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Encyclopedia > 15 Aquilae

15 Aquilae is a double star in the constellation Aquila. Its apparent magnitude is 5.40. It's composed of a magnitude 5 yellow star and a magnitude 7 star, already resolvable by a small telescope. When two stars are so nearly in the same direction as seen from Earth that they appear to be a single star to the naked eye but may be separated by the use of telescopes, they are referred to as a double star. ... Orion is a remarkable constellation, visible from most places on the globe at one time or another during the year. ... Aquila (Latin for Eagle), is one of the 48 constellations listed by Ptolemy and is now also part of the list of 88 constellations acknowledged by the IAU. It lies roughly at the celestial equator. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ...


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Aquila (327 words)
Two major novae have been observed in Aquila; the first one was in 389 BC and was recorded to be as bright as Venus, the other shone brighter than Altair.
The variable star η Aquilae is one of the brightest Cepheids; its brightness varies from 4.1 mag to 5.3 mag every 7.2 days.
The double star 15 Aquilae is a yellow K star of 5.4 mag accompanied by a 7th mag star; it can easily be observed with small telescopes.
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