S Normae

{{Short description|Star in the constellation Norma}}

{{Starbox begin

| name=S Normae

}}

{{Starbox image

| image=

{{Location mark

|image=Norma constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=S Nor|x=420|y=688

}}

|caption=Location of S Normae (circled)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|16|18|51.8325}}{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|last1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 |s2cid=18759600}}

| dec={{DEC|−57|53|59.244}}

| appmag_v=6.394 {{nowrap|(6.12 - 6.77)}}

| constell=Norma

}}

{{Starbox character

| class={{nowrap|F8-G0Ib + B9.5V}}

| b-v=+1.00{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}

| u-b=+0.66

| variable=δ Cepheid{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

}}

{{Starbox astrometry

| radial_v=5.83{{cite journal|bibcode=2008A&A...485..303M|title=Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters|journal=Astronomy and Astrophysics|volume=485|pages=303–314|last1=Mermilliod|first1=J. C.|last2=Mayor|first2=M.|last3=Udry|first3=S.|year=2008|issue=1|doi=10.1051/0004-6361:200809664|citeseerx=10.1.1.30.7545}}

| prop_mo_ra=0.07

| prop_mo_dec=0.04

| parallax=1.16

| p_error=0.76

| parallax_footnote=

| dist_pc=924

| absmag_v=-4.02

}}

{{Starbox orbit

| reference =

| primary =

| name =

| period = 8,660

| period_unitless =

| axis =

| axis_unitless = 794 AU

| eccentricity =

| inclination =

| node =

| periastron =

| periarg =

| periarg_primary =

| k1 =

| k2 =

}}

{{Starbox detail

| source=

| mass=6.3

| radius=65.6{{cite journal|bibcode=2005AcA....55..247M|arxiv=astro-ph/0507076|title=Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids|journal=Acta Astronomica|volume=55|pages=247|last1=Moskalik|first1=P.|last2=Gorynya|first2=N. A.|year=2005}}

| luminosity=3,630

| temperature=6,350

| metal=+0.10{{cite journal|bibcode= 2009A&A...504..959K|title= Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes|journal= Astronomy and Astrophysics|volume= 504|issue= 3|pages= 959|last1= Klagyivik|first1= P.|last2= Szabados|first2= L.|year= 2009|doi= 10.1051/0004-6361/200811464|arxiv = 0908.3561 |s2cid= 18283579}}

| rotation=

| component2=companion

| mass2=2.4

| age_myr2=80{{cite journal|bibcode=2016A&A...585A.150N|arxiv=1511.08884|title=On the metallicity of open clusters. III. Homogenised sample|journal=Astronomy & Astrophysics|volume=585|pages=A150|last1=Netopil|first1=M.|last2=Paunzen|first2=E.|last3=Heiter|first3=U.|last4=Soubiran|first4=C.|year=2016|doi=10.1051/0004-6361/201526370|s2cid=118382876}}

}}

{{Starbox catalog

| names= S Nor, HR 6062, SAO 243586, CD−57°6342, GSC 08719-00158, HD 146323, NGC 6087 132, GC 21898, HIP 79932, NGC 6087 155

}}

{{Starbox reference

|Simbad=S+Normae

}}

{{Starbox end}}

File:NGC 6087 full.png NGC 6087.]]

S Normae (S Nor) is a yellow supergiant variable star in the constellation Norma. It is the brightest member of the open cluster NGC 6087.

S Normae is a Classical Cepheid variable with a visual magnitude range of 6.12 to 6.77 and a period of 9.75411 days. The spectral type varies during the pulsation cycle from F8 to G0. Its mass has been measured at {{solar mass|6.3}} with reference to a close orbital companion, and it is over 3,000 times as luminous as the sun.