70 Aquilae

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Template:Short description

70 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.903[2]
Characteristics
Spectral type K4+ III Ba1,[3] K3 III,[4] or K5 II[5]
B−V Template:Engvar Script error: No such module "val".[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: +10.124[1] mas/yr
Dec.: –15.604[1] mas/yr
Parallax (π)3.4533±0.3160 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−3.05[6]
Details
MassScript error: No such module "val".[8] Template:Solar mass
Radius102[9] Template:Solar radius
Luminosity (bolometric)4,072[2] Template:Solar luminosity
Surface gravity (log g)1.9[10] cgs
Temperature3,900[2] K
Metallicity [Fe/H]Script error: No such module "val".[11] dex
Rotational velocity (v sin i)1.9[10] km/s
AgeScript error: No such module "val".[8] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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70 Aquilae, abbreviated 70 Aql, is a single[13] orange-hued star in the equatorial constellation of Aquila. 70 Aquilae is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.90.[2] The distance to 70 Aquilae, as determined from its annual parallax shift of Script error: No such module "val".,[1] is around 940 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[7]

Classification

Perkins et al. (1989) found a stellar classification of K4+ III Ba1[3] for this star, suggesting it is a K-type giant with abundance anomaly of barium.[14] Houk and Swift (1999) matched an ordinary giant with a class of K3 III.[4] Many sources[2][8][13][10][14] still use the 1991 Bright Star Catalogue classification of K5 II,[5] which instead suggests a bright giant star.

Size and temperature

The interferometry-measured angular diameter of this star, after correcting for limb darkening, is Script error: No such module "val".,[15] which, at its estimated distance, equates to a physical radius of roughly 102 times the radius of the Sun.[9] 70 Aquilae is about 63 million years old with 6 times the mass of the Sun.[8] It is radiating 4,072[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,900 K.[2]

References

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  1. ↑ a b c d e f Template:Cite DR2
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  3. ↑ a b 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 d Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1". The radius (R*) is given by:
    2⋅R*=(289.6⋅3.27⋅10−3) AU0.0046491 AU/R⨀≈204⋅R⨀
  10. ↑ a b c Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Template:Cite simbad
  13. ↑ a b Script error: No such module "citation/CS1".
  14. ↑ a b Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Aquila

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