Psi Ursae Majoris

{{Starbox begin

| name = Psi Ursae Majoris

}}

{{Starbox image

| image = {{Location map|100x100

|AlternativeMap=Ursa Major IAU.svg

|caption=

|alt=Diagram showing star positions and boundaries of the Ursa Major constellation and its surroundings

|width=320

|lat=46.9 |long=48.1

|mark=Cercle rouge 100%.svg | marksize=12

|float=center

}}| caption=Location of ψ Ursae Majoris (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Ursa Major

| ra = {{RA|11|09|39.8083}}

| dec = {{DEC|+44|29|54.556}}

| appmag_v = +3.01

}}

{{Starbox character

| type = Giant star

| class = K1 III

| u-b = +1.12

| b-v = +1.14

| r-i =

}}

{{Starbox astrometry

| radial_v = –3.39

| prop_mo_ra = –62.02

| prop_mo_dec = –27.78

| pm_footnote =

| parallax = 23.2272

| p_error = 0.2513

| parallax_footnote = {{Cite DR3|779106556394253824}}

| dist_footnote =

| absmag_v = −0.27

}}

{{Starbox detail

| source =

| mass = {{val|2.31|0.13}}

| radius = 19.12–20.79

| luminosity = {{val|140|3}}

| temperature = {{val|4543|6|fmt=commas}}

| rotational_velocity = 5.5

| gravity = {{val|2.12|0.05}}

| metal_fe = {{val|-0.11|0.03}}

}}

{{Starbox catalog

| names = ψ Ursae Majoris, ψ UMa, Psi UMa, 52 Ursae Majoris, BD+45 1897, FK5 420, GC 15340, HD 96833, HIP 54539, HR 4335, PPM 52277, SAO 43629.

}}

{{Starbox reference

|Simbad=psi+UMa

}}

Psi Ursae Majoris (Psi UMa, ψ Ursae Majoris, ψ UMa) is a star in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.01, making it a third magnitude star and one of the brighter members of the constellation. Parallax measurements place it at a distance of {{Convert|140|ly|pc|abbr=off|lk=on}} from Earth. This is sufficiently close that the magnitude of the star is only reduced by 0.05 due to extinction. In Chinese astronomy, Psi Ursae Majoris is called Tien Tsan or Ta Tsun, "Extremely Honorable". The name was possibly derived from the word 太尊, Pinyin: Tàizūn, meaning Royals, because this star stands alone as the only member of the Royals asterism within the Purple Forbidden enclosure (see Chinese constellation).

The spectrum of this star matches a stellar classification of K1 III, with the luminosity class of 'III' indicating this is an evolved giant star that has exhausted the supply of hydrogen at its core. As a consequence, it has expanded to around 20 times the radius of the Sun. It is radiating roughly 140 times the luminosity of the Sun from its enlarged outer envelope at an effective temperature of 4,543 K. At this heat, the star glows with the orange hue of a K-type star.

Psi Ursae Majoris is a member of the thin disk population of the Milky Way. It is following an orbit through the galaxy with a low eccentricity of 0.02 that will carry it between {{Convert|26.5|-|27.8|kly|kpc|abbr=on|lk=on}} from the Galactic Center. The low inclination of its orbit means the star will only stray {{Convert|130|ly|pc|abbr=on|lk=off}} from the galactic plane.

References

{{reflist|30em|refs=

{{citation

| title=Mg II chromospheric radiative loss rates in cool active and quiet stars

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| journal=Astronomy and Astrophysics

| volume=430 | pages=303–311 | date=January 2005

| doi=10.1051/0004-6361:20041440 | bibcode=2005A&A...430..303C |arxiv = astro-ph/0409683 | s2cid=12136256 }}

{{Cite journal |last1=Soubiran |first1=C. |last2=Creevey |first2=O. L. |last3=Lagarde |first3=N. |last4=Brouillet |first4=N. |last5=Jofré |first5=P. |last6=Casamiquela |first6=L. |last7=Heiter |first7=U. |last8=Aguilera-Gómez |first8=C. |last9=Vitali |first9=S. |last10=Worley |first10=C. |last11=de Brito Silva |first11=D. |date=2024-02-01 |title=Gaia FGK benchmark stars: Fundamental Teff and log g of the third version |bibcode=2024A&A...682A.145S |journal=Astronomy and Astrophysics |volume=682 |pages=A145 |doi=10.1051/0004-6361/202347136 |arxiv=2310.11302 |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/682/A145&HIP=HIP54539 Psi Ursae Majoris' database entry] at VizieR.

{{citation | display-authors=1 | last1=Frasca | first1=A. | last2=Covino | first2=E. | last3=Spezzi | first3=L. | last4=Alcalá | first4=J. M. | last5=Marilli | first5=E. | last6=Fżrész | first6=G. | last7=Gandolfi | first7=D. | title=REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters | journal=Astronomy and Astrophysics | volume=508 | issue=3 | pages=1313–1330 |date=December 2009 | doi=10.1051/0004-6361/200913327 | bibcode=2009A&A...508.1313F | arxiv=0911.0760 | s2cid=118361131 }}

{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F |arxiv = astro-ph/0409579 | s2cid=17804304 }}

{{Cite journal |last1=Gray |first1=David F. |last2=Kaur |first2=Taranpreet |date=2019-09-01 |title=A Recipe for Finding Stellar Radii, Temperatures, Surface Gravities, Metallicities, and Masses Using Spectral Lines |journal=The Astrophysical Journal |volume=882 |issue=2 |pages=148 |doi=10.3847/1538-4357/ab2fce |doi-access=free |bibcode=2019ApJ...882..148G |issn=0004-637X}}

{{cite journal | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | s2cid=121883397 | doi-access=free }}

{{citation | last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L. | title=A new photometric metal abundance and luminosity calibration for field G and K giants. | journal=Monthly Notices of the Royal Astronomical Society | volume=172 | pages=667–679 |date=September 1975 | issue=3 | bibcode=1975MNRAS.172..667J | doi=10.1093/mnras/172.3.667| doi-access=free }}

{{citation | title=psi UMa -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Psi+Ursae+Majoris | access-date=2012-01-16 }}

{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | access-date=2012-01-16 | archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=March 18, 2012 | url-status=dead }}

{{citation | url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Ursa_Major*.html | first1=Richard Hinckley | last1=Allen | title=Star Names — Their Lore and Meaning: Ursa Major | edition=Dover | year=1963 | publisher=University of Chicago }}

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}}

Ursae Majoris, Psi

Category:Ursa Major

Category:K-type giants

Category:Durchmusterung objects