Mimosa (star): Difference between revisions
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'''Mimosa''' or '''Becrux''' (β Cru, β Crucis, [[beta (letter)|Beta]] Crucis) is the second brightest star in the [[constellation]] [[Crux]] (after [[Alpha Crucis]] or Acrux) and is one of the [[list of brightest stars|brightest stars]] in the night sky. |
'''Mimosa''' or '''Becrux''' (β Cru, β Crucis, [[beta (letter)|Beta]] Crucis) is the second brightest star in the [[constellation]] [[Crux]] (after [[Alpha Crucis]] or Acrux) and is one of the [[list of brightest stars|brightest stars]] in the night sky. |
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Beta Crucis is located approximately |
Beta Crucis is located approximately 350 [[light year]]s distant. It is a [[spectroscopic binary]] with components that are too close together to resolve with a [[telescope]]. The pair orbit each other every 5 years and are separated by about 8 [[Astronomical unit|AU]]. Beta Crucis, being of spectral type B0.5IV, is believed to be the hottest first-magnitude star. |
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Since Beta Crucis, "Becrux", is at roughly −60° [[declination]], it is only visible south of the [[Tropic of Cancer]] and did not therefore receive a traditional name, "[[Mimosa]]" being a recent name based on its color. |
Since Beta Crucis, "Becrux", is at roughly −60° [[declination]], it is only visible south of the [[Tropic of Cancer]] and did not therefore receive a traditional name, "[[Mimosa]]" being a recent name based on its color. |
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Revision as of 05:14, 25 March 2011
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 47m 43.2s |
| Declination | −59° 41' 19" |
| Apparent magnitude (V) | 1.30 |
| Characteristics | |
| Spectral type | B0.5 IV |
| U−B color index | −1.00 |
| B−V color index | −0.15 |
| Variable type | Beta Cephei |
| Astrometry | |
| Radial velocity (Rv) | +15.6 km/s |
| Proper motion (μ) | RA: −48.24 mas/yr Dec.: −12.82 mas/yr |
| Parallax (π) | 9.25 ± 0.61 mas |
| Distance | 350 ± 20 ly (108 ± 7 pc) |
| Absolute magnitude (MV) | −3.92 |
| Details | |
| Mass | 14 M☉ |
| Radius | 8 R☉ |
| Luminosity | 34,000 L☉ |
| Temperature | 28,200 K |
| Metallicity | 80% Sun |
| Age | 10 million years |
| Orbit | |
| Companion | β Cru B |
| Period (P) | 4.0 yr |
| Semi-major axis (a) | 8.0 AU″ |
| Eccentricity (e) | 0 |
| Inclination (i) | 0° |
| Longitude of the node (Ω) | 0° |
| Periastron epoch (T) | 0 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Mimosa or Becrux (β Cru, β Crucis, Beta Crucis) is the second brightest star in the constellation Crux (after Alpha Crucis or Acrux) and is one of the brightest stars in the night sky.
Beta Crucis is located approximately 350 light years distant. It is a spectroscopic binary with components that are too close together to resolve with a telescope. The pair orbit each other every 5 years and are separated by about 8 AU. Beta Crucis, being of spectral type B0.5IV, is believed to be the hottest first-magnitude star.
Since Beta Crucis, "Becrux", is at roughly −60° declination, it is only visible south of the Tropic of Cancer and did not therefore receive a traditional name, "Mimosa" being a recent name based on its color.
In Chinese, 十字架 (Shí Zì Jià), meaning Cross, refers to an asterism consisting of β Crucis, γ Crucis, α Crucis and δ Crucis.[1] Consequently, β Crucis itself is known as 十字架三 (Shí Zì Jià sān, Template:Lang-en.)[2].
External links
- "MIMOSA". Stars. Retrieved November 28, 2005.
- http://jumk.de/astronomie/big-stars/becrux.shtml
References
- ^ Template:Zh icon 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ Template:Zh icon 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
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