HD 189080

HD 189080
Location of HD 189080 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 20h 00m 25.32793s[1]
Declination −49° 21′ 03.4019″[1]
Apparent magnitude (V) 6.18±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K0 III[4]
U−B color index +0.92[5]
B−V color index +1.06[5]
Astrometry
Radial velocity (Rv)66.9±0.4[6] km/s
Proper motion (μ) RA: −77.932 mas/yr[1]
Dec.: −2.298 mas/yr[1]
Parallax (π)9.1277 ± 0.0321 mas[1]
Distance357 ± 1 ly
(109.6 ± 0.4 pc)
Absolute magnitude (MV)+1.10[7]
Details
Mass1.19+0.16
−0.29[8] M☉
Radius9.9±0.5[9] R☉
Luminosity43.6±1.0[10] L☉
Surface gravity (log g)2.46+0.09
−0.10[8] cgs
Temperature4,742±49[10] K
Metallicity [Fe/H]−0.11±0.03[10] dex
Rotational velocity (v sin i)<1[11] km/s
Age4.83+2.53
−3.22[8] Gyr
Other designations
74 G. Telescopii[12], CD−49°12949, CPD−49°11118, FK5 3595, GC 27678, HD 189080, HIP 98482, HR 7621, SAO 229973[13]
Database references
SIMBADdata

HD 189080, also known as HR 7621 or rarely 74 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.18,[2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place it at a distance of 357 light years [1] and it is currently receding rapidly with a heliocentric radial velocity of 66.9 km/s.[6] At its current distance, HD 189080's brightness is diminished by 0.17 magnitudes due to extinction from interstellar dust.[14] It has an absolute magnitude of +1.1.[7]

This is an evolved red giant with a stellar classification of K0 III.[4] It is currently on the red giant branch,[3] fusing a hydrogen shell around an inert helium core. It has 119% the mass of the Sun, but at the age of 4.83 billion years[8] it has expanded to 9.9 times the radius of the Sun.[9] It radiates 43.6 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,742 K.[10] HD 189080 is slightly metal deficient with [Fe/H] = −0.11[10] and spins too slowly to be measured accurately.[11]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Jones2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Oja1970 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Soto2021 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).