Editing Alpha Centauri (section)

=== Historical distance estimates ===

:{| class="wikitable sortable mw-collapsible"
|+ Alpha Centauri AB historical distance estimates
|-
! rowspan="2" | Source 
! rowspan="2" |Year
! rowspan="2" |Subject!! rowspan="2" | Parallax ([[milliarcsecond|mas]]) !! colspan="3" | Distance !! rowspan="2" | References
|-
![[parsec]]s !! [[light-year]]s !! [[petametre]]s
|-
| H. Henderson || 1839 || AB || {{val|1160|110}} || {{val|0.86|0.09|0.07}} || 2.81 ± 0.53 || {{val|26.6|2.8|2.3}} ||<ref name="Henderson1839" />
|-
| T. Henderson
|1842
|AB
| {{val|912.8|64}}
| 1.10 ± 0.15
| 3.57 ± 0.5
| {{val|33.8|2.5|2.2}}
|<ref>{{cite journal |last=Henderson|first=T.|title=The parallax of {{nobr|α Centauri,}} deduced from Mr. Maclear's observations at the Cape of Good Hope, in the years 1839 and 1840 |journal=Memoirs of the Royal Astronomical Society |volume=12 |pages=370–371 |year=1842 |bibcode=1842MmRAS..12..329H}}</ref>
|-
| Maclear
|1851
|AB
| {{val|918.7|34}}
| {{val|1.09|0.04}}
| {{val|3.55|0.14|0.13}}
| 32.4 ± 2.5
|<ref>{{cite journal|last=Maclear|first=T.|title=Determination of the Parallax of α 1 and α2 Centauri, from Observations made at the Royal Observatory, Cape of Good Hope, in the Years 1842-3-4 and 1848
|journal=Memoirs of the Royal Astronomical Society|volume=20|page=98|year=1851|bibcode=1851MmRAS..20...70M}}</ref>
|-
| Moesta
|1868
|AB
| {{val|880|68}}
| {{val|1.14|0.10|0.08}}
| {{val|3.71|0.31|0.27}}
| {{val|35.1|2.9|2.5}}
|<ref>{{cite journal|last=Moesta|first=C. G.|title=Bestimmung der Parallaxe von α und β Centauri|trans-title=Determining the parallax of α and β Centauri|language=de|journal=Astronomische Nachrichten|year=1868
|volume=71|issue=8|pages=117–118|bibcode=1868AN.....71..113M|doi=10.1002/asna.18680710802|url=https://zenodo.org/record/1424671}}</ref>
|-
| Gill & Elkin
|1885
|AB
| {{val|750|10}}
| {{val|1.333|0.018}}
| {{val|4.35|0.06}}
| {{val|41.1|0.6|0.5}}
|<ref>{{cite journal|last1=Gill|first1=David|last2=Elkin|first2=W. L.|title=Heliometer-Determinations of Stellar Parallax in the Southern Hemisphere|journal=Memoirs of the Royal Astronomical Society|year=1885
|volume=48|page=188|bibcode=1885MmRAS..48....1G}}</ref>
|-
| Roberts
|1895
|AB
| {{val|710|50}}
| 1.32 ± 0.2
| 4.29 ± 0.65
| {{val|43.5|3.3|2.9}}
|<ref>{{cite journal|last=Roberts|first=Alex W.|title=Parallax of α Centauri from Meridian Observations 1879–1881|journal=Astronomische Nachrichten|year=1895|volume=139|issue=12|pages=189–190 |bibcode=1895AN....139..177R|doi=10.1002/asna.18961391202|url=https://zenodo.org/record/1424747}}</ref>
|-
| Woolley ''et al.''
|1970
|AB
| {{val|743|7}}
| {{val|1.346|0.013}}
| {{val|4.39|0.04}}
| {{val|41.5|0.4}}
|<ref name="Woolley1970">{{cite journal|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/32A&Woolley=559|title=Woolley 559|volume=5|page=ill|journal=Catalogue of Stars within 25 Parsecs of the Sun
|last1=Woolley|first1=R.|last2=Epps|first2=E. A.|last3=Penston|first3=M. J.|last4=Pocock|first4=S. B.|year=1970|bibcode=1970ROAn....5.....W|access-date=9 May 2014|archive-url=https://web.archive.org/web/20171008231243/http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V%2F32A&Woolley=559|archive-date=8 October 2017|url-status=live}}</ref>
|-
| Gliese & Jahreiß
|1991
|AB
| {{val|749.0|4.7}}
| {{val|1.335|0.008}}
| {{val|4.355|0.027}}
| {{val|41.20|0.26}}
|<ref name="Gliese1991">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/70A&Name=Gl%20559|title=Gl 559|work=Preliminary Version of the Third Catalogue of Nearby Stars |publisher=Astronomische Rechen-Institut|last1=Gliese|first1=W.|last2=Jahreiß|first2=H.|year=1991|access-date=9 May 2014}}</ref>
|-
| van Altena ''et al.''
| 1995
| AB
| {{val|749.9|5.4}}
| {{val|1.334|0.010}}
| {{val|4.349|0.032|0.031}}
| {{val|41.15|0.30|0.29}}
|<ref>{{cite report |last1=van Altena |first1=W.F. |last2=Lee |first2=J.T. |last3=Hoffleit |first3=E.D. |year=1995 |section=GCTP 3309 |title=The General Catalogue of Trigonometric Stellar Parallaxes |publisher=Yale University Observatory |edition=4th |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/238A/picat&GCTP=3309 |access-date=9 May 2014}}</ref>
|-
| Perryman ''et al.''
| 1997
| AB
| {{val|742.12|1.40}}
| {{val|1.3475|0.0025}}
| {{val|4.395|0.008}}
| {{val|41.58|0.08}}<ref name=Perryman1997_tyc_A>
{{cite report
 |last=Perryman |first= |year=1997 |display-authors=etal
 |title=HIP 71683
 |series=The Hipparcos and Tycho Catalogues
 |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/tyc_main&HIP=71683
 |access-date=9 May 2014
}}
</ref><ref name=Perryman1997_tyc_B>
{{cite report
 |last=Perryman |first= |year=1997 |display-authors=etal
 |title=HIP 71681
 |series=The Hipparcos and Tycho Catalogues
 |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/tyc_main&HIP=71681
 |access-date=9 May 2014}}</ref>
|-
| Söderhjelm
| 1999
| AB
| {{val|747.1|1.2}}
| {{val|1.3385|0.0022|0.0021}}
| {{val|4.366|0.007}}
| {{val|41.30|0.07}}
|<ref>{{cite report |last =Söderhjelm |first =Staffan |year=1999 |title=HIP 71683 |section=Visual binary orbits and masses post Hipparcos |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=J/A+A/341/121&HIP=71683 |access-date=9 May 2014}}</ref>
|-
|rowspan="2"| van Leeuwen
|rowspan="2"| 2007
| A
| {{val|754.81|4.11}}
| {{val|1.325|0.007}}
| {{val|4.321|0.024|0.023}}
| {{val|40.88|0.22}}
|<ref>{{cite report |last=van Leeuwen |first=Floor |year=2007 |title=HIP 71683 |section=Validation of the new Hipparcos reduction |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/311&HIP=71683}}</ref>
|-
| B
| {{val|796.92|25.90}}
| {{val|1.25|0.04}}
| {{val|4.09|0.14|0.13}}
| 37.5 ± 2.5
|<ref>{{cite report |last=van Leeuwen |first=Floor |year=2007 |title=HIP 71681 |section=Validation of the new Hipparcos reduction |url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/311&HIP=71681 }}</ref>
|-
| RECONS TOP100
|2012
|AB
| {{val|747.23|1.17}}{{efn|
Weighted parallax based on parallaxes from {{harvp|van Altena|Lee||Hoffleit|1995}} and {{harvp|Söderhjelm|1999}}.
}}
| {{val|1.3383|0.0021}}
| {{val|4.365|0.007}}
| {{val|41.29|0.06}}
|<ref name="RECONS">{{cite report |series=Research Consortium on Nearby Stars |publisher=Georgia State University |date=7 September 2007 |title=The one hundred nearest star systems |url=http://www.astro.gsu.edu/RECONS/TOP100.posted.htm |access-date=2 December 2014 |url-status=live |archive-url=https://web.archive.org/web/20071112173559/http://www.chara.gsu.edu/RECONS/TOP100.posted.htm |archive-date=12 November 2007 }}</ref>
|}