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- G_117-B15A abstract "G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor.G117-B15A was found to be variable in 1974 by Richer and Ulrych, and this was confirmed in 1976 by McGraw and Robinson. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations. As a consequence, its timescale for period change is directly proportional to its cooling timescale, allowing its cooling rate to be measured using astroseismological techniques. Its age is estimated at 400 million years. Its light curve has a dominant period of 215.2 seconds, which is estimated to increase by approximately one second each 14 million years. G117-B15A has been claimed to be the most stable optical clock ever found, much more stable than the ticks of an atomic clock. It is also the first pulsating white dwarf to have its main pulsation mode index identified.".
- G_117-B15A wikiPageExternalLink sim-id?Ident=G117-B15A.
- G_117-B15A wikiPageID "11633574".
- G_117-B15A wikiPageLength "4549".
- G_117-B15A wikiPageOutDegree "22".
- G_117-B15A wikiPageRevisionID "660982601".
- G_117-B15A wikiPageWikiLink Asteroseismology.
- G_117-B15A wikiPageWikiLink Atomic_clock.
- G_117-B15A wikiPageWikiLink Category:Astronomical_X-ray_sources.
- G_117-B15A wikiPageWikiLink Category:Leo_Minor.
- G_117-B15A wikiPageWikiLink Category:Objects_named_with_variable_star_designations.
- G_117-B15A wikiPageWikiLink Category:Pulsating_white_dwarfs.
- G_117-B15A wikiPageWikiLink Category:X-ray_astronomy.
- G_117-B15A wikiPageWikiLink Constellation.
- G_117-B15A wikiPageWikiLink DAV_star.
- G_117-B15A wikiPageWikiLink Epoch_(astronomy).
- G_117-B15A wikiPageWikiLink Gravity_wave.
- G_117-B15A wikiPageWikiLink International_Celestial_Reference_System.
- G_117-B15A wikiPageWikiLink J2000.0.
- G_117-B15A wikiPageWikiLink Leo_Minor.
- G_117-B15A wikiPageWikiLink Leo_Minor_(constellation).
- G_117-B15A wikiPageWikiLink Light_curve.
- G_117-B15A wikiPageWikiLink Pulsating_white_dwarf.
- G_117-B15A wikiPageWikiLink Ross_548.
- G_117-B15A wikiPageWikiLink Star.
- G_117-B15A wikiPageWikiLink Variable_star.
- G_117-B15A wikiPageWikiLink White_dwarf.
- G_117-B15A wikiPageWikiLinkText "G 117-B15A".
- G_117-B15A appmagV "15.5".
- G_117-B15A bV "0.2".
- G_117-B15A class "DAV4".
- G_117-B15A constell Leo_Minor.
- G_117-B15A constell Leo_Minor_(constellation).
- G_117-B15A epoch "J2000.0".
- G_117-B15A hasPhotoCollection G_117-B15A.
- G_117-B15A propMoDec "22".
- G_117-B15A propMoRa "-136".
- G_117-B15A uB "-0.6".
- G_117-B15A variable DAV_star.
- G_117-B15A variable Pulsating_white_dwarf.
- G_117-B15A wikiPageUsesTemplate Template:Reflist.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_astrometry.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_begin.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_catalog.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_character.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_end.
- G_117-B15A wikiPageUsesTemplate Template:Starbox_observe.
- G_117-B15A wikiPageUsesTemplate Template:Stars_of_Leo_Minor.
- G_117-B15A subject Category:Astronomical_X-ray_sources.
- G_117-B15A subject Category:Leo_Minor.
- G_117-B15A subject Category:Objects_named_with_variable_star_designations.
- G_117-B15A subject Category:Pulsating_white_dwarfs.
- G_117-B15A subject Category:X-ray_astronomy.
- G_117-B15A hypernym Star.
- G_117-B15A type CelestialBody.
- G_117-B15A type Place.
- G_117-B15A type Star.
- G_117-B15A type Location.
- G_117-B15A type Place.
- G_117-B15A type Thing.
- G_117-B15A comment "G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor.G117-B15A was found to be variable in 1974 by Richer and Ulrych, and this was confirmed in 1976 by McGraw and Robinson. In 1984 it was demonstrated that the star's variability is due to nonradial gravity wave pulsations.".
- G_117-B15A label "G 117-B15A".
- G_117-B15A sameAs RY_Leonis_Minoris.
- G_117-B15A sameAs RY_Leonis_Minoris.
- G_117-B15A sameAs جی۱۱۷-بی۱۵ای.
- G_117-B15A sameAs m.02rm744.
- G_117-B15A sameAs Q5175841.
- G_117-B15A sameAs Q5175841.
- G_117-B15A wasDerivedFrom G_117-B15A?oldid=660982601.
- G_117-B15A isPrimaryTopicOf G_117-B15A.
- G_117-B15A name "G117-B15A".