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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71338

    Title: 泛星計畫觀測之短週期彗星在遠距離彗髮活動之光度分析與軌道動力學研究;Photometric Analysis and Dynamic Study of Short Period Comets with Distant Coma Activities from Pan-STARRS 1 Survey
    Authors: 鄭宇棋;Cheng,Yu-Chi
    Contributors: 天文研究所
    Keywords: 太陽系;彗星;巡天;軌道模擬;Solar system;Comet;Sky Survey;Orbital simulation
    Date: 2016-08-19
    Issue Date: 2016-10-13 12:45:20 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 在這份研究中,我研發了一個系統化的流程,用以處理巡天計畫(泛星計畫與帕洛馬巡天)所拍攝到的木族彗星影像。影像分析程式有三個主要功能:挖掘出有拍攝到彗星的觀測影像;辨認彗星是否有噴發活動;並且測量彗星的活躍程度。一般來說,彗星活動主要是由水冰的揮發作用所主導,在這裡我採用了水的雪線作為判斷標準,將所以分析過的木族彗星根據其特性分為四個類別:典型活動彗星,彗星活動只出現在雪線範圍內;非典型活動彗星,在雪線外仍可能發生彗星噴發活動;低度活躍彗星,在觀測影像中不曾出現過彗星活動;以及無法偵測到的彗星,彗星訊號不曾出現在預測的影像區域。

    我同時也使用Mercury軟體來分析木族彗星的動力學特徵。結合觀測資料與軌道數值模擬,由於彗星核心保存的揮發性物質是有限的,我們可以建立起彗星活動特性與動力學時間尺度兩者之間的關聯。論文中詳細的討論了造成彗星活動如此多變的可能原因。;I developed a systematic method to analyze the snapshot images from sky survey projects such as the Pan-STARRS 1 (PS1) and Palomar Transient Factory (PTF) on all the numbered Jupiter Family Comets (JFCs). There are three objectives for my image processing pipeline to handling the five years survey data: to find out images that contains target of interest; to identify the signature of coma activity; and to measure the level of outgassing activity. Given that cometary activities are generally triggered by the sublimation of water ice, I introduce the water ice snowline at 3 au as an indicator for the comet classification. All comets analyzed in this work are classified into four groups based on its behaviors: regular active comets with coma activities within the snowline only, abnormal active comets with coma activities detected beyond the snowline, low active comets that are always inactive and appear as point-like sources, and undetectable comets.

    I also use the Mercury integrator to study dynamic features of JFCs by numerical methods. Combining the observational and numerical results, a connection between active behaviors and dynamics has been established: due to the limited amount of volatiles in the cometary nuclei, dynamic age roughly reflects the appearance of cometary activity. A detail discussion is given in this thesis for possible explanations of various cometary activities.
    Appears in Collections:[天文研究所] 博碩士論文

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