Iota Boötis
Binary star system in the northern constellation of Boötes / From Wikipedia, the free encyclopedia
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Iota Boötis (ι Boo, ι Boötis) is a member of a binary star system in the constellation Boötes, approximately 96 light-years from Earth. It has the traditional name Asellus Secundus /əˈsɛləs sɪˈkʌndəs/ (Latin for "second donkey colt") and the Flamsteed designation 21 Boötis. The companion is HD 234121, a K0 main sequence star.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 16m 09.92976s[1] |
Declination | +51° 22′ 02.0287″[1] |
Apparent magnitude (V) | 4.75[2] (4.73 – 4.78[3]) |
Characteristics | |
Spectral type | A7 V[4] |
U−B color index | +0.06[5] |
B−V color index | +0.20[5] |
R−I color index | +0.09[5] |
Variable type | Delta Scuti variable[3] |
Astrometry | |
Radial velocity (Rv) | −18.7[6] km/s |
Proper motion (μ) | RA: −149.277[1] mas/yr Dec.: +89.135[1] mas/yr |
Parallax (π) | 33.8856 ± 0.0820 mas[1] |
Distance | 96.3 ± 0.2 ly (29.51 ± 0.07 pc) |
Absolute magnitude (MV) | +2.38[7] |
Details | |
Mass | 1.81[4] M☉ |
Radius | 1.7[1] R☉ |
Luminosity | 8.8[1] L☉ |
Surface gravity (log g) | 4.14[1] cgs |
Temperature | 7,764[1] K |
Metallicity [Fe/H] | +0.19[8] dex |
Rotational velocity (v sin i) | 144[9] km/s |
Age | 785[1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Data sources: | |
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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