Star in the constellation Telescopium
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0      Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | B−V 
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HD 171819, also known as HR 6986 or rarely "22 G. Telescopii", is a solitary star located in the southern constellation Telescopium. It is faintly visible to the naked eye as a white-hued object with an apparent magnitude of 5.84. The object is located relatively close at a distance of 313 light years based on Gaia DR3 parallax measurements, but it is approaching the Solar System with a heliocentric radial velocity of . At its current distance, HD 171819's brightness is diminished by one-quarter of a magnitude due to interstellar dust and it has an absolute magnitude of +0.65.
HD 171819 has a stellar classification of A7 IV/V, indicating that the object is a late A-type star with the blended luminosity class of a main sequence star and subgiant. However, astronomer William Buscombe gave it a class of A3 V, instead making it an ordinary A-type main-sequence star. Evolutionary models give it an age of 855 million years and place it towards the end of its main-sequence life. At present it has 1.73 times the mass of the Sun and a slightly enlarged radius 3.37 times that of the Sun. It radiates 33.3 times the luminosity of the Sun from its photosphere at an effective temperature of . HD 171819 has a near solar metallicity at [Fe/H] = −0.02.
References.
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