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NGC 3532
NGC 3532, also known as the Football Cluster,〔Amateur Astronomer Association of New York, (Nebula of the Month - Carina's Football )〕〔IceInSpace - Australian Amateur Astronomy, (Challenge Objects - June 2005 ), 2005〕 and the Black Arrow Cluster,〔Stephen Chadwick and Ian Cooper "Imaging the Southern Sky" Springer 2013, p.94〕 is an open cluster in the constellation Carina, lies some 1,321〔 light years away. It consists of approximately 150 stars of 7th magnitude or fainter, including seven red giants〔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〕 and seven white dwarfs.〔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〕 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 NCG 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 Carinae) is the nearest naked-eye star, but it is not a member of the cluster. NGC 3532 lies near the Eta Carinae nebula (NGC 3372) and several other prominent open clusters like NGC 3293 and IC 2581.
The cluster was first catalogued by Nicolas Louis de Lacaille in 1751. It was admired by John Herschel, who thought it one of the finest irregular clusters in the sky,〔Deep Sky Observer's Companion – the online database, (DOCdb Lacaille II.10 )〕 with many double stars (binary stars).〔ScienceDaily, ("A colorful gathering of middle-aged stars" ), European Southern Observatory, 26 November 2014〕
==References==
* Ridpath, Ian & Tirion, Wil, ''Collins Guide to Stars & Planets'', Collins, 2007
* Bakich, Michael E. (editor), ''Hubble’s Greatest Pictures'', Kalmbach, 2008
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