K2-99

Planetary system · 1693.5 light-years away · also TYC 4974-871-1

K2-99 is 1,694 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this G0 IV star; the first was found in 2016 by transit (K2).

Fly there in 3D

Worth knowing

K2-99 b goes round its star every 18.2 days, 5 times as often as Mercury goes round the Sun.

The star

Spectral typeG0 IV
Surface temperature6,069 K
Mass1.44 solar masses
Radius2.55 solar radii
Luminosity7.93 times the Sun
Apparent magnitude11.149
Ageabout 3.7 billion years
Distance from the Sun1693.5 light-years (519.2 parsecs)
Position (J2000)RA 208.7738°, Dec -5.4425°
ConstellationVirgo

Planets (2)

PlanetYearOrbitRadiusMassFound
K2-99 b18.2 days0.153 AU11.882 R⊕276.51 M⊕Transit, 2016
K2-99 c522.2 days1.430 AU12.6 R⊕ estimated2669.8 M⊕ minimumRadial Velocity, 2022

Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.

Sources

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