HD 187923

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Template:Short description

HD 187923
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.148[3]
Characteristics
Spectral type G0 V[4]
U−B Template:Engvar +0.12[5]
B−V Template:Engvar +0.65[5]
Variable type suspected[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: −344.185[2] mas/yr
Dec.: -334.608[2] mas/yr
Parallax (π)37.0427±0.0529 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)3.94[3]
Details[7]
MassScript error: No such module "val". or 1.02[8] Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
LuminosityScript error: No such module "val". Template:Solar luminosity
Surface gravity (log g)4.23 cgs
Temperature5,774 K
Metallicity [Fe/H]−0.11 dex
Rotational velocity (v sin i)0.1 km/s
AgeScript error: No such module "val". or 10.2[8] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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HD 187923 is a suspected variable star[6] in the equatorial constellation of Aquila. It is a dim star that is just visible to the naked eye, having an apparent visual magnitude of 6.148.[3] Based upon an annual parallax shift of Script error: No such module "val".,[2] it is located 88 light years away. The star is moving closer to the Earth with a heliocentric radial velocity of −20.7 km/s.[3] It has a relatively high proper motion, traversing the celestial sphere at the rate of Script error: No such module "val". per year.[10]

This is an ordinary G-type main-sequence star with a stellar classification of G0 V.[4] It has some similarities to the Sun, and thus is considered a solar analog.[11] Brewer et al. (2016) estimate the star has 1.3 times the mass of the Sun and 1.44 times the Sun's radius. It is thought to be around 9 billion years old and is spinning slowly with a projected rotational velocity of 0.1 km/s. The star is radiating double the Sun's luminosity from its photosphere at an effective temperature of 5,774 K.[7] Casagrande et al. (2011) gave a much lower mass estimate of 1.02 times the Sun's mass with an age of around 10.2 billion years.[8]

References

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

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External links

Template:Stars of Aquila

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