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Constellations Star patterns of Science & Myth SNC1D Some definitions: • • • • Constellation: a pattern of stars Con = with, together; stellae = stars. Asterism: partial portion of a constellation Apparent Magnitude: how bright a star seems when viewed from Earth • Luminosity: amount of energy a star emits over time; W, L units. • i.e. Ls = 3.85 x 1026 W; Sirius is 23 Ls Apparent Magnitude: • When observing two stars from Earth, they may look equally bright, but actually have very different luminosities. Asterisms: • • • • Constellation: Ursa Major Asterism within it is the Big Dipper. Constellation: Ursa Minor Asterism within it is the Little Dipper. Circumpolar Constellations: • • • • • • Circumpolar: around the (north) pole Ursa Major Ursa Minor Draco Cassiopeia Cepheus Polaris & Pointer stars: • Polaris: the North Star • In line with North Pole & Earth’s axis • Part of Ursa Minor Positions change, not shape! The Ecliptic & the Zodiac:
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