Home 零对冲(ZeroHedge)每日HackerNews

哈勃望远镜捕捉到迄今为止最清晰的3I/ATLAS图像。
Hubble catches sharpest image yet of 3I/ATLAS

原始链接: https://www.skyatnightmagazine.com/news/hubble-3i-atlas-july-2025

## 哈勃望远镜捕捉到星际彗星3I/ATLAS 哈勃太空望远镜捕捉到了迄今为止星际彗星3I/ATLAS最清晰的图像，这是仅有三颗确认进入我们太阳系的星际访客之一。这颗彗星于2025年7月被发现，目前正以创纪录的速度——每小时21万公里——穿梭于我们的宇宙邻域。 哈勃的观测使天文学家能够估计彗星的彗核大小，宽度在320米到5.6公里之间，并捕捉到彗星在接近太阳时喷射出的尘埃羽流和尾巴。这位访客可能起源于另一个恒星系统，时间可追溯到数十亿年前，目前可以通过望远镜观测到，但很快将被太阳遮蔽。预计它将于2025年12月再次出现。 计划进行进一步的观测，特别是来自詹姆斯·韦伯太空望远镜的观测，以分析彗星的成分并完善我们对这些罕见星际旅行者的理解。

## 哈勃望远镜捕捉到彗星3I/ATLAS的详细图像 最近一篇Hacker News帖子展示了哈勃太空望远镜拍摄到的一张彗星3I/ATLAS的非常清晰的新图像。这颗彗星最初于2025年7月1日被发现，其彗星的分类并非立即明确。发现后不久的观测显示出微弱的彗发和潜在的彗尾，证实了它的彗星性质。 Hacker News上的用户表达了对哈勃望远镜持续为天文发现做出贡献的兴奋之情。该帖子还链接到YCombinator News上的进一步讨论以及提供有关3I/ATLAS更多详细信息的维基百科文章。这张图像展示了哈勃望远镜持续产生令人惊叹且具有科学价值观测的能力。
相关文章
原文

The Hubble Space Telescope has captured the sharpest image yet of interstellar comet 3I/ATLAS, which is currently passing through our Solar System.

Observations by Hubble have enabled astronomers to better estimate the size of the comet's nucleus, which is made of dust and ice.

Hubble managed to capture a dust plume being ejected by the comet, as well as a glimpse of a dust tail streaming away from its nucleus.

Image of interstellar comet 3I/ATLAS captured by the Hubble Space Telescope’s Wide Field Camera on 21 July 2025. Credit: NASA, ESA, D. Jewitt (UCLA); Image Processing: J. DePasquale (STScI)
Image of interstellar comet 3I/ATLAS captured by the Hubble Space Telescope’s Wide Field Camera on 21 July 2025. Credit: NASA, ESA, D. Jewitt (UCLA); Image Processing: J. DePasquale (STScI)

An interstellar visitor

3I/ATLAS is one of only three interstellar visitors ever observed passing through our Solar System, the other two being 1I/ʻOumuamua, discovered in 2017, and 2I/Borisov, discovered in 2019.

These objects originate from deep space and make a brief detour through our Solar System, then continue on their journey across the cosmos.

Comet 3I/ATLAS (2025) was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) on 1 July 2025, when it was 675 million kilometres from the Sun.

Hubble's image, captured on 21 July 2025, follows an earlier Gemini North Telescope image of 3I/ATLAS, which you can see below.

Interstellar comet 3I/ATLAS as seen by the Gemini North Telescope. Credit: International Gemini Observatory/NOIRLab/NSF/AURA/K. Meech (IfA/U. Hawaii). Image Processing: Jen Miller & Mahdi Zamani (NSF NOIRLab)
Interstellar comet 3I/ATLAS as seen by the Gemini North Telescope. Credit: International Gemini Observatory/NOIRLab/NSF/AURA/K. Meech (IfA/U. Hawaii). Image Processing: Jen Miller & Mahdi Zamani (NSF NOIRLab)

3I/ATLAS is currently visible through telescopes and will be into September 2025, but after this time it will pass too close to the Sun to be seen from Earth.

It's expected to reappear on the other side of the Sun and be visible again in early December 2025.

3I/ATLAS is traveling through our Solar System at 210,000 kilometres per hour, making it the speediest Solar System visitor ever seen.

Astronomers say its speed suggests it's been zooming through interstellar space for billions of years, sped up by the gravitational force of stars and nebulae.

Image of interstellar comet 3I/ATLAS captured by the Hubble Space Telescope’s Wide Field Camera on 21 July 2025, with scale bar. Credit: NASA, ESA, D. Jewitt (UCLA); Image Processing: J. DePasquale (STScI)
Image of interstellar comet 3I/ATLAS captured by the Hubble Space Telescope’s Wide Field Camera on 21 July 2025, with scale bar. Credit: NASA, ESA, D. Jewitt (UCLA); Image Processing: J. DePasquale (STScI)

Hubble's view of 3I/ATLAS

Data on 3I/ATLAS gathered by the Hubble Space Telescope suggests it must be as wide as 5.6 kilometres at most, and at least 320 metres.

But astronomers say that, although Hubble has helped refine these estimates, the heart of the comet still cannot be seen at the moment.

It's thought that observations by other observatories like the James Webb Space Telescope will help refine what we know about the comet, including its chemical makeup.

Diagram showing the trajectory of interstellar comet 3I/ATLAS, or C/2025 N1, as it passes through the Solar System. Credit: NASA/JPL-Caltech
Diagram showing the trajectory of interstellar comet 3I/ATLAS, or C/2025 N1, as it passes through the Solar System. Credit: NASA/JPL-Caltech

3I/ATLAS's dusty tail

Comets are frozen balls of dust and ice, and so when they get close to a star like our Sun, they heat up, and some of that frozen material turns into gas, streaming away from the comet.

Hubble has captured one such dust plume emerging from the side of the comet that's facing the Sun.

Data suggests 3I/ATLAS is losing dust at a rate consistent with comets that are detected around 480 million kilometres from the Sun.

Yet while the vast majority of comets that we know of originated on the outer edges of our Solar System, this interstellar visitor likely originated in some other Solar System, far beyond our Galaxy.

If you manage to capture an image of 3I/ATLAS, we'd love to see it! Send it to us via [email protected]

联系我们 contact @ memedata.com