Ross 156 is a faint dwarfstar emitting only a tenth of the light of the Sun, and only about a third of the Sun'sdiameter. It is notable for its high proper motion relative to its background stars, with its position in the sky changing by more than three hundred milli-arcseconds each year.
Faint Ross 156 shares a field of view with two much brighterorangestars, Nu1Sagittarii (named Ainalrami) to the southwest, and Nu2Sagittarii to the southeast. Both of these stars are much more distant than the tiny dwarf Ross 156, but also much more luminous (in particular, Ainalrami is more than ten times as distant from Earth as Ross 156, but is a supergiant shining more than 12,000 times as strongly). The star-like object immediately to the south of Nu2Sagittarii is more distant still, and is in fact the globular clusterNGC 6717, some 23,000 light years from the Sun in the central regions of the Galaxy. Imagery provided by Aladin sky atlas
Show on Sky Map