Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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 . Stellar behaviour mostly resembles that of Mira-type pulsating giants and shows hints of molecular water layers and SiO masers in the atmosphere.

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