Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog



Gianluca Masi
Physics Department, University of Rome "Tor Vergata"
Viale della Ricerca Scientifica, 1, I-00100 Roma, Italy

Sergio Foglia
Osservatorio Astronomico di Suno
C. Gariboldi 11, I-28100 Novara Veveri NO, Italy

and

Richard P. Binzel
Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139






Abstract:

The 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog (SDSS MOC3) has been 
compared with visible wavelength spectra available from the Small Main-Belt Asteroid
Spectroscopic Survey (SMASS). Using 149 objects in common to both surveys, we create a
translation from SDSS colors to the SMASS taxonomic system developed by Bus (1999) allowing
40313 asteroids to be broadly categorized as being most similar to S-types, C-types, and V-types.
Our particular objective is to find unusual objects for follow-up spectroscopy, such as V-types, for
which our candidate list is in good agreement with an independent analysis by Roig and Gil-Hutton
(2006). A direct test of our V-type predictions by follow-up spectroscopic measurements confirms
a V-type taxonomy for five of the six objects sampled. Most interestingly, our SDSS
characterization correctly predicted the V-type nature for asteroid (21238) 1995 WV7, which is
located at 2.54 AU, far from Vesta, on the far side of the 3:1 mean motion resonance. Asteroid
21238 may be a new example of a basaltic achondrite asteroid having no connection to Vesta.


PDF file of paper submitted to Astronomy & Astrophysics

Classified Asteroids from SDSS MOC 3





SMASS synthetic proper elements distibution (a, sin i) - 1341 asteroids



SDSS synthetic proper elements distibution (a, sin i) - 40313 asteroids



Heliocentric distribution for each class in the main asteroid belt.






Related Papers:


Prediction and Confirmation of V-type Asteroids Beyond 2.5 AU Based on SDSS Colors
American Astronomical Society, DPS meeting 2006
Binzel R. P., Masi G., Foglia S.


Searching for V-type and Q-type Main-Belt Asteroids Based on SDSS Colors
38th Lunar and Planetary Science Conference, (Lunar and Planetary Science XXXVIII), 2007
Binzel R. P., Masi G., Foglia S., Vernazza P., Burbine T. H., Thomas C. A., Demeo F. E., Nesvorny D., Birlan M., Fulchignoni, M.





Related Links:

Small Main-Belt Asteroid Spectroscopic Survey - SMASS

Sloan Digital Sky Survey - SDSS

Asteroid Dynamic Site