Shape model and spin state of non-principal axis rotator (5247) Krylov

DOI: 
10.1051/0004-6361/201936808
Publication date: 
02/06/2020
Main author: 
Lee H.-J.
IAA authors: 
Duffard, R.
Authors: 
Lee H.-J., Ďurech J., Kim M.-J., Moon H.-K., Kim C.-H., Choi Y.-J., Galád A., Pray D., Marciniak A., Kaplan M., Erece O., Duffard R., Gajdoš Š., Világi J., Lehký M.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
635.0
Pages: 
A137
Number: 
A137
Abstract: 
Context. The study of non-principal axis (NPA) rotators can provide important clues to the evolution of the spin state of asteroids. However, very few studies to date have focused on NPA-rotating main belt asteroids (MBAs). One MBA known to be in an excited rotation state is asteroid (5247) Krylov. Aims. By using disk-integrated photometric data, we construct a physical model of (5247) Krylov including shape and spin state. Methods. We applied the light curve convex inversion method employing optical light curves obtained by using ground-based telescopes in three apparitions during 2006, 2016, and 2017, along with infrared light curves obtained by the Wide-field Infrared Survey Explorer satellite in 2010. Results. Asteroid (5247) Krylov is spinning in a short axis mode characterized by rotation and precession periods of 368.7 and 67.27 h, respectively. The angular momentum vector orientation of Krylov is found to be λL = 298° and βL =-58°. The ratio of the rotational kinetic energy to the basic spin-state energy EE0 1.02 shows that the (5247) Krylov is about 2% excited state compared to the principal axis rotation state. The shape of (5247) Krylov can be approximated by an elongated prolate ellipsoid with a ratio of moments of inertia of Ia: Ib: Ic = 0.36: 0.96: 1. This is the first physical model of an NPA rotator among MBAs. The physical processes that led to the current NPA rotation cannot be unambiguously reconstructed. © 2020 ESO.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020A&A...635A.137L/abstract
ADS Bibcode: 
2020A&A...635A.137L
Keywords: 
Minor planets, asteroids: individual: (5247) Krylov; Techniques: photometric