Upsilon Boötis
From Wikipedia, the free encyclopedia
 The position of υ Boötis |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 49m 28.64s [1] |
| Declination | +15° 47′ 52.5″ [1] |
| Apparent magnitude (V) | 4.053 |
| Characteristics | |
| Spectral type | K5.5III |
| U−B color index | 1.87 |
| B−V color index | 1.52 |
| R−I color index | 0.87 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | -5.6 km/s |
| Proper motion (μ) | RA: -94.22 ± 0.19 [1] mas/yr Dec.: 41.07 ± 0.14 [1] mas/yr |
| Parallax (π) | 12.38 ± 0.23[1] mas |
| Distance | 263 ± 5 ly (81 ± 2 pc) |
| Absolute magnitude (MV) | -0.33 |
| Details | |
| Mass | 1.11 ± 0.33 [2] M☉ |
| Radius | 0.9 R☉ |
| Luminosity | 0.4 L☉ |
| Temperature | 3,500–5,000 K |
| Rotation | < 17 km/s 0,007348 Year |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Upsilon Boötis (υ Boo, υ Boötis) is a star in the constellation Boötes.
Upsilon Boötis is an orange K-type giant with an apparent magnitude of +4.05. It is approximately 263 light years from Earth.[1]
[edit] References
- ^ a b c d e f van Leeuwen, F. (2007). "HIP 67459". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=67230. Retrieved 2010-02-14.
- ^ Stello et al. (2008). "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses". The Astrophysical Journal Letters 674 (1): L53–L56. Bibcode 2008ApJ...674L..53S. doi:10.1086/528936. http://www.iop.org/EJ/article/1538-4357/674/1/L53/22437.html.
[edit] External links
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