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时隔一年多后,这颗矮行星又要冲日了
Xin Hua She· 2025-10-06 08:55
谷神星今年冲日是在10月8日,位于鲸鱼座,最大亮度7.6等。"冲日前后几天,太阳落下以后,谷神星 就会从东方地平线上升起,直到第二天太阳升起后,它才从西边落下,因此整夜均可观测。"赖迪辉 说。 中国天文学会会员、天津市天文学会理事赖迪辉介绍,绝大多数小行星位于火星和木星轨道之间的小行 星带内。本次冲日的主角谷神星是人类发现的第一颗小行星。随着矮行星定义的公布,谷神星被归类为 矮行星,于是它就成为现在太阳系中最小的、也是唯一位于小行星带中的矮行星。 这张由美国国家航空航天局2014年1月22日提供的概念图显示的是谷神星位于火星和木星轨道间的小行 星带中。新华社/路透 谷神星的公转周期4.6年,会合周期467天,也就是大约1年又3个多月冲日一次。谷神星冲日是指谷神 星、地球与太阳呈近似一条直线,地球位于两者之间。此时,谷神星被太阳照亮的一面会完全朝向地 球,其亮度会达到最高值。 太阳系中最小的矮行星——谷神星将于10月8日冲日,迎来观测良机。天文科普专家表示,冲日前后几 天,感兴趣的公众借助小型天文望远镜或双筒望远镜,有望在秋季夜空中找到谷神星的身影。 这是2015年3月1日从"黎明"号小行星探测器上拍摄的谷神星 ...
星空有约|起底太阳系第三位“闯入者”的“身世”
Xin Hua She· 2025-07-07 03:13
Core Viewpoint - The discovery of the interstellar object 3I/ATLAS, the third known visitor to the solar system, has garnered significant attention from astronomers and enthusiasts worldwide [1][4]. Group 1: Characteristics of 3I/ATLAS - 3I/ATLAS is classified as an interstellar object due to its high eccentricity hyperbolic trajectory, with an eccentricity of 6.23, differing from the elliptical or near-parabolic orbits of typical solar system bodies [3]. - The object is believed to have a cold nucleus and exhibits cometary activity, suggesting it is more likely a comet than an asteroid [3]. - At the time of discovery, 3I/ATLAS was approximately 670 million kilometers from the Sun and had a brightness of about magnitude 18, making it difficult to observe with standard telescopes [4]. Group 2: Observational Opportunities and Future Trajectory - Ground-based telescopes are expected to observe 3I/ATLAS until September, after which it will be too close to the Sun for observation [5]. - The object is predicted to reach its perihelion around October 29, entering the orbit of Mars, and will maintain a distance of at least 240 million kilometers from Earth [4]. - Following its perihelion, 3I/ATLAS is expected to gradually move away from the solar system and return to interstellar space over the coming years [5]. Group 3: Historical Context of Interstellar Visitors - Prior to 3I/ATLAS, the first known interstellar visitor was 'Oumuamua, discovered in October 2017, which was initially thought to be an asteroid but later classified as a comet [5]. - The second interstellar visitor, 2I/Borisov, was discovered in 2019 and is also classified as a comet [5]. - The rarity of interstellar objects entering the solar system highlights the unique nature of such discoveries and the ongoing research into their origins [5].