NGC 663 is young open cluster of about 400 stars in the Cassiopeia constellation. It has an estimated 400 stars and spans about a quarter of a degree across the sky. It can reportedly be detected with the unaided eye, although a telescope is recommended for best viewing. The brightest members of the cluster can be viewed with binoculars. Although the listed visual magnitude is 7.1, several observers have reported higher estimates.

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  • NGC 663 is young open cluster of about 400 stars in the Cassiopeia constellation. It has an estimated 400 stars and spans about a quarter of a degree across the sky. It can reportedly be detected with the unaided eye, although a telescope is recommended for best viewing. The brightest members of the cluster can be viewed with binoculars. Although the listed visual magnitude is 7.1, several observers have reported higher estimates. After adjusting for reddening due to interstellar dust, the distance modulus is estimated as 11.6 magnitudes. It is located about 2,100 parsecs distant with an estimated age of 20–25 million years. This means that stars of spectral class B2 or higher (in the sense of higher mass), are reaching the end of their main sequence lifespan. This cluster appears to be located in front of a molecular cloud, although the two are not physically associated. This cloud has the effect of blocking background stars from the visual image of the cluster. This cluster is of interest because of the high number of Be stars, with a total of about 24 discovered. These are spectral class B stars that show prominent emission lines of hydrogen in their spectrum. Most of the Be stars in the cluster lie between spectral class B0 and B3. A candidate member of the cluster, LS I +61° 235, is a Be star with an X-ray binary component that has a period of about three years. There are at least five blue stragglers in the cluster. These are stars that formed by the merger of two other stars. Two of the cluster's star systems are likely eclipsing binaries with periods of 0.6 and 1.03 days.
  • NGC 663 ist ein offener Sternhaufen im Sternbild Kassiopeia. NGC 663 hat einen Durchmesser von 16' und eine scheinbare Helligkeit von +7,1 mag. NGC 663 ist ein relativ junger Sternhaufen und enthält zahlreiche Be-Sterne. NGC 663 ist Teil der OB-Assoziation Cassiopeia OB8, zu der unter anderem auch NGC 654 und Messier 103 gehören. NGC 663 wird als massereichster Sternhaufen und Kern von Cassiopeia OB8 angesehen. Der Doppelstern Struve 152 ist ein Mitglied des Sternhaufens. NGC 663 wurde 1787 von Friedrich Wilhelm Herschel entdeckt. Siehe auch: NGC-Katalog
  • Az NGC 663 (más néven Caldwell 10) egy nyílthalmaz a Cassiopeia csillagképben.
  • NGC 663 è un piccolo ammasso aperto nella costellazione di Cassiopea; si tratta di uno dei tanti ammassi aperti individuabili in questo tratto di Via Lattea boreale. Quest'ammasso fu scoperto sul finire del XVIII secolo da William Herschel; la sua distanza non è del tutto chiara.
  • NGC 663 (również OCL 333) – gromada otwarta, znajdująca się w gwiazdozbiorze Kasjopei. Odkrył ją William Herschel.
  • NGC 663 (другое обозначение — OCL 333) — рассеянное скопление в созвездии Кассиопея. В скопление входит 80 звёзд. Этот объект входит в число перечисленных в оригинальной редакции нового общего каталога.
  • NGC 663 är en öppen stjärnhop som ligger 1/2 grad söder om NGC 654 i stjärnbilden Cassiopeja. NGC 663 har en magnitud på +7,0. I ett 150 mm teleskop ser denna hop med ungefär 80 stjärnor nästan rund ut, lite grand som en korsning mellan en öppen och en klotformig hop.
  • NGC 663, Kraliçe takımyıldızı yönünde bulunan bir açık yıldız kümesi. William Herschel tarafından 1787 yılında keşfedilmiştir.
  • NGC 663 是仙后座的一個星系。
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  • 7.1 (xsd:double)
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  • -
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  • +61° 15′
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  • 6850 (xsd:integer)
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  • Caldwell 10
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  • 01h 46.0m
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  • 16.0″
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  • NGC 663 is young open cluster of about 400 stars in the Cassiopeia constellation. It has an estimated 400 stars and spans about a quarter of a degree across the sky. It can reportedly be detected with the unaided eye, although a telescope is recommended for best viewing. The brightest members of the cluster can be viewed with binoculars. Although the listed visual magnitude is 7.1, several observers have reported higher estimates.
  • NGC 663 ist ein offener Sternhaufen im Sternbild Kassiopeia. NGC 663 hat einen Durchmesser von 16' und eine scheinbare Helligkeit von +7,1 mag. NGC 663 ist ein relativ junger Sternhaufen und enthält zahlreiche Be-Sterne. NGC 663 ist Teil der OB-Assoziation Cassiopeia OB8, zu der unter anderem auch NGC 654 und Messier 103 gehören. NGC 663 wird als massereichster Sternhaufen und Kern von Cassiopeia OB8 angesehen. Der Doppelstern Struve 152 ist ein Mitglied des Sternhaufens.
  • Az NGC 663 (más néven Caldwell 10) egy nyílthalmaz a Cassiopeia csillagképben.
  • NGC 663 è un piccolo ammasso aperto nella costellazione di Cassiopea; si tratta di uno dei tanti ammassi aperti individuabili in questo tratto di Via Lattea boreale. Quest'ammasso fu scoperto sul finire del XVIII secolo da William Herschel; la sua distanza non è del tutto chiara.
  • NGC 663 (również OCL 333) – gromada otwarta, znajdująca się w gwiazdozbiorze Kasjopei. Odkrył ją William Herschel.
  • NGC 663 (другое обозначение — OCL 333) — рассеянное скопление в созвездии Кассиопея. В скопление входит 80 звёзд. Этот объект входит в число перечисленных в оригинальной редакции нового общего каталога.
  • NGC 663 är en öppen stjärnhop som ligger 1/2 grad söder om NGC 654 i stjärnbilden Cassiopeja. NGC 663 har en magnitud på +7,0. I ett 150 mm teleskop ser denna hop med ungefär 80 stjärnor nästan rund ut, lite grand som en korsning mellan en öppen och en klotformig hop.
  • NGC 663, Kraliçe takımyıldızı yönünde bulunan bir açık yıldız kümesi. William Herschel tarafından 1787 yılında keşfedilmiştir.
  • NGC 663 是仙后座的一個星系。
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  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
  • NGC 663
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