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Star in the constellation of Telescopium From Wikipedia, the free encyclopedia
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]
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] |
Distance | 357 ± 1 ly (109.6 ± 0.4 pc) |
Absolute magnitude (MV) | +1.10[7] |
Details | |
Mass | 1.19+0.16 −0.29[8] M☉ |
Radius | 9.9±0.5[9] R☉ |
Luminosity | 43.6±1.0[10] L☉ |
Surface gravity (log g) | 2.46+0.09 −0.10[8] cgs |
Temperature | 4,742±49[10] K |
Metallicity [Fe/H] | −0.11±0.03[10] dex |
Rotational velocity (v sin i) | <1[11] km/s |
Age | 4.83+2.53 −3.22[8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]
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