Solar-Radiation Heating Effects on 3200 Phaethon

Details Solar-Radiation Heating Effects on 3200 Phaethon Solar-Radiation Heating Effects on 3200 Phaethon

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61.1375o&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.6, pp.1375--1387

Astronomy and Astrophysics

Astronomy

3

Minor Planets, Asteroids, Solar System: Formation

Scientific paper

Apollo-type near-Earth asteroid 3200 Phaethon, having a small perihelion distance of q ˜ 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.

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