Best image of Alpha Centauri A and B

The closest star system to the Earth is the famous Alpha Centauri group. Located in the constellation of Centaurus (The Centaur), at a distance of 4.3 light-years, this system is made up of the binary formed by the stars Alpha Centauri A and Alpha Centauri B, plus the faint red dwarf Alpha Centauri C, also known as Proxima Centauri.

The NASA/ESA Hubble Space Telescope has given us this stunning view of the bright Alpha Centauri A (on the left) and Alpha Centauri B (on the right), flashing like huge cosmic headlamps in the dark. The image was captured by the Wide Field and Planetary Camera 2 (WFPC2). WFPC2 was Hubble’s most used instrument for the first 13 years of the space telescope’s life, being replaced in 2009 by WFC3 during Servicing Mission 4. This portrait of Alpha Centauri was produced by observations carried out at optical and near-infrared wavelengths.

Compared to the Sun, Alpha Centauri A is of the same stellar type G2, and slightly bigger, while Alpha Centauri B, a K1-type star, is slightly smaller. They orbit a common centre of gravity once every 80 years, with a minimum distance of about 11 times the distance between the Earth and the Sun. Because these two stars are, together with their sibling Proxima Centauri, the closest to Earth, they are among the best studied by astronomers. And they are also among the prime targets in the hunt for habitable exoplanets. Using the HARPS instrument astronomers already discovered a planet orbiting Alpha Centauri B. 24 August 2016 astronomers announced the discovery of an Earth-like planet in the habitable zone orbiting the star Proxima Centauri.

Links:

Credit:

ESA/Hubble & NASA

About the Image

Id:potw1635a
Type:Observation
Release date:29 August 2016, 06:00
Size:1026 x 670 px

About the Object

Name:Alpha Centauri
Type:Milky Way : Star : Spectral Type : G
Milky Way : Star : Spectral Type : K
Milky Way : Star : Grouping : Binary
Distance:4 light years
Constellation:Centaurus
Category:Stars

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Coordinates

Position (RA):14 39 37.08
Position (Dec):-60° 48' 56.29"
Field of view:0.85 x 0.56 arcminutes
Orientation:North is 49.6° left of vertical

Colours & filters

BandWavelengthTelescope
Optical
B
457 nm Hubble Space Telescope
WFPC2
Infrared
R
850 nm Hubble Space Telescope
WFPC2

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