Eta Boötis
Binary star system in the constellation Boötes / From Wikipedia, the free encyclopedia
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Eta Boötis (η Boötis, abbreviated Eta Boo, η Boo) is a binary star in the constellation of Boötes. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 37 light-years (11 parsecs) distant from the Sun.[1] Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[8] It forms a double star with the star BD+19 2726.[9]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 13h 54m 41.07892s[1] |
Declination | +18° 23′ 51.7946″[1] |
Apparent magnitude (V) | 2.680[2] |
Characteristics | |
Spectral type | G0 IV[3] |
U−B color index | +0.207[4] |
B−V color index | +0.585[4] |
Astrometry | |
Radial velocity (Rv) | -1.6[2] km/s |
Proper motion (μ) | RA: -60.95[1] mas/yr Dec.: -356.29[1] mas/yr |
Parallax (π) | 87.75 ± 1.24 mas[1] |
Distance | 37.2 ± 0.5 ly (11.4 ± 0.2 pc) |
Absolute magnitude (MV) | 2.41[2] |
Details | |
Mass | 1.71 ± 0.05[5] M☉ |
Radius | 2.672 ± 0.028[5] R☉ |
Luminosity | 8.89 ± 0.16[5] L☉ |
Surface gravity (log g) | 3.817 ± 0.015[5] cgs |
Temperature | 6,100 ± 28[5] K |
Metallicity [Fe/H] | +0.29 ± 0.07[6] dex |
Rotational velocity (v sin i) | 11.8[7] km/s |
Age | 2.7[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
As a constituent of a double pair, Eta Boötis is also designated WDS J13547+1824A, with its two components being designated Aa (formally named Muphrid /ˈmjuːfrɪd/, the traditional name for the entire system)[10] and Ab. (As part of a binary pair, they are also designated Eta Boötis A and B, respectively.) BD +19 2726 is also designated WDS J13547+1824B.[9]