:Pi Boötis

{{Starbox begin

| name = Pi Boötis

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|14|40|43.559}}

| dec = {{DEC|+16|25|05.98}}

| appmag_v = 4.49 {{nowrap|(4.893 + 5.761)}}

| constell = Boötes

}}

{{Starbox character

| class = {{nowrap|B9 IIIp (MnHgSi) + A6 V}}

| r-i = −0.02{{cn|date=June 2025}}

| v-r =

| b-v = −0.002{{±|0.010}}

| u-b = −0.31

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−1.1|0.8}}

| prop_mo_ra = +13.922

| prop_mo_dec = +15.566

| pm_footnote =

| parallax = 10.3357

| p_error = 0.1199

| parallax_footnote =

| absmag_v = –0.39

}}

{{Starbox detail

| source =

| component1 = π¹ Boo

| mass = {{Val|3.49|0.14}}

| radius = {{Val|3.2|0.4}}

| luminosity = 214

| temperature = {{Val|12052|456|fmt=commas}}

| metal_fe = {{Val|+0.18|0.17}}

| gravity = {{Val|3.99|0.18}}

| rotational_velocity = 14.0

| age_myr =

| component2 = π² Boo

| temperature2= 7504{{±|21|17}}

| gravity2 = 3.60{{±|0.01}}

| metal_fe2 = 0.580

| rotational_velocity2 = 144

}}

{{Starbox catalog

| names = {{odlist | B=π Boo | F=29 Boötis | BD=+17°2768 | HIP=71762 | ADS=9338 }}

| component1 = π¹ Boötis

| names1 = {{odlist | HD=129174 | HR=5475 | SAO=101138 }}

| component2 = π² Boötis

| names2 = {{odlist | HD=129175 | HR=5476 | SAO=101139 }}

}}

{{Starbox reference

| component = π¹ Boo

| Simbad = pi.01+Boo

}}

{{Starbox reference|no_heading=y

| component = π¹ Boo

| Simbad = pi.02+Boo

}}{{starbox sources|HIP|CCDM|HR}}

Pi Boötis is a candidate triple star system in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from π Boötis, and abbreviated Pi Boo or π Boo. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 4.50. Based upon an annual parallax shift of {{val|10.67|ul=mas}} as seen from Earth, it is located roughly 316 light years from the Sun.

The brighter primary, component π¹ Boötis, has a visual magnitude of 4.89 and a stellar classification of {{nowrap|B9 IIIp (MnHgSi)}}, which suggests it is an evolved blue-white hued B-type giant star. It is a chemically peculiar star of the HgMn type, with a spectrum that displays anomalous overabundances of mercury, manganese, and silicon. This component is most likely a single-lined spectroscopic binary with an unknown companion.

Its magnitude 5.76 visible companion, π² Boötis, is a white-hued A-type main-sequence star with a class of A6 V. It is spinning rapidly with a projected rotational velocity of 144 km/s. As of 2010, the pair were separated by {{Val|5.537|0.003}} arcseconds on the sky along a position angle of {{Val|110.5|0.5|u=°}}. This corresponds to a projected separation of {{Val|538.6|47.7|u=AU}}. The odds that is a mere chance alignment is 0.85%.

Pi Boötis has the Chinese traditional star name 左攝提二 (Zuǒ shè tí èr).

References

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External links

{{citation

| title=Pi Bootis | first1=James B. | last1=Kaler

| date=April 22, 2011 | work=Stars |publisher=University of Illinois

| url=http://stars.astro.illinois.edu/sow/piboo.html

| access-date=2017-10-13 | postscript=. }}

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205475 HR 5475]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J14407%2b1625A CCDM J14407+1625]
[http://aladin.u-strasbg.fr/AladinPreview?-c=14+40+43.5668%2B16+25+05.967&ident=HD+129174&submit=Aladin+previewer Image Pi Boötis]

Category:B-type giants

Category:A-type main-sequence stars

Category:Mercury-manganese stars

Category:Double stars

Category:Triple stars