Difference between revisions of "KY Cygni"
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Revision as of 19:29, July 28, 2020
| KY Cygni | |
|---|---|
| Observational Data | |
| Designation | KY Cyg |
| Right ascension | 20h 25m 58.0435s[1][2] |
| Declination | +38° 21′ 07.6752″[1][2] |
| Constellation | Cygnus |
| Type of object | Supergiant star |
| Magnitude | Apparent Mag: +11.14[3] Absolute Mag: +0.13[4] |
| Astrometry | |
| Distance from Earth | 5,200 ly[5] |
| Proper motion | RA: -3.574 mas/yr[1][2] Dec: -6.279 mas/yr[1][2] |
| Parallax | 0.9151 ± 0.0920 mas[1][2] |
KY Cygni (KY Cyg) is a supergiant star in the constellation of Cygnus and one of the largest stars known.[5] The star is thought to have a radius 1,420 times larger than the Sun's making it slightly smaller than the radius of the largest star known, UY Scuti, at 1,700 solar radii.[6][7] The star has a surface temperature of 3,500 kelvin, a little cooler than Sol, but the enormous radius means it outputs over 300,000 times more energy than the Sun.[8]
It is situated roughly 5,200 light years away from Earth. This large distance means that is shines at only the eleventh (some sources place it higher at ~14) magnitude, fair too dim to be observed with the unaided eye; a telescope is required for observation. The two letters at the start of the star's name indicate star has been identified as a variable star, meaning its apparent brightness changes over time.[3] Specifically, it hase been classified as an irregular variable and its brightness varies by about two magnitudes.[9][10] As an irregular variable star, it does not vary in brightness with any discernable period.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 KY Cygni. Simbad Astronomical Database. simbad.u-strasbg.fr. Retrieved on July 28, 2020.
- ↑ 2.0 2.1 2.2 2.3 2.4 Gaia Collaboration (2018). "VizieR Online Data Catalog: Gaia DR2". VizieR Online Data Catalog I/345: I/345. Bibcode: 2018yCat.1345....0G. arXiv:0708.1752
- ↑ 3.0 3.1 KY Cygni (Supergiant Star) Star Facts. universeguide.com. Retrieved on July 28, 2020.
- ↑ Computed using definition of absolute magnitude with an apparent magnitude of +11.14 and distance of 5,200 light years.
- ↑ 5.0 5.1 Janet Mason (January 11, 2005). Three Largest Stars Discovered. universetoday.com. Retrieved on July 28, 2020.
- ↑ Nola Taylor Redd (July 26, 2018). What Is the Biggest Star?. space.com. Retrieved on July 28, 2020.
- ↑ A couple of estimations put KY Cygni's radius at 2,850 solar radii, but these are generally thought to be dubious to observational error (see space.com reference).
- ↑ KY Cygni. enacademic.com. Retrieved on July 28, 2020.
- ↑ Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V. et al. (2017). "General Catalogue of Variable Stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80-88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ KY Cygni. sai.msu.su. Retrieved on July 28, 2020.