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Encyclopedia > Deneb
Deneb

Cygnus, the constellation in which Deneb is located.
Observation data
Equinox J2000
Constellation Cygnus
Right ascension 20h 41m 25.9s
Declination +45° 16' 49"
Apparent magnitude (V) 1.25
Characteristics
Spectral type A2 Ia
U-B color index −0.24
B-V color index +0.09
Variable type Alpha Cyg
Astrometry
Radial velocity (Rv) −4.5 km/s
Proper motion (μ) RA: 1.56 mas/yr
Dec.: 1.55 mas/yr
Parallax (π) 1.01 ± 0.57 mas
Distance approx. 3000 ly
(approx. 1000 pc)
Absolute magnitude (MV) −8.73
Other designations
α Cygni, Alpha Cyg, 50 Cyg, Arided, Aridif, Gallina, Arrioph, HR 7924, BD +44°3541, HD 197345, SAO 49941, FK5: 777, HIP 102098.

Deneb (α Cyg / α Cygni / Alpha Cygni) is the brightest star in the constellation Cygnus and one of the vertices of the Summer Triangle. The 19th brightest star in the night sky, with an apparent magnitude of 1.25, Deneb is also one of the most luminous stars known. It is, or has been, known by a number of other traditional names, including Arided and Aridif, but today these are almost entirely forgotten. This is a celestial map of the constellation Cygnus, the Swan Copyright © 2003 Torsten Bronger. ... From the Glossary of Astronomical Terms by the Harvard-Smithsonian Center for Astrophysics: Either of the two points (vernal, autumnal) on the celestial sphere where the ecliptic (which is the apparent path of the sun on the sky) intersects the celestial equator. ... This article or section does not cite its references or sources. ... Cygnus (Latin for swan) is a northern constellation. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... // 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, the 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, the 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 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 or lightyear, symbol ly, is a unit of length. ... 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. ... 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. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... Smithsonian Astrophysical Observatory Star Catalog contain the 258,996 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. ... This article is about the astronomical object. ... This article or section does not cite its references or sources. ... Cygnus (IPA: , Latin: ) is a northern constellation. ... The Summer Triangle is an astronomical asterism involving an imaginary triangle drawn on the northern hemispheres celestial sphere, with its defining vertices at Altair, Deneb, and Vega. ... Bright stars can be bright because they produce more light, because they are closer to us, or both. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... Below is a list of stars in arranged in order of increasing absolute bolometric magnitude (decreasing luminosity). ...

Contents

Distance and physical characteristics

Deneb's absolute magnitude is about −8.5, placing it among the most luminous stars known. 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. ...


Deneb's exact distance from the Earth is uncertain. The most likely distance is 3,200 light years, but the parallax uncertainties do not rule out a distance as close as 2,100 light years or as far as 7,400 light years. This distance uncertainty makes determining many of Deneb's other properties similarly imprecise. This does not cite its references or sources. ...


Estimates for Deneb's luminosity range from about 60,000 times the brightness of our Sun (if Deneb is 1600 light years away) to 250,000 times the Sun's brightness (if 3,200 light years away).[1] The Sun is the star at the center of the Solar System. ...

Estimates for Deneb's radius range from 200 to 300 times that of the Sun. This is the approximate size of the Sun (right) relative to Deneb.
Estimates for Deneb's radius range from 200 to 300 times that of the Sun. This is the approximate size of the Sun (right) relative to Deneb.

Based on its temperature and luminosity and also on direct measurements of its tiny angular diameter (a mere 0.002 second of arc), Deneb appears to have a diameter about 200 to 300 times that of the Sun; if placed at the center of our Solar System, Deneb would extend to the orbit of the Earth.[2] It is one of the largest stars known and the most powerful class A star identified. Image File history File links Sun_deneb_comparison. ... Image File history File links Sun_deneb_comparison. ... In astronomy, the solar radius is a unit of length used to express the size of stars and larger objects such as galaxies. ... The angular diameter of an object as seen from a given position is the diameter measured as an angle. ... Below a list of the largest stars, by solar diameter. ...


A star of spectral type A2Ia, Deneb has a surface temperature of 8,400 kelvins. Deneb is the prototype of a class of variable stars known as Alpha Cygni variables. Its surface undergoes non-radial fluctuations, which cause its brightness and spectral type to change slightly. 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. ... Most stars are of almost constant luminosity. ... Alpha Cygni variables are variable stars which exhibit non-radial pulsations. ...


Deneb's mass is estimated at 20 to 25 solar masses.[1][2] As a blue giant, its high mass and temperature mean that the star will have a short lifespan and will probably become a supernova within a few million years. It has already stopped fusing hydrogen in its core. In astronomy, a blue giant is a star with a spectral type of O or B and class of III (giant). ... Multiwavelength X-ray image of the remnant of Keplers Supernova, SN 1604. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ...


Deneb's solar wind causes it to lose mass at a rate of 0.8 millionth of a solar mass per year, a hundred thousand times the flow rate from the Sun.[2] The plasma in the solar wind meeting the heliopause For the British comic, see Solar Wind (comic). ...


Name

The name is from dheneb, the Arabic for "tail", from the phrase ذنب الدجاجة ðanab ad-dajājah, or "tail of the hen". Similar names were given to at least seven different stars, most notably Deneb Kaitos, the brightest star in the constellation Cetus, and Denebola, the second brightest star in Leo. Deneb Kaitos (Arabic for tail of Cetus, also known as Diphda frog, from the Arabic الضفدع الثاني aD-Dafda‘ aθ-θānī the second frog) is the common name of β Ceti, the brightest star in... Cetus (a name from Greek mythology, referring to a Whale or Sea monster, see Ceto) is a constellation of the southern sky, in the region known as the Water, near other watery constellations like Aquarius, Pisces, and Eridanus. ... Denebola (β Leo / β Leonis / Beta Leonis) is the second brightest star in the constellation Leo. ... Leo (IPA: , Latin: , symbol , ) is a constellation of the zodiac. ...


It is known as 天津四 (the Fourth Star of the Celestial Ford) in Chinese.


Mythology

In the Chinese love story of Qi Xi, Deneb marks the magpie bridge across the Milky Way which allows the separated lovers Niu Lang (Altair) and Zhi Nü (Vega) to be reunited on one special night of the year in late summer. In other versions of the story Deneb is a fairy who acts as chaperone when the lovers meet across the bridge of magpies. JADE LOSHI IS A NOOB! Qi Xi (七夕; Pinyin: qÄ« xÄ«; The Night of Sevens), sometimes called Chinese Valentines Day, falls on the seventh day of the seventh lunar month on the Chinese calendar; thus its name. ... The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Γαλαξίας (Galaxias), sometimes referred to simply as the Galaxy), is a barred spiral galaxy of the Local Group. ... Altair (α Aql / α Aquilae / Alpha Aquilae / Atair ) is the brightest star in the constellation Aquila and the twelfth brightest star in the nighttime sky, at visual magnitude 0. ... Vega (α Lyr / α Lyrae / Alpha Lyrae) is a white main sequence star approximately 25. ...


See also

Deneb (Alpha Cygni), a highly luminous blue giant star, is the brightest star in the constellation Cygnus and one of the brightest stars in the night sky. ...

Notes

  1. ^ a b Deneb at domeofthesky.com
  2. ^ a b c Deneb by Jim Kaler at astro.uiuc.edu

External links

  • Hipparcos star catalog entry

  Results from FactBites:
 
Deneb - Wikipedia, the free encyclopedia (842 words)
Deneb (α Cyg / α Cygni / Alpha Cygni) is the brightest star in the constellation Cygnus and one of the brightest stars in the night sky, with apparent magnitude 1.25.
Deneb is the prototype of a class of variable stars known as Alpha Cygni variables.
Deneb is also the location of a major battle in the computer game Freespace 2 between the Galactic Terran Vasudan Alliance and the Neo-Terran Front during the late 24th century.
Deneb (479 words)
"Deneb" is from an Arabic word meaning "tail," as this first magnitude (1.25) star, the 19th brightest as it appears in our sky, represents the tail of Cygnus the Swan, a classical figure seen flying perpetually to the south along the route of the Milky Way.
Deneb is a true supergiant, its diameter, calculated from its temperature and luminosity, is 200 times that of the Sun.
In the Chinese love story of Qi Qiao Jie, Deneb marks the magpie bridge across the Milky Way which allows the separated lovers Niu Lang (Altair) and Zhi Nu (Vega) to be reunited on one special night of the year in late summer.
  More results at FactBites »

 
 

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