V4381 Sagittarii

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V4381 Sagittarii
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 08m 38.58558s[1]
Declination −21° 26′ 58.4136″[1]
Apparent magnitude (V) 6.538[2] (6.57p - 6.62p[3])
Characteristics
Evolutionary stage Supergiant[2]
Spectral type A2/A3Iab[2]
U−B color index +0.279[2]
B−V color index −+0.856[2]
Variable type α Cyg[3]
Astrometry
Radial velocity (Rv) −16[4] km/s
Proper motion (μ) RA: −1.65[1] mas/yr
Dec.: −1.05[1] mas/yr
Parallax (π) 2.25 ± 0.55[1] mas
Distance approx. 1,400 ly
(approx. 400 pc)
Absolute magnitude (MV) −6.6[5]
Details[2]
Mass 7.00[6] M☉
Luminosity 39,000 L☉
Surface gravity (log g) 1.50 cgs
Temperature 9,000 K
Rotational velocity (v sin i) 18 km/s
Other designations
V4381 Sagittarii, HD 165784, HIP 48766, BD−21°4866, 2MASS J18083858-2126584
Database references
SIMBAD data

V4381 Sagittarii is a variable star in the constellation Sagittarius. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent magnitudes 6.57 and 6.62.

References

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