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  2. New General Catalogue - Wikipedia

    en.wikipedia.org/wiki/New_General_Catalogue

    The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae.

  3. NGC 869 - Wikipedia

    en.wikipedia.org/wiki/NGC_869

    NGC 869 (also known as h Persei) is an open cluster located 7460 light years away in the constellation of Perseus. [2] The cluster is about 14 million years old. [2] It is the westernmost of the Double Cluster with NGC 884.

  4. NGC 7789 - Wikipedia

    en.wikipedia.org/wiki/NGC_7789

    NGC 7789 (also known as Caroline's Rose, [4] Caroline's Haystack, [5] or the White Rose Cluster) is an open cluster in Cassiopeia that was discovered by Caroline Herschel in 1783. Her brother William Herschel included it in his catalog as H VI.30.

  5. NGC 3532 - Wikipedia

    en.wikipedia.org/wiki/NGC_3532

    The cluster lies between the constellation Crux and the larger but fainter "False Cross" asterism. The 4th-magnitude Cepheid variable star x Carinae appears near the southeast fringes, but it lies between the Sun and the cluster and is not a member of the cluster. The cluster was first catalogued by Nicolas Louis de Lacaille in 1752. [18]

  6. NGC 457 - Wikipedia

    en.wikipedia.org/wiki/NGC_457

    See also: Open cluster, List of open clusters NGC 457 (also designated Caldwell 13 , and known as the Dragonfly Cluster , E.T. Cluster , Owl Cluster , Kachina Doll Cluster or Phi Cassiopeiae Cluster ) [ 2 ] is an open star cluster in the constellation Cassiopeia .

  7. Hertzsprung–Russell diagram - Wikipedia

    en.wikipedia.org/wiki/Hertzsprung–Russell_diagram

    The H-R diagram can be used by scientists to roughly measure how far away a star cluster or galaxy is from Earth. This can be done by comparing the apparent magnitudes of the stars in the cluster to the absolute magnitudes of stars with known distances (or of model stars).

  8. NGC 1502 - Wikipedia

    en.wikipedia.org/wiki/NGC_1502

    One of the brightest candidate members of the cluster is the eclipsing binary SZ Cam, which is a component of a visual double star ADS 2984. [2] There are eleven variable stars and four candidate variables among the cluster members, including a β Cep , two periodic B-type variables, 2–3 eclipsing variables, and an RR Lyrae star. [ 7 ]

  9. Messier 39 - Wikipedia

    en.wikipedia.org/wiki/Messier_39

    Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, sometimes referred to as the Pyramid Cluster. It is positioned two degrees south of the star Pi Cygni [ 7 ] and around 9° east-northeast of Deneb . [ 8 ]

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