천문학회지 (Journal of The Korean Astronomical Society)

  • 제50권3호
  • /
  • Pages.41-49
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  • 2017
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  • 1225-4614(pISSN)
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  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
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PHOTOMETRIC STUDY OF NPA ROTATOR (5247) KRYLOV

  • Lee, Hee-Jae (Department of Astronomy and Space Science, Chungbuk National University) ;
  • Moon, Hong-Kyu (Korea Astronomy and Space Science Institute) ;
  • Kim, Myung-Jin (Korea Astronomy and Space Science Institute) ;
  • Kim, Chun-Hwey (Department of Astronomy and Space Science, Chungbuk National University) ;
  • Durech, Josef (Institute of Astronomy, Faculty of Mathematics and Physics, Charles University) ;
  • Choi, Young-Jun (Korea Astronomy and Space Science Institute) ;
  • Oh, Young-Seok (Korea Astronomy and Space Science Institute) ;
  • Park, Jintae (Korea Astronomy and Space Science Institute) ;
  • Roh, Dong-Goo (Korea Astronomy and Space Science Institute) ;
  • Yim, Hong-Suh (Korea Astronomy and Space Science Institute) ;
  • Cha, Sang-Mok (Korea Astronomy and Space Science Institute) ;
  • Lee, Yongseok (Korea Astronomy and Space Science Institute)
  • 투고 : 2017.03.31
  • 심사 : 2017.05.08
  • 발행 : 2017.06.30
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초록

We conduct BVRI and R band photometric observations of asteroid (5247) Krylov from January 2016 to April 2016 for 51 nights using the Korea Microlensing Telescope Network (KMTNet). The color indices of (5247) Krylov at the light curve maxima are determined as $B-V=0.841{\pm}0.035$, $V-R=0.418{\pm}0.031$, and $V-I=0.871{\pm}0.031$ where the phase angle is $14.1^{\circ}$. They are acquired after the standardization of BVRI instrumental measurements using the ensemble normalization technique. Based on the color indices, (5247) Krylov is classified as a S-type asteroid. Double periods, that is, a primary period $P_1=82.188{\pm}0.013h$ and a secondary period $P_2=67.13{\pm}0.20h$ are identified from period searches of its R band light curve. The light curve phases with $P_1$ and this indicate that it is a typical Non-Principal Axis (NPA) asteroid. We discuss the possible causes of its NPA rotation.

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