Differentiation signatures in the Flora region

Most asteroid families are very homogeneous in physical properties. Some show greater diversity, however. The Flora family is the most intriguing of them. The Flora family is spread widely in the inner main belt, has a rich collisional history, and is one of the most taxonomically diverse regions in the main belt. As a result of its proximity to the asteroid (4) Vesta (the only currently known intact differentiated asteroid) and its family, migration between the two regions is possible. This dynamical path is one of the counter arguments to the hypothesis that there may be traces of a differentiated parent body other than Vesta in the inner main belt region. We here investigate the possibility that some of the V- and A- types (commonly interpreted as basaltoids and dunites - parts of the mantle and crust of differentiated parent bodies) in the Flora dynamical region are not dynamically connected to Vesta.

[1]  D. A. Oszkiewicz,et al.  Selecting asteroids for a targeted spectroscopic survey , 2014, 1408.4288.

[2]  E. Tedesco The origin of the Flora family , 1979 .

[3]  Fernando Roig,et al.  Reanalysis of asteroid families structure through visible spectroscopy , 2005 .

[4]  A. Kryszczyńska Do Slivan states exist in the Flora family? - II. Fingerprints of the Yarkovsky and YORP effects , 2013 .

[5]  Edward F. Tedesco,et al.  Asteroid Albedos and Diameters , 1994 .

[6]  Munetaka Ueno,et al.  Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey , 2011 .

[7]  A. McEwen,et al.  The Geology of Gaspra , 1994 .

[8]  T. B. Spahr,et al.  MAIN BELT ASTEROIDS WITH WISE/NEOWISE. I. PRELIMINARY ALBEDOS AND DIAMETERS , 2011, 1109.4096.

[9]  A. Morbidelli,et al.  Constraining the cometary flux through the asteroid belt during the late heavy bombardment , 2013, 1301.6221.

[10]  P. Spurny,et al.  An Anomalous Basaltic Meteorite from the Innermost Main Belt , 2009, Science.

[11]  Clark R. Chapman,et al.  Galileo's Encounter with 951 Gaspra: Overview , 1994 .

[12]  D. J. Tholen,et al.  Yarkovsky-driven impact risk analysis for asteroid (99942) Apophis , 2013, 1301.1607.

[13]  R. Duffard,et al.  S3OS2: the visible spectroscopic survey of 820 asteroids , 2004 .

[14]  M. Gaffey,et al.  Asteroids: Surface Composition from Reflection Spectroscopy , 1974, Science.

[15]  M. Kivelson,et al.  Magnetic Field Signatures Near Galileo's Closest Approach to Gaspra , 1993, Science.

[16]  Richard P. Binzel,et al.  Unexpected D-type interlopers in the inner main belt , 2013, 1312.2962.

[17]  R. Koff,et al.  An anisotropic distribution of spin vectors in asteroid families , 2013, 1309.4296.

[18]  Harold F. Levison,et al.  The Long-Term Dynamical Behavior of Short-Period Comets , 1993 .

[19]  Alessandro Morbidelli,et al.  The Flora Family: A Case of the Dynamically Dispersed Collisional Swarm? , 2002 .

[20]  G. Gyuk,et al.  AVAST survey 0.4–1.0 μm spectroscopy of igneous asteroids in the inner and middle main belt , 2012, 1202.4424.

[21]  Jennifer L. Piatek,et al.  Mineralogical Variations within the S-Type Asteroid Class , 1993 .

[22]  Andrea Milani,et al.  Asteroid family ages , 2015, 1504.05461.

[23]  A. La Spina,et al.  Retrograde spins of near-Earth asteroids from the Yarkovsky effect , 2004, Nature.

[24]  William F. Bottke,et al.  An asteroid breakup 160 Myr ago as the probable source of the K/T impactor , 2007, Nature.

[25]  J. Masiero,et al.  ASTEROID FAMILY IDENTIFICATION USING THE HIERARCHICAL CLUSTERING METHOD AND WISE/NEOWISE PHYSICAL PROPERTIES , 2013, 1305.1607.

[26]  Richard P. Binzel,et al.  Phase II of the Small Main-Belt Asteroid Spectroscopic Survey: The Observations , 2002 .

[27]  H. Matsuhara,et al.  ALBEDO PROPERTIES OF MAIN BELT ASTEROIDS BASED ON THE ALL-SKY SURVEY OF THE INFRARED ASTRONOMICAL SATELLITE AKARI , 2012, 1211.2889.

[28]  Francesca DeMeo,et al.  The taxonomic distribution of asteroids from multi-filter all-sky photometric surveys , 2013, 1307.2424.

[29]  M. Barucci,et al.  A VISIBLE SPECTROSCOPIC SURVEY OF THE FLORA CLAN , 1998 .

[30]  A. Morbidelli,et al.  Did the Hilda collisional family form during the late heavy bombardment , 2011, 1109.1114.

[31]  R. Duffard,et al.  Discovering New V-Type Asteroids in the Vicinity of 4 Vesta , 2002 .

[32]  M. Gaffey Rotational spectral variations of asteroid (8) Flora: Implications for the nature of the S-type asteroids and for the parent bodies of the ordinary chondrites , 1984 .

[33]  A. Kryszczyńska,et al.  New binary asteroid 809 Lundia - I. Photometry and modelling , 2009 .

[34]  B. Carry,et al.  Solar System evolution from compositional mapping of the asteroid belt , 2014, Nature.

[35]  Paul Mann,et al.  Chelyabinsk meteorite explains unusual spectral properties of Baptistina Asteroid Family , 2014, 1404.6666.

[36]  Alberto Cellino,et al.  Interlopers within Asteroid Families , 1995 .

[37]  M. Gaffey,et al.  Composition of 298 Baptistina: Implications for the K/T impactor link , 2009 .

[38]  R. C. Domingos,et al.  Dynamical evolution of V-type asteroids in the central main belt , 2014, 1401.6332.

[39]  Kiyotsugu Hirayama,et al.  Groups of asteroids probably of common origin , 1918 .

[40]  T V Johnson,et al.  Asteroid Vesta: Spectral Reflectivity and Compositional Implications , 1970, Science.

[41]  Clark R. Chapman,et al.  S-Type Asteroids, Ordinary Chondrites, and Space Weathering: The Evidence from Galileo's Fly-bys of Gaspra and Ida , 1996 .

[42]  S. Chesley,et al.  Nonlinear impact monitoring: line of variation searches for impactors , 2005 .

[43]  Richard P. Binzel,et al.  Small main-belt asteroid spectroscopic survey: Initial results , 1995 .

[44]  Richard Greenberg,et al.  Defining the Flora Family: Orbital properties, reflectance properties and age , 2014, 1404.6707.

[45]  Jurgen Rahe,et al.  The NASA planetary data system , 1992 .

[46]  Paul A. Abell,et al.  Olivine-dominated asteroids: Mineralogy and origin , 2013, 1310.1080.

[47]  D. Monet,et al.  Treatment of star catalog biases in asteroid astrometric observations , 2010 .

[48]  B. Gladman,et al.  Fugitives from the Vesta family , 2008 .

[49]  Z. Ivezic,et al.  Solar system objects observed in the Sloan Digital Sky Survey commissioning data , 2001 .

[50]  J. Sunshine,et al.  Olivine‐dominated asteroids and meteorites: Distinguishing nebular and igneous histories , 2007 .

[51]  On the V-type asteroids outside the Vesta family. I. Interplay of nonlinear secular resonances and the Yarkovsky effect: the cases of 956 Elisa and 809 Lundia , 2005, astro-ph/0506656.

[52]  Tomas Kohout,et al.  Mineralogy, reflectance spectra, and physical properties of the Chelyabinsk LL5 chondrite - insight into shock induced changes in asteroid regoliths , 2013, 1309.6081.

[53]  J. Licandro,et al.  V-type asteroids: A mineralogical study , 2006 .

[54]  Aniruddha R. Thakar,et al.  The Third Data Release of the Sloan Digital Sky Survey , 2004 .

[55]  P. Farinella,et al.  The Yarkovsky Seasonal Effect on Asteroidal Fragments: A Nonlinearized Theory for Spherical Bodies , 1999 .

[56]  Zeljko Ivezic,et al.  The Size Distributions of Asteroid Families in the SDSS Moving Object Catalog 4 , 2008, 0807.3762.

[57]  David E. Trilling,et al.  Online multi-parameter phase-curve fitting and application to a large corpus of asteroid photometric data , 2011 .