Editing Deneb (section)

{{short description|Star in the constellation Cygnus}}
{{About|the star}}
{{Starbox begin}}
{{Starbox image
 | image=
   {{Location mark
     | image=Cygnus constellation map.svg
     | float=center | width=250 | position=right
     | mark=Red circle.svg | mark_width=10 | mark_link=Deneb (star)
     | x%=32.5 | y%=36.9
   }}
 | caption=Location of Deneb
}}
{{Starbox observe
 | epoch=J2000
 | constell=[[Cygnus (constellation)|Cygnus]]
 | pronounce={{IPAc-en|'|d|ɛ|n|ɛ|b|}}, {{IPAc-en|'|d|ɛ|n|ə|b|}}<ref name=merriam>{{cite book|author=Merriam-Webster, Inc|title=Merriam-Webster's Collegiate Dictionary|url=https://books.google.com/books?id=53-PQgAACAAJ|year=1998|publisher=Merriam-Webster|isbn=978-0-87779-714-2}}</ref>
 | ra={{RA|20|41|25.9}}<ref name=hipparcos/>|dec={{DEC|+45|16|49}}<ref name=hipparcos/>
 | appmag_v=1.25<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR On-Line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|pages=0|last1=Ducati|first1=J. R.|year=2002}}</ref> {{nowrap|(1.21–1.29<ref name=gcvs>{{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|pages=02025|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|display-authors=etal}}</ref>)}}
}}
{{Starbox character
 | class=A2&nbsp;Ia<ref name=baas25_1319>{{Cite journal |last1=Garrison |first1=R. F. |title=Anchor Points for the MK System of Spectral Classification |journal=[[Bulletin of the American Astronomical Society]] |volume=25 |page=1319 |year=1993 |bibcode=1993AAS...183.1710G |url=http://www.astro.utoronto.ca/~garrison/mkstds.html |access-date=2012-02-04 |archive-date=2019-06-25 |archive-url=https://web.archive.org/web/20190625094716/http://www.astro.utoronto.ca/~garrison/mkstds.html |url-status=dead }}</ref>
 | b-v=+0.09<ref name=ducati/>
 | u-b=−0.23<ref name=ducati/>
 | variable=[[Alpha Cygni variable|Alpha Cygni]]<ref name=gcvs/>
|type=[[Blue supergiant]]}}
{{Starbox astrometry
 | radial_v=−4.5<ref name=pulkovo>{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}</ref>
 | prop_mo_ra=1.99<ref name=hipparcos/>
 | prop_mo_dec=1.95<ref name=hipparcos/>
 | parallax=2.31
 | p_error=0.32
 | parallax_footnote=<ref name=hipparcos/>
 | dist_ly={{val|1410|196|fmt=commas}} or {{val|2,615|215|fmt=commas}}
 | dist_pc={{val|433|60}}<ref name=hipparcos/> or {{val|802|66}}<ref name=schiller/>
 | absmag_v=−8.38<ref name=schiller/>
}}
{{Starbox detail
 | mass = {{val|15.5|0.8}}<ref name=Tetzlaff2011>{{Cite journal |last1=Tetzlaff |first1=N. |last2=Neuhäuser |first2=R. |last3=Hohle |first3=M. M. |date=2011-01-01 |title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun |journal=Monthly Notices of the Royal Astronomical Society |volume=410 |issue=1 |pages=190–200 |doi=10.1111/j.1365-2966.2010.17434.x |doi-access=free |arxiv=1007.4883 |bibcode=2011MNRAS.410..190T |issn=0035-8711}}</ref> or {{Val|19|4}}<ref name=Tetzlaff2011/>
 | radius = {{Val|117|14|19}}
<ref name=Baines2025>{{Cite journal |last1=Baines |first1=Ellyn K. |last2=Clark |first2=James H. |last3=Kingsley |first3=Bradley I. |last4=Schmitt |first4=Henrique R. |last5=Stone |first5=Jordan M. |date=2025-05-07 |title=Vintage NPOI: New and Updated Angular Diameters for 145 Stars |journal=The Astronomical Journal |language=en |volume=169 |issue=6 |pages=293 |doi=10.3847/1538-3881/adc930 |doi-access=free |bibcode=2025AJ....169..293B |issn=1538-3881}} Note: Full catalogue: [https://content.cld.iop.org/journals/1538-3881/169/6/293/revision1/ajadc930t7_mrt.txt]</ref> or {{Val|203|17}}<ref name=schiller>{{cite journal
  | last1=Schiller | first1=F.
  | last2=Przybilla | first2=N.
  | date=2008
  | title=Quantitative spectroscopy of Deneb
  | journal=[[Astronomy & Astrophysics]]
  | volume=479 | issue=3 | pages=849–858
  | arxiv=0712.0040
  | bibcode=2008A&A...479..849S
  | doi=10.1051/0004-6361:20078590
| s2cid=119225384
 }}</ref>
 | luminosity = {{val|55100|10000|fmt=commas}}<ref name="chesneau2"/> or {{Val|196000|32000|fmt=commas}}<ref name=schiller/>
 | age_myr = {{val|11.6|0.5}}<ref name=Tetzlaff2011/>
 | temperature = {{Val|8700|150|fmt=commas}}<ref>{{Cite journal |last1=Georgy |first1=Cyril |last2=Saio |first2=Hideyuki |last3=Meynet |first3=Georges |date=2021-06-01 |title=Blue supergiants as tests for stellar physics |url=https://www.aanda.org/articles/aa/abs/2021/06/aa40105-20/aa40105-20.html |journal=Astronomy & Astrophysics |language=en |volume=650 |pages=A128 |doi=10.1051/0004-6361/202040105 |arxiv=2104.06278 |bibcode=2021A&A...650A.128G |issn=0004-6361}}</ref>
 | rotational_velocity = {{Val|20|2}}<ref name=schiller/>
 | gravity = {{Val|1.10|0.05}}<ref name=schiller/>{{snd}}1.45<ref name=Albayrak>{{Cite journal |last=Albayrak |first=B. |date=2000-12-01 |title=A spectral analysis of Deneb (A2 Iae) |bibcode=2000A&A...364..237A |journal=Astronomy and Astrophysics |volume=364 |pages=237–248 |issn=0004-6361}}</ref>
 | metal_fe = −0.25<ref name=schiller/>
}}
{{Starbox catalog
 | names={{odlist | name=Arided | name2=Aridif | name3=Gallina | name4=Arrioph | B=α Cygni | F=50 Cygni | BD=+44°3541 | FK5=777 | HD=197345 | HIP=102098 | HR=7924 | SAO=49941 }}
}}
{{Starbox reference
 | Simbad=Deneb
}}
{{Starbox end}}

'''Deneb''' ({{IPAc-en|ˈ|d|ɛ|n|ɛ|b}}) is a [[blue supergiant]] [[star]] in the [[constellation]] of [[Cygnus (constellation)|Cygnus]]. It is the brightest star in the constellation and the [[List of brightest stars|19th brightest]] in the [[night sky]], with an [[apparent magnitude]] slightly varying between +1.21 and +1.29. Deneb is one of the vertices of the [[Asterism (astronomy)|asterism]] known as the [[Summer Triangle]] and the "head" of the [[Northern Cross (asterism)|Northern Cross]]. Its [[Bayer designation]] is '''α Cygni''', which is [[Latinisation of names|Latinised]] to '''Alpha Cygni''', abbreviated to '''Alpha Cyg''' or '''α Cyg'''. 

Deneb rivals [[Rigel]], a closer blue supergiant, as the most luminous [[first-magnitude star]]. However, its distance, and hence luminosity, is poorly known; its luminosity is estimated to be between 55,000 and 196,000 times [[Solar luminosity|that of the Sun]]. Distance estimates range from 1,400 to 2,600 light-years; assuming its highest value, it is the farthest star with an apparent magnitude brighter than 2.50.