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Theta Lyrae information


Theta Lyrae
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[1] + 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 mas/yr
Dec.: 1.23 / 14.0 mas/yr
Parallax (π)4.24 ± 0.49 mas
Distanceapprox. 770 ly
(approx. 240 pc)
Absolute magnitude (MV)−2.76+0.27
−0.24
[1]
Details
θ Lyr
Radius57±7[2] R
Surface gravity (log g)1.93[1] cgs
Temperature4500[1] K
Metallicity [Fe/H]−0.01[1] dex
Rotational velocity (v sin i)3.6±1.4[1] km/s
Other designations
θ 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[3][4][5]
Database references
SIMBADdata

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, which means that it possesses a surface temperature of about 5,000 kelvins, and is many times bigger and brighter, yet cooler, than the Sun.[3]

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.[4] BD+37° 3399B is an 11th magnitude star of an unknown spectral type.[5]

  1. ^ a b c d e f Cite error: The named reference aj135_3_892 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference aj118_6_3032 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference a was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference b was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference c was invoked but never defined (see the help page).

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Theta Lyrae

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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...

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Iorio, Giuliano; Belokurov, Vasily (2021). "Chemo-kinematcs of the Gaia RR Lyrae: the halo and the disc". Monthly Notices of the Royal Astronomical Society...

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beyond 50 parsecs and giant variable stars, including Cepheids and the RR Lyrae variables. The motion of the Sun through space provides a longer baseline...

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University Press. p. 73. ISBN 978-0-521-85370-5. Horace A. Smith (2004). RR Lyrae Stars. Cambridge University Press. p. 79. ISBN 978-0-521-54817-5. M Reid;...

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{sock} (\omega ,\theta )=\left[{\frac {\cos ^{2}\left(\theta -\theta _{0}\right)}{\alpha _{0}^{2}}}+{\frac {\sin ^{2}\left(\theta -\theta _{0}\right)}{\beta...

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First Western Minister 織女一 Zhī Nǚ yī the First Star of Weaving Girl Alpha Lyrae Vega Lyra 織女 Zhī Nǚ Weaving Girl After the Qixi Festival Weaver Girl and...

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