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Theta Lyrae / BD+37° 3399 / BD+37° 3398B[1][2][3] Observation data Epoch J2000.0      Equinox J2000.0 Constellation Lyra Right ascension 19h 16m 22.0951s / 19h 16m 30.069s / 19h 16m 28.7s Declination +38° 8' 1.431" / +38° 8' 35.80" / +38° 7' 1" Apparent magnitude (V) 4.347 / 9.5 / 11.0 Characteristics Spectral type K0II / K2III / ? U−B color index +1.23 / ? / ? B−V color index +1.25 / ? / ? Astrometry Radial velocity (Rv) -30.9 / ? / ? km/s Proper motion (μ) RA: -0.49 / 0.0 / ? mas/yr Dec.: 1.23 / 14.0 / ? mas/yr Parallax (π) 4.24 ± 0.49 mas Distance approx. 770 ly (approx. 240 pc) Other designations Theta Lyrae, 21 Lyrae, HR 7314, BD+37°3398, HD 180809, SAO 68065, HIP 94713, GC 26585, IDS 19129+3757, GSC 03121-02287, BD +37°3399, BD +37°3399B Theta Lyrae (θ Lyr) is a star in a trinary star system, in the constellation Lyra, approximately 770 light years away from Earth. Theta Lyrae is an orange bright giant star of the spectral type K0II, meaning it possesses a surface temperature of about 5,000 kelvins, and is many times bigger and brighter, yet cooler, than our Sun.[1] It is orbited by a subsystem composed of BD+37° 3399 and BD+37° 3399B. 10th magnitude BD+37° 3399 is a giant star with a spectral type of K2III. It is therefore almost the same temperature as Theta Lyrae, but smaller and dimmer.[2] BD+37° 3399B is an 11th magnitude star of an unknown spectral type.[3] References ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402924945&Name=*%20tet%20Lyr. Retrieved October 15, 2007.  ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402924947&Name=BD%2b37%20%203399. Retrieved October 15, 2007.  ^ a b "Simbad Query Result". Simbad. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402924946&Name=BD%2b37%20%203398B. Retrieved October 15, 2007.  v · d · eStars of Lyra Bayer α (Vega) • β (Sheliak) • γ (Sulafat) • δ¹ • δ² • ε¹, ² (Double Double) • ζ¹ • ζ² • η (Aladfar) • θ • ι • κ • λ • μ (Alathfar) • ν¹ • ν² Flamsteed 1 (κ) • 2 (μ, Alathfar) • 3 (α, Vega) • 4 (ε¹, Double Double) • 5 (ε², Double Double) • 6 (ζ¹) • 7 (ζ²) • 8 (ν¹) • 9 (ν²) • 10 (β, Sheliak) • 11 (δ¹) • 12 (δ²) • 13 • 14 (γ, Sulafat) • 15 (λ) • 16 • 17 • 18 (ι) • 19 • 20 (η, Aladfar) • 21 (θ) Nearby α (Vega) • GJ 4063 • Gliese 747 List