Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 18h 58m 56.62241s[1] |
Declination | +32° 41′ 22.4003″[1] |
Apparent magnitude (V) | 3.24[2] |
Characteristics | |
Spectral type | B9 III[3] |
U−B color index | –0.125[4] |
B−V color index | –0.04[2] |
Astrometry | |
Radial velocity (Rv) | –21.1[5] km/s |
Proper motion (μ) | RA: –3.09[1] mas/yr Dec.: +1.11[1] mas/yr |
Parallax (π) | 5.26 ± 0.27 mas[1] |
Distance | 620 ± 30 ly (190 ± 10 pc) |
Absolute magnitude (MV) | −3.14[6] |
Details | |
Mass | 5.76[7] M☉ |
Radius | 13.28±1.15[2] R☉ |
Luminosity | 2,430[7] L☉ |
Surface gravity (log g) | 3.5±0.25[2] cgs |
Temperature | 11000±100[2] K |
Metallicity [Fe/H] | +0.15[7] dex |
Rotational velocity (v sin i) | 65[2] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Lyrae, Latinised from γ Lyrae, and formally named Sulafat /ˈsuːləfæt/,[9][10] is the second-brightest star in the northern constellation of Lyra. With an apparent visual magnitude of 3.3,[4] it is readily visible to the naked eye. Parallax measurements yield an estimated distance of 620 light-years (190 parsecs) from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.12±0.03 due to interstellar dust.[7]
aaa474_2_653
was invoked but never defined (see the help page).gordon2019
was invoked but never defined (see the help page).aj74_375
was invoked but never defined (see the help page).aaass65_2_405
was invoked but never defined (see the help page).rgcrv
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).challouf2014
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).