NGC 1514

This 10m0 bright PN aka the 'crystal-ball-nebula' located in the constellation of Taurus measures some 1.9 arc minutes in a circular shape, which is rather large for a PN. The central star is very bright at 9m5, therefore it can easily be seen in a standard amateur telescope. William Herschel described this object in 1790 forcing him to reconsider and reformulate his own theory which assumed the nebulosity around some particular stars might origin in minute stars, too tiny to be resolved. (Remeber, the telescopes of that era were significantly inferior to modern scopes in terms of resolution power and intensity). Most recent investigations reveal the central star to be a very close binary system with a rotation periode of 9hours and 50minutes. Following Vorontsov-Velyaminov classification of PNs NGC 1514 is part of the category multiple type 3+2; that indicates the existence of two expanding gas-shells. This very gas near its center is expanding outward at about 25 km/sec, while the whole objects moves away from earth at 60 km/sec. Since the object is located some 2000 light years away, the effect of both dynamical phenomena will hardly be detectable within a life span of a human. (source courtesy part: Ice In Space).
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