Epsilon Boötis
🌏SPACE FIELD 춘식최 2024 April 5 🌏Double star in Boötes / From Wikipedia, the free encyclopedia
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This article is about Izar. It is not to be confused with Mizar.
Epsilon Boötis (ε Boötis, abbreviated Epsilon Boo, ε Boo), officially named Izar (/ˈaɪzɑːr/ EYE-zar),[16] is a binary star in the northern constellation of Boötes. The star system can be viewed with the unaided eye at night, but resolving the pair with a small telescope is challenging; an aperture of 76 mm (3.0 in) or greater is required.[17]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 44m 59.22s[1] |
Declination | +27° 04′ 27.2″[1] |
Apparent magnitude (V) | 2.37[2]/5.12[3] |
Characteristics | |
Spectral type | K0 II-III[4] + A2 V[5] |
U−B color index | +0.73[2] |
B−V color index | +0.97[2] |
Astrometry | |
Radial velocity (Rv) | −16.31[6] km/s |
Proper motion (μ) | RA: −50.95[1] mas/yr Dec.: +21.07[1] mas/yr |
Parallax (π) | 13.8267 ± 0.4896 mas[7] |
Distance | 236 ± 8 ly (72 ± 3 pc) |
Absolute magnitude (MV) | −1.61[8] |
Details | |
A | |
Mass | 4.6[9] M☉ |
Radius | 33[6] R☉ |
Luminosity | 501[6] L☉ |
Surface gravity (log g) | 2.2[6] cgs |
Temperature | 4,550[6] K |
Metallicity | –0.13[6] |
Metallicity [Fe/H] | –0.20[10] dex |
Rotational velocity (v sin i) | 10.9[6] km/s |
Age | 37.4 ± 4.2[11] Myr |
B | |
Mass | 2.27[12] M☉ |
Radius | 2.7[12] R☉ |
Luminosity | 44.8[12] L☉ |
Surface gravity (log g) | 3.9[12] cgs |
Temperature | 9,009[12] K |
Rotational velocity (v sin i) | 123[13] km/s |
Other designations | |
A: Izar, HD 129989, HR 5506, SAO 83500[15] | |
B: HD 129988, HR 5505[3] | |
Database references | |
SIMBAD | Epsilon Boo A |
Epsilon Boo B |
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