52 Cygni

{{short description|Binary star system in the constellation Cygnus}}

{{Starbox image

| image=

{{Location mark

|image=Cygnus constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=52 Cygni

|x=264|y=625

}}

|caption=Location of 52 Cygni (circled)

}}

{{Starbox observe 2s

| epoch=J2000

| constell=Cygnus

| component1=A

| ra1={{RA|20|45|39.75304}}

| dec1={{DEC|+30|43|10.9756}}

| appmag_v1=4.22

| component2=B

| ra2={{RA|20|45|40.206}}

| dec2={{DEC|+30|43|12.96}}

| appmag_v2=11.06

}}

{{Starbox character

| type = red clump

| class=G9.5III

| b-v=+1.05

| u-b=+0.88

| variable=

}}

{{Starbox astrometry

| radial_v=–0.72

| prop_mo_ra=–8.98

| prop_mo_dec=+24.11

| parallax=16.22

| p_error=0.19

| parallax_footnote=

| absmag_v=+0.27

}}

{{Starbox detail

| mass=2.07

| radius=13.81

| luminosity=89

| temperature=4,677

| metal_fe=−0.24

| gravity=2.5

| rotational_velocity=3.7

| age_gyr=2.27

}}

{{Starbox catalog

| names=ADS 14259, BD+30 4167, WDS J20456+3043, CCDM J20457+3043

| component1=A

| names1=HR 7942, HD 197912, HIP 102453, SAO 70467

| component2=B

| names2=TYC 2687-2652-1

}}

{{Starbox reference

| Simbad=52+Cygni|sn=A

| Simbad2=52+Cygni+B|sn2=B

}}

File:NGC6960 Veil Nebula Supernova Remnant from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg]]

52 Cygni is a giant star in the northern constellation of Cygnus with an apparent magnitude of 4.22. Based on its Hipparcos parallax, it is about {{convert|291|ly|pc}} away.

52 Cygni is a probable horizontal branch (red clump) star, fusing helium in its core, although there is a 25% chance that it is still on the red giant branch (RGB) and fusing hydrogen in a shell around an insert core. As a clump giant it would be 2.27 billion years old, but only 910 million years if 52 Cygni is an RGB star. It shines with a bolometric luminosity of about {{solar luminosity|90}} at an effective temperature of 4,677 K. It has a radius of {{solar radius|about 14}}.

At an angular separation of 6.0″ from 52 Cygni is a faint magnitude 9.5 companion.

References

{{reflist|refs=

{{citation |bibcode=2012AstL...38..331A |title=XHIP: An extended hipparcos compilation |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |journal=Astronomy Letters |date=2012 |volume=38 |issue=5 |page=331 |doi=10.1134/S1063773712050015 |arxiv=1108.4971 }}

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| s2cid=18759600 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=114184 Vizier catalog entry ]

{{citation

| display-authors=1

| last1=Famaey | first1=B.

| last2=Jorissen | first2=A.

| last3=Luri | first3=X.

| last4=Mayor | first4=M.

| last5=Udry | first5=S.

| last6=Dejonghe | first6=H.

| last7=Turon | first7=C.

| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters

| journal=Astronomy and Astrophysics

| volume=430 | issue=1 | pages=165–186 | date=January 2005

| doi=10.1051/0004-6361:20041272

| bibcode=2005A&A...430..165F

| arxiv=astro-ph/0409579

| s2cid=17804304 }}

{{citation

| display-authors=1

| last1=Massarotti | first1=Alessandro

| last2=Latham | first2=David W.

| last3=Stefanik | first3=Robert P.

| last4=Fogel | first4=Jeffrey

| title=Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity

| journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231

| date=January 2008

| doi=10.1088/0004-6256/135/1/209

| bibcode=2008AJ....135..209M

| s2cid=121883397 | doi-access=free}}

{{citation

| last1=Mermilliod | first1=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data. SIMBAD

| date=1986 | bibcode=1986EgUBV........0M

}}

{{Cite journal | doi = 10.1111/j.1365-2966.2008.13596.x| title = A catalogue of multiplicity among bright stellar systems| year = 2008| last1 = Eggleton | first1 = P. P.| last2 = Tokovinin | first2 = A. A.| journal = Monthly Notices of the Royal Astronomical Society| volume = 389| issue = 2| pages = 869| doi-access = free| bibcode = 2008MNRAS.389..869E|arxiv = 0806.2878 | s2cid = 14878976}}

{{cite journal | bibcode=2000A&A...355L..27H | title=The Tycho-2 catalogue of the 2.5 million brightest stars | journal=Astronomy and Astrophysics | volume=355 | pages=L27 | last1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | year=2000 }}

{{cite journal|doi=10.1051/0004-6361/201322360|arxiv=1412.4634|title=Precise radial velocities of giant stars|journal=Astronomy & Astrophysics|volume=574|pages=A116|year=2015|last1=Reffert|first1=Sabine|last2=Bergmann|first2=Christoph|last3=Quirrenbach|first3=Andreas|last4=Trifonov|first4=Trifon|last5=Künstler|first5=Andreas|bibcode=2015A&A...574A.116R|s2cid=59334290}}

}}

Category:G-type giants

Category:Horizontal-branch stars

Category:Binary stars

Category:Cygnus (constellation)