Balloon Flask Workshop: modelling the celestial sphere

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图注： Participants look on a demonstration of how to model the celestial sphere
来源： Organisers of the 4th Chilean Astronomy Education Conference

文件 ( 图像 969.73 kB)

扬帆天海

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为 OAE 制作

图注： 在这张于2022年4月用智能手机拍摄的黑白照片，一叶孤舟停靠在澳大利亚尤坎本湖畔，被银河系的璀璨星空所衬托。银心的耀眼光芒在夜空中格外醒目，其星云与恒星交织的复杂图案形成了鲜明的对比。每一颗闪耀的光点都是一颗遥远的恒星，或许周围还环绕着未被探索的行星，突显了我们广袤而复杂的银河家园的浩瀚。
来源： 胡韵希/国际天文学联合会教育办公室 (CC BY 4.0)

词汇表: 银河系 , 导航
分类： 肉眼天文学
标签： astrophotography

授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标

此文件在 Zenodo 上 ( 图像 7.11 MB)

The Hale Telescope

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图注： This image shows the Hale Telescope at the Palomar Observatory in northern San Diego County, California, USA and operated by the California Institute of Technology (Caltech). With its 5.1 m primary mirror, the Hale Telescope was the largest effective optical telescope in the world from its first light in 1949 until 1993. Here we see the Hale Telescope when not in operation. The telescope itself is the large, vertical, approximately cylindrical object in the centre of the image. Telescopes like this use mirrors to gather faint light and form clear images of distant targets, enabling scientists to study everything from nearby stars and planets to remote galaxies. The primary mirror, seen here at the bottom of the telescope, focusses light from the sky to the prime focus at the top of the telescope. Instruments such as cameras and spectrographs can be placed at this prime focus or alternatively a secondary mirror can reflect light back down the telescope and through a hole in the primary mirror to instruments. The telescope is supported by a large mount, seen here at an angle to the telescope. This particular mount is a type of equatorial mount. This means that one of the rotation axes of the mount points to the celestial poles. When a star or galaxy moves across the sky due to the Earth's rotation, the telescope only has rotate on this axis to keep pointing at that star or galaxy. Most modern large telescopes use a different kind of mount and rely on computer calculations to accurately track an object across the sky. The Hale Telescope is housed under a large rotating dome that opens at night so the telescope can track objects across the sky.
来源： JPL/Caltech/Palomar Observatory
来源链接

词汇表: 反射式望远镜 , 望远镜
分类： 观测天文学 , 望远镜、仪器与天文台

授权许可： 公共领域 公共领域 图标

文件 ( 图像 12.65 MB)

Gemini South's primary mirror and telescope structure

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图注： This is the primary mirror and supporting structure of a large optical telescope at the Gemini South Observatory in Chile. The primary mirror is the largest and most important mirror in a reflecting telescope: its gently curved surface gathers light from faint stars, galaxies, and nebulae and reflects that light to a focal point. At this focal point light is either fed directly in to an instrument to record spectra and images or redirected to such an instrument by a series of further mirrors. The sturdy metal framework around the primary mirros keeps the mirror precisely aligned and protected while the telescope moves to track objects across the sky. In telescopes that use mirrors instead of lenses, such as this one, the mirror is what collects and focuses the light from distant celestial objects. Larger mirrors can capture more light, allowing astronomers to see fainter and more distant objects. A larger primary mirror can also take sharper images of the sky, but this is often negated by the blurring effect of the Earth's atmopshere. A primary mirror must be perfectly smooth to tolerances of fractions of a wavelength of light so that it produces sharp, clear images. We can think of the primary mirror as the “eye” of the telescope that looks out into space, with its shape and support enabling powerful astronomical observations.
来源： International Gemini Observatory/NOIRLab/NSF/AURA/M. Paredes
来源链接

词汇表: 反射式望远镜 , 反射镜
分类： 观测天文学 , 望远镜、仪器与天文台

授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标

文件 ( 图像 23.24 MB)

星轨

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为 OAE 制作

图注： 这张拍摄于2022年10月的照片是在印度阿马尔提亚村（Amartiya）帕诺提耶（Panotiya）的黑夜中拍摄的，展现了夜空中美丽的星轨。摄影师仅用一部智能手机和一个三脚架就捕捉到了这些星轨——它们是我们星球自转的视觉证据，因为每一条星轨都代表着地球自转时恒星的明显运动，创造出令人着迷的宇宙光影编舞。恒星有不同的颜色，有的闪着蓝光，有的泛白，暗示着它们不同的温度和组成。此外，一架飞机的细微轨迹与永恒的星空之舞短暂的交汇在一起，宁静的星空与下方熙熙攘攘的生命活动形成了鲜明对比。
来源： Govind Gurjar/IAU OAE (CC BY 4.0)

词汇表: 天球 , 地球自转
分类： 肉眼天文学
标签： astrophotography

授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标

此文件在 Zenodo 上 ( 图像 1.98 MB)