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Exoplanetary Scratchpad

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Nearby Red Dwarf Kepler star Kepler-42 is also known as KOI-961. Has three transiting planets in torch orbits smaller than the Earth, including the smallest yet measured at the time of discovery. Planets are is c (~1.9 ME, 0.72 RE), b (~2.8 ME, 0.78 RE), and d (~0.95 ME, 0.57 RE, Earth-massed but Mars-sized). The planets have not been detected with dopplar spectrometry yet, so the masses and densities aren't known. Transits were detected independently and it is very unlikely the planets are not there. Nicknamed "Planets of the Apps" after a British amateur astronomer who alerted astronomers of the system's significance. The star was compared to Barnard's Star, in that they are both nearby and old. Comparison to this well known star assisted in the system's study. The system is comparable in scope to the Jovian system, more so than any other system. Outer Space Message Center lists this as one of the targets laser messages can get sent to.

Kepler-42 System Web Pages[]

Kepler-42 System In the News[]

3 Earth-sized Planets Found (Jan 2012)[]

Message Sent to System (2013)[]

See Also[]