2007A&A...461..751L


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.22CEST01:32:48

2007A&A...461..751L - Astronomy and Astrophysics, volume 461, 751-757 (2007/1-2)

The nature of comet-asteroid transition object (3200) Phaethon.

LICANDRO J., CAMPINS H., MOTHE-DINIZ T., PINILLA-ALONSO N. and DE LEON J.

Abstract (from CDS):

The study of asteroids that present sporadic cometary activity is of fundamental importance to address several astronomical problems including the end states of comet nuclei, the abundance of water in main belt asteroids, and its role as a possible source of terrestial water. We studied the composition of the surface of asteroid (3200) Phaethon, a paradigmatic case of asteroid-comet transition object, in order to determine its cometary or asteroidal nature. We report visible and near infrared spectra covering the 0.35-2.4µm spectral range, obtained with the 4.2m William Herschel Telescope, the 2.5m Nordic Optical Telescope, and the Italian 3.58m Telescopio Nazionale Galileo at ``El Roque de los Muchachos'' Observatory (La Palma, Spain). Our spectrum is compared with those of meteorite samples and man-made mineral mixtures to determine possible components, modeled using multiple scattering formulations, and also compared with the spectra of comet nuclei and other comet-asteroid transitional objects. Phaethon's spectrum does not show any sharp structure and has a negative slope at wavelengths >0.43µm, consistent with B-type asteroids. Below 0.43µm the reflectance decreases. The spectral shape is similar to that of aqueously altered CI/CM meteorites and of hydrated minerals. A surface composition with hydrated silicates is also suggested by the models. A possible spectral variability in the UV is suggested by the avaliable spectra, and is compatible with a slightly different abundance of hydrated silicates. Finally, Phaethon's spectrum shows important differences with the few comet nuclei properly observed at these wavelengths and is similar to the spectra of other peculiar comet-asteroid transition objects. The spectral properties and dynamical properties of (3200) Phaethon support an asteroidal nature rather than a cometary one. Phaethon is more likely an ``activated'' asteroid, similar to the population of activated asteroids in the Main Belt Comets, than an extinct comet.

Abstract Copyright:

Journal keyword(s): minor planets, asteroids - comets: general

CDS comments: Paragraph 2. star Hyades 64 not identified.

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 11532 PM* 01 53 18.3712379665 +00 22 23.275219132   10.36 9.71     G8III/IV 46 1
2 HD 292561 * 06 51 33.7279121561 -00 11 31.522487958 11.277 11.183 10.574 10.226 9.905 F8 40 0
3 GSC 02581-02323 * 16 31 33.8125078770 +30 08 46.398483547 13.576 12.972 12.917 12.564 12.212 G2V 61 0
4 BD-00 4074 * 20 43 11.9568844973 +00 26 13.072595097   10.63 9.90     F8 26 0
5 BD-00 4557 PM* 23 42 41.8263315718 +00 45 13.136892747 10.411 10.305 9.693 9.339 8.991 F8 47 0

    Equat.    Gal    SGal    Ecl

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2019.08.22-01:32:48

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