Open cluster in the constellation Carina
NGC 3532Right ascension 11h 05m 33s [1] Declination −58° 43.8′[1] Distance 1,321[2] ly (405 pc ) Other designations NGC 3532,[1] Caldwell 91, Cr 238, Mel 103, C 1104-584, Cl* 1104-584, CL 1104-584, Lacaille II.10,[3] Football Cluster, Wishing Well Cluster[4] [5] [6] [7] Constellation Carina See also: Open cluster , List of open clusters
NGC 3532 (Caldwell 91),[8] also commonly known as the Pincushion Cluster ,[9] [10] [11] [8] Football Cluster ,[12] [13] the Black Arrow Cluster ,[14] or the Wishing Well Cluster ,[4] [5] [6] [7] is an open cluster some 405 parsecs from Earth [2] in the constellation Carina . Its population of approximately 150 stars of 7th magnitude or fainter includes seven red giants [15] and seven white dwarfs .[16] [17] On 20 May 1990 it became the first target ever observed by the Hubble Space Telescope . A line from Beta Crucis through Delta Crucis passes somewhat to the north of 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 (V382 Car ) 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] It was admired by John Herschel , who thought it one of the finest star clusters in the sky,[3] [19] with many double stars (binary stars ).[20]
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^ a b Deep Sky Observer's Companion – the online database, DOCdb Lacaille II.10
^ a b Nemiroff, R.; Bonnell, J., eds. (26 February 2010). "Chasing Carina" . Astronomy Picture of the Day . NASA . Retrieved 17 April 2016 .
^ a b Hook, Richard (26 November 2014). "A Colourful Gathering of Middle-aged Stars" . European Southern Observatory . ESO . Retrieved 17 April 2016 .
^ a b Kramer, Miriam (26 November 2014). "Wishing Well Star Cluster Sparkles in Colorful New Views" . Space.com . Space.com. Retrieved 17 April 2016 .
^ a b Frommert, Hartmut; Kronberg, Christine (23 June 2006). "NGC 3532" . SEDS Messier Database . SEDS. Retrieved 17 April 2016 .
^ a b Martin Mobberley (Oct 2009). The Caldwell Objects and How to Observe Them . Springer. p. 190. ISBN 978-1-4419-0326-6 .
^ Stephen James O'Meara, The Caldwell Objects , Cambridge University Press, ISBN 0-521-82796-5 , p. 358–360.
^ Mike Inglis (July 2013). Observer's Guide to Star Clusters . Springer . p. 55. Bibcode :2013ogsc.book.....I . ISBN 978-1-4614-7567-5 .
^ Michael E. Bakich (July 2010). 1,001 Celestial Wonders to See Before You Die . Springer. p. 80. Bibcode :2010ocws.book.....B . ISBN 978-1-4419-1777-5 .
^ Amateur Astronomer Association of New York, Nebula of the Month - Carina's Football
^ IceInSpace - Australian Amateur Astronomy, Challenge Objects - June 2005 , 2005
^ Chadwick, S; Cooper, I (11 December 2012). Imaging the Southern Sky . New York: Springer. p. 94. ISBN 978-1461447498 .
^ Claria, J.J., Lapasset, E., (1988) "A UBV and DDO astrophysical study of the open cluster NGC3532", Monthly Notices of the Royal Astronomical Society , 235, 1129–1139
^ Reimers, D., Koester, D., (1989) "Spectroscopic identification of white dwarfs in galactic clusters. V - NGC 3532", Astronomy & Astrophysics, 218, 118–122
^ Dobbie, P., Day-Jones, A., Williams, K., Casewell, S., Burleigh, M., Lodieu, N., Parker, Q., Baxter, R. (2012) "Further investigation of white dwarfs in the open clusters NGC2287 and NGC3532", Monthly Notices of the Royal Astronomical Society, 423, 2815–2828
^ Jones, K. G. (March 1969). "The search for the nebulae - VI". Journal of the British Astronomical Association . 79 : 213–222. Bibcode :1969JBAA...79..213J .
^ Herschel, J. (1847). Results of Astronomical Observations Made During the Years 1834, 5, 6, 7, 8, at the Cape of Good Hope . London, Smith, Elder &Co.
^ ScienceDaily, "A colorful gathering of middle-aged stars" , European Southern Observatory, 26 November 2014