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- BD+20°2457 abstract "BD+20°2457 is a 10th magnitude K-type bright giant star located between 320 to 980 light years away in the constellation of Leo. This star is very metal-poor, containing only 10% as enriched with elements heavier than hydrogen and helium as our sun, almost classifying this as a population II star. On June 10, 2009, two planets were announced to be orbiting the star, with minimum masses 21.4 and 12.5 times the mass of Jupiter and orbital periods of 380 and 622 days for the inner and outer planets respectively. A dynamical analysis reveals that the proposed system is unstable on astronomically-short timescales and so the suggested planetary configuration is unlikely to be correct: further data is needed to determine a physically-plausible explanation for the radial velocity variations.".
- BD+20°2457 thumbnail Star_BD+20_2457.png?width=300.
- BD+20°2457 wikiPageID "23629946".
- BD+20°2457 wikiPageRevisionID "602462380".
- BD+20°2457 appmagV "9.75".
- BD+20°2457 bV "1.18".
- BD+20°2457 class "K2II".
- BD+20°2457 constell Leo_(constellation).
- BD+20°2457 distLy "650".
- BD+20°2457 distPc "200".
- BD+20°2457 epe "BD20+2457".
- BD+20°2457 epoch "J2000.0".
- BD+20°2457 gravity "2.5".
- BD+20°2457 luminosity "624".
- BD+20°2457 mass "2.8".
- BD+20°2457 metal "–1.00 ± 0.07".
- BD+20°2457 nsted "BD%2B20+2457".
- BD+20°2457 pError "3.33".
- BD+20°2457 parallax "5".
- BD+20°2457 propMoDec "–31.70".
- BD+20°2457 propMoRa "–35.20".
- BD+20°2457 radius "49".
- BD+20°2457 simbad "BD%2B20+2457".
- BD+20°2457 temperature "4127".
- BD+20°2457 variable "none".
- BD+20°2457 subject Category:Durchmusterung_objects.
- BD+20°2457 subject Category:Hypothetical_planetary_systems.
- BD+20°2457 subject Category:K-type_bright_giants.
- BD+20°2457 subject Category:Leo_(constellation).
- BD+20°2457 type CelestialBody.
- BD+20°2457 type Star.
- BD+20°2457 type PhysicalBody.
- BD+20°2457 comment "BD+20°2457 is a 10th magnitude K-type bright giant star located between 320 to 980 light years away in the constellation of Leo. This star is very metal-poor, containing only 10% as enriched with elements heavier than hydrogen and helium as our sun, almost classifying this as a population II star.".
- BD+20°2457 label "BD+20°2457".
- BD+20°2457 label "BD+20°2457".
- BD+20°2457 label "BD+20°2457".
- BD+20°2457 label "BD+20°2457".
- BD+20°2457 label "BD+20°2457".
- BD+20°2457 sameAs BD+20%C2%B02457.
- BD+20°2457 sameAs BD+20°2457.
- BD+20°2457 sameAs BD+20°2457.
- BD+20°2457 sameAs Q1753582.
- BD+20°2457 sameAs Q1753582.
- BD+20°2457 wasDerivedFrom BD+20°2457?oldid=602462380.
- BD+20°2457 depiction Star_BD+20_2457.png.