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Encyclopedia > Tau Boötis

τ Boötis (τ Boo / Tau Boötis) is a 4th magnitude star in the constellation of Boötes. The system is a binary. The primary component is a yellow-white dwarf (spectral type F7 V) and secondary is a dim red dwarf (spectral type M2 V). Tau (upper case Τ, lower case τ) is the 19th letter of the Greek alphabet. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The Pleiades star cluster A star is any massive gaseous body in outer space just like the Sun. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Boötes, a name deriving from Egypt, is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy. ... Binary star A binary star system consists of two stars both orbiting around their barycenter. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... This article is about red dwarfs, the type of star. ...


The system is relatively nearby, distance being about 51 light years. The primary star should be easily visible to the unaided eye under dark skies. A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...


In 1997 a planet, designated as Tau Boötis Ab was discovered orbiting the primary star. There is also some indications of another, more distant planet orbiting the star. 1997 is a common year starting on Wednesday of the Gregorian calendar, and was designated the International Year of the Reef. ... A planet (from the Greek πλανήτης, planētēs or wanderers) is a body of considerable mass that orbits a star and that produces no energy through nuclear fusion. ...




Tau Boötis A

τ Boötis A
Epoch 2000
Constellation Boötes
Right Ascension 13h 47m 15.74s
Declination +17° 27' 24.86"
Distance 50.84 ly (15.60 pc)
Spectral Type F7V
Apparent Magnitude 4.50
Other Designations 4 Boo A, BD+18°2782 A,
GJ 527 A, HD 120136,
HIP 67275, HR 5185,
NSV 6444

The primary star, Tau Boötis A is a yellow-white dwarf. It is 20% more massive than our Sun and thus is somewhat brighter and hotter. It has a radius 1.9 times solar, and is probably about 1300 million years old. Since it is more massive than the Sun, its lifespan is shorter being less than 6000 million years. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... 2000 is a leap year starting on Saturday of the Gregorian calendar. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Boötes, a name deriving from Egypt, is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... A Sun is the star at the centre of a solar system. ...


It is also listed as a suspected variable star. However, the star is not variable. Most stars are of nearly constant luminosity. ...




Tau Boötis B

τ Boötis B
Epoch 2000
Constellation Boötes
Right Ascension 13h 47m 15.6s
Declination +17° 27' 28"
Distance 50.84? ly (15.60? pc)
Spectral Type M2
Apparent Magnitude 11.1
Other Designations 4 Boo B, BD+18°2782 B,
GJ 527 B

Tau Boötis B is a dim red dwarf orbiting the primary star at a distance of 240 AU. One orbit around the primary would take thousands of years to complete. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... 2000 is a leap year starting on Saturday of the Gregorian calendar. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Boötes, a name deriving from Egypt, is one of the 88 modern constellations and was also one of the 48 constellations listed by Ptolemy. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... This article is about red dwarfs, the type of star. ... The astronomical unit (AU or au or a. ...




External links

  • SIMBAD (http://simbad.u-strasbg.fr/Simbad) component A entry (http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=HD+120136) component B entry (http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=GJ527B)
  • The Extrasolar Planets Encyclopaedia (http://www.obspm.fr/encycl/encycl.html) entry (http://www.obspm.fr/encycl/tau-Boo.html)
  • Extrasolar Visions (http://www.extrasolar.net) entry (http://www.extrasolar.net/startour.asp?StarCatID=normal&StarID=9)

 
 

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