Universe Guide

Teegarden's Star

Teegarden's Star Facts

Information on Teegarden's Star

The star was discovered in 2003 by a team at National Aeronautics and Space Administration (N.A.S.A.). Bronnard Teegarden was the team leader of the group that found it and so it was named after him. It is a faint brown Dwarf Star which explains why it took so long in discovering it. It is one of the closest stars to our own and is the first Brown Dwarf that was discovered within 20 light years of us.

It is a small faint star that you would need a large telescope to see even though it is one of our closest stars. In June 2019, it was revealed in a paper that two planets have been discovered in orbit round the star. Both planets whizz you the star in a matter of days compared to Earth.

The paper that was written about the discovery can be read at Astronomy and Astrophysics.

Location of Teegarden's Star

The location of the main sequence star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. For Teegarden's Star, the location is 2h 53m 0.85 and +16 ° 52` 53.3 .

Radial Velocity and Proper Motion of Teegarden's Star

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving 3,429.53 milliarcseconds/year towards the north and -3,806.16 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 63.00 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Radius) of Teegarden's Star

Teegarden's Star Colour and Temperature

Teegarden's Star has a spectral type of M6.5 V. This means the star is a red main sequence star.

Teegarden's Star Radius

Teegarden's Star has been calculated as 0.11 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 74,450.60.km. If you need the diameter of the star, you just need to multiple the radius by 2.

Teegarden's Star Apparent and Absolute Magnitudes

Teegarden's Star has an apparent magnitude of 15.13 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 17.21 Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Teegarden's Star

The Parallax of the star is given as 261.01 which gives a calculated distance to Teegarden's Star of 12.50 light years from the Earth or 3.83 parsecs. It would take a spaceship travelling at the speed of light, 12.50 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 789,988.70 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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Additional Teegarden's Star Facts and Figures

Visual Facts

Primary / Proper / Traditional NameTeegarden's Star
Spectral TypeM6.5 V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Absolute Magnitude 17.21
Visual / Apparent Magnitude15.13
Naked Eye VisibleRequires 8m Telescope - Magnitudes
Right Ascension (R.A.)2h 53m 0.85
Declination (Dec.)+16 ° 52` 53.3
Distance from Earth261.01 Parallax (milliarcseconds)
 12.50 Light Years
 3.83 Parsecs
 789,988.70 Astronomical Units
Proper Motion Dec.3429.53 milliarcseconds/year
Proper Motion RA.-3806.16 milliarcseconds/year
Radial Velocity63.00 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count2

Estimated Calculated Facts

Radius (x the Sun)0.11

Location of Teegarden's Star in Aries

Teegarden's Star Location in Aries

The map was generated using Stellarium, an awesome free application.

List of Extrasolar Planets orbiting Teegarden's Star

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Teegarden's bConfirmed0.00334.9100.020190.025277.000
Teegarden's cConfirmed0.0034911.4090.020190.0443286.000

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Comments and Questions

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Buttered CatTuesday, 25th June 2019 3:37:32 PM
Why? Trappist-1 star is smaller and nobody doubts that its planets can have an atmosphere.
Joao Alberto Sardo pascoaThursday, 20th June 2019 8:54:59 AM
Teegarden star is little diameter high than Jupiter planet 148,000 km vs 142,000 km. That means it's high massive. It's possible that fusion reactions are unstable to allow atmosphere in those two planets.
Handy GuySaturday, 10th August 2019 2:16:05 AM
Fantastic! A stable, little 8 billion year old M type red star. Life needs habitable conditions and TIME. Life may be more possible and likely in the Teegarden System than here! Is it possible that small red stars tend to flare violently in their relative youth, due to an economy of scale? The gaseous overburden covering the fusion core is relatively thin, so violent flares can push their way out of small red stars more easily? Perhaps? Where's a Stargate when you need one.
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