V354 Cephei
V354 Cephei is a supergiant star in the constellation of Cepheus.[4] It is one of the largest stars known, thought to have a radius over 1,500 times greater than the Sun's. This would mean the star's outer layers extend significantly beyond Saturn if it replaced the Sun.[5] While it has one of the largest radii of any star known, it has a more modest mass estimated at 25 solar masses.[5] Its luminosity is estimated to be 300, times greater than Sol's. A medium sized (4.5 - 6.0 inches) telescope is required to observe the star as although large, it appears faint in the night sky.
| V354 Cephei | |
|---|---|
| Observational Data | |
| Designation | IRAS 22317+5838 |
| Right ascension | 22h 33m 34.6349s[1][2] |
| Declination | +58° 52â² 47.1259â³[1][2] |
| Constellation | Cepheus |
| Type of object | Supergiant |
| Magnitude | Apparent Mag: +10.42[3] |
| Astrometry | |
| Distance from Earth | 9,000 ly[3] |
| Radial velocity | -59.42 ± 0.28 km/s[1][2] |
| Proper motion | RA: -2.816 mas/yr[1][2] Dec: -2.510 mas/yr[1][2] |
| Parallax | 0.4581 ± 0.1023 mas[1][2] |
V354 Cephei is located 9,000 light years from Earth meaning it shines with an apparent magnitude of +10.42.[3] The star is known to be a variable star with its magnitude varying by around 0.5.[6][7] The star's period is not known, it may be an irregular variable.
See also
References
- â 1.0 1.1 1.2 1.3 1.4 1.5 V354 Cephei. Simbad Astronomical Database. simbad.u-strasbg.fr. Retrieved on July 06, 2020.
- â 2.0 2.1 2.2 2.3 2.4 2.5 Gaia Collaboration (2018). "VizieR Online Data Catalog: Gaia DR2". VizieR Online Data Catalog I/345: I/345. Bibcode:Â 2018yCat.1345....0G. arXiv:0708.1752
- â 3.0 3.1 3.2 V354 Cephei. universeguide. Retrieved on July 06, 2020.
- â Janet Mason (Janurary 16, 2020). The largest stars in the Universe (that weâve found so far). zemscience.com. Retrieved on July 06, 2020.
- â 5.0 5.1 Fraser Cain (January 11, 2005). Three Largest Stars Discovered. universetoday.com. Retrieved on July 06, 2020.
- â IRAS 22317+5838. General Catalogue of Variable Stars. sai.msu.su. Retrieved on July 06, 2020.
- â Abramian, G. B. (1980). "New Variable M Supergiant Stars". Communications of the Byurakan Astrophysical Observatory (ComBAO) 52: 13-23. Bibcode:Â 1980SoByu..52...13A.