Kepler-70
star in the constellation Cygnus
Kepler-70, also known as KIC 5807616 and KOI-55, is a star about 3,600 light-years (1,100 parsecs) away in the constellation Cygnus, with an apparent visual magnitude of 14.87. This is too faint to be seen with the naked eye; viewing it requires a telescope with an aperture of 40 cm (20 in) or more.
A subdwarf B star, Kepler-70 passed through the red giant stage some 18.4 million years ago. In its present-day state, it is fusing helium in its core. Once it runs out of helium it will contract to form a white dwarf. It has a relatively small radius of about 0.2 times the Sun's radius; white dwarfs are generally much smaller. The star was thought to be host to a planetary system with two planets, although later research indicates that this is not in fact the case.
Properties
Kepler-70 is an sdB (B-type subdwarf) star with a temperature of about 28,000 K, equivalent to that of a B0-type star, and nearly 6 times as hot as the surface temperature of the Sun, which has a surface temperature of 5,772 K. It has a luminosity of 22.9 L☉, a radius of 0.203 R☉, and a mass of 0.496 M☉. The star left the red-giant stage of its lifetime about 18.4 million years ago.
Kepler-70 is still fusing helium in its core.
Begin with the source’s own compact description: “Kepler-70” is star in the constellation Cygnus. The dossier treats that line as a proposition to test through Kepler-70, star and constellation, not as a finished interpretation.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Aug 23, 2026. The linked authority identifier is Q1635314. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Kepler-70” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.