HD 175740

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Template:Short description

HD 175740
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.46[1]
Characteristics
Spectral type K0III[3]
B−V Template:Engvar Script error: No such module "val".[1]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[4] km/s
Proper motion (μ) RA: −2.059[2] mas/yr
Dec.: −2.234[2] mas/yr
Parallax (π)12.2448±0.0874 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.89[1]
Details
Mass1.39[5] or 2.795[4] Template:Solar mass
RadiusScript error: No such module "val".[2] Template:Solar radius
LuminosityScript error: No such module "val".[2] Template:Solar luminosity
Surface gravity (log g)2.8[6] cgs
TemperatureScript error: No such module "val".[2] K
Metallicity [Fe/H]Script error: No such module "val".[1] dex
Rotational velocity (v sin i)4.0[6] km/s
Age4.78[5] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[7]
Database references
SIMBADdata

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HD 175740 is a single[8] star in the northern constellation of Lyra.[1] This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.46.[1] It is located at a distance of approximately 266 light years from the Sun based on parallax,[2] and has an absolute magnitude of 0.89.[1] The star is drifting closer with a radial velocity of −9.5 km/s, and is predicted to come as close as Script error: No such module "convert". in around 8 million years.[4]

This is an aging giant star with a stellar classification of K0III,[3] having evolved off the main sequence after the supply of hydrogen at its core was exhausted. It is an estimated 4.78[5] billion years old with 1.39[5] times the mass of the Sun, although Bailer-Jones et al. (2018) give a higher estimate of 2.8[4] times the Sun's mass. The elemental composition of this star has made it the first giant to be a candidate solar sibling, suggesting it may have been born in the same star cluster as the Sun.[9] It has expanded to ten[2] times the girth of the Sun and is radiating 50[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,811 K.[2]

HD 175740 has a magnitude 12.6 visual companion, located at an angular separation of Script error: No such module "val". along a position angle (PA) of 300°, as of 2013. A magnitude 11.5 companion lies at a separation of Script error: No such module "val". along a PA of 39°, as of 2014. Both were discovered by American astronomer G. W. Hough in 1887.[10]

References

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  1. ↑ a b c d e f g h Template:Cite XHIP
  2. ↑ a b c d e f g h i j k l Template:Cite DR2
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b c d Script error: No such module "citation/CS1".
  5. ↑ a b c d Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Template:Cite simbad
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Lyra

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