126 Tauri

{{short description|Star in the constellation Taurus}}

{{Starbox begin|name=126 Tauri}}

{{Starbox observe

|epoch=J2000

|constell=Taurus

|ra={{RA|05|41|17.71768}}{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid=18759600}}

|dec={{DEC|+16|32|02.9253}}

|appmag_v=4.836{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}
(5.04 / 6.56)

}}

{{Starbox character

|class=B3 IV

|b-v=−0.12{{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}

|u-b=−0.64

}}

{{Starbox astrometry

|radial_v={{val|+21.90|0.9}}{{cite journal|title=Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations|author=Kharchenko, N. V.|display-authors=etal|journal=Astronomische Nachrichten|volume=328|issue=9|page=889|date=2007|bibcode=2007AN....328..889K|doi=10.1002/asna.200710776|arxiv=0705.0878|s2cid=119323941}}

|prop_mo_ra=+3.50

|prop_mo_dec=−15.47

|parallax=5.13

|p_error=0.81

|parallax_footnote=

}}

{{Starbox orbit

|reference={{cite journal |bibcode=2022AJ....164..184G |title=ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI |last1=Gardner |first1=Tyler |last2=Monnier |first2=John D. |last3=Fekel |first3=Francis C. |last4=Le Bouquin |first4=Jean-Baptiste |last5=Scovera |first5=Adam |last6=Schaefer |first6=Gail |last7=Kraus |first7=Stefan |last8=Adams |first8=Fred C. |last9=Anugu |first9=Narsireddy |last10=Berger |first10=Jean-Philippe |last11=Ten Brummelaar |first11=Theo |last12=Davies |first12=Claire L. |last13=Ennis |first13=Jacob |last14=Gies |first14=Douglas R. |last15=Johnson |first15=Keith J. C. |last16=Kervella |first16=Pierre |last17=Kratter |first17=Kaitlin M. |last18=Labdon |first18=Aaron |last19=Lanthermann |first19=Cyprien |last20=Sahlmann |first20=Johannes |last21=Setterholm |first21=Benjamin R. |journal=The Astronomical Journal |date=2022 |volume=164 |issue=5 |page=184 |doi=10.3847/1538-3881/ac8eae |doi-access=free |arxiv=2209.00669 }}{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|accessdate=20 August 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}

|primary=A

|name=B

|period={{val|118|7}}

|axis={{val|0.185|0.007}}

|eccentricity={{val|0.78|0.01}}

|inclination={{val|68.9|0.7}}

|node={{val|63.5|0.8}}

|periastron={{val|fmt=none|61118|35}}

|periarg={{val|338|4}}

}}

{{Starbox orbit

|reference=

|primary=Ba

|name=Bb

|period_unitless={{val|4.77095|0.00023|u=days}}

|axis_unitless={{val|0.055|0.013|ul=mas}}

|eccentricity=0.0

|inclination={{val|30|19}}

|node={{val|310|14}}

|periastron={{val|fmt=none|59529.10|0.01}}

|periarg=0.0

|k1={{val|72.9|0.3}}

}}

{{Starbox detail

|component1=128 Tau A

|mass=6.14{{cite journal |bibcode=2018ApJS..235....6T |title=The Updated Multiple Star Catalog |last1=Tokovinin |first1=Andrei |journal=The Astrophysical Journal Supplement Series |date=2018 |volume=235 |issue=1 |page=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 }}

|temperature=17,900{{cite journal|bibcode=2010AN....331..349H|doi=10.1002/asna.200911355|arxiv=1003.2335|title=Masses and luminosities of O- and B-type stars and red supergiants|journal=Astronomische Nachrichten|volume=331|issue=4|pages=349|year=2010|last1=Hohle|first1=M.M.|last2=Neuhäuser|first2=R.|last3=Schutz|first3=B.F.|s2cid=111387483}}

|luminosity=2,061

}}

{{Starbox detail|no_heading=y

|component1=Ba

|mass=3.19

|component2=B

|mass2=1.65

}}

{{Starbox catalog

|names={{odlist|BD=+16°841|HD=37711|HIP=26777|HR=1946|SAO=94759}}

}}

{{Starbox reference

|Simbad=126+Tau

}}

{{Starbox end}}

126 Tauri (126 Tau) is a triple star system in the constellation Taurus, approximately 600 light years away. Its apparent magnitude is 4.83, making it visible to the naked eye with dark skies.

126 Tauri is a well-known binary star with the two components in an eccentric orbit of over a hundred years. The secondary, component B, has also shown radial velocity variations that indicate an unseen companion in a 4.77-day orbit.

The combined spectral class is typically quoted as B3IV, occasionally B3V.{{cite journal |bibcode=2014yCat....1.2023S |title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- ) |last1=Skiff |first1=B. A. |journal=Vizier Online Data Catalog |date=2014 }} The primary alone has been classed as B3V,{{cite book|title=The Bright Star Catalogue|last1=Hoffleit|first1=Dorrit|last2=Jaschek|first2=Carlos|author-link=Dorrit Hoffleit|author2-link=Carlos Jaschek|bibcode=1991bsc..book.....H|publisher=Yale University Observatory|year=1991}} although the two components have been individually measured at B8V and B7V.