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 | |
Database references | |
SIMBAD | data |
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.
SIMBAD
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