| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 50m 04.93129s[1] |
| Declination | +44° 03′ 33.4862″[1] |
| Apparent magnitude (V) | 5.06[2] |
| Characteristics | |
| Spectral type | A6 V[3] |
| B−V color index | 0.198±0.002[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.5±3.5[2] km/s |
| Proper motion (μ) | RA: +123.450[1] mas/yr Dec.: +132.420[1] mas/yr |
| Parallax (π) | 24.1034 ± 0.1344 mas[1] |
| Distance | 135.3 ± 0.8 ly (41.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.00[4] |
| Details[5] | |
| Mass | 1.72 M☉ |
| Luminosity | 13.19[4] L☉ |
| Surface gravity (log g) | 4.28±0.14 cgs |
| Temperature | 8,124±276 K |
| Rotational velocity (v sin i) | 73[6] km/s |
| Age | 394 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
56 Cygni is a single[8] star in the northern constellation of Cygnus, located 135[1] light years from Earth. It is visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.06.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −21.5.[2] It has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.181″/yr.[9] According to Eggen (1998), this is a member of the Hyades Supercluster.[10]
This is an A-type main-sequence star with a stellar classification of A6 V.[3] Cowley et al. (1969) classified it as a Delta Delphini star,[11] which is a type of suspected Am star. The star is around 394[5] million years old with a projected rotational velocity of 73 km/s.[6] It has 1.72[5] times the mass of the Sun and is radiating 13[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,124 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.[12]
References[edit]
- ^ a b c d e f 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.
- ^ a b c d Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b 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, Bibcode:1995ApJS...99..135A, doi:10.1086/192182
- ^ a b c d 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.
- ^ a b c d 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b 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, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
- ^ "56 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-16.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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.
- ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
- ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ 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, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction