 V Coronae Borealis in optical light | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h 49m 31.31093s[1] |
| Declination | +39° 34′ 17.9111″[1] |
| Apparent magnitude (V) | 6.90[1] |
| Characteristics | |
| Spectral type | C6,2e(N2e)[2] |
| Astrometry | |
| Distance | 630 pc[3] |
| Details[3] | |
| Radius | 750[a] R☉ |
| Luminosity | 5300 L☉ |
| Temperature | 1800 K |
| Database references | |
| SIMBAD | data |
V Coronae Borealis (V CrB) is a Mira-type long period variable star and carbon star in the constellation Corona Borealis. Its apparent magnitude varies between 6.9 and 12.6 over a period of 357 days.[2]
V Coronae Borealis is too far from Earth for its parallax to be measured effectively. Basing on a period of 357 days, the absolute magnitude of V Coronae Borealis has been calculated to be -4.62.[5] It is estimated to be 630 pc (2,100 ly) from Earth, has a luminosity of 5,300 L☉ and a rather cool effective temperature of 1,800 K, these implying a very large radius of about 750 R☉, making V Coronae Borealis one of the largest stars so far discovered.[3] If placed in the center of the Solar System, its size would engulf all rocky planets and reach parts of the asteroid belt.
- ^ a b c "V Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 13 November 2014.
- ^ a b VSX (4 January 2010). "V Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 13 November 2014.
- ^ a b c Cite error: The named reference
Danilovich2015was invoked but never defined (see the help page). - ^ Cite error: The named reference
aavsowas invoked but never defined (see the help page). - ^ Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: 7. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. S2CID 54918450. A120.
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).