View source for NGC 6087

{{Short description|Open cluster in the constellation Norma}}
{{Infobox open cluster
| image = NGC 6087 full.png
| name = [[New General Catalogue|NGC]] 6087
| type = [[Open Cluster]]
| epoch = [[J2000]]
| ra = {{RA|16|18|48}}<ref name="simbad">{{cite simbad
  | title=NGC 6087
  | access-date=2007-04-18}}</ref>
| dec = {{DEC|-57|56}}<ref name="simbad" />
| dist_ly = ~3500LY 
| dist_pc = ~1000pc
| appmag_v = 5.4
| size_v = 12{{prime}}
| radius_ly = 
| absmag_v = 
| constellation = [[Norma (constellation)|Norma]]
| notes = 
| names = S Normae Cluster, [[Caldwell catalogue|Caldwell]] 89, [[Collinder catalogue|Cr]] 300
}}
[[File:NGC 6087 map.png|thumbnail|Map showing the location of NGC 6087]]
'''NGC 6087''' (also known as '''Caldwell 89''' or the '''S Normae Cluster''') is an [[open cluster]] of 40 or more<ref>[[Robert Burnham Jr.|Burnham]]'s ''Celestial Handbook'' gives the number 40, though other studies go as high as 349; see Stephen James O'Meara, ''The Caldwell Objects'', Cambridge University Press, 2002, p. 351.</ref><ref name="Landolt" /> stars centered on the [[Cepheid variable]] [[S Normae]] in the [[constellation]] [[Norma (constellation)|Norma]].  At a distance of about 3500 [[light year|ly]] and covering a field of almost one quarter of a degree, the stars range from seventh- to eleventh-magnitude, the brightest being 6.5 magnitude S Normae.  The aggregate visual magnitude of the cluster is about 5.4.

Spectral analysis of the radial motion of the stars confirm that S Normae is a member of the cluster,<ref name="Landolt">{{cite journal 
|author=A. U. Landolt
|year=1964
|title=The Galactic Cluster NGC 6087
|journal=Astrophysical Journal Supplement
|volume=8
|pages=329–351
|bibcode = 1964ApJS....8..329L |doi = 10.1086/190092 |doi-access=free
}}</ref> and the period/luminosity relationship of Cepheid variables allows the distance to be determined with confidence.

==References==
{{reflist}}

==External links==
* {{commonscat-inline}}
*{{WikiSky}}


{{Sky|16|18|48|-|57|56|00|1}}
{{Caldwell catalogue}}
{{NGC65}}
{{Norma (constellation)}}

{{DEFAULTSORT:NGC 6087}}
[[Category:Open clusters]]
[[Category:Norma (constellation)]]
[[Category:NGC objects|6087]]
[[Category:Caldwell objects|089b]]