HD 170873

Last updated
HD 170873
Telescopium constellation map.svg
Red circle.svg
Location of HD 170873 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 34m 31.11856s [1]
Declination −52° 53 29.4756 [1]
Apparent magnitude  (V)6.20±0.01 [2]
Characteristics
Spectral type K2 III [3]
B−V color index +1.27 [4]
Astrometry
Radial velocity (Rv)23.8±0.4 [5]  km/s
Proper motion (μ)RA: −16.944  mas/yr [1]
Dec.: −42.325  mas/yr [1]
Parallax (π)5.9179 ± 0.0283  mas [1]
Distance 551 ± 3  ly
(169.0 ± 0.8  pc)
Absolute magnitude  (MV)−0.31 [6]
Details
Mass 3.20±0.04 [1]   M
Radius 22.6±1.2 [7]   R
Luminosity 170±2 [1]   L
Surface gravity (log g)1.86 [8]   cgs
Temperature 4,473±122 [9]   K
Metallicity [Fe/H]−0.01 [8]   dex
Rotational velocity (v sin i)<1 [10]  km/s
Age 318+30
31
[1]   Myr
Other designations
19 G. Telescopii [11] , CD−52°8714, CPD−52°11158, GC  25324, HD  170873, HIP  91062, HR  6954, SAO  245559 [12]
Database references
SIMBAD data

HD 170873, also known as HR 6954 or rarely 19 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.20, [2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 551 light years [1] and it is currently receding with a heliocentric radial velocity of 23.8  km/s . [5] At its current distance, HD 170873's brightness is diminished by 0.39 magnitudes due to interstellar dust, [13] and it has an absolute magnitude of −0.31. [6]

HD 170873 is an evolved red giant with a stellar classification of K2 III. [3] It has 3.2 times the mass of the Sun but at the age of 318 million years, [1] it has expanded to 22.6 times the Sun's radius. [7] It radiates 170 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,473  K . [9] It has a near-solar metallicity at [Fe/H] = −0.01 [8] and spins too slowly for its projected rotational velocity to be measured accurately. [10]

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<span class="mw-page-title-main">HD 186756</span> K-type giant; Telescopium

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