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The star VX Sagittarii, red supergiant. How the star would appear at nearly 40 Astronomical Units. |
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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| Constellation | Sagittarius |
| Right ascension | 18h 08m 04.0485s |
| Declination | -22° 13′ 26.614″ |
| Apparent magnitude (V) | +10.03 |
| Characteristics | |
| Spectral type | M5Ib |
| Astrometry | |
| Distance | ≈5542 ly |
| Details | |
| Mass | 7-11[1] M☉ |
| Radius | 832-1200[1] R☉ |
| Luminosity | ≈93000 L☉ |
| Temperature | 2900 K |
| Other designations | |
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V* VX Sgr, HIC 88838, OH 8.3 -1.0, [PCC93] 218, AN 271.1904, HIP 88838, RAFGL 2071, [TVH89] 250, BD-22 4575, IRAS 18050-2213, SCHB 299, [WCP90] 180502.959-221355.58, CD-22 12589, IRC -20431, SV* HV 1152, AAVSO 1802-22, GEN# +1.00165674, JP11 2930, UBV M 22627, HD 165674, 2MASS J18080404-2213266, [LFO93] 1805-22
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| Database references | |
| SIMBAD | data |
VX Sagittarii is a late-type red supergiant star (likely even a red hypergiant) located more than 1.7 kiloparsec away from Sun in the constellation of Sagittarius.
It is classed as a cool semiregular variable with a pulsational period of 732 days and spectral type varying between M5.5 (close to visual maximum) and M9.8 (at minimum light). The effective temperature spans between a minimum of 2,400 and a maximum of 3,300 kelvin degrees. Average temperature is estimated 2,900 K [2]. Stellar behaviour mostly resembles that of Mira-type pulsating giants and shows hints of molecular water layers and SiO masers in the atmosphere[3].
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