GCIRS 7
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 45m 39.987s |
| Declination | −29° 00′ 22.24″ |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | M1I |
| Apparent magnitude (J) | 14.197±0.137 |
| Apparent magnitude (H) | 9.260±0.118 |
| Apparent magnitude (K) | 6.503±0.017 |
| J−H color index | 4.937 |
| J−K color index | 7.694 |
| Details | |
| Mass | 20 – 25 M☉ |
| Radius | 1,170±60 R☉ |
| Luminosity | 189,000+42,000 −35,000 L☉ |
| Surface gravity (log g) | −0.6 cgs |
| Temperature | 3,600±195, 3,400 K |
| Metallicity [Fe/H] | −0.02 dex |
| Age | 6.5 – 10 Myr |
| Other designations | |
| GCIRS 7, 2MASS J17454004-2900225 | |
| Database references | |
| SIMBAD | data |
GCIRS 7 is a red supergiant located in the Galactic Center. It is very luminous and is one of the largest stars currently discovered, with a size about 1,170 solar radii. If placed in the Solar System, its photosphere would engulf the orbit of Jupiter.