2025年10月13日
柠檬树
影像提供与版权: Uroš Fink
说明: 这棵树没有危险。这是因为照片中它上方的彗星C/2025 A6（彗星莱蒙）其实离地球非常遥远。彗星莱蒙目前在穿越内太阳系的过程中持续变亮，尽管它已经通过了最接近太阳的点，但现在正逐渐接近地球。下周当它与地球距离缩短至约太阳与地球距离的一半时，预计会达到最大亮度。届时彗星莱蒙可能肉眼可见，但更有可能能用手机相机拍摄到——前提是你知道往哪个方向观察。彗星莱蒙先前在清晨最容易看到，如今北半球观测者也能在傍晚的天空中看到它: 日落后朝西方地平线上方寻找即可。这张精选照片以一棵毫无防备的欧洲山毛榉树为中心，约于十天前在斯洛文尼亚拍摄。
明日的图片: unusual space globule
Due to the lapse in federal government funding, NASA is not updating APOD website. We sincerely regret this inconvenience.
由于美国联邦政府资金中断，NASA目前暂停更新APOD网站。对此带来的不便，我们深感抱歉。
英文原文:
Explanation: The tree is not in danger. That’s because the comet pictured just above it, Comet C/2025 A6 (Lemmon) , is far in the distance, well away from the Earth. Comet Lemmon now continues to brighten as it arcs through the inner Solar System , even though it has passed its nearest to the Sun — because it is now approaching the Earth . The comet will likely appear brightest when it is at its closest to the Earth next week, then closing to about half the Earth-Sun distance . Comet Lemmon may then be visible to the unaided eye, but it is more likely to be imaged by a camera phone — if you know where to look . Comet Lemmon, previously best visible in the morning, is now also visible in the evening sky for northern observers: look above the western horizon just after sunset. The featured image was taken in Slovenia about a week ago.
