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Tevel b, HAT-P-9 b

Proper NameAlef
DesignationsTevel b, HAT-P-9 b
ClassificationGas Giant (Hot Jupiter)
Orbital Period3 days, 22 hours
Mean Distance from Tevel7.9 million km
0.053 AU
Mass0.75 x Jupiter
Diameter1.39 x Jupiter
Temperature1,540 K (1,267°C)
Parent starTevel (HAT-P-9), probable bright yellow dwarf in Auriga
Other planets in this systemNone
NotesAlef is a gas giant somewhat larger than Jupiter, but also rather less dense (it is nearly 40% larger than Jupiter, but has only some 75% of that planet's mass). It follows a very close orbit around the star Tevel (HAT-P-9), so close indeed that completes a circuit of the star in less than four day. This proximity to its primary star makes Alef one of the class of gas giants known as 'hot Jupiters'.

Imagery provided by Aladin sky atlas


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