Published January 1, 2020 | Version v1
Journal article Open

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

Creators

  • 1. Charles Univ Prague, Fac Math & Phys, Astron Inst, V Holesovickach 2, CR-18000 Prague 8, Czech Republic
  • 2. Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
  • 3. Chungbuk Natl Univ, 1 Chungdae Ro, Cheongju 28644, Chungbuk, South Korea
  • 4. FMPI UK, Modra Observ, Dept Astron Phys Earth & Meteorol, Bratislava 84248, Slovakia
  • 5. Sugarloaf Mt Observ, South Deerfield, MA USA
  • 6. Adam Mickiewicz Univ, Astron Observ Inst, Fac Phys, Sloneczna 36, PL-60286 Poznan, Poland
  • 7. Akdeniz Univ, Dept Space Sci & Technol, TR-07058 Antalya, Turkey
  • 8. CSIC, Inst Astrofis Andalucia, Dept Sistema Solar, Glorieta Astron S-N, E-18008 Granada, Spain

Description

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.

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