:12 Boötis

{{about-distinguish|d Boötis|delta Boötis{{!}}δ Boötis}}

{{Short description|Binary in the constellation Boötes}}

{{Starbox begin}}

{{Starbox image

|image=

{{Location mark

|image=Boötes constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=12 Boötis

|x=754|y=954

}}

|caption=Location of 12 Boötis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Boötes

| ra = {{RA|14|10|23.93342}}{{cite journal | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | last1=Van Leeuwen | first1=F. | s2cid=18759600 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2069226 Vizier catalog entry]

| dec = {{DEC|+25|05|30.0394}}

| appmag_v = 4.83{{cite journal |bibcode=2002yCat.2237....0D |title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system |journal=CDS/ADC Collection of Electronic Catalogues |volume=2237 |last1=Ducati |first1=J. R. |year=2002 }}

}}

{{Starbox character

| class = F9IVw

| b-v = +0.54

| u-b = +0.07

}}

{{Starbox astrometry

| radial_v = {{val|+9.646|0.013}}

| prop_mo_ra = −23.43

| prop_mo_dec = −59.79

| parallax = 27.917

| p_error = 0.044

| parallax_footnote =

| absmag_v = 2.00

}}

{{Starbox orbit

|reference={{cite journal|title=High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027|author1=Konacki, M.|journal=The Astrophysical Journal|volume=719|issue=2|pages=1293–1314|date=2010|bibcode=2010ApJ...719.1293K|doi=10.1088/0004-637X/719/2/1293|arxiv=0910.4482|s2cid=119253596}}

|primary=12 Boo Aa

|name=12 Boo Ab

|period_unitless={{val|fmt=commas|9.6045601|0.0000036}} d

|axis_unitless={{val|fmt=commas|3.4706|0.0055}} mas

|inclination={{val|107.95|0.12}}

|node={{val|80.49|0.10}}

|periastron={{val|fmt=commas|2454100.43572|0.00070}}

|eccentricity={{val|fmt=commas|0.19214|0.00015}}

|periarg={{val|286.832|0.029}}

|k1={{val|67.189|0.011}}

|k2={{val|69.311|0.014}}

}}

{{Starbox detail

|component1=12 Boo Aa

|mass={{val|1.4109|0.0028}}

|radius=2.450{{cite journal|doi=10.1093/mnras/stac2212| bibcode=2022MNRAS.516.3709B| arxiv=2208.02302| title=Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis |year=2022 |last1=Ball |first1=Warrick H. |last2=Miglio |first2=Andrea |last3=Chaplin |first3=William J. |last4=Stassun |first4=Keivan G. |last5=García |first5=Rafael |last6=González-Cuesta |first6=Lucia |last7=Mathur |first7=Savita |last8=Appourchaux |first8=Thierry |last9=Benomar |first9=Othman |last10=Buzasi |first10=Derek L. |last11=Jiang (姜晨) |first11=Chen |last12=Kayhan |first12=Cenk |last13=Örtel |first13=Sibel |last14=Çelik Orhan |first14=Zeynep |last15=Yıldız |first15=Mutlu |last16=Ong (王加冕) |first16=J M Joel |last17=Basu |first17=Sarbani |journal=Monthly Notices of the Royal Astronomical Society |volume=516 |issue=3 |pages=3709–3714 | doi-access=free}}

|temperature=6115

|metal_fe=−0.065

|luminosity=7.531

|gravity=3.73{{cite journal | bibcode=1999A&A...352..555A | arxiv=astro-ph/9911002 | title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures | journal=Astronomy and Astrophysics | volume=352 | pages=555–562 | last1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L. | year=1999 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/352/555/table1&Name=HIP69226 Vizier catalog entry]

|component2=12 Boo Ab

|mass2={{val|1.3677|0.0028}}

|temperature2=6200

|radius2=1.901

|luminosity2=4.692

|metal_fe2=−0.065

}}

{{Starbox catalog

| names = d Boötis, 12 Boötis, FK5 522, GC 19127, HIP 69226, HR 5304, HD 123999, GJ 9470, BD+25°2737, SAO 83203, WDS J14104+2506AB, CCDM 14104+2505

}}

{{Starbox reference

| Simbad = HD+123999

}}

{{Starbox end}}

12 Boötis is a spectroscopic binary{{cite journal | title=High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027 | last1=Konacki | first1=Maciej | last2=Muterspaugh | first2=Matthew W. | last3=Kulkarni | first3=Shrinivas R. | last4=Hełminiak | first4=Krzysztof G. | display-authors=1 | journal=The Astrophysical Journal | volume=719 | issue=2 | pages=1293–1314 | year=2010 | arxiv=0910.4482 | bibcode=2010ApJ...719.1293K | doi=10.1088/0004-637X/719/2/1293 | s2cid=119253596 }} in the constellation Boötes. It is approximately 122 light years from Earth.

12 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.82. It is a spectroscopic binary pair which orbit around its centre of mass once every 9.6045 days,{{cite journal | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | pages=3466 | year=2001 | last1=Mason | first1=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=B/wds/wds&WDS=14104%2B2506 Vizier catalog entry] with an estimated separation of 0.0035".{{cite journal | bibcode=2012A&A...546A..69M | doi=10.1051/0004-6361/201219774 | title=Dynamical masses of a selected sample of orbital binaries | journal=Astronomy & Astrophysics | volume=546 | pages=A69 | year=2012 | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S. | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A. | doi-access=free }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/546/A69/table1&WDS=14104%2B2506 Vizier catalog entry] The two stars have similar masses around {{solar mass|1.4}}, both are slightly hotter than the Sun and about twice as large.

A further companion, 12 Boötis B, was reported with a separation of approximately one arcsecond in 1989, but subsequent surveys have repeatedly failed to detect this companion.