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Star system in the Centaurus constellation
Alpha Centauri (α Centauri, α Cen, or Alpha Cen) is a star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus
Alpha_Centauri
Candidate exoplanet orbiting Alpha Centauri A
Alpha Centauri Ab (also known as Rigil Kentaurus b, or originally as Candidate 1) is a candidate exoplanet that was first directly imaged around Alpha
Alpha_Centauri_Ab
Terrestrial planet orbiting the star Proxima Centauri
constellation Centaurus. It can also be referred to as Proxima b, or Alpha Centauri Cb. The host star is the closest star to the Sun, at a distance of about
Proxima_Centauri_b
Nearest star to the Solar System
Centauri is a member of the Alpha Centauri star system, being identified as component Alpha Centauri C, and is 2.18° southwest of the Alpha Centauri AB
Proxima_Centauri
Topics referred to by the same term
Alpha Centauri b or Alpha Centauri B may refer to: Alpha Centauri B (Toliman), the second largest star in the α Cen trinary system Alpha Centauri Ab, an
Alpha_Centauri_b
Triple star system in the constellation Centaurus
determine south. The Beta Centauri system is made up of three stars: Beta Centauri Aa, Beta Centauri Ab, and Beta Centauri B. All the spectral lines detected
Beta_Centauri
Sub-Earth orbiting Proxima Centauri
to the Sun and part of the Alpha Centauri triple star system. Together with one or two other planets in the Proxima Centauri system, it is the closest
Proxima_Centauri_d
Disproven exoplanet orbiting Alpha Centauri B
Alpha Centauri Bb (α Cen Bb) was a proposed exoplanet orbiting the K-type main-sequence star Alpha Centauri B (Toliman), located 4.37 light-years from
Alpha_Centauri_Bb
NASA concept for uncrewed probe - possibly a light sail
The 2069 Alpha Centauri mission is a NASA interstellar probe mission concept. In December 2017, NASA released a mission concept involving the launch, in
2069_Alpha_Centauri_mission
dwarfs, as well as 4 sub-brown dwarfs. The closest system is Alpha Centauri, with Proxima Centauri as the closest star in that system, at 4.2465 light-years
List_of_nearest_stars
Small number of stars that orbit each other
Proxima Centauri. Together, Rigil Kentaurus and Toliman form a physical binary star, designated as Alpha Centauri AB, α Cen AB, or RHD 1 AB, where the AB denotes
Star_system
System of two stars orbiting each other
Lyrae), but also hundreds of thousands of years (Proxima Centauri around Alpha Centauri AB). The Applegate mechanism explains long term orbital period
Binary_star
Time an astronomical object takes to complete one orbit around another object
AM Canum Venaticorum 17.146 minutes Beta Lyrae AB 12.9075 days Alpha Centauri AB 79.91 years Proxima Centauri – Alpha Centauri AB 500,000 years or more
Orbital_period
Interstellar probe project
interstellar probes named Starchip, to be capable of making the journey to the Alpha Centauri star system 4.34 light-years away. It was founded in 2016 by Yuri Milner
Breakthrough_Starshot
Exoplanet candidate orbiting Proxima Centauri
Proxima Centauri c (also called Proxima c or Alpha Centauri Cc) is a disputed exoplanet candidate, proposed to be orbiting the red dwarf star Proxima
Proxima_Centauri_c
; Lopez, B.; Morel, P.; Provost, J. (June 2003). "The diameters of alpha Centauri A and B. A comparison of the asteroseismic and VINCI/VLTI views". Astronomy
List_of_exoplanet_extremes
Brightest star in Earth's night sky
the main reason for its brightness, as with other near stars such as Alpha Centauri, Procyon and Vega and in contrast to distant, highly luminous supergiants
Sirius
Proposed interstellar mission
of 2029 and to send the spacecraft at least 99% of the distance to Alpha Centauri, the nearest star system to the Sun. The proposed journey will take
Fermi_Explorer
Topics referred to by the same term
Christchurch, New Zealand Capital One, an American banking company Alpha Centauri Ab, formerly called Candidate 1 CL (disambiguation) CI (disambiguation)
C1
Brightness of a celestial object observed from the Earth
spectrum or blackbody curve as the reference. The AB magnitude zero point is defined such that an object's AB and Vega-based magnitudes will be approximately
Apparent_magnitude
star −0.74 Canopus Star −0.29 Alpha Centauri AB Binary star system Part of a triple star system with Proxima Centauri −0.05 Arcturus Star Brightest Population
List of brightest natural objects in the sky
List_of_brightest_natural_objects_in_the_sky
Aten meteoroid and near-Earth object
light discovery of 2,000+ asteroids GW250114 GRB 250702BDE Exoplanets Alpha Centauri Ab (unconfirmed) Barnard's Star b c d e BD+05 4868Ab TWA 7 b WISPIT 2b
2025_UC11
strongest evidence to date of the hypothetical Alpha Centauri Ab, a gas giant orbiting Alpha Centauri A. 8 August – Researchers at the University of Adelaide
2025_in_science
Exoplanets confirmed or discovered from direct imaging
Combination of Images Although listed in the table below, the identities of Alpha Centauri candidate 1, FW Tau b, 2MASS J044144 b, CVSO 30 c and HD 100546 b are
List of directly imaged exoplanets
List_of_directly_imaged_exoplanets
List of largest planets by size
G. Fritz (20 April 2021). "Precision millimeter astrometry of the α Centauri AB system". The Astronomical Journal. 162 (1): 14. arXiv:2104.10086. Bibcode:2021AJ
List_of_largest_exoplanets
Multiple star system in the constellation Puppis
This is comparable to the ~15000 AU separation between Alpha Centauri AB and Proxima Centauri; such wide separations between components are relatively
HD_41742_and_HD_41700
Benedict, G. Fritz (2021-07-01). "Precision Millimeter Astrometry of the Alpha Centauri AB System". The Astronomical Journal. 162 (1): 14. arXiv:2104.10086.
List of nearest stars by spectral type
List_of_nearest_stars_by_spectral_type
Septuple star system in the constellation Crux
southernmost first-magnitude star, 2.3 degrees more southerly than Alpha Centauri. This system is located at a distance of 348 light-years (106.7 parsecs)
Acrux
Red dwarf in the constellation Leo
one of the nearest stars to the Sun with only the Alpha Centauri system (including Proxima Centauri), Barnard's Star, and the brown dwarfs Luhman 16 (WISE
Wolf_359
Star at the centre of the Solar System
the triple star system Alpha Centauri, which is about 4.4 light-years away and may be in the Local Bubble's G-Cloud. Alpha Centauri A and B are a closely
Sun
Star in the constellation Dorado
This is comparable to the 15,000 AU separation between Alpha Centauri AB and Proxima Centauri. Both components of the system show considerable activity:
Zeta_Doradus
Red dwarf star in the constellation Ophiuchus
fourth-nearest-known individual star to the Sun after the three components of the Alpha Centauri system, and is the closest star in the northern celestial hemisphere
Barnard's_Star
Australian astronomer
by the Breakthrough Prize Foundation to search for planets around alpha Centauri AB by astrometry. Eureka Prize for Scientific Research, 2005 2014 CISRA/Canon
Peter_Tuthill_(astronomer)
UCSB study of fleet of small laser light sail interstellar probes
and sending them to a star neighboring the Solar System, potentially Alpha Centauri. The project aims to send organisms on board the probe. Starlight aims
Project_Starlight_(UCSB)
Asteroid
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
2021_DW1
Asteroid
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
(679648)_2019_XS
Pair of stars that appear close to each other
Gamma Leonis Gamma Andromedae Polaris Procyon Sirius Alpha Centauri system (AB) and Proxima Centauri (thus α Cen C): Actually a three-star system Alpha1
Double_star
Star in the constellation Grus
Aldhanab). Confusingly, Alnair was also given as the proper name for Zeta Centauri in an astronomical ephemerides in the middle of the 20th century. In 2016
Alpha_Gruis
German physicist
the channel BR-alpha: alpha-Centauri, Lesch & Co., Denker des Abendlandes (Thinkers of the Western World), and Alpha bis Omega (From Alpha to Omega). He
Harald_Lesch
Brightest star in the constellation Boötes
46 apparent magnitude), Canopus (−0.72) and α Centauri (combined magnitude of −0.27). However, α Centauri AB is a binary star, whose components are each
Arcturus
Binary brown dwarf system in the constellation Vela
Star in 1916, and the third-closest-known system to the Sun (after the Alpha Centauri system and Barnard's Star). The primary is of spectral type L7.5 and
Luhman_16
Star in the constellation Virgo
the Bayer designation α Virginis, which is Latinised to Alpha Virginis and abbreviated Alpha Vir or α Vir. Analysis of its parallax shows that it is located
Spica
Overview of the events of 2021 in science
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
April–June_2021_in_science
Asteroid
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
(231937)_2001_FO32
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
January–March_2021_in_science
Near-Earth asteroid
Orpheus 1994 WR12 4660 Nereus (163899) 2003 SD220 2018 AH Exoplanets Alpha Centauri Ab (unconfirmed) COCONUTS-2b Gliese 486 b HD 108236 f HD 110082 b Kepler-1704b
2021_SG
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Lists_of_stars
Closest known white dwarf star to Earth
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Sirius_B
Star in the constellation Centaurus
HR 5171, also known as V766 Centauri, is a multiple star system in the constellation Centaurus. The primary star is said to be either an extreme red supergiant
HR_5171
Brown dwarf in the constellation Hydra
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
WISE_0855−0714
Star in the constellation Ursa Major
parsecs) away it is one of the stars nearest to the Solar System; only the Alpha Centauri system, Barnard's Star, Wolf 359, and the brown dwarfs Luhman 16 and
Lalande_21185
Current system of naming exoplanets
Aa and Ab, whereas the distant star would be named B. For historical reasons, this standard is not always followed: for example Alpha Centauri A, B and
Exoplanet_naming_convention
Cancelled project of a space probe to reach 10,000 AU from the Sun
probe would be able to study the interstellar medium as well as reach Alpha Centauri. The project would require more antimatter than we are capable of producing
AIMStar
Brightest star in the constellation Aquila
night sky. It has the Bayer designation Alpha Aquilae, which is Latinised from α Aquilae and abbreviated Alpha Aql or α Aql. Altair is an A-type main-sequence
Altair
later disproved by subsequent studies, including candidates around Alpha Centauri B (4.36 ly), Kapteyn's Star (12.8 ly), Van Maanen 2 (14.1 ly), Groombridge
List_of_nearest_exoplanets
German television program
interrupted in the middle. Alpha-Centauri (science program by BR-alpha, presented by physicist Prof. Harald Lesch) Alpha bis Omega (Alpha to Omega) (discussions
Space_Night
American video game designer (1965–2024)
Elder Scrolls II: Daggerfall, Sid Meier's Pirates!, and Sid Meier's Alpha Centauri. She was the creative director for Free Realms, a massively multiplayer
Laralyn_McWilliams
make a detectable contribution. For example, the binary star system Alpha Centauri has the total or combined magnitude of −0.27, while its two component
List_of_brightest_stars
Sub-Earth exoplanet orbiting Barnard's Star
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Barnard's_Star_b
Planetary system consisting of the Sun and objects orbiting it
the triple star system Alpha Centauri, which is about 4.4 light-years away and may be in the Local Bubble's G-Cloud. Alpha Centauri A and B are a closely
Solar_System
Star in the constellation Andromeda
9,000 years, overtaking the current nearest star, the triple system Alpha Centauri. This star has about 14% of the Sun's mass and 19% of the Sun's radius
Ross_248
Nearest OB association to Earth
association; only a few stars are exceptions, such as Alpha Centauri, Gacrux, Theta Centauri and Iota Centauri, which appear in this region of the sky only due
Scorpius–Centaurus association
Scorpius–Centaurus_association
Star in the constellation Carina
62 ly), and it is the 4th-closest star system after Alpha Centauri ABC, Barnard's Star and Sirius AB; In A study of the near-by stars by Willem Jacob Luyten
Innes'_star
Hierarchical triple star system in the constellation Cygnus
constellation Cygnus, apparently inspired by the HD 188753 system. 51 Pegasi Alpha Centauri Polaris Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos
HD_188753
Moving group of stars sharing similar velocities and directions
the nearby multiple stellar systems ADS 48, ADS 6175 (Alpha Geminorum = Castor), Alpha Centauri, and ADS 9909 (Xi Scorpii)". Astronomy & Astrophysics
Castor_Moving_Group
Triple star system in the constellation Piscis Austrinus
southerly declination is not as great as that of stars such as Acrux, Alpha Centauri and Canopus, meaning that, unlike them, Fomalhaut is visible from a
Fomalhaut
Star in the constellation Sagittarius
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Ross_154
Space propulsion method using Sun radiation
the Alpha Centauri system, the ISV Venture Star, uses solar sails as a means of propulsion to accelerate the vehicle away from the Earth towards Alpha Centauri
Solar_sail
Single yellow-hued star in the constellation Cetus
systems to the Sun and the next-closest spectral class-G star after Alpha Centauri A. The radial velocity of a star is the component of its motion that
Tau_Ceti
Binary star in the constellation Cetus
1051/0004-6361/202449547. Kervella, Pierre; et al. (October 2016). "The red dwarf pair GJ65 AB: inflated, spinning twins of Proxima. Fundamental parameters from PIONIER
Gliese_65
Brightest star in the night sky
Large Magellanic Cloud, Milky Way, Carina Nebula, Hyades, Pleiades and the Alpha Persei Cluster (with Eta Carinae, Theta Tauri, Alcyone and Mirfak as the
First-magnitude_star
Subdwarf star in the constellation Pictor
that of the Sun. It may have once been part of the globular cluster Omega Centauri, itself the likely core of a dwarf galaxy swallowed up by the Milky Way
Kapteyn's_Star
Script used to write the Greek language
designated Alpha and the next brightest Beta etc. For example, the brightest star in the constellation of Centaurus is known as Alpha Centauri. For historical
Greek_alphabet
Star in the constellation Aquarius
Retrieved 2016-01-17. Paul Gilster. "Cometary Clues to the Fomalhaut System?". Centauri-dreams.org. Retrieved 2016-01-17. "ScienceShot: A 20-Million-Year Orbit"
Fomalhaut_C
Scientific projections regarding the far future
"The fate of Earth during the Sun's giant phases – New constraints from ab initio tidal modelling and AGB mass loss", Astronomy & Astrophysics, 710:
Timeline_of_the_far_future
Systematic designations to unambiguously identify astronomical objects
second brightest star in the triple star system Alpha Centauri is accordingly called Alpha Centauri Bb. If an exoplanet orbits both of the stars in a
Astronomical naming conventions
Astronomical_naming_conventions
Very small red dwarf star in the constellation Aquila
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
VB_10
Comparison of a wide range of lengths
Benedict, G. Fritz (2021). "Precision Millimetre Astrometry of the α Centauri AB System". The Astronomical Journal. 162 (1): 14. arXiv:2104.10086. Bibcode:2021AJ
Orders_of_magnitude_(length)
(1899) sees the name as originating from a misunderstanding of the words ab ireo in the description of Cygnus from Almagest. "IAU Catalog of Star Names"
List_of_proper_names_of_stars
Super-Earth orbiting Gliese 876
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Gliese_876_d
Extrasolar planet orbiting Gliese 876
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Gliese_876_b
Star system in the constellation of Indus
known planet, ε Indi Ab, with a mass of 6.31 Jupiter masses in an elliptical orbit with a period of about 171.3 years. ε Indi Ab is the second-closest
Epsilon_Indi
Star in the constellation Musca
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Gliese_440
G0 IV 539 Theta Centauri (Menkent) Centaurus 58.8 ± 0.2 2.06 K0 III 539.1 HD 122862 Apus 95.51 ± 0.07 6.02 G2/3 IV 541 Arcturus (Alpha Boötis) Boötes 36
List of Gliese and GJ objects (1-1000)
List_of_Gliese_and_GJ_objects_(1-1000)
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
List_of_nearest_bright_stars
Binary star system in the constellation Cassiopeia
period. The other components are Beta Cassiopeiae (Caph), Kappa Cassiopeiae, Alpha Cassiopeiae (Schedar) and Lambda Cassiopeiae. Consequently, the Chinese
Eta_Cassiopeiae
85 Ab B8:p Lambda Aquarii (Hydor/Shatabhisha) 365 ± 10 Aquarius M2.5 IIIa Fe–1 3.722 Alpha Antliae 366 ± 6 Antlia K4III 4.25 PDS 70 (V1032 Centauri) 366
List of star systems within 350–400 light-years
List_of_star_systems_within_350–400_light-years
Star in the constellation Ursa Major
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Groombridge_1618
1970 studio album by Kraftwerk
"Ruckzuck" as the best track of the year, ahead of Tangerine Dream’s "Alpha Centauri" and Et Cetera’s "Raga", and Can's "Halleluhwah". During his 1978 recording
Kraftwerk_(album)
NASA satellite of the Explorer program
On 23 July 2019, the discovery of the young exoplanet DS Tucanae Ab (HD 222259 Ab) in the ~45 Myr old Tucana-Horologium young moving group was published
Transiting Exoplanet Survey Satellite
Transiting_Exoplanet_Survey_Satellite
Brown dwarf in the constellation Reticulum
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
WISE_0350−5658
Red dwarf star in the constellation Cetus
a spectral type of M5.5V, this star is a red dwarf similar to Proxima Centauri. It has 12% the mass and 14% the radius of the Sun, and a temperature of
GJ_1002
Constellation in the southern celestial hemisphere
that was merged into the Milky Way, with the main remnant being the Omega Centauri globular cluster. In 2014 analysis of the doppler variations of Kapteyn's
Pictor
Confirmed terrestrial exoplanet orbiting Ross 128
kg). This is slightly more massive than the similar and nearby Proxima Centauri b, with a minimum mass of 1.27 M🜨. The low mass of Ross 128 b implies
Ross_128_b
Red dwarf star in the constellation Norma
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
2MASS_J15404342−5101357
Small star in constellation of Virgo
and so is occasionally called "Proxima Virginis" by analogy with Proxima Centauri. This low-mass star has a stellar classification of M4 V, which places
Ross_128
Star in the constellation Cetus
distance from the Sun to the Solar System's nearest neighbor, Proxima Centauri. YZ Ceti is a variable star designation: the star shows occasional rapid
YZ_Ceti
Star cluster in the Milky Way
light-years long, roughly equivalent to the distance between the Sun and Alpha Centauri, the closest star to the Sun. The areas of the nebula that appear green
DR_6_(nebula)
for Scotland. In 1839 he was the first person to measure the distance Alpha Centauri MPC · 3077 3078 Horrocks 1984 FG Jeremiah Horrocks (1619–1641), also
Meanings of minor-planet names: 3001–4000
Meanings_of_minor-planet_names:_3001–4000
Star in the constellation Aquarius
stars A-type Sirius (Alpha Canis Majoris) (8.7094±0.0054 ly) white dwarf B G-type Sun (0 ly) rest of Solar System Alpha Centauri (Rigil Kentaurus) (4
Gliese_876
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