Iota Lyrae

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Template:Short description

Iota Lyrae
File:IotaLyrLightCurve.png
A light curve for Iota Lyrae, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.22[3]
Characteristics
Spectral type B6IV[4]
Variable type Be star[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: −1.437[2] mas/yr
Dec.: −3.876[2] mas/yr
Parallax (π)3.5858±0.1924 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.94[7]
Orbit[8]
Period (P)216.93 yr
Semi-major axis (a)0.172″
Eccentricity (e)0.637
Inclination (i)145.5°
Longitude of the node (Ω)171.4°
Periastron epoch (T)B 1997.28
Argument of periastron (ω)
(secondary)		201.2°
Details
Mass5.2[9] Template:Solar mass
Radius6.7[10] Template:Solar radius
Luminosity854[10] Template:Solar luminosity
Surface gravity (log g)3.54[9] cgs
Temperature12,059[10] K
Metallicity [Fe/H]−0.11[9] dex
Rotational velocity (v sin i)224[11] km/s
Age168[12] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[13]
Database references
SIMBADdata

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ι Lyrae, Latinised as Iota Lyrae, is a binary star[3] in the northern constellation of Lyra. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude that fluctuates around 5.22.[3] This object is located approximately 910 light years distant from the Sun based on parallax, but is drifting nearer with a radial velocity of −26 km/s.[6]

This is a wide binary system with a computed orbital period of 217 years and an eccentricity of 0.6.[8] The primary component has a stellar classification of B6IV,[4] matching a B-type subgiant star. It is a Be star,[14] displaying emission lines in its spectrum, and is spinning rapidly with a projected rotational velocity of Script error: No such module "val"..[11] The star ranges in brightness from magnitude 5.20 down to 5.27.[5] It has about five times the mass of the Sun and is radiating 854 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..

References

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  2. ↑ a b c d e Template:Cite DR2
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  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. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Template:Cite simbad
  14. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Lyra

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