72 Cygni

72 Cygni
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	21h 34m 46.58574s[1]
Declination	+38° 32′ 02.6267″[1]
Apparent magnitude (V)	4.87[2]
Characteristics
Spectral type	K0.5 III Fe0.5[3] or K0.5 III CN 0.5[4] + M5[5]
B−V color index	1.092[6]
Astrometry
Radial velocity (Rv)	−68.12±0.11[6] km/s
Proper motion (μ)	RA: +113.665[1] mas/yr ; Dec.: +100.403[1] mas/yr
Parallax (π)	14.2468 ± 0.1339[1] mas
Distance	229 ± 2 ly ; (70.2 ± 0.7 pc)
Absolute magnitude (MV)	0.62[2]
Details
Mass	1.70[7] M☉
Radius	14[6] R☉
Luminosity	69[7] L☉
Surface gravity (log g)	2.68±0.04[8] cgs
Temperature	4,640±25[7] K
Metallicity [Fe/H]	0.18[8] dex
Rotational velocity (v sin i)	1.4[6] km/s
Age	900±200[8] Myr
Other designations
	72 Cyg, BD+37°4359, FK5 3722, HD 205512, HIP 106551, HR 8255, SAO 71480[9]
Database references
SIMBAD	data

72 Cygni is a star in the northern constellation of Cygnus, located 299 light years from the Sun[1] and a member of the Hercules stream.[8] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.87.[2] 72 Cyg is moving closer to the Earth with a heliocentric radial velocity of −68 km/s.[6] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154″ per year.[10]

This is an aging giant star with a stellar classification of K0.5 III Fe0.5,[3] where the suffix notation indicates a mild underabundance of iron in the spectrum. It has 1.7[7] times the mass of the Sun but has expanded to 14[6] times the Sun's radius. The star is radiating 69[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,640 K.[7]

72 Cygni has a wide companion at an angular separation of 66.1″, corresponding to a projected separation of 4,690 AU. This star has a J band (infrared) magnitude of 13.224±0.025 and a class of M5.[5]

References

Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
Keenan, Philip C.; et al. (July 1987). "Recognition and classification of strong-CN giants". Publications of the Astronomical Society of the Pacific. 99: 629–636. Bibcode:1987PASP...99..629K. doi:10.1086/132025.
Deacon, Niall R.; et al. (September 2014), "Wide Cool and Ultracool Companions to Nearby Stars from Pan-STARRS 1", The Astrophysical Journal, 792 (2): 40, arXiv:1407.2938, Bibcode:2014ApJ...792..119D, doi:10.1088/0004-637X/792/2/119, 119.
Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
Ramya, P.; et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society, 460 (2): 1356−1370, arXiv:1604.04821, Bibcode:2016MNRAS.460.1356R, doi:10.1093/mnras/stw852.
"72 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-20.
Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.

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[GaiaDR2-1] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Anderson2012-2] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.

[perkins1989-3] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[Keenan1987-4] Keenan, Philip C.; et al. (July 1987). "Recognition and classification of strong-CN giants". Publications of the Astronomical Society of the Pacific. 99: 629–636. Bibcode:1987PASP...99..629K. doi:10.1086/132025.

[Deacon2014-5] Deacon, Niall R.; et al. (September 2014), "Wide Cool and Ultracool Companions to Nearby Stars from Pan-STARRS 1", The Astrophysical Journal, 792 (2): 40, arXiv:1407.2938, Bibcode:2014ApJ...792..119D, doi:10.1088/0004-637X/792/2/119, 119.

[Massarotti2008-6] Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.

[Luck2015-7] Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.

[Ramya2016-8] Ramya, P.; et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society, 460 (2): 1356−1370, arXiv:1604.04821, Bibcode:2016MNRAS.460.1356R, doi:10.1093/mnras/stw852.

[SIMBAD-9] "72 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-20.

[Lepine2005-10] Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.