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Encyclopedia > Beta Capricorni
β¹/β² Capricorni
Observation data
Epoch J2000.0
Constellation Capricornus
Right ascension 20h21m00.7s
Declination −14°46′53″
Apparent magnitude (V) +3.05/+6.09
Characteristics
Spectral type K0II+B8V/A0III
B-V color index 0.79/−0.02
U-B color index 0.28/−0.11
Variable type none
Astrometry
Radial velocity (Rv) −19/−18 km/s
Proper motion (μ) RA: 48.42/42.64 mas/yr
Dec.: 14.00/0.37 mas/yr
Parallax (π) 9.94 ± 1.00 mas
Distance 328 ly (101 pc)
Absolute magnitude (MV) −1.96/+1.08
Other designations
Dabih, Dabikh, Dikhabda, 9 Capricorni, HR 7776/7775, HD 193495/193452, BD−15°5629/−15°5626, FK5 762, HIP 100345/100325, SAO 163481/164371, GC 28295/29286, ADS 13717, CCDM 20210-1447

Beta Capricorni (β Cap / β Capricorni) is a star system in the constellation Capricornus. It also has the traditional name Dabih, which comes from the Arabic, meaning "butchers". The β Capricorni system is located 328 light years from Earth. Because it is near the ecliptic, β Capricorni can be occulted by the Moon, and also (rarely) by planets. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... It has been suggested that this article or section be merged into Julian epoch. ... This article or section does not cite its references or sources. ... Capricornus ( or , Unicode: ♑), a name meaning Horned Goat or That which has horns like a goats in Latin, is one of the constellations of the zodiac. ... 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. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... In astronomy, color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. ... In astronomy, color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. ... Most stars are of almost constant luminosity. ... This article does not cite its references or sources. ... Radial velocity is the velocity of an object in the direction of the line of sight. ... kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. ... The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... This article or section does not cite its references or sources. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... Distance is a numerical description of how far apart things lie. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Stellar parallax motion The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us (in the absence of interstellar extinction!). It allows the overall brightnesses of objects to be compared without regard to distance. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Fifth Fundamental Catalogue is a glossary of positions of stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... A star system or stellar system is a system comprised of a star or group of stars, and, perhaps, planetary systems of smaller bodies (such as planets or asteroids), in gravitational association. ... This article or section does not cite its references or sources. ... Capricornus ( or , Unicode: ♑), a name meaning Horned Goat or That which has horns like a goats in Latin, is one of the constellations of the zodiac. ... The Arabic language ( ), or simply Arabic ( ), is the largest member of the Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew and Aramaic. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ... Bulk composition of the Moons mantle and crust estimated, weight percent Oxygen 42. ... The eight planets and three dwarf planets of the Solar System. ...

Contents

Visual double

With binoculars or a small telescope, β Capricorni can be resolved into a double star. The brighter of these two components, β¹ Capricorni or Dabih Major, has an apparent magnitude of +3.05, while the dimmer one, β² Capricorni or Dabih Minor, has an apparent magnitude of +6.09. The two components are separated by 3.5 arcminutes on the sky, putting them at leat 21,000 AU (0.34 light years) apart. They take approximately 700,000 years to complete one orbit. Both of these components are themselves made up of multiple stars. Resolving power is the ability of a microscope or telescope to measure the angular separation of images that are close together. ... When two stars are so nearly in the same direction as seen from Earth that they appear to be a single star to the naked eye but may be separated by the use of telescopes, they are referred to as a double star. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... A minute of arc, arcminute, or MOA is a unit of angular measurement, equal to one sixtieth (1/60) of one degree. ... The astronomical unit (AU or au or a. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ...


Due to the complexity of this system, several different schemes have arisen to denote the subcomponents. This article follows the naming used in the Multiple Star Catalogue[1].


β¹ Capricorni

The brighter component, β¹ Capricorni, is the more complex of the pair. It has at least three components, and it's spectrum is difficult to interpret. It is dominated by a pair of stars, the orange K-type bright giant β Capricorni Aa, with an apparent magnitude of +3.08, and the blue-white B-Type main sequence dwarf, β Capricorni Ab with an apparent magnitude of +7.20. These two components are separated by 0.05 arcseconds (5 AU) and have an orbital period of 3.77 years. In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... The luminosity class II in the Yerkes spectral classification is given to bright giants. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ...


The Aa component has a surface temperature of 4900 kelvins, a diameter of 35 times that of the Sun, and a luminosity 600 times that of the Sun. The Ab component has another, unseen companion, β Capricorni Ac, which orbits Ab with an orbital period of 8.7 days. It is thought that the Aa component is itself multiple. The Sun is the star of our solar system. ... Luminosity has different meanings in several different fields of science. ...


β² Capricorni

The dimmer of the visual double star, β¹ Capricorni, is simpler and more studied. It is a binary star, whose brighter component, β Capricorni B, has a magnitude of 6.1. It is a A0-giant with 40 times the luminosity of the Sun. The companion, β Capricorni C, is approximately 3 arcseconds from B. β Capricorni B is unusual for having large amounts of mercury and manganese in its atmosphere. Giant star is a star that has stopped fusing hydrogen in its core. ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ... General Name, Symbol, Number mercury, Hg, 80 Chemical series transition metals Group, Period, Block 12, 6, d Appearance silvery white Atomic mass 200. ... General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ...


Other components

Two other nearby stars were discovered by John Herschel. These lie 112 arcseconds away from β¹ Capricorni, and it is unclear whether they are simply optical doubles or part of the β Capricorni system. They are sometimes referred to as β Capricorni D and E. John Herschel Sir John Frederick William Herschel (7 March 1792 – 11 May 1871) was an English mathematician and astronomer. ... A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7. ... This topic is about the astronomical phenomenon. ...


References

  1. ^ Tokovinin, A. A. (1997). "MSC - a catalogue of physical multiple stars". A&AS 124: 75-84.

External links


  Results from FactBites:
 
Beta Capricorni - Wikipedia, the free encyclopedia (491 words)
Beta Capricorni (β Cap / β Capricorni) is a star system in the constellation Capricornus.
It is dominated by a pair of stars, the orange K-type bright giant β Capricorni Aa, with an apparent magnitude of +3.08, and the blue-white B-Type main sequence dwarf, β Capricorni Ab with an apparent magnitude of +7.20.
The companion, β Capricorni C, is approximately 3 arcseconds from B. β Capricorni B is unusual for having large amounts of mercury and manganese in its atmosphere.
Delta Capricorni at AllExperts (323 words)
The primary, δ Capricorni A is classified a white A-type giant with an apparent magnitude of +2.85.
It is a spectroscopic binary whose two components are of magnitude +3.2 and +5.2, and separated by 0.0018 arcseconds.
The sixteenth magnitude δ Capricorni C is one arcminute away and the thirteenth magnitude δ Capricorni D is two arcminutes away from the primary.
  More results at FactBites »

 
 

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