Home >

news Help

Publication Information


Title
Japanese: 
English:2014-2015 Multiple Outbursts of 15P/Finlay 
Author
Japanese: Masateru Ishiguro, Daisuke Kuroda, Hidekazu Hanayama, Yuna Grace Kwon, Yoonyoung Kim, Myung Gyoon Lee, Makoto Watanabe, Hiroshi Akitaya, Koji Kawabata, 伊藤 亮介, Tatsuya Nakaoka, 吉田 道利, Masataka Imai, Yuki Sarugaku, Kenshi Yanagisawa, Kouji Ohta, 河合 誠之, Takeshi Miyaji, Hideo Fukushima, Satoshi Honda, Jun Takahashi, Mikiya Sato, Jeremie J. Vaubaillon, Jun-ichi Watanabe.  
English: Masateru Ishiguro, Daisuke Kuroda, Hidekazu Hanayama, Yuna Grace Kwon, Yoonyoung Kim, Myung Gyoon Lee, Makoto Watanabe, Hiroshi Akitaya, Koji Kawabata, Ryosuke Itoh, Tatsuya Nakaoka, Michitoshi Yoshida, Masataka Imai, Yuki Sarugaku, Kenshi Yanagisawa, Kouji Ohta, Nobuyuki Kawai, Takeshi Miyaji, Hideo Fukushima, Satoshi Honda, Jun Takahashi, Mikiya Sato, Jeremie J. Vaubaillon, Jun-ichi Watanabe.  
Language English 
Journal/Book name
Japanese: 
English:The Astrophysical journal 
Volume, Number, Page Volume 152    Number 6   
Published date Nov. 21, 2016 
Publisher
Japanese: 
English:IOP Publishing 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://iopscience.iop.org/article/10.3847/0004-6256/152/6/169/meta
 
DOI https://doi.org/10.3847/0004-6256/152/6/169
Abstract Multiple outbursts of a Jupiter-family comet (JFC), 15P/Finlay, occurred from late 2014 to early 2015. We conducted an observation of the comet after the first outburst and subsequently witnessed another outburst on 2015 January 15.6-15.7. The gas, consisting mostly of C2 and CN, and dust particles expanded at speeds of 1110 ± 180 m s-1 and 570 ± 40 m s-1 at a heliocentric distance of 1.0 au. We estimated the maximum ratio of solar radiation pressure with respect to the solar gravity β max = 1.6 ± 0.2, which is consistent with porous dust particles composed of silicates and organics. We found that 108-109 kg of dust particles (assumed to be 0.3 μm-1 mm) were ejected through each outburst. Although the total mass is three orders of magnitude smaller than that of the 17P/Holmes event observed in 2007, the kinetic energy per unit mass (104 J kg-1) is equivalent to the estimated values of 17P/Holmes and 332P/2010 V1 (Ikeya-Murakami), suggesting that the outbursts were caused by a similar physical mechanism. From a survey of cometary outbursts on the basis of voluntary reports, we conjecture that 15P/Finlay-class outbursts occur 〉1.5 times annually and inject dust particles from JFCs and Encke-type comets into interplanetary space at a rate of ̃10 kg s-1 or more.

©2007 Tokyo Institute of Technology All rights reserved.