Q2299623

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Wikidata facts

Instance of: eruptive variable star
Constellation: Cygnus
Child body: Kepler-42 b
Distance from Earth: 38.7
Diameter: 263000
Radius: 0.17
Mass: 0.13
Variable-star type: rotating variable star
Image: Artist's conception of Kepler-42.jpg

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Commons category: Kepler-42
catalog code: TIC 63126862
parallax: 24.9338
surface gravity: 36500
apparent magnitude: 14.969373
effective temperature: 3068
spectral class: M3V
epoch: J2000.0
right ascension component of proper motion: 0.086
metallicity: -0.5
declination component of proper motion: -0.414
right ascension: 292.2190369753379
declination: 44.61916383879584
age estimated by a dating method: 4.5

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Encyclopedic overview

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Contents

Characteristics
Planetary system
Notes
References

Kepler-42, formerly known as KOI-961, is a red dwarf located in the constellation Cygnus and approximately 131 light years from the Sun. It has three known extrasolar planets, all of which are smaller than Earth in radius and orbit very close to the star.

==Characteristics== Kepler-42's mass is estimated to be 0.13 times that of the Sun, and a radius 0.17 times that of the Sun, just 1.7 times that of the gas giant Jupiter. Due to its small radius and hence surface area, the luminosity of Kepler-42 is only 0.24% of that of the Sun. Its metallicity is one third of the Sun's. Kepler-42 has an appreciable proper motion of up to 431±8 mas/yr. Due to its small size and low temperature, the star's habitable zone is much closer to the star than Earth is to the Sun.

Excerpted from Wikipedia’s “Q2299623” article, available under the CC BY-SA 4.0 licence.