V1216 Sagittarii, HIP 92403 - Ross 154

Ross 154 (V1216 Sgr) is the seventh closest star to our Sun, lying at about 9.68 light-years away. It is located in the eastern part of Sagittarius, the Archer, northeast of Kaus Borealis (λ Sagittarii). It is the nearest star in Sagittarius. However, at 11th magnitude, Ross 154 is much too faint to be viewed with the naked eye, and requires a telescope of at least 65 mm aperture to be seen under ideal conditions. It was discovered in 1925 by Frank Elmore Ross, who first reported on this star in his "Second List of New Proper-Motion Stars". Its nearest neighbor in space is Barnard's star, located 5.41 light years away.

Ross 154 is a cool, dim, main-sequence red dwarf of spectral class M3.5 Ve. It has around 17% of the Sun's mass, 24% of its diameter, and less than 1/2,000th of its luminosity. It is a UV Ceti-type flare star, with the variable star designation V1216 Sagittarii. Typically, it will brighten by 3 to 4 magnitudes during a flare, with a mean time of about two days between major flares. Based on its relatively rapid rotation, Ross 154 is probably a young star, with an estimated age of less than a billion years. Its abundance of elements heavier than helium is about half of the Sun's. It has a strong magnetic field and is an X-ray source; X-ray flare emissions from Ross 154 have been observed by the Chandra satellite.

Ross 154 has not been identified as a member of any specific stellar moving group. It has a nearly circular orbit around the center of Milky Way galaxy, with an eccentricity of only 0.052. Based on its low velocity relative to the Sun, Ross 154 is believed to be a young "Population I" disk star. It will make its closest approach to the Sun in 150,000 years, when it comes within 6.13 light years.

No low-mass companions have yet been detected in orbit around Ross 154.