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Hämarik

Koit b, XO-4 b, TOI-1721 b

Extrasolar planet in Lynx

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Proper NameHämarik
DesignationsKoit b, XO-4 b, TOI-1721 b
ClassificationGas giant (hot Jupiter)
Orbital Period4 days, 3 hours
Mean Distance from Koit8.3 million km
0.056 AU
Mass1.72 x Jupiter
Diameter1.34 x Jupiter
Temperature1,333 K (1,060°C)
Parent starKoit (XO-4), bright yellow dwarf in Lynx
Other planets in this systemNone

To the immediate northeast of Hämarik's primary star of Koit or XO-4 is the elongated shape of a distant spiral galaxy. This is PGC 2576681, less than an arcminute from Koit as seen from Earth (but actually immensely farther distant, at some 170 million light years beyond the Milky Way). Imagery provided by Aladin sky atlas

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