Caption: 2022年国际天文学联合会（IAU）OAE天文摄影比赛静态天体图案类别荣誉奖作品。 这张照片于2016年3 月在印度尼西亚爪哇岛的婆罗摩腾格塞梅鲁国家公园拍摄，展现了银河形成的拱桥和许多突出的星座，包括了夜空中最显著的亮星。 在照片左下角，我们可以看到南门二和马腹一，前者较低，后者较高，都位于的巨大的半人马座中。可由它们的指引找到南十字座，南十字座的长轴指向南天极，而南天极大致位于地平线上，这是因为爪哇岛几乎位于赤道上。南十字座几乎完全被云层遮挡，照片中只能看到四颗明亮的星星。而南船座中的恒星组成的赝十字星群，在稍远处的银河上方也明显可见，容易使人混淆。 真正的南十字座和赝十字星群之间的粉红色斑点是船底座星云，距离地球约8500光年，位于船底座，肉眼看不到。在船底座，我们还可以看到夜空中第二亮的恒星——老人星，它就在银河和地面道路之间。 更亮的是天狼星，夜空中最亮的恒星。天狼星位于大犬座，大犬座是猎户座的两只猎犬之一。猎户座在照片的右半部分，地平线附近云层的上方。猎户座的腰带上有三颗明亮的恒星，其连线左上指向天狼星，右下指向堪堪露出地平线的毕宿五。 猎户座包含了天空中最亮的几颗恒星，是色彩最丰富的星座，因为它拥有参宿七——银河下方靠右的一颗蓝色亮星，以及参宿四——参宿七右上方较高位置的一颗红色亮星。在它们之间，三颗恒星组成了著名的星群——猎户座腰带。猎户座大星云就在猎户座腰带旁边，这是一个恒星形成区，其明亮的中心即便用肉眼看也清晰可见，在这张照片中也是如此清晰。 在参宿四的上方，银河的另一侧，可以看到明亮的南河三，其英文名称Procyon的字面意思是”在狗之前“。在希腊神话中，它被看作由单颗恒星组成的星群，是与猎户座相伴的小猎犬，后来演变成了现代的小犬座。 在照片右上角，巨蟹座的蜂巢星团很容易辨认。在其下方，可以看到双子座的北河二和北河三，它们在这张照片中并不显眼。与之形成鲜明对比的是，御夫座的明亮白色恒星五车二，在照片右边缘中部的云层中闪闪发光。 在地面道路周围可以看到一些光污染。
Credit: Giorgia Hofer/IAU OAE

Caption: The zodiac constellation Cancer and its surrounding constellations. Starting from the top of the diagram and going clockwise, these are Lynx, Gemini, Canis Minor, Hydra, Leo and Leo Minor. The ecliptic (shown here as a blue line) passes almost exactly through the middle of the constellation, this is the path the Sun appears to take across the sky over the course of a year. The Sun is in Cancer from late July to mid August. The other planets of the Solar System can often be found in Cancer. Cancer lies just north of the celestial equator and is thus visible at some time in the year from all of planet Earth except for the most antarctic regions of the world. Cancer is most visible in the evenings in the northern hemisphere spring and southern hemisphere autumn. Two star clusters are visible in Cancer: M44, an open cluster often called the Beehive Cluster, and M46, a denser open cluster with about four times more stars than M44. These clusters are indicated by yellow circles with a dotted border on the map. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labelled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries nor the lines joining the stars appear on the sky.
Credit: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

Caption: The zodiac constellation Leo and its surrounding constellations. Starting from the top of the diagram and going clockwise, these are Leo Minor, Cancer, Sextans, Hydra, Crater, Virgo and Ursa Major. The brightest star in Leo, Regulus, lies almost exactly on the ecliptic (shown here as a blue line): the path the Sun appears to take across the sky over the course of a year. The Sun spends the period from mid August to mid September in Leo. The other planets in the Solar System can often be found in Leo. Leo spans the celestial equator and is thus part of it is visible at some time in the year from all of planet Earth with some of the constellation obscured for the most arctic and antarctic regions of the world. Leo is most visible in the evenings in the northern hemisphere spring and southern hemisphere autumn. Several objects can be seen in Leo, including M65 and M66 – two galaxies in the Leo Triplet, a trio of galaxies including NGC 3628, not listed here. In addition, M96, a spiral galaxy, can be seen as a fuzzy object using a small telescope, and Messier 105, an elliptical galaxy. Each of these objects are labelled on the map as red ellipses. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labelled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries nor the lines joining the stars appear on the sky.
Credit: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

Caption: The constellation Hydra with its bright stars and surrounding constellations. Hydra is surrounded by (going clockwise from the top): Leo, Cancer, Canis Minor, Monoceros, Puppis, Pyxis, Antlia, Centaurus, Lupus, Libra, Virgo, Corvus, Crater and Sextans. Hydra is a large constellation that covers over a quarter of the celestial sphere in right ascension. It also spans the celestial equator and thus part of the constellation is visible from everywhere on the Earth at some point in the year. All parts of the constellation are visible at some point for all but the most antarctic parts of the southern hemisphere and to equatorial and most temperate regions of the northern hemisphere. However the wide span of the constellation means that all of it may not be visible at the same time in many of these regions. Hydra is best viewed in the northern hemisphere spring and southern hemisphere autumn. The famous spiral galaxy M83, also known as the Pinwheel Galaxy, lies in Hydra. It is marked here with a red ellipse. The planetary nebula NGC 3242 can also be found in Hydra. It is marked here with a green circle with a plus sign superimposed on it. The open cluster M48 is marked here with a yellow circle while the globular cluster M68 is marked with a yellow circle with a plus sign superimposed on it. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the lines joining the stars appear on the sky. The blue line on the diagram marks the ecliptic.
Credit: Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope