title: HD 179886
text: # HD 179886
  
  HD 179886 (HR 7289) is a binary star located in the southern constellation Telescopium. It has a combined apparent magnitude of 5.37, making it faintly visible to the naked eye if viewed under ideal conditions. The system is situated at a distance of 700 light years but is receding with a heliocentric radial velocity of 6.3 km/s.
  
  As of 2018, the two stars have a separation of 0.4 arcseconds along a position angle of 205°
  
  The brighter component has a stellar classification of K3 III, indicating that the object is an ageing K-type giant. Models show it to be on the red giant branch, a stage of stellar evolution where the star is fusing hydrogen in a shell around an inert core of helium. It has an angular diameter of 1.95±0.03, yielding a diameter 37 times that of the Sun at its estimated distance. At present it has 111% the mass of the Sun and radiates at 365 $L_☉$ from its enlarged photosphere at an effective temperature of 4,622 K, giving it an orange glow. HD 179886A has a metallicity 141% that of the Sun and spins modestly with a projected rotational velocity of 2.4 km/s.
  
  