Zobrazeno 1 - 10
of 288
pro vyhledávání: '"PenttilÄ, Antti"'
Autor:
Gray, Zuri, Bagnulo, Stefano, Granvik, Mikael, Cellino, Alberto, Jones, Geraint H., Kolokolova, Ludmilla, Moreno, Fernando, Muinonen, Karri, Muñoz, Olga, Opitom, Cyrielle, Penttilä, Antti, Snodgrass, Colin
We have monitored the Didymos-Dimorphos binary system in imaging polarimetric mode before and after the impact from the Double Asteroid Redirection Test (DART) mission. A previous spectropolarimetric study showed that the impact caused a dramatic dro
Externí odkaz:
http://arxiv.org/abs/2311.13483
We study the surface composition of asteroids with visible and/or infrared spectroscopy. For example, asteroid taxonomy is based on the spectral features or multiple color indices in visible and near-infrared wavelengths. The composition of asteroids
Externí odkaz:
http://arxiv.org/abs/2311.10954
Autor:
Markkanen, Johannes, Penttilä, Antti
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 310, 2023, 108733
The Radiative transfer coherent backscattering (RT-CB) code is extended to apply to dense discrete random media of optically soft spherical particles. This is achieved by utilizing the well-known static-structure-factor (SSF) correction derived from
Externí odkaz:
http://arxiv.org/abs/2311.12851
Publikováno v:
A&A 675, A50 (2023)
Context. Upcoming space missions will provide us with surface-resolved NEA reflectance spectra. Neural networks are useful tools for analysing reflectance spectra and determining material composition with high precision and low processing time. Aims.
Externí odkaz:
http://arxiv.org/abs/2305.05700
Publikováno v:
A&A 669, A101 (2023)
Chemical and mineral compositions of asteroids reflect the formation and history of our Solar System. This knowledge is also important for planetary defence and in-space resource utilisation. We aim to develop a fast and robust neural-network-based m
Externí odkaz:
http://arxiv.org/abs/2210.01006
Publikováno v:
In Journal of Quantitative Spectroscopy and Radiative Transfer January 2025 331
Autor:
Muinonen, Karri, Penttilä, Antti
Publikováno v:
In Journal of Quantitative Spectroscopy and Radiative Transfer September 2024 324
Publikováno v:
In Planetary and Space Science 1 October 2023 235
Autor:
Shevchenko, Vasilij G., Belskaya, Irina N., Mikhalchenko, Olga I., Muinonen, Karri, Penttilä, Antti, Gritsevich, Maria, Shkuratov, Yuriy G., Slyusarev, Ivan G., Videen, Gorden
Publikováno v:
A&A 626, A87 (2019)
The values of the phase integral q were determined for asteroids using (i) a numerical integration of the brightness phase functions over a wide phase-angle range and (ii) the relations between q and the G parameter of the HG-function and q and the G
Externí odkaz:
http://arxiv.org/abs/1905.09827
We show that the scattering phase functions of the coma and the nucleus of the comet 67P/Churyumov-Gerasimenko measured by the Rosetta/OSIRIS instrument can be reproduced by a particle model involving clustered densely packed submicrometer-sized grai
Externí odkaz:
http://arxiv.org/abs/1811.03899