theta Lyrae

{{Short description|Star in a trinary star system in the constellation Lyra}}

{{Starbox begin

| name=Theta Lyrae

}}

{{Starbox observe

| epoch=J2000.0

| constell=Lyra

| ra={{RA|19|16|22.0951}}

| dec={{Dec|+38|08|1.431}}

| appmag_v=4.38

}}

{{Starbox character

| class=K0II

| b-v=+1.26

| u-b=+1.23

}}

{{Starbox astrometry

| radial_v={{val|-31.05|0.14}}

| prop_mo_ra={{val|-2.864}}

| prop_mo_dec={{val|4.114}}

| pm_footnote=

| parallax=4.2005

| p_error=0.1053

| parallax_footnote={{Cite Gaia DR3|2099385000742174592}}

| dist_pc={{val|237.9|6.7|6.2}}

| dist_ly={{val|755.9|21.9|20.2}}

| dist_footnote=

| absmag_v = {{val|-2.76|+0.27|-0.24}}

}}

{{Starbox detail

| mass =

| radius = {{val|60.31|1.92|2.99}}

| luminosity = {{val|1374|43|fmt=commas}}

| temperature = {{val|4523|44|fmt=commas}}

| gravity = 1.93

| metal_fe = −0.01

| rotational_velocity = {{val|3.6|1.4}}

| age_gyr =

}}

{{Starbox catalog

| names=θ Lyrae, 21 Lyrae, HR 7314, BD+37°3398, HD 180809, SAO 68065, HIP 94713, GC 26585, IDS 19129+3757, GSC 03121-02287 }}

{{Starbox reference

|Simbad=tet+Lyr

}}

Theta Lyrae (θ Lyr) is a red giant star in the constellation Lyra, approximately 760 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 K, and is many times bigger and brighter, yet cooler, than the Sun.

BD+37°3399 and BD+37°3399B are respectively 10th- and 11th-magnitude companions, although not at the same distance. BD+37°3399 is a giant star with a spectral type of K2III. It is therefore almost the same temperature as Theta Lyrae. BD+37° 3399B is an 11th magnitude star of an unknown spectral type.

References

{{reflist|refs=

{{cite journal | display-authors=1 | last1=Carney | first1=Bruce W. | last2=Gray | first2=David F. | last3=Yong | first3=David | last4=Latham | first4=David W. | last5=Manset | first5=Nadine | last6=Zelman | first6=Rachel | last7=Laird | first7=John B. | title=Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars | journal=The Astronomical Journal | volume=135 | issue=3 | pages=892–906 |date=March 2008 | doi=10.1088/0004-6256/135/3/892 | bibcode=2008AJ....135..892C |arxiv = 0711.4984 | s2cid=2756572 }}

{{cite simbad | title= BD+37 3399 | accessdate=October 15, 2007 }}

{{cite simbad | title=Simbad Query Result | work=Simbad | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%402924946&Name=BD%2b37%20%203398B | accessdate=October 15, 2007 }}

{{cite journal |bibcode=2002yCat.2237....0D |title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system |last1=Ducati |first1=J. R. |journal=Vizier Online Data Catalog |date=2002 |volume=2237 }}

{{Cite journal |last1=Baines |first1=Ellyn K. |last2=Clark |first2=((James H., III)) |last3=Schmitt |first3=Henrique R. |last4=Stone |first4=Jordan M. |last5=von Braun |first5=Kaspar |date=2023-12-01 |title=33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble |journal=The Astronomical Journal |volume=166 |issue=6 |pages=268 |doi=10.3847/1538-3881/ad08be |doi-access=free |bibcode=2023AJ....166..268B |issn=0004-6256}}

{{Cite journal|last1=Bailer-Jones|first1=C. A. L.|last2=Rybizki|first2=J.|last3=Fouesneau|first3=M.|last4=Demleitner|first4=M.|last5=Andrae|first5=R.|bibcode=2021AJ....161..147B|title=Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3|journal=The Astronomical Journal|year=2021|volume=161|issue=3|page=147|doi=10.3847/1538-3881/abd806|arxiv=2012.05220|s2cid=228063812 |doi-access=free }} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].

}}

Category:Triple star systems

Category:K-type bright giants

Category:K-type giants