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Aniara b, HD 102956 b

Proper NameIsagel
DesignationsAniara b, HD 102956 b
ClassificationGas Giant (Hot Jupiter)
Orbital Period6 days, 12 hours
Mean Distance from Aniara12.1 million km
0.081 AU
Mass0.96 x Jupiter
DiameterNot known
Temperaturec. 1,500 K (c. 1,200°C)
Parent starAniara (HD 102956), probable yellow subgiant in Ursa Major
Other planets in this systemNone

HD 102956 (also known as Aniara) is a yellow star, about four times as massive as the Sun and approximately four hundred light years from the Solar System. The star is in Ursa Major, falling within the quadrangle of stars that make up the 'share' of the Plough (or the 'bowl' of the Big Dipper) though its visual magnitude of just +7.86 means that it is far too faint to be visible to the naked eye

Imagery provided by Aladin sky atlas

Orbiting this star is the gas giant planet Isagel, designated HD 102956 b, the only known planet in this system. This giant planet is similar in many ways to Jupiter - its mass is almost identical - but where Jupiter follows a path far from the Sun, Isagel whirls around its parent star in a very close orbit, at a distance about a tenth of that from the Sun to the Earth, which it completes in a period if less than seven days. This tight orbit means that the surface temperatures on the planet are immense, reaching in excess of 1,500 K and placing Isagel in the class of planets known as 'hot Jupiters'


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