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

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Lee H. -., Durech J., Kim M. -., Moon H. -., Kım C. -., Choi Y. -., ...Daha Fazla

ASTRONOMY & ASTROPHYSICS, cilt.635, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 635
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1051/0004-6361/201936808
  • Dergi Adı: ASTRONOMY & ASTROPHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Artic & Antarctic Regions, Communication Abstracts, Compendex, INSPEC, Metadex, zbMATH, DIALNET, Civil Engineering Abstracts
  • Anahtar Kelimeler: minor planets, asteroids: individual: (5247) Krylov, techniques: photometric, ASTEROID LIGHTCURVE INVERSION, OPTIMIZATION METHODS, PHOTOMETRY
  • Akdeniz Üniversitesi Adresli: Evet

Özet

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 lambda (L) = 298 degrees and beta (L) = -58 degrees. The ratio of the rotational kinetic energy to the basic spin-state energy E/E-0 similar or equal to 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 I-a : I-b : I-c = 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.