GCIRS 7

GCIRS 7 is a red supergiant located in the Galactic Center. It is very bright and is one of the largest stars currently discovered, with a size about 1,170 solar radii.^[3] If placed in the Solar System, its photosphere would engulf the orbit of Jupiter.

GCIRS 7

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Sagittarius
Right ascension	17h 45m 39.987s[1]
Declination	−29° 00′ 22.24″[1]
Characteristics
Evolutionary stage	Red supergiant
Spectral type	M1I[2]
Apparent magnitude (J)	14.197±0.137[1]
Apparent magnitude (H)	9.260±0.118[1]
Apparent magnitude (K)	6.503±0.017[1]
J−H color index	4.937[citation needed]
J−K color index	7.694[citation needed]
Details
Mass	20 – 25[3] M☉
Radius	1,170±60[3] R☉
Luminosity	189,000+42,000 −35,000[2] L☉
Surface gravity (log g)	−0.6[4] cgs
Temperature	3,600±195,[2] 3,400[5] K
Metallicity [Fe/H]	−0.02[4] dex
Age	6.5 – 10[2] Myr
Other designations
GCIRS 7, 2MASS J17454004-2900225[1]
Database references
SIMBAD	data

See also

• KW Sagittarii, another red supergiant in Sagittarius
• VX Sagittarii, another red supergiant (or possible super-AGB star) in Sagittarius