Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium |
Right ascension | 18h 39m 14.29289s[1] |
Declination | −47° 54′ 35.1520″[1] |
Apparent magnitude (V) | 5.84±0.01[2] |
Characteristics | |
Spectral type | A7 IV/V[3] or A3 V[4] |
B−V color index | +0.23[5] |
Astrometry | |
Radial velocity (Rv) | −9±4.3[6] km/s |
Proper motion (μ) | RA: +25.426 mas/yr[1] Dec.: +13.951 mas/yr[1] |
Parallax (π) | 10.4348 ± 0.1045 mas[1] |
Distance | 313 ± 3 ly (95.8 ± 1.0 pc) |
Absolute magnitude (MV) | +0.65[7] |
Details | |
Mass | 1.73+0.37 −0.19[8] M☉ |
Radius | 3.37±0.17[9] R☉ |
Luminosity | 33.3±0.1[1] L☉ |
Surface gravity (log g) | 3.60±0.08[8] cgs |
Temperature | 7,512[10] K |
Metallicity [Fe/H] | −0.02[11] dex |
Age | 855[1] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 171819, also known as HR 6986 or rarely 22 G. Telescopii, is a solitary star[14] 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.[2] 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 −9 km/s.[6] At its current distance, HD 171819's brightness is diminished by one-quarter of a magnitude due to interstellar dust[15] and it has an absolute magnitude of +0.65.[7]
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.[3] However, astronomer William Buscombe gave it a class of A3 V,[4] 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.[1] At present it has 1.73 times the mass of the Sun[8] and a slightly enlarged radius 3.37 times that of the Sun.[9] It radiates 33.3 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,512 K.[10] HD 171819 has a near solar metallicity at [Fe/H] = −0.02.[11]
GaiaDR3
was invoked but never defined (see the help page).Tycho2000
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