Study the Jupiter Family Comets from Pan-STARRS 1 Data
Yu-Chi Cheng1*, Hsing-Wen Lin1, Wing-Huen Ip1,2,3, Wen-Ping Chen1
1Institute of Astronomy, National Central University, Taoyuan City, Taiwan
2Institute of Space Science, National Central University, Taoyuan City, Taiwan
3Space Science Institute, Macau University of Science and Technology, Macau, Macau
* presenting author:YUCHI CHENG, email:982409002@cc.ncu.edu.tw
Pan-STARRS 1 project (hereafter PS1) is currently the latest and largest all sky survey project in the world which covered the northern sky region (Declination > -47.5 deg.). The frequent, uniform, un-selected, deep (~21 mag.) and high quality surveying data provide many applications on solar system researches. We present a systematic analysis on Jupiter Family Comets (JFCs) for the degrees of cometary activity using the Afρ quantity. In this work we generate the time-series active curve for more than 350 JFCs during the 5 years survey, trying to classify the nature of cometary activity. The un-unit parameter Afρ is a wildly-used method which reduced the periodic effect of apparent brightness due to the change of geocentric heliocentric distant.
In this moment we have categorized 4 types of JFCs from their active feature. 1) Regular active – only active during the perihelion passage; 2) Multiple outburst object – appear several outburst event which has no relation with the heliocentric distance; 3) Distant active – brighten up at very large heliocentric distant (beyond the orbit of Jupiter); 4) Inactive – always below our detecting limit during 5 years survey even it passed the perihelion.
We also found some JFCs have second outburst events after the perihelion passage. The activated heliocentric distant of such cases is around 4 AU which may possible triggered by the CO gas.


Keywords: solar system, comets