2013A&A...552A..85J


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET22:07:29

2013A&A...552A..85J - Astronomy and Astrophysics, volume 552A, 85-85 (2013/4-1)

Mineralogical investigation of several Qp asteroids and their relation to the Vesta family.

JASMIM F.L., LAZZARO D., CARVANO J.M.F., MOTHE-DINIZ T. and HASSELMANN P.H.

Abstract (from CDS):

To take advantage of the large dataset provided by the SDSS data, recently a new taxonomic scheme was proposed designed to be compatible with previous taxonomies. One interesting feature in this distribution is the large number of Qp asteroids scattered all around the main belt with a marked concentration in the Vesta region, where the Vp are found most frequently. Since the mineralogy and thermal evolution traditionally related to the classical Q- and V-type taxonomic classes (and by construction the Qp and Vp), this finding was quite surprising. We aim to observationally determine the mineralogy of a sample of Qp asteroids of and outside the Vesta family to test whether the Qp of the Vesta family are indeed basaltic, and whether the difference in band depth implied by the SDSS spectra relates to diffences in mineralogy with respect to the Vp. Moreover, we aim to determine whether the Qp outside Vesta family have an ordinary chondrite (OC) mineralogy and whether their spectra indeed correspond to Q-class asteroids. We observed a sample of asteroids classified as Qp-type in the literature, mainly located in the Vesta family and neighborhood, to confirm their mineralogy. Spectroscopic observations of 11 asteroids were obtained at the SOAR and IRTF telescopes in the visible and near-infrared region. Thermal observations of three objects were also carried out at the Gemini South telescope in order to determine the albedo of the asteroids. The analysis indicated that all observed asteroids in the Vesta vicinity have a basalt-rich mineralogy, with no clear difference from other Vesta family members in terms of silicate composition. From our study it is not clear why these particular basaltic asteroids have a relatively suppressed band I so that they are classified as Qp. Two asteroids with an OC-compatible mineralogy were identified in the external part of the main belt, at around 2.8-2.9AU. This discovery suggests new dynamical routes for the transport of Q-type asteroids to the near-Earth region and of OC meteorites to the Earth.

Abstract Copyright:

Journal keyword(s): instrumentation: spectrographs - techniques: imaging spectroscopy - minor planets, asteroids: general - methods: data analysis

Simbad objects: 8

goto Full paper

goto View the reference in ADS

Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * 80 Cet PM* 02 36 00.0479359493 -07 49 53.749900838   7.088 5.535     M0/1III 45 0
2 HD 139287 PM* 15 37 18.1482181279 -00 09 49.690868022   9.04 8.44     G2/3V 31 0
3 HD 139464 * 15 39 00.7660804490 -21 16 23.824492990   10.00 9.58     F0V 8 0
4 * 18 Sco PM* 16 15 37.2703721200 -08 22 09.981989277   6.15 5.50     G2Va 471 0
5 * 7 Aqr ** 20 56 54.0262588970 -09 41 51.160983576   6.971 5.483     K4III 37 1
6 BD-00 4251B PM* 21 42 27.4495774669 +00 26 20.346297888   9.76 9.14     F8 25 0
7 * tau Aqr * 22 49 35.5015682 -13 35 33.476641 7.51 5.57 3.98 2.79 1.84 M0III 76 0
8 BD-00 4557 PM* 23 42 41.8263315718 +00 45 13.136892747 10.411 10.305 9.693 9.339 8.991 F8 49 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2013A&A...552A..85J and select 'bookmark this link' or equivalent in the popup menu


2019.12.12-22:07:29

© Université de Strasbourg/CNRS

    • Contact