| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21 34 46.58574 |
| Declination | +38° 32′ 02.6267″ |
| Apparent magnitude (V) | 4.87 |
| Characteristics | |
| Spectral type | K0.5 III Fe0.5 or K0.5 III CN 0.5 + M5 |
| B−V color index | 1.092 |
| Astrometry | |
| Radial velocity (Rv) | −68.12±0.11 km/s |
| Proper motion (μ) | RA: +113.665 mas/yr Dec.: +100.403 mas/yr |
| Parallax (π) | 14.2468 ± 0.1339 mas |
| Distance | 229 ± 2 ly (70.2 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.62 |
| Details | |
| Mass | 1.70 M☉ |
| Radius | 14 R☉ |
| Luminosity | 69 L☉ |
| Surface gravity (log g) | 2.68±0.04 cgs |
| Temperature | 4,640±25 K |
| Metallicity | 0.18 dex |
| Rotational velocity (v sin i) | 1.4 km/s |
| Age | 900±200 Myr |
| Other designations | |
| 72 Cyg, BD+37°4359, FK5 3722, HD 205512, HIP 106551, HR 8255, SAO 71480 | |
| Database references | |
| SIMBAD | data |
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 0.154″ per year.
This is an aging giant star with a stellar classification of 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 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.
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, S2CID 119257644.
- ^ 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, S2CID 38354181, 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, S2CID 121883397.
- ^ 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, S2CID 118505114.
- ^ 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, S2CID 2603568.