Wikiwand AI

HD 165189 and HD 165190

Star in the constellation Corona Australis From Wikipedia, the free encyclopedia

HD 165189 and HD 165190 are components of a visual binary star[10] system located 143 light years away in the southern constellation of Corona Australis. It is visible to the naked eye with the primary having an apparent visual magnitude of 4.929±0.025. The system is a member of the Beta Pictoris Moving Group.[14]

ConstellationCorona Australis[1]
Right ascension18h 06m 49.89293s[2]
Declination−43° 25′ 30.8009″[2]
Apparentmagnitude(V)5.62±0.01[3]
Quick facts Constellation, Right ascension ...
HD 165189 and HD 165190
Observation data
Epoch J2000      Equinox ICRS
Constellation Corona Australis[1]
HD 165189
Right ascension 18h 06m 49.89293s[2]
Declination −43° 25′ 30.8009″[2]
Apparent magnitude (V) 5.62±0.01[3]
HD 165190
Right ascension 18h 06m 49.91494s[4]
Declination −43° 25′ 29.0976″[4]
Apparent magnitude (V) 5.68±0.01[3]
Characteristics
HD 165189
Evolutionary stage main sequence[2]
Spectral type A6 V[5]
B−V color index +0.230[6]
HD 165190
Evolutionary stage main sequence[4]
Spectral type A7 V[5]
B−V color index +0.262[6]
Astrometry
Radial velocity (Rv)−7.8±0.4[7] km/s
Absolute magnitude (MV)+1.81[1]
HD 165189
Proper motion (μ) RA: +10.915 mas/yr[2]
Dec.: −105.835 mas/yr[2]
Parallax (π)22.7417±0.1025 mas[2]
Distance143.4 ± 0.6 ly
(44.0 ± 0.2 pc)
HD 165190
Proper motion (μ) RA: −1.187 mas/yr[4]
Dec.: −101.243 mas/yr[4]
Parallax (π)22.6753±0.071 mas[4]
Distance143.8 ± 0.5 ly
(44.1 ± 0.1 pc)
Orbit[8][9]
Period (P)607±245 yr
Semi-major axis (a)4.63±1.83″
Eccentricity (e)0.896±0.068
Inclination (i)104±6°
Longitude of the node (Ω)84.2±5.5°
Periastron epoch (T)1854.7
Argument of periastron (ω)
(secondary)		282±9°
Details
HD 165189
Mass1.59[10] M☉
Radius1.7[2] R☉
Luminosity8.6[2] L☉
Surface gravity (log g)4.25[11] cgs
Temperature7,600[2] K
Metallicity [Fe/H]−0.25[11] dex
Rotational velocity (v sin i)130±1[12] km/s
HD 165190
Mass1.58[10] M☉
Radius1.7[4] R☉
Luminosity8.2[4] L☉
Surface gravity (log g)4.15[11] cgs
Temperature7,566[4] K
Metallicity [Fe/H]−0.24[11] dex
Rotational velocity (v sin i)129±1[12] km/s
Age813[4] Myr
Other designations
1 G. Coroane Australis, CD−43°12272, GC 24649, HIP 88726, CCDM J18068-4325, WDS J18068-4325[13]
HD 165189: HR 6749
HD 165190: HR 6750
Database references
SIMBADdata
HD 165189
HD 165190
Close

The pair orbit each other with a period of 450 years and a large eccentricity of 0.650.[9] They have a projected separation of 70.1 AU.[10] Both components are A-type main-sequence stars; the primary has a stellar classification of A6 V while the secondary is A7 V.[14] They have similar masses of 1.59 and 1.58 times the mass of the Sun, respectively.[10]

References

Related Articles

Timelines

Top Qs

Fact Checks