what does deep sky objects mean in the context of the constellation?
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what is hydrus? Small constellation in the deep southern sky. what are its characteristics? Irregular in shape and its tail has been shortened to make space for this last constellation he had drawn up. name a few stars in the constellation? Beta Hydri, Alpha Hydri, etc. where did the second star get its name from? Chinese system who decribed the constellation for the first time? Goes back to prehistory.
UNANSWERABLE A deep-sky object is any astronomical object that is not an individual star or Solar System object. The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects. Hydrus contains only faint deep-sky objects. UNANSWERABLE
Deep-sky object
Introduction
A deep-sky object (DSO) is any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.). The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies. This distinction is practical and technical, implying a variety of instruments and techniques appropriate to observation, and does not distinguish the nature of the object itself.
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Constellation [SEP] Introduction
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object. The origins of the earliest constellations likely go back to prehistory. People used them to relate stories of their beliefs, experiences, creation, or mythology. Different cultures and countries adopted their own constellations, some of which lasted into the early 20th century before today's constellations were internationally recognized. The recognition of constellations has changed significantly over time. Many have changed in size or shape. Some became popular, only to drop into obscurity.