Pi Boötis

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Template:Short description

Pi Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 4.49[1] (4.893 + 5.761)[3]
Characteristics
Spectral type B9 IIIp (MnHgSi) + A6 V[4]
U−B Template:Engvar −0.31[5]
B−V Template:Engvar −0.002±0.010[1]
R−I Template:Engvar −0.02Script error: No such module "Unsubst".
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: +13.922 mas/yr[2]
Dec.: +15.566 mas/yr[2]
Parallax (π)10.3357±0.1199 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)–0.39[7]
Details
π1 Boo
MassScript error: No such module "val".[7] Template:Solar mass
RadiusScript error: No such module "val".[7] Template:Solar radius
Luminosity214[7] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[8] dex
Rotational velocity (v sin i)14.0[9] km/s
π2 Boo
Surface gravity (log g)3.60±0.01[10] cgs
Temperature7504Script error: No such module "Su".[10] K
Metallicity [Fe/H]0.580[10] dex
Rotational velocity (v sin i)144[11] km/s
Other designations
Template:Odlist[12]
π1 Boötis: Template:Odlist
π2 Boötis: Template:Odlist
Database references
π1 Boo
SIMBADdata
π1 Boo
SIMBADdata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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Pi Boötis is a candidate triple star[13] 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.[14] Based upon an annual parallax shift of Script error: No such module "val".[2] 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[3] and a stellar classification of B9 IIIp (MnHgSi),[4] which suggests it is an evolved blue-white hued B-type giant star. It is a chemically peculiar star of the HgMn type,[9] with a spectrum that displays anomalous overabundances of mercury, manganese, and silicon.[4] This component is most likely a single-lined spectroscopic binary with an unknown companion.[13]

Its magnitude 5.76[3] visible companion, π2 Boötis, is a white-hued A-type main-sequence star with a class of A6 V.[4] It is spinning rapidly with a projected rotational velocity of 144 km/s.[11] As of 2010, the pair were separated by Script error: No such module "val". arcseconds on the sky along a position angle of Script error: No such module "val".. This corresponds to a projected separation of Script error: No such module "val".. The odds that is a mere chance alignment is 0.85%.[13]

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

References

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  1. ↑ a b c Template:Cite XHIP
  2. ↑ a b c d e Template:Cite Gaia DR3
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ a b c d Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ a b c Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b c Script error: No such module "citation/CS1".
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ Template:Cite simbad
  13. ↑ a b c Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Boötes

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