Astronomy:56 Cygni
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 20h 50m 04.93165s[2] |
| Declination | +44° 03′ 33.4916″[2] |
| Apparent magnitude (V) | 5.06[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A6 V[4] |
| B−V color index | 0.198±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | −21.5±3.5[3] km/s |
| Proper motion (μ) | RA: +123.197[2] mas/yr Dec.: +132.062[2] mas/yr |
| Parallax (π) | 24.2284 ± 0.0747[2] mas |
| Distance | 134.6 ± 0.4 ly (41.3 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.00[1] |
| Details | |
| Mass | 1.89[5] M☉ |
| Radius | 1.92[5] R☉ |
| Luminosity | 12.8[5] L☉ |
| Surface gravity (log g) | 4.15±0.07[5] cgs |
| Temperature | 7,895±127[5] K |
| Rotational velocity (v sin i) | 73[6] km/s |
| Age | 394[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
56 Cygni is a single[9] star in the northern constellation of Cygnus, located 135[2] light years from Earth. It is visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.06.[3] The star is moving closer to the Earth with a heliocentric radial velocity of −21.5.[3] It has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.181″/yr.[10] According to Eggen (1998), this is a member of the Hyades Supercluster.[11]
This is an A-type main-sequence star with a stellar classification of A6 V.[4] Cowley et al. (1969) classified it as a Delta Delphini star,[12] which is a type of suspected Am star. The star is around 394[7] million years old with a projected rotational velocity of 73 km/s.[6] It has 1.9 times the mass of the Sun and is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 7,895 K.[5]
56 Cygni has a visual companion: a magnitude 11.9 star at an angular separation of 55.4″ along a position angle of 48°, as of 2015.[13]
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 4.0 4.1 Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 6.0 6.1 Royer, F. et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
- ↑ 7.0 7.1 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "56 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=56+Cyg.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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.
- ↑ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal 116 (1): 284–292, doi:10.1086/300413, Bibcode: 1998AJ....116..284E.
- ↑ Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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