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upsilon1 Centauri

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

{{DISPLAYTITLE:Upsilon1 Centauri}}

{{other stars by Bayer designation|Upsilon Centauri{{!}}υ Centauri}}

{{Starbox begin

| name = υ1 Centauri

}}

{{Starbox observe

| epoch = J2000.0

| constell = Centaurus

| ra = {{RA|13|58|40.75}}

| dec = {{DEC|−44|48|12.9}}

| appmag_v = +3.87

}}

{{Starbox character

| type =

| class = B2 IV/V

| b-v = {{Val|−0.208|0.011}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+9.2|1.4}}

| prop_mo_ra = {{Val|-27.51|0.15}}

| prop_mo_dec = {{Val|-22.44|0.13}}

| parallax = 7.63

| p_error = 0.16

| parallax_footnote =

| absmag_v = −1.72

}}

{{Starbox detail

| mass = {{Val|7.9|0.1}}

| radius = {{Val|3.74|0.34}}

| metal_fe =

| gravity = {{Val|4.15|0.07}}

| age_myr = {{Val|13.0|2.0}}

| luminosity = 1,884

| temperature = {{Val|21411|377|fmt=commas}}

| rotational_velocity = 124

}}

{{Starbox catalog

| names = {{odlist | B=υ1 Cen | CD=−44°9010 | FK5=3112 | HD=121790 | HIP=68282 | HR=5249 | SAO=224585 }}

}}

{{Starbox reference

| Simbad = HD+121790

}}

{{Starbox end}}

Upsilon1 Centauri, Latinized from υ1 Centauri, is a single star in the southern constellation of Centaurus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.87. The distance to this object is approximately 427 light years based on parallax, and is receding with a radial velocity of +9 km/s. It is a member of the Lower Centaurus Crux group of the Scorpius–Centaurus association.

The stellar classification of this object is B2 IV/V, matching a massive B-type star with a luminosity class displaying mixed traits of a main sequence and a subgiant star. It is 13 million years old and is spinning with a projected rotational velocity of 124 km/s. The star has 7.9 times the mass of the Sun and 3.7 times the Sun's radius. It is radiating 1,884 times the luminosity of the Sun from its photosphere at an effective temperature of 21,411 K.

References

{{reflist|refs=

{{cite simbad | title=ups01 Oph | access-date=2019-10-21 }}

{{citation

| display-authors=1

| last1=Jilinski | first1=E. | last2=Daflon | first2=S.

| last3=Cunha | first3=K. | last4=de La Reza | first4=R.

| title=Radial velocity measurements of B stars in the Scorpius–Centaurus association

| journal=Astronomy and Astrophysics

| volume=448 | issue=3 |date=March 2006 | pages=1001–1006

| doi=10.1051/0004-6361:20041614 | bibcode=2006A&A...448.1001J

| arxiv=astro-ph/0601643 | s2cid=17818058 | postscript=. }}

{{citation

| display-authors=1 | last1=Hiltner | first1=W. A.

| last2=Garrison | first2=R. F. | last3=Schild | first3=R. E.

| title=MK Spectral Types for Bright Southern OB Stars

| journal=Astrophysical Journal | postscript=.

| volume=157 | pages=313–326 | date=July 1969

| doi=10.1086/150069 | bibcode=1969ApJ...157..313H | doi-access=free }}

{{citation

| display-authors=1 | last1=Tetzlaff | first1=N.

| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.

| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun

| journal=Monthly Notices of the Royal Astronomical Society

| volume=410 | pages=190–200 | year=2011

| issue=1 | bibcode=2011MNRAS.410..190T | arxiv=1007.4883

| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | s2cid=118629873 | postscript=. }}

{{citation | postscript=.

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| title=A catalogue of multiplicity among bright stellar systems

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869 | year=2008

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}

{{citation

| last1=Fitzpatrick | first1=E. L. | last2=Massa | first2=D.

| title=Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry

| journal=The Astronomical Journal

| volume=129 | issue=3 | pages=1642–1662 | date=March 2005

| doi=10.1086/427855 | arxiv=astro-ph/0412542

| bibcode=2005AJ....129.1642F | s2cid=119512018 | postscript=. }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F. | postscript=.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | year=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357

| s2cid=18759600 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=68048 Vizier catalog entry ]

}}

{{Stars of Centaurus}}

{{DEFAULTSORT:Upsilon1 Centauri}}

Category:B-type main-sequence stars

Category:B-type subgiants

Category:Lower Centaurus Crux

Category:Centaurus

Centauri, Upsilon1

Category:Durchmusterung objects

121790

068282

5249