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Topic: Alpha Centauri B


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In the News (Sat 16 Feb 19)

  
  Alpha Centauri - Wikipedia, the free encyclopedia
Alpha Centauri A is also known as HD 128620, HR 5459, CP-60°5483, GCTP 3309.00A, and LHS 50.
It consists of two main stars, Alpha Centauri A and Alpha Centauri B (which form a binary star together) at a distance of 4.36 ly, and a dimmer red dwarf named Proxima Centauri at a distance of 4.22 ly.
The closest neighbours to the Alpha Centauri system are the Sun and Barnard's star (1.98 pc or 6.47 ly), which is also the next nearest star from Earth, at a distance of 5.96 ly.
en.wikipedia.org /wiki/Alpha_Centauri   (1194 words)

  
 eSky: Alpha Centauri
Alpha Centauri is a star of the southern sky, and is not visible to observers at a latitude greater than about 25° north (roughly the latitude of Florida, Egypt or Taiwan).
Beyond the A and B stars, there is a third component in the system: Alpha Centauri C. This is a tiny, faint red dwarf orbiting the two main stars at an immense distance: roughly one fifth of a light year.
Alpha Centauri - famous as the nearest visible star to the Sun - represents the foot of the Centaur, and falls near the southern and eastern borders of that constellation, on the fringes of Circinus.
www.glyphweb.com /esky/stars/alphacentauri.html   (859 words)

  
 Alpha Centauri B   (Site not responding. Last check: 2007-10-21)
Alpha Centauri B (also Rigel Kentaurus B — the foot of the centaur in Arabic) is a star of the Alpha Centauri star system.
Sid Meier's Alpha Centauri minisite Offre la possibilità di scaricare gli aggiornamenti per giocare a Alpha Centauri in italiano.
Alpha Centauri Strategie e trucchi per concludere il gioco di Sid Meier.
www.serebella.com /encyclopedia/article-Alpha_Centauri_B.html   (262 words)

  
 Alpha Centauri   (Site not responding. Last check: 2007-10-21)
Alpha Centauri is the brightest star system in the southern constellation of Centaurus, andis the third brightest in the entire night sky (although too far south to bevisible in most of the northern hemisphere).
Like the sun, its spectral type is G2 V. Thesmaller of the two, Alpha Centauri B, is dimmer, with a spectraltype of K1 V. The two orbit one another elliptically (e=0.52), approaching as close as 11.2 astronomical units and receding to 35.6 AU with a period of just under 80 years.
Some have speculated that any terrestrial planets in the Alpha Centauri system may be dry because it isbelieved that Jupiter and Saturn were crucial at directing comets into the inner solarsystem and providing the inner planets with a source of water.
www.therfcc.org /alpha-centauri-31544.html   (395 words)

  
 Alpha Centauri
Alpha Centauri A is a yellow G star similar to the Sun but about 1.5 times as bright; B is a smaller, orange K star with about half the Sun's luminosity.
The third possible member of the system, Proxima Centauri, is a red dwarf, about 7,000 times fainter than the Sun, which, if it is truly associated with the main pair, moves in a very wide orbit with a period of millions of years.
Whether or not the Alpha Centauri system contains any planets is undetermined but there has been much speculation about how, if it did, a planet would have to move in order to have the best chance of supporting life.
www.daviddarling.info /encyclopedia/A/AlphaCen.html   (478 words)

  
 Destination: Alpha Centauri
The distance between "A" and "B" and their relationship with "C" is so far that it is not known whether Alpha Centauri "C" is really bound to the twin movements and orbits of "A" and "B", or if "C" will simply leave the union of its own accord in the next several million years.
Alpha Centauri "B" is a K1 star, hotter and brighter than most other K spectral class stars, therefore it may pass this test or it may not.
Our understanding of the nature of the orbits of the binary Alpha Centauri "A" and Alpha Centauri "B" point to the fact that their closest approach towards each other is 11 AU which means that the theoretical limit for planetary orbits is somewhere in the region of two astronomical units.
www.goingfaster.com /icarus/destinationalpha.htm   (1926 words)

  
 Alpha Centauri 3
The distance separating Alpha Centauri A from its companion star B averages 23.7 AUs (semi-major axis of 17.59" with a HIPPARCOS distance estimate of 4.40 light-years).
Proxima (Alpha Centauri C) is a very cool and very dim, main sequence red dwarf (M5.5Ve) that appears to have only 12.3 percent of Sol's mass and 14.5 percent of its diameter (ESO press releases of 3/15/03 and 2/22/02; and Doyle and Butler, 1990, page 337).
Alpha Centauri is not visible in much of the Northern Hemisphere, as Constellation Centaurus cannot be viewed from middle northern latitudes of around 40 degrees, but should become more easily visible to observers that travel south of the equator.
www.solstation.com /stars/alp-cent3.htm   (2117 words)

  
 Alpha Centauri
Alpha Centauri C lies measurably closer to us than the other two: It is only 4.22 light-years away, and it is the nearest individual star to the Sun.
Alpha Centauri A is a yellow star with a spectral type of G2, the same as the Sun's.
Alpha Centauri B is an orange star with a spectral type of K1.
imagine.gsfc.nasa.gov /docs/ask_astro/answers/970717b.html   (711 words)

  
 A Family Portrait of the Alpha Centauri System - VLT Interferometer Studies the Nearest Stars   (Site not responding. Last check: 2007-10-21)
Alpha Centauri A and B orbit each other at a distance of about 3600 million km, or somewhat more than the distance of planet Uranus from the Sun.
In addition to providing general information about stellar evolution, the detailed study of Alpha Centauri A and B is particular interesting as it allows verification of our current knowledge about the composition, structure and indeed, future development, of our own main energy source, the Sun.
For the observations of the A and B pair, the 0.35-m VLTI siderostats on the observing platform at the Paranal summit.
www.brightsurf.com /news/march_03/ESO_news_032103.html   (1168 words)

  
 Alpha Centauri - A Candidate for Terrestrial Planets And Intelligent Life ~ at runboard.com   (Site not responding. Last check: 2007-10-21)
Alpha Centauri is a special star - not only because it is the closest stellar system to the sun but also because it is one of the relatively few places in the Milky Way Galaxy that may offer terrestrial life conditions.
Alpha Centauri A is a yellow star with a spectral type of G2, exactly the same as the Sun's.
Alpha Centauri B is a K1 star, so it is hotter and brighter than most K stars, therefore it may pass this test or it may not.
com3.runboard.com /bfarfrontiers.forum09.t3   (1428 words)

  
 Alpha Centauri biography .ms   (Site not responding. Last check: 2007-10-21)
Alpha Centauri is the brightest star system in the southern constellation of Centaurus, and is the third brightest in the entire night sky (although too far south to be visible in most of the northern hemisphere).
It and the nearby Beta Centauri are the "Pointers" to the Southern Cross.
Viewed from Alpha Centauri, the sky would appear very much as it does to us with most of the constellations such as Ursa Major and Orion being unchanged.
alpha-centauri.biography.ms   (567 words)

  
 Rigil Kentaurus - Wikipedia
Er ist hauptsächlich unter seiner Bayer-Bezeichnung Alpha Centauri bekannt.
Das etwa 4,35 Lichtjahre entfernte Sternensystem besteht aus drei einzelnen Sternen Alpha Centauri A, Alpha Centauri B und Alpha Centauri C (auch Proxima Centauri genannt).
Alpha Centauri C, ein Roter Zwerg, ist von ihnen 13.000 AE entfernt.
de.wikipedia.org /wiki/Rigil_Kentaurus   (185 words)

  
 SPACE.com -- The 10 Brightest Stars   (Site not responding. Last check: 2007-10-21)
Alpha Centauri (or Rigel Kentaurus, as it is also known) is actually a system composed of three gravitationally bound stars.
Centauri A and B are remarkably Sun-like, with Centauri A being a near twin of the Sun (both are yellow G stars).
In comparison to the Sun, Alpha Centauri A is 1.5 times as luminous and shines at magnitude -0.01 while Alpha Centauri B is half as luminous and shines at magnitude 1.3.
www.space.com /scienceastronomy/brightest_stars_030715-3.html   (475 words)

  
 Alpha Centauri   (Site not responding. Last check: 2007-10-21)
Alpha Centauri è la stella più brillante della costellazione del Centauro nel cielo australe ed è la stella più brillante del cielo notturno.
di due stelle principali Alpha Centauri A e Alpha Centauri B (che formano una stella doppia) e una nana rossa più debole chiamata Proxima Centauri.
Alcuni ipotizzano eventuali pianeti terrestri in Alpha Centauri sarebbero privi d'acqua perché si pensa che Giove Saturno abbiano rivestito un ruolo cruciale nel comete ricche d' acqua verso i pianeti interni.
it.freeglossary.com /Alpha_Centauri   (301 words)

  
 KENT AND THE KENTYANS-ALPHA CENTAURI SYSTEM
The two main stars are Alpha Centauri A and Alpha Centauri B, while the third star is Alpha Centauri C or Proxima Centauri.
The larger star is Alpha Centauri A, a G2-class star that is the near double of Earth's sun in terms of size, luminosity, energy output and most important, stability.
Alpha Centauri C orbits the other two stars from a distance of 13,000 AU (or 1.95 trillion kilometres), and it is a young and dim red dwarf.
ussathena.iwarp.com /ship/kent1.htm   (981 words)

  
 GAT: Alpha Centauri - Wikibooks
Alpha Centauri is the closest star system to Earth (4.3 light years).
Alpha Centauri is actually a triple star system, consisting of Alpha Centauri A and Alpha Centauri B (which together form a binary star, and Proxima Centauri, a red dwarf.
Computer models suggest that the A and B stars are excellent candidates for having Earth-like (terrestrial) planets, but probably not gas-giant planets like Saturn and Jupiter.
en.wikibooks.org /wiki/GAT:_Alpha_Centauri   (190 words)

  
 Encyclopedia: List of astronomical topics   (Site not responding. Last check: 2007-10-21)
An alpha particle is deflected by a magnetic field Alpha particles or alpha rays are a form of particle radiation which are highly ionizing and have low penetration.
The alpha reactions is one of two class of fusion reactions by which stars convert helium into heavier elements, the other being the triple_alpha process.
Antares (α Sco / α Scorpii / Alpha Scorpii) is the brightest star in the constellation Scorpius and one of the brightest stars in the nighttime sky.
www.nationmaster.com /encyclopedia/List-of-astronomical-topics   (6022 words)

  
 List of nearest stars   (Site not responding. Last check: 2007-10-21)
Alpha Centauri A - 4.36 LY [YS] #
Alpha Centauri B - 4.36 LY [YS] # Barnard's star - 5.96 LY [YH] # Teegarden's star - 7.5 LY (discovered 2003; exact distance is still uncertain) # Wolf 359 - 7.78 LY [Y] # Lalande 21185 - 8.29 LY [YH] # Sirius Star System #
Gl 473 B - 14.30 LY [Y] Note on nearest star systems: light year distances taken from parallax data determined by the Research Consortium on Nearby Stars (or Recons).
www.serebella.com /encyclopedia/article-List_of_nearest_stars.html   (686 words)

  
 A family portrait of the Alpha Centauri System
Alpha Centauri A and B orbit each other at a distance of about 3600 million km, or somewhat more than the distance of planet Uranus from the Sun [2].
From this multi-technique calibration, the mass of Alpha Centauri B component was also deduced and, among other stellar parameters, the radii of both stars were predicted with high precision, as 1.230 ± 0.003 (star "A") and 0.857 ± 0.007 ("B") times that of the Sun, respectively.
Among other parameters, the radii of the stars A and B were predicted with high precision (Thévenin et al., 2002, A&A, 392, L9).
www.eurekalert.org /pub_releases/2003-03/eso-afp032003.php   (1489 words)

  
 3D Universe: Views from Distant Worlds   (Site not responding. Last check: 2007-10-21)
Alpha Centauri is famous as the nearest star to the Sun.
The average separation of the stars in the Alpha Centauri binary system is roughly comparable to that between the Sun and Uranus.
An Earthlike planet would have to be a bit farther from Alpha Centauri A, and a bit closer to Alpha Centauri B, than the Earth is from the Sun, but that's it.
www.astronexus.com /3duniv/contents/dw-pages/dw-alphacen.html   (367 words)

  
 SPACE-TALK - Alpha Centauri- Do you think life is there?   (Site not responding. Last check: 2007-10-21)
Alpha Centauri A and B are not extremely close to one another (they vary between 11 and 35 AU separation), but they are certainly close enough that any planet would feel the effects of both stars.
Of the two, Alpha Centauri A would be the most likely to have a life-giving planet.
Other factors to consider are increased asteroid impacts due to the presence of the other star, the large x-ray flux from the corona of the Alpha Centauri B, the formation scenario (was it a capture or did they form from a single protoplanetary disk?), and planet migration.
www.space-talk.com /ForumE/showthread.php3?threadid=1064   (876 words)

  
 Encyclopedia of Suns: Alpha Centauri A   (Site not responding. Last check: 2007-10-21)
From places where it is visible, Alpha Centauri is unmistakable -- it is the third brightest star in the whole sky, and forms a stunning naked-eye double star with the star Hadar, also known as Beta Centauri.
Alpha Centauri is a relatively old star, thought to be slightly older than the Sun, and relatively rich in heavy elements.
The Encyclopedia entry is for the largest and brightest, Alpha Centauri A. Alpha Centauri B, the closer companion, has about one-half the luminosity of the Sun (rather similar to Tau Ceti), and hence counts as a Sunlike star in the Encyclopedia.
www.astronexus.com /scripts/eos/eos_star.php?IDType=HD&ID=128620   (444 words)

  
 Alpha Centauri AB System Orbits
Center of H.Z. This animation attempts to relate the orbits and possible habitable zones of Stars A and B in the Alpha Centauri AB system to their common center of mass.
At their closest approach, Stars A and B are about two AUs farther apart than the average orbital distance of Saturn around the Sun, while their widest separation is still about six AUs farther the average orbital distance of Neptune.
Hence, under optimal conditions, either Alpha Centauri A and B could hold four inner rocky planets like the Solar System: Mercury (0.4 AU), Venus (0.7 AU), Earth (1 AU), and Mars (1.5 AUs).
www.solstation.com /orbits/ac-absys.htm   (322 words)

  
 Alpha Centauri   (Site not responding. Last check: 2007-10-21)
Note that Proxima Centauri is also known as Alpha Cenaturi C. Alpha Centauri A is a yellow star which is the same type as the Sun.
Alpha Centauri is also called by the Arabic name Rigil Kentaurus, which means "the foot of the Centaur."
Alpha Cenaturi A and B are a binary pair.
www.vibrationdata.com /space/alpha.htm   (159 words)

  
 A family portrait of the Alpha Centauri system
From this multi-technique calibration, the mass of Alpha Centauri B component was also deduced and, among other stellar parameters, the radii of both stars were predicted with high precision, as 1.230 +- 0.003 (star "A") and 0.857 +- 0.007 ("B") times that of the Sun, respectively.
Solar-like p-oscillations in Alpha Centauri A were announced by Bouchy and Carrier in Astronomy and Astrophysics (Vol.
Among other parameters, the radii of the stars A and B were predicted with high precision (Thevenin et al., 2002, AandA, 392, L9).
www.govertschilling.nl /nieuws/archief/2003/0303/030315_eso.htm   (1470 words)

  
 Earth-Avengers Galactic Battatlion (Avengers Forever)
Alpha Centauri is the star system which is the closest to Earth, being only about 4.3 light-years away.
It is a trinary star system which is composed of two stars (Alpha Centauri A and Alpha Centauri B) which orbit each other as a "relatively close binary" system 4.36 light-years away; and their distant companion, Proxima Centauri (sometimes called Alpha Centauri C), which is slightly closer to Earth (at 4.22 light-years away).
Native to Beta Centauri IV (or, more likely Alpha Centauri B IV (see comments)), these would be the precursors of the race to which Yondu Udonta belongs in the alternate future reality of Earth-Guardians of the Galaxy, in the 31st Century.
www.marvunapp.com /Appendix/earthavengersgalbat.htm   (1182 words)

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