About: HD 190228     Goto   Sponge   NotDistinct   Permalink

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HD 190228 is a star with a non-stellar companion in the constellation Vulpecula. Its apparent magnitude is 7.30 – too faint to be seen with the naked eye – and the absolute magnitude is 3.34. Based on parallax measurements, it is located at a distance of 205 light years from the Sun. The star is older than the Sun with an age over 5 billion years and it is metal-poor.

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rdfs:label
  • HD 190228 (de)
  • HD 190228 (en)
  • HD 190228 (pt)
  • HD 190228 (ru)
  • HD 190228 (sv)
  • HD 190228 (zh)
rdfs:comment
  • HD 190228 ist ein rund 200 Lichtjahre (ca. 62 Parsec) von der Sonne entfernter Stern mit einer scheinbaren visuellen Helligkeit von 7,3 mag im Sternbild Vulpecula. Der Stern ist ein Unterriese der Spektralklasse G und hat ein Alter von über 10 Milliarden Jahren. Er wird von einem substellaren Begleiter mit der Bezeichnung HD 190228 b (bzw. HD 190228 B) umrundet, bei dem es sich um einen Braunen Zwerg (oder eventuell auch einen massearmen Stern) handeln dürfte. (de)
  • HD 190228 är en dubbelstjärna belägen i den norra delen av stjärnbilden Räven. Den har en skenbar magnitud av ca 7,30 och kräver åtminstone en stark handkikare för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 15,9 mas, beräknas den befinna sig på ett avstånd på ca 205 ljusår (ca 63 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca –51 km/s. (sv)
  • HD 190228 é uma estrela na constelação de Vulpecula. Sua magnitude aparente é de de 7,31 e sua magnitude absoluta é de 3,34. É uma subgigante amarela, o que significa que ela ainda é da sequência principal mas seu hidrogênio está no fim. A estrela tem uma metalicidade baixa, o que significa que ela é velha e tem no mínimo 10 bilhões de anos. Em 2000, foi descoberto um planeta orbitando HD 190228. (pt)
  • HD 190228 (HIP 98714) — звезда в созвездии Лисички на расстоянии около 202 световых лет от нас. (ru)
  • HD 190228是一顆位於狐狸座的恆星,視星等7.31,絕對星等3.34,距離地球約204光年。該恆星的年齡被認為高於100億年,屬於貧金屬恆星。 2000年宣布在該恆星旁發現一顆質量下限是5倍木星質量的系外行星,編號 。該行星的狀況目前仍不明,因為母恆星金屬量並不高,而巨大行星較可能在金屬量高的恆星旁生成,因此有科學家認為它可能是棕矮星。之後的天文測量也確認 HD 190228 b 的質量高達木星的49.4倍,是位於接近面對地球軌道上的棕矮星。該棕矮星環繞母恆星軌道週期是1146日,軌道離心率0.5。 (zh)
  • HD 190228 is a star with a non-stellar companion in the constellation Vulpecula. Its apparent magnitude is 7.30 – too faint to be seen with the naked eye – and the absolute magnitude is 3.34. Based on parallax measurements, it is located at a distance of 205 light years from the Sun. The star is older than the Sun with an age over 5 billion years and it is metal-poor. (en)
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absmag v
age gyr
appmag v
ARICNS
class
  • G5IV (en)
component
  • HD 190228 (en)
  • HD 190228 b (en)
constell
eccentricity
EPE
  • HD+190228 (en)
epoch
  • J2000.0 (en)
gravity
inclination
mass
metal fe
  • –0.24 (en)
node
p error
parallax
period unitless
rotational velocity
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