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- NGC_663 abstract "NGC 663, also known as Caldwell 10, 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 as it lies at a distance of 300 parsecs.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 also has two red supergiant stars, both located on its peripheryNGC 663 is assumed to form part of the stellar association Cassiopeia OB8, that is located in the Perseus arm of the Milky Way, along with the open clusters M103, NGC 654, NGC 659, and some supergiant stars scattered between them, all of them having similar ages and distances.".
- NGC_663 thumbnail NGC663HunterWilson.jpg?width=300.
- NGC_663 wikiPageID "3089791".
- NGC_663 wikiPageRevisionID "601867049".
- NGC_663 appmagV "7.1".
- NGC_663 caption "NGC 663 in Cassiopeia".
- NGC_663 class "-".
- NGC_663 dec "+61° 15′".
- NGC_663 distLy "6850.0".
- NGC_663 distPc "2100".
- NGC_663 epoch Epoch_(astronomy).
- NGC_663 hasPhotoCollection NGC_663.
- NGC_663 name "NGC 663".
- NGC_663 names "Caldwell 10".
- NGC_663 ra "6360.0".
- NGC_663 sizeV "16".
- NGC_663 subject Category:Caldwell_objects.
- NGC_663 subject Category:Cassiopeia_(constellation).
- NGC_663 subject Category:NGC_objects.
- NGC_663 subject Category:Open_clusters.
- NGC_663 comment "NGC 663, also known as Caldwell 10, 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.".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 label "NGC 663".
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs NGC_663.
- NGC_663 sameAs m.08qqcn.
- NGC_663 sameAs Q825894.
- NGC_663 sameAs Q825894.
- NGC_663 wasDerivedFrom NGC_663?oldid=601867049.
- NGC_663 depiction NGC663HunterWilson.jpg.
- NGC_663 isPrimaryTopicOf NGC_663.