HD 157661

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Template:Short description

HD 157661
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[1]
HD 157661
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.70/6.46[3]
HD 157649
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 7.11[5]
Characteristics
HD 157661
Spectral type B7V + B9.5V[3]
U−B Template:Engvar −0.34[6]
B−V Template:Engvar −0.07[6]
HD 157649
Spectral type B9.5V[7]
Astrometry
HD 157661
Radial velocity (Rv)+8[8] km/s
Proper motion (μ) RA: −6.46[2] mas/yr
Dec.: −27.91[2] mas/yr
Parallax (π)5.13±0.72 mas[2]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Absolute magnitude (MV)−1.12[1]
HD 157649
Proper motion (μ) RA: −5.818[4] mas/yr
Dec.: −28.942[4] mas/yr
Parallax (π)5.2246±0.0657 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
A
Mass3.03[9] Template:Solar mass
Radius4.49[9] Template:Solar radius
Luminosity317[9] Template:Solar luminosity
Surface gravity (log g)3.61[9] cgs
Temperature11,493[9] K
B
Mass3.31[10] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
HD 157649
Mass2.65[4] Template:Solar mass
Radius2.88[4] Template:Solar radius
Luminosity69[4] Template:Solar luminosity
Surface gravity (log g)3.85[4] cgs
Temperature10,189[4] K
Rotation27.152 days[11]
Age327[4] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
HD 157661: CD−45 11531, HD 157661, HIP 85389, HR 6477[12]
HD 157649: CD−45 11527, HD 157649
Database references
SIMBADdata
A
B
HD 157649

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HD 157661 is the Henry Draper Catalogue designation for a likely triple star[3] in the southern constellation of Ara. With a measured annual parallax of 5.13 mas,[2] is located at a distance of approximately Script error: No such module "convert". from Earth. The combined apparent visual magnitude of the stars is 5.29,[6] which means it is faintly visible to the naked eye.

The inner components of this system consist of a pair of B-type main sequence stars. The brighter star has a magnitude of 5.70 and a stellar classification of B7 V. At an angular separation of 2.115 arcseconds is the magnitude 6.46 secondary component, which has a classification of B9.5 V. The third member of the system is HD 157649, a 7.6 magnitude A-type star at a separation of 103 arcseconds.[3]

References

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  1. ↑ a b Template:Cite XHIP
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  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b c d e f g h i j k Template:Cite Gaia DR3
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  6. ↑ a b c Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c d e Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Template:Cite simbad

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External links

  • VizieR Detailed Page: HR 6477 Hoffleit, D., Warren, Jr., W. H., (1991). The Bright Star Catalogue, (5th Revised Ed), CDS.
  • VizieR Detailed Page: CCDM 17268-4550 Dommanget J., (2002) Catalog of Components of Double & Multiple stars, CDS.
  • Aladin previewer: Image of SV* ZI 1312

Template:Stars of Ara

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