72 Cygni
{{short description|K-type giant star in the constellation Cygnus}}
{{Starbox begin
| name = 72 Cygni
}}
{{Starbox observe
| epoch = J2000
| constell = Cygnus
| dec = {{DEC|+38|32|02.6267}}
}}
{{Starbox character
| type =
| class = {{nowrap|K0.5 III Fe0.5}} or {{nowrap|K0.5 III CN 0.5}} + M5
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−68.12|0.11}}
| parallax = 14.2468
| p_error = 0.1339
}}
{{Starbox detail
| source =
| temperature = {{Val|4640|25|fmt=commas}}
}}
{{Starbox catalog
| names = {{odlist | F=72 Cyg | BD=+37°4359 | FK5=3722 | HD=205512 | HIP=106551 | HR=8255 | SAO=71480 }}
}}
{{Starbox reference
| Simbad=72+Cyg
}}
{{Starbox end}}
72 Cygni is a star in the northern constellation of Cygnus, located 299 light years from the Sun and a member of the Hercules stream. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.87. 72 Cyg is moving closer to the Earth with a heliocentric radial velocity of −68 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of {{Val|0.154|ul=arcsecond}} per year.
This is an aging giant star with a stellar classification of {{nowrap|K0.5 III Fe0.5}}, where the suffix notation indicates a mild underabundance of iron in the spectrum. It has 1.7 times the mass of the Sun but has expanded to 14 times the Sun's radius. The star is radiating 69 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,640 K.
72 Cygni has a wide companion at an angular separation of {{val|66.1|u=arcsecond}}, corresponding to a projected separation of {{Val|4690|ul=AU|fmt=commas}}. This star has a J band (infrared) magnitude of {{Val|13.224|0.025}} and a class of M5.
References
{{reflist|refs=
{{cite simbad | title=72 Cyg | access-date=2019-01-20 }}
{{Cite Gaia DR2|1953794542947272192}}
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| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}
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| title=Wide Cool and Ultracool Companions to Nearby Stars from Pan-STARRS 1
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| bibcode=2014ApJ...792..119D | arxiv=1407.2938 | s2cid=38354181}}
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| title=Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity
| display-authors=1 | 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 }}
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| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)
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| volume=129 | issue=3 | pages=1483–1522 | date=March 2005
| doi=10.1086/427854 | bibcode=2005AJ....129.1483L
| arxiv=astro-ph/0412070 | s2cid=2603568 | postscript=. }}
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| title=The Perkins catalog of revised MK types for the cooler stars
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
}}
{{Stars of Cygnus}}
Category:Cygnus (constellation)