
Quanzhi Ye, Michael S. P. Kelley, Dennis Bodewits +12
Main-belt asteroid (6478) Gault unexpectedly sprouted two tails in late 2018 and early 2019, identifying it as a new active asteroid. Here we present observations obtained by the 1…