【摘要2020.1.20.自由】◎劉宜庭
A rare asteroid orbiting snugly within the
inner confines of our solar system has been discovered by Caltech’s Zwicky
Transient Facility, or ZTF, a survey camera based at Palomar Observatory.
美國加州理工學院位於帕洛馬山天文台的「史維基瞬變設備」（ZTF）巡天鏡頭，已經發現一顆罕見的小行星，它隱蔽地運行在我們太陽系的行星軌道內側。
The newfound body, named 2020 AV2, is the
first asteroid found to orbit entirely within the orbit of Venus. 2020 AV2
belongs to a small class of asteroids known as Atiras, which are bodies with
orbits that fall within the orbit of Earth.
這顆新發現的天體，被命名為「2020 AV2」，是第一顆完全在金星軌道內運行的小行星。2020
AV2隸屬於運行軌道落在地球軌道內的「Atira」型小行星群。
The ZTF camera is particularly adept at
finding asteroids because it scans the entire sky rapidly and thus can catch
the asteroids during their short-lived appearances in the night sky.
史維基瞬變設備的鏡頭特別擅長搜尋小行星，它能快速掃視整個天空，藉此捕捉到在夜空中曇花一現的小行星。
2020 AV2 is the third Atira discovered by
ZTF as part of its Twilight program developed by Wing-Huen Ip of the National
Central University in Taiwan, and Quanzhi Ye, formerly of Caltech and now at
the University of Maryland.
2020 AV2是史維基瞬變設備發現的第三顆Atira型小行星，也是「暮光巡天」觀測計畫的一部分，該計畫由台灣中央大學的葉永烜（Wing-Huen
Ip），與早前在加州理工學院、目前在（美國）馬里蘭大學的葉泉志（Quanzhi
Ye）推動。
新聞辭典
asteroid：名詞，小行星。例句：The
asteroid spans about 1 to 3 kilometers.（這顆小行星的跨度約1至3公里。）
orbit：名詞，軌道。例句：The
asteroid has an elongated orbit tilted about 15 degrees relative to the plane
of our solar system.（這顆小行星狹長的運行軌道，傾斜於我們太陽系的軌道面約15度角。）
program：名詞，計畫、方案。例句：NASA
supports ZTF’s search for near-Earth objects.（美國航太總署支持史維基瞬變設備搜尋近地天體。）
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