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55 Nights with Saturn Image Credit & Copyright: Tunc Tezel Explanation: For 55 consecutive nights Mediterraneanskies were at least partly clear this summer, from the 1st of July to the 24th of August 2018. An exposure from each night was incorporated in this compositedtelephoto and telescopic image to follow bright planet Saturn as it wanderedthrough the generous evening skies. Through August, the outer planet's seasonalapparent retrograde motion slowed and drifted to the right, framed by a starrybackground. That brought it near the line-of-sight to the central Milky Way,and the beautiful Lagoon (M8) and Trifid (M20) nebulae. Of course Saturn'slargest moon Titan was also along for the ride. Swinging around the gas giantin a 16 day long orbit, Titan's resulting wave-like motion is easier to spotwhen the almost-too-bright Saturn is digitally edited from the scene. 連續(xù)55個夜晚的土星 從2018年7月1日到8月24日，連續(xù)55個夜晚，地中海的夏日夜空都至少是部分晴朗的。明亮的土星漫步在這廣闊的夜空之中，這是連續(xù)55個夜晚所曝光的圖像與遠(yuǎn)攝和望遠(yuǎn)鏡影像合成的結(jié)果。在整個八月，這顆遠(yuǎn)日行星季節(jié)性的逆行運(yùn)動開始明顯減緩，并且向圖像右側(cè)移動。沿著土星的移動軌跡，我們的視線接近了銀河系的中央以及美麗的礁湖星云和三葉星云。土星最大的衛(wèi)星土衛(wèi)六（泰坦）自然追隨著土星的腳步。土衛(wèi)六每16天圍繞這顆氣態(tài)行星公轉(zhuǎn)一圈。當(dāng)明亮的土星通過數(shù)字處理后，土衛(wèi)六像波浪一樣的運(yùn)動軌跡就很容易被發(fā)現(xiàn)了。 參考文獻(xiàn)： https://apod./apod/image/1809/Saturn2018hd.jpg 近期文章： Astronomy Picture of the Day——流星劃過星系 |
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