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週末凌晨最美星團遇上明亮行星,水星、金星重逢暮光中 - 好視新聞網
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週末凌晨最美星團遇上明亮行星,水星、金星重逢暮光中
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週末凌晨最美星團遇上明亮行星,水星、金星重逢暮光中

7月20日(六)凌晨,夜空中最美麗的星團「昴宿星團」與「畢宿星團」將與明亮易辨的火星與木星,各以約5度的間距平行排列,在東方天空勾勒出一個由行星和星團構成的矩形,也是藉由明亮行星辨認、觀賞這兩個星團的好機會。7月22日(一)則是「水星東大距」,在此前後數日傍晚,久未相遇的水星和金星這兩顆內側行星,終於將在西方低空重逢。

目前亮度0.9等,紅色易辨的火星,以及-2.1等的明亮木星都位於金牛座,凌晨1時許自東方升起,雙雙進入最佳觀賞期。週末凌晨,它們恰好各自接近肉眼可見的「昴宿星團」與「畢宿星團」,成為辨識這兩個夜空中最美星團的極佳指引,在雙筒望遠鏡下的星團更彷如夜空中的寶石盒,美不勝收。此後火星與木星將逐日接近,至8月15日(四)大接近,是另一個今年不可錯過的天象美景。

自7月16日水星於日落時達最大仰角,至22日「水星東大距」這段期間,都是今年觀賞水星的最佳時機。在傍晚19時之後逐漸轉暗的西方天空中,不難看見仰角約15度,亮度0.4等的水星,右下方另一顆高度僅約6度,但亮達-3.7等的是金星,在暮光中以雙筒望遠鏡更容易找到它們,是一舉觀賞這兩顆太陽系內側行星的好機會。此後水星將逐漸靠向太陽,退出傍晚的天空舞台,西方夜空改由金星接棒,持續閃耀至年底。相關資訊請參閱臺北天文館網站「天象預報」。

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