The Experts below are selected from a list of 2742 Experts worldwide ranked by ideXlab platform
A Abergel - One of the best experts on this subject based on the ideXlab platform.
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deep herschel pacs point spread functions
Astronomy and Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, which provides a characterisation of the central part and, therefore, excludes fainter features. In many cases, however, information on both the core and wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range (~10 6 ) at slow and fast scan speeds for the three photometric bands.
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deep herschel pacs point spread functions
arXiv: Instrumentation and Methods for Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, providing a characterisation of the central part therefore excluding fainter features. However, in many cases information on both the core and the wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range $(\sim 10^6)$, at slow and fast scan speeds and for the three photometric bands.
M Bocchio - One of the best experts on this subject based on the ideXlab platform.
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deep herschel pacs point spread functions
Astronomy and Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, which provides a characterisation of the central part and, therefore, excludes fainter features. In many cases, however, information on both the core and wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range (~10 6 ) at slow and fast scan speeds for the three photometric bands.
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deep herschel pacs point spread functions
arXiv: Instrumentation and Methods for Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, providing a characterisation of the central part therefore excluding fainter features. However, in many cases information on both the core and the wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range $(\sim 10^6)$, at slow and fast scan speeds and for the three photometric bands.
S Bianchi - One of the best experts on this subject based on the ideXlab platform.
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deep herschel pacs point spread functions
Astronomy and Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, which provides a characterisation of the central part and, therefore, excludes fainter features. In many cases, however, information on both the core and wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range (~10 6 ) at slow and fast scan speeds for the three photometric bands.
-
deep herschel pacs point spread functions
arXiv: Instrumentation and Methods for Astrophysics, 2016Co-Authors: M Bocchio, S Bianchi, A AbergelAbstract:The knowledge of the point spread function (PSF) of imaging instruments represents a fundamental requirement for astronomical observations. The Herschel PACS PSFs delivered by the instrument control centre are obtained from observations of the Vesta Asteroid, providing a characterisation of the central part therefore excluding fainter features. However, in many cases information on both the core and the wings of the PSFs is needed. With this aim, we combine Vesta and Mars dedicated observations and obtain PACS PSFs with an unprecedented dynamic range $(\sim 10^6)$, at slow and fast scan speeds and for the three photometric bands.
Mikael Granvik - One of the best experts on this subject based on the ideXlab platform.
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the sari c c i c c ek howardite fall in turkey source crater of hed meteorites on Vesta and impact risk of vestoids
arXiv: Earth and Planetary Astrophysics, 2021Co-Authors: Ozan Unsalan, Peter Jenniskens, Qingzhu Yin, Ersin Kaygisiz, Jim Albers, David Clark, Mikael Granvik, Iskender Demirkol, Ibrahim Y Erdogan, Aydin Sukru BenguAbstract:The Saricicek howardite meteorite shower consisting of 343 documented stones occurred on 2 September 2015 in Turkey and is the first documented howardite fall. Cosmogenic isotopes show that Saricicek experienced a complex cosmic ray exposure history, exposed during ~12-14 Ma in a regolith near the surface of a parent Asteroid, and that an ca.1 m sized meteoroid was launched by an impact 22 +/- 2 Ma ago to Earth (as did one third of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 +/- 2.5 Ma and 4553 +/- 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U-Pb age of 4525 +/- 17 Ma, K-Ar age of ~3.9 Ga, and the U,Th-He ages of 1.8 +/- 0.7 and 2.6 +/- 0.3 Ga are interpreted to represent thermal metamorphic and impact-related resetting ages, respectively. Petrographic, geochemical and O-, Cr- and Ti- isotopic studies confirm that Saricicek belongs to the normal clan of HED meteorites. Petrographic observations and analysis of organic material indicate a small portion of carbonaceous chondrite material in the Saricicek regolith and organic contamination of the meteorite after a few days on soil. Video observations of the fall show an atmospheric entry at 17.3 +/- 0.8 kms-1 from NW, fragmentations at 37, 33, 31 and 27 km altitude, and provide a pre-atmospheric orbit that is the first dynamical link between the normal HED meteorite clan and the inner Main Belt. Spectral data indicate the similarity of Saricicek with the Vesta Asteroid family spectra, a group of Asteroids stretching to delivery resonances, which includes (4) Vesta. Dynamical modeling of meteoroid delivery to Earth shows that the disruption of a ca.1 km sized Vesta family Asteroid or a ~10 km sized impact crater on Vesta is required to provide sufficient meteoroids <4 m in size to account for the influx of meteorites from this HED clan.
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the saricicek howardite fall in turkey source crater of hed meteorites on Vesta and impact risk of vestoids
Meteoritics & Planetary Science, 2019Co-Authors: Ozan Unsalan, Peter Jenniskens, Qingzhu Yin, Ersin Kaygisiz, Jim Albers, David Clark, Mikael GranvikAbstract:The Saricicek howardite meteorite shower consisting of 343 documented stones occurred on September 2, 2015 in Turkey and is the first documented howardite fall. Cosmogenic isotopes show that Saricicek experienced a complex cosmic‐ray exposure history, exposed during ~12–14 Ma in a regolith near the surface of a parent Asteroid, and that an ~1 m sized meteoroid was launched by an impact 22 ± 2 Ma ago to Earth (as did one‐third of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 ± 2.5 Ma and 4553 ± 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U‐Pb age of 4525 ± 17 Ma, K‐Ar age of ~3.9 Ga, and the U,Th‐He ages of 1.8 ± 0.7 and 2.6 ± 0.3 Ga are interpreted to represent thermal metamorphic and impact‐related resetting ages, respectively. Petrographic; geochemical; and O‐, Cr‐, and Ti‐isotopic studies confirm that Saricicek belongs to the normal clan of HED meteorites. Petrographic observations and analysis of organic material indicate a small portion of carbonaceous chondrite material in the Saricicek regolith and organic contamination of the meteorite after a few days on soil. Video observations of the fall show an atmospheric entry at 17.3 ± 0.8 km s(exp -1) from NW; fragmentations at 37, 33, 31, and 27 km altitude; and provide a pre‐atmospheric orbit that is the first dynamical link between the normal HED meteorite clan and the inner Main Belt. Spectral data indicate the similarity of Saricicek with the Vesta Asteroid family (V‐class) spectra, a group of Asteroids stretching to delivery resonances, which includes (4) Vesta. Dynamical modeling of meteoroid delivery to Earth shows that the complete disruption of a ~1 km sized Vesta family Asteroid or a ~10 km sized impact crater on Vesta is required to provide sufficient meteoroids ≤4 m in size to account for the influx of meteorites from this HED clan. The 16.7 km diameter Antionia impact crater on Vesta was formed on terrain of the same age as given by the 4He retention age of Saricicek. Lunar scaling for crater production to crater counts of its ejecta blanket show it was formed ~22 Ma ago.
Ozan Unsalan - One of the best experts on this subject based on the ideXlab platform.
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the sari c c i c c ek howardite fall in turkey source crater of hed meteorites on Vesta and impact risk of vestoids
arXiv: Earth and Planetary Astrophysics, 2021Co-Authors: Ozan Unsalan, Peter Jenniskens, Qingzhu Yin, Ersin Kaygisiz, Jim Albers, David Clark, Mikael Granvik, Iskender Demirkol, Ibrahim Y Erdogan, Aydin Sukru BenguAbstract:The Saricicek howardite meteorite shower consisting of 343 documented stones occurred on 2 September 2015 in Turkey and is the first documented howardite fall. Cosmogenic isotopes show that Saricicek experienced a complex cosmic ray exposure history, exposed during ~12-14 Ma in a regolith near the surface of a parent Asteroid, and that an ca.1 m sized meteoroid was launched by an impact 22 +/- 2 Ma ago to Earth (as did one third of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 +/- 2.5 Ma and 4553 +/- 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U-Pb age of 4525 +/- 17 Ma, K-Ar age of ~3.9 Ga, and the U,Th-He ages of 1.8 +/- 0.7 and 2.6 +/- 0.3 Ga are interpreted to represent thermal metamorphic and impact-related resetting ages, respectively. Petrographic, geochemical and O-, Cr- and Ti- isotopic studies confirm that Saricicek belongs to the normal clan of HED meteorites. Petrographic observations and analysis of organic material indicate a small portion of carbonaceous chondrite material in the Saricicek regolith and organic contamination of the meteorite after a few days on soil. Video observations of the fall show an atmospheric entry at 17.3 +/- 0.8 kms-1 from NW, fragmentations at 37, 33, 31 and 27 km altitude, and provide a pre-atmospheric orbit that is the first dynamical link between the normal HED meteorite clan and the inner Main Belt. Spectral data indicate the similarity of Saricicek with the Vesta Asteroid family spectra, a group of Asteroids stretching to delivery resonances, which includes (4) Vesta. Dynamical modeling of meteoroid delivery to Earth shows that the disruption of a ca.1 km sized Vesta family Asteroid or a ~10 km sized impact crater on Vesta is required to provide sufficient meteoroids <4 m in size to account for the influx of meteorites from this HED clan.
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the saricicek howardite fall in turkey source crater of hed meteorites on Vesta and impact risk of vestoids
Meteoritics & Planetary Science, 2019Co-Authors: Ozan Unsalan, Peter Jenniskens, Qingzhu Yin, Ersin Kaygisiz, Jim Albers, David Clark, Mikael GranvikAbstract:The Saricicek howardite meteorite shower consisting of 343 documented stones occurred on September 2, 2015 in Turkey and is the first documented howardite fall. Cosmogenic isotopes show that Saricicek experienced a complex cosmic‐ray exposure history, exposed during ~12–14 Ma in a regolith near the surface of a parent Asteroid, and that an ~1 m sized meteoroid was launched by an impact 22 ± 2 Ma ago to Earth (as did one‐third of all HED meteorites). SIMS dating of zircon and baddeleyite yielded 4550.4 ± 2.5 Ma and 4553 ± 8.8 Ma crystallization ages for the basaltic magma clasts. The apatite U‐Pb age of 4525 ± 17 Ma, K‐Ar age of ~3.9 Ga, and the U,Th‐He ages of 1.8 ± 0.7 and 2.6 ± 0.3 Ga are interpreted to represent thermal metamorphic and impact‐related resetting ages, respectively. Petrographic; geochemical; and O‐, Cr‐, and Ti‐isotopic studies confirm that Saricicek belongs to the normal clan of HED meteorites. Petrographic observations and analysis of organic material indicate a small portion of carbonaceous chondrite material in the Saricicek regolith and organic contamination of the meteorite after a few days on soil. Video observations of the fall show an atmospheric entry at 17.3 ± 0.8 km s(exp -1) from NW; fragmentations at 37, 33, 31, and 27 km altitude; and provide a pre‐atmospheric orbit that is the first dynamical link between the normal HED meteorite clan and the inner Main Belt. Spectral data indicate the similarity of Saricicek with the Vesta Asteroid family (V‐class) spectra, a group of Asteroids stretching to delivery resonances, which includes (4) Vesta. Dynamical modeling of meteoroid delivery to Earth shows that the complete disruption of a ~1 km sized Vesta family Asteroid or a ~10 km sized impact crater on Vesta is required to provide sufficient meteoroids ≤4 m in size to account for the influx of meteorites from this HED clan. The 16.7 km diameter Antionia impact crater on Vesta was formed on terrain of the same age as given by the 4He retention age of Saricicek. Lunar scaling for crater production to crater counts of its ejecta blanket show it was formed ~22 Ma ago.
