Solar-Radiation Heating Effects on 3200 Phaethon
Abstract Apollo-type near-Earth asteroid 3200 Phaethon, having a small perihelion distance of $q$$\sim$ 0.14 AU, is classified as F- or B-type, one of subclasses among the C-complex (C-, G-, B-, and F-types) asteroids. The F/B-type asteroids and dehydrated CI and CM carbonaceous chondrites, which ar...
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croxfordunivpr:10.1093/pasj/61.6.1375 2024-09-15T18:24:57+00:00 Solar-Radiation Heating Effects on 3200 Phaethon Ohtsuka, Katsuhito Nakato, Aiko Nakamura, Tomoki Kinoshita, Daisuke Ito, Takashi Yoshikawa, Makoto Hasegawa, Sunao 2009 http://dx.doi.org/10.1093/pasj/61.6.1375 https://academic.oup.com/pasj/article-pdf/61/6/1375/54697127/pasj_61_6_1375.pdf en eng Oxford University Press (OUP) Publications of the Astronomical Society of Japan volume 61, issue 6, page 1375-1387 ISSN 2053-051X 0004-6264 journal-article 2009 croxfordunivpr https://doi.org/10.1093/pasj/61.6.1375 2024-08-27T04:16:16Z Abstract Apollo-type near-Earth asteroid 3200 Phaethon, having a small perihelion distance of $q$$\sim$ 0.14 AU, is classified as F- or B-type, one of subclasses among the C-complex (C-, G-, B-, and F-types) asteroids. The F/B-type asteroids and dehydrated CI and CM carbonaceous chondrites, which are regarded as being linked to each other, underwent a thermal history of high-temperature heatings at more than hundreds of degrees and dehydration for a certain period of time after aqueous alteration in their parent bodies. However, their primary heating mechanism and its timing are less certain and still controversial. We have investigated solar-radiation heating effects on Phaethon at the present planetary-epoch. As a consequence, we have found that the effects on Phaethon, if it is still hydrated, might indeed be a likely candidate for the primary metamorphic heat source. We also found that solar-radiation heating on Phaethon is a function of the latitude, since Phaethon has a highly tilted polar axis. Thus, the northern hemisphere would be selectively more heated than the southern hemisphere. Therefore, we hypothesized that the northern hemisphere, especially the north pole–northern midlatitude region, would be more thermally metamorphosed and dehydrated, if solar-radiation heating is the primary metamorphic heat source of Phaethon. This may provide the latitude-dependent color variations on Phaethon’s surface, although this has not been proven by the existing Phaethon’s spectral data. Article in Journal/Newspaper North Pole Oxford University Press Publications of the Astronomical Society of Japan 61 6 1375 1387 |
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Abstract Apollo-type near-Earth asteroid 3200 Phaethon, having a small perihelion distance of $q$$\sim$ 0.14 AU, is classified as F- or B-type, one of subclasses among the C-complex (C-, G-, B-, and F-types) asteroids. The F/B-type asteroids and dehydrated CI and CM carbonaceous chondrites, which are regarded as being linked to each other, underwent a thermal history of high-temperature heatings at more than hundreds of degrees and dehydration for a certain period of time after aqueous alteration in their parent bodies. However, their primary heating mechanism and its timing are less certain and still controversial. We have investigated solar-radiation heating effects on Phaethon at the present planetary-epoch. As a consequence, we have found that the effects on Phaethon, if it is still hydrated, might indeed be a likely candidate for the primary metamorphic heat source. We also found that solar-radiation heating on Phaethon is a function of the latitude, since Phaethon has a highly tilted polar axis. Thus, the northern hemisphere would be selectively more heated than the southern hemisphere. Therefore, we hypothesized that the northern hemisphere, especially the north pole–northern midlatitude region, would be more thermally metamorphosed and dehydrated, if solar-radiation heating is the primary metamorphic heat source of Phaethon. This may provide the latitude-dependent color variations on Phaethon’s surface, although this has not been proven by the existing Phaethon’s spectral data. |
format |
Article in Journal/Newspaper |
author |
Ohtsuka, Katsuhito Nakato, Aiko Nakamura, Tomoki Kinoshita, Daisuke Ito, Takashi Yoshikawa, Makoto Hasegawa, Sunao |
spellingShingle |
Ohtsuka, Katsuhito Nakato, Aiko Nakamura, Tomoki Kinoshita, Daisuke Ito, Takashi Yoshikawa, Makoto Hasegawa, Sunao Solar-Radiation Heating Effects on 3200 Phaethon |
author_facet |
Ohtsuka, Katsuhito Nakato, Aiko Nakamura, Tomoki Kinoshita, Daisuke Ito, Takashi Yoshikawa, Makoto Hasegawa, Sunao |
author_sort |
Ohtsuka, Katsuhito |
title |
Solar-Radiation Heating Effects on 3200 Phaethon |
title_short |
Solar-Radiation Heating Effects on 3200 Phaethon |
title_full |
Solar-Radiation Heating Effects on 3200 Phaethon |
title_fullStr |
Solar-Radiation Heating Effects on 3200 Phaethon |
title_full_unstemmed |
Solar-Radiation Heating Effects on 3200 Phaethon |
title_sort |
solar-radiation heating effects on 3200 phaethon |
publisher |
Oxford University Press (OUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1093/pasj/61.6.1375 https://academic.oup.com/pasj/article-pdf/61/6/1375/54697127/pasj_61_6_1375.pdf |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
Publications of the Astronomical Society of Japan volume 61, issue 6, page 1375-1387 ISSN 2053-051X 0004-6264 |
op_doi |
https://doi.org/10.1093/pasj/61.6.1375 |
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Publications of the Astronomical Society of Japan |
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61 |
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6 |
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1375 |
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1387 |
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1810465353430466560 |