Astronomy:72 Cygni
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 | |
| 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 astronomical unit|AU. This star has a J band (infrared) magnitude of 13.224±0.025 and a class of M5.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 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. doi:10.1086/132025. Bibcode: 1987PASP...99..629K.
- ↑ 5.0 5.1 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, doi:10.1088/0004-637X/792/2/119, 119, Bibcode: 2014ApJ...792..119D.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 8.0 8.1 8.2 8.3 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, doi:10.1093/mnras/stw852, Bibcode: 2016MNRAS.460.1356R.
- ↑ "72 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=72+Cyg.
- ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
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