Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids

Details Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...529a.107m&link_type=abstract

Astronomy & Astrophysics, Volume 529, id.A107

Astronomy and Astrophysics

Astrophysics

Techniques: Photometric, Minor Planets, Asteroids: General

Scientific paper

Context. The set of more than 100 asteroids, for which spin parameters have been modelled using an amplitude, magnitude or epoch methods, showed a pronounced gap in the distribution of the asteroid spin axes. These spin axes are rarely aligned with the ecliptic plane. Aims: The number of asteroids with known spin parameters should be increased to allow for statistical investigations. Methods: We gathered extensive photometric datasets on four selected main-belt asteroids to model their spin and shape parameters using the lightcurve inversion method. Our only criterion of selection was their observability for small telescopes. Results: All four of the modelled asteroids happened to have rotational poles that lie close to the ecliptic plane (periods and J2000 north pole coordinates): (94) Aurora - P = 7.226191 h, λp1 = 58°, βp1 = + 16°; λp2 = 242°, βp2 = + 4°; (174) Phaedra - P = 5.750249 h, λp = 265°, βp = + 5°; (679) Pax - P = 8.456016 h, λp1 = 42°, βp1 = -5°; λp2 = 220°, βp2 = + 32° (pole 2 preferred after comparison with AO-resolved observations); (714) Ulula - P = 6.998376 h, λp1 = 42°, βp1 = -9°; λp2 = 227°, βp2 = -14°. Conclusions: This work suggests that asteroid spin axes do not avoid the ecliptic plane, contrary to what the classical modelling suggested.
Composite lightcurves (Figs. 1-26), and aspect data (Table 1) are only available in electronic form at http://www.aanda.orgPhotometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/529/A107

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