木星上海豚云的增强影像
影像来源与版权:NASA, Juno, SwRI, MSSS; Processing: Gerald Eichstädt & Avi Solomon

说明:你看到木星上海豚形状的云了吗?这片云是去年由NASA的朱诺号宇宙飞船在飞掠近木星点(perijove 16)时发现的,这是朱诺号自2016年年中到达木星以来,第十六次经过木星附近。每一次飞掠近木星点时,朱诺号都会经过木星云顶稍有不同的部分区域。海豚形状的云可能会令人惊讶,但它并没有科学意义,因为木星和地球上的云都在不停移动,能够暂时模拟出许多熟悉的形状。这片云出现在木星的南温带(STB),它是一条环绕行星的黑暗下沉云带,其中还包含名为小红斑的卵斑BA。这幅特征影像进行数位处理之后,增强了色彩和对比度。朱诺号下一次飞掠近木星点(perijove 20)将发生在5月下旬。
翻译:北京天文馆

Enhanced: The Dolphin Cloud on Jupiter
Image Credit & Copyright: NASA, Juno, SwRI, MSSS; Processing: Gerald Eichstädt & Avi Solomon

Explanation: Do you see the dolphin-shaped cloud on Jupiter? The cloud was visible last year during perijove 16, the sixteenth time that NASA’s robotic spacecraft Juno passed near Jupiter since it arrived in mid-2016. During each perijove, Juno passes near a slightly different part of Jupiter’s cloud tops. The dolphin shape may be surprising but is not scientifically significant — clouds on Jupiter and Earth are constantly shifting and can temporarily mimic many familiar shapes. The cloud appears in Jupiter’s South Temperate Belt (STB), a band of dark and dropping clouds that rings the planet and also contains Oval BA, dubbed Red Spot Jr. The featured image was digitally processed to enhance color and contrast. Juno’s next swoop near Jupiter — perijove 20 — will occur on late May.
Astronomy Picture of the Day 04/15/2019