Brightest Stars

Alpha Centauri, the star system closest to our sun

Star Alpha Centauri very bright against a backdrop of extremely dense field of fainter stars and dust clouds.
Alpha Centauri, the 3rd-brightest star in the sky, photographed in Coonabarabran, NSW, Australia, by Alan Dyer. A faint swarm of stars to the right is the star cluster NGC 5617. Across the field, patches of dark interstellar dust clouds obscure stars in our Milky Way Galaxy. Image via Alan Dyer/ AmazingSKY. Used with permission.

Alpha Centauri is the 3rd-brightest star in our night sky – technically a trio of stars – and the nearest star system to our sun. In fact, through a small telescope, the single star we see as Alpha Centauri resolves into a double star. This pair is just 4.37 light-years away from us. Also in orbit around them is Proxima Centauri, but it’s too faint to be visible to the unaided eye. In fact, at 4.25 light-years away, Proxima is the closest-known star to our solar system.

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Science of the Alpha Centauri system

The two sunlike stars that make up Alpha Centauri are Rigil Kentaurus and Toliman. Rigil Kentaurus, also known as Alpha Centauri A, is a yellowish star, slightly more massive than the sun and about 1.5 times brighter. Toliman, or Alpha Centauri B, has an orangish hue; it’s a bit less massive and half as bright as the sun. Studies of their mass and spectroscopic features indicate that both these stars are about 5 billion years old, slightly older than our sun.

Alpha Centauri A and B are gravitationally bound together, orbiting about a common center of mass every 79.9 years at a relatively close proximity, varying between 11.2 to 35.6 astronomical units (that is, 11.2 to 35.6 times the distance between the Earth and our sun).

Meet Proxima Centauri

In comparison, Proxima Centauri is a bit of an outlier. This dim reddish star, weighing in at just 12% of the sun’s mass, is currently about 13,000 astronomical units from Alpha Centauri A and B. Recent analysis of ground-and space-based data, published in 2017, has shown that Proxima is gravitationally bound to its bright companions, with about a 550,000-year-long orbital period.

Proxima Centauri belongs to a class of low mass stars with cooler surface temperatures, known as red dwarfs. Additionally. it’s also what’s known as a flare star, where it randomly displays sudden bursts of brightness due to strong magnetic activity.

The search for planets

So, in the past decade, astronomers have been searching for planets around the Alpha Centauri stars; they are, after all, the closest stars to us so the odds of detecting planets, if any existed, would be higher. So far, two planets have been found orbiting Proxima Centauri, one in 2016 and another in 2019. A paper published in February 2021 reported tantalizing evidence of a Neptune-sized planet around Alpha Centauri A, but so far, it has not been definitively confirmed.

Large-appearing bright star with 4 lens-effect bright spikes coming out from it.
Hubble Space Telescope image of Proxima Centauri, the closest known star to the sun. Image via Hubble/ ESA.
Extremely dense star field with 2 brights stars and a small red circle around a much smaller one.
A small red circle indicates the very faint Proxima Centauri, which is gravitationally bound to Alpha Centauri. The two bright stars are Alpha Centauri and Beta Centauri. Image via Skatebiker / Wikimedia Commons (CC BY-SA 3.0).

How to see Alpha Centauri

Unluckily for many of us in the Northern Hemisphere, Alpha Centauri is located too far south on the sky’s dome to see. So most North Americans never see it; the cut-off latitude is about 29° north, and anyone north of that is out of luck. So in the U.S. that latitudinal line passes near Houston and Orlando, but even from the Florida Keys, the star never rises more than a few degrees above the southern horizon. Things are a little better in Hawaii and Puerto Rico, where it can get 10° or 11° high.

But for observers located far enough south in the Northern Hemisphere, Alpha Centauri may be visible at roughly 1 a.m. (local DST) in early May. That is when the star is highest above the southern horizon. By early July, it reaches its highest point to the south at nightfall. Even so, from these vantage points, there are no good pointer stars to Alpha Centauri. For those south of 29° N. latitude, when the bright star Arcturus is high overhead, look to the extreme south for a glimpse of Alpha Centauri.

Star chart with stars in black on white, of Centaurus with Southern Cross constellation.
The southern constellation Centaurus. Image via Wikimedia (CC BY 3.0)/ International Astronomical Union/

Look for the Southern Cross

Observers in the tropical and subtropical regions of the Northern Hemisphere can find Alpha Centauri by first identifying the distinctive Southern Cross. A short line drawn through the crossbar (Delta and Beta Crucis) eastward first comes to Hadar (Beta Centauri), then Alpha Centauri. Meanwhile, in Australia and much of the Southern Hemisphere, Alpha Centauri is circumpolar, meaning that it never sets.

A telescope dome at in the foreground with Milky Way and bright stars in the sky.
In this image taken at the European Southern Observatory’s La Silla Observatory in Chile, the Southern Cross is clearly visible, with the yellowish star, closest to the dome, marking the top of the cross. Drawing a line downward through the crossbar stars takes you to the bluish star Beta Centauri, and then to the yellowish Alpha Centauri. Image via ESO/ Wikimedia Commons (CC BY 4.0).

The mythology of Alpha Centauri

Alpha Centauri has played a prominent role in the mythology of cultures across the Southern Hemisphere. For the Ngarrindjeri indigenous people of South Australia, Alpha and Beta Centauri were two sharks pursuing a sting ray represented by stars of the Southern Cross. Some Australian aboriginal cultures also associated stars with family relationships and marriage traditions; for instance, two stars of the Southern Cross were through to be the parents of Alpha Centauri.

Astronomy and navigation were vital in the lives of ancient seafaring Polynesians as they sailed between islands in the vast expanse of the South Pacific. These ancient mariners navigated using the stars, with cues from nature such as bird movements, waves, and wind direction. Alpha Centauri and nearby Beta Centauri, known as Kamailehope and Kamailemua, respectively, were important signposts used for orientation in the open ocean.

For ancient Incas, a llama graced the sky, traced out by stars and dark dust lanes in the Milky Way from Scorpius to the Southern Cross, with Alpha Centauri and Beta Centauri representing its eyes.

Dark-on-light shepherd, mother llama with baby, partridge, toad, and snake.
A plaque at the Coricancha museum showing Inca constellations. Coricancha, located in Cusco, Peru, was perhaps the most important temple of the Inca empire. Image via Pi3.124 / Wikimedia Commons.

Ancient Egyptians revered Alpha Centauri, and may have built temples aligned to its rising point. In southern China, it was part of a star group known as the South Gate.

How it got its name

Alpha Centauri is the brightest star in the constellation Centaurus, named after the mythical half human, half horse creature. It represented an uncharacteristically wise centaur that figured in the mythology of Heracles and Jason. Hercules accidentally wounded the centaur and placed it in the sky after death by Zeus. Alpha Centauri marked the right front hoof of the centaur, although little is known of its mythological significance, if any.

Antique etching of half-man-half-horse in field of stars in black on white.
A depiction of the Centaur by Polish astronomer Johannes Hevelius in his atlas of constellations, Firmamentum Sobiescianum, sive uranographia. Image via Wikimedia Commons (public domain).

Alpha Centauri’s position is RA: 14h 39m 36s, Dec: -60° 50′ 02″

Bottom line: Alpha Centauri is two binary stars that are sunlike stars. Plus, there’s a third star that’s gravitationally bound to them named Proxima Centauri. In fact, it’s the closest star to our sun.

Read more: Alpha Centauri planets? TOLIMAN will search

April 16, 2023
Brightest Stars

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