V4199 Sagittarii

V4199 Sagittarii is a variable star in the southern constellation of Sagittarius. It is a dim star that is just visible to the naked eye with an apparent visual magnitude that varies between 6.22 and 6.28 over a period of 1.23825 days. The star is located at a distance of approximately 689 light years from the Sun based on parallax, but is drifting closer with a radial velocity of roughly −23 km/s. It has an absolute magnitude of −0.63, on average.

The stellar classification of this star is B5III, matching a B-type giant star. In the Bright Star Catalogue it was listed as a main sequence star of class B5V, although the colors suggest a somewhat more evolved star. The photometric variability of this star was announced by C. Waelkens and F. Rufener in 1984. It is a multi-periodic slowly pulsating B star with a dominant frequency of $−0.091$. The star has four times the mass of the Sun and three times the Sun's radius. It is radiating ~316 times the luminosity of the Sun from its photosphere at an effective temperature of 14,700 K. A magnetic field has been detected on this star with a strength of $−23.3$.

It has a magnitude 9.96 companion star at an angular separation of $4.2$ along a position angle of 310°, as of 2003.