title: HD 170069
text: # HD 170069
  
  HD 170069 (HR 6922) is a solitary star in the southern constellation Telescopium. It has an apparent magnitude of 5.68, allowing it to be faintly seen with the naked eye. The star is located at a distance of 590 light years but is approaching closer with a heliocentric radial velocity of −18 km/s. HD 170069 was designated as Tau Telescopii (τ Telescopii) before Benjamin Apthorp Gould dropped the title.
  
  HD 170069 has a stellar classification of K2 III, indicating that it is a red giant. It has 4.08 times the mass of the Sun but has expanded to 23.69 times its girth. It radiates at 217 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,490 K, giving an orange hue. Due to its evolved state, it has a projected rotational velocity that is less than 1 km/s.
  
  