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.
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 .
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.
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.
Teegarden's Star has a spectral type of M6.5 V. This means the star is a red main sequence star.
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 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.
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.
|Primary / Proper / Traditional Name||Teegarden's Star|
|Spectral Type||M6.5 V|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||Main Sequence Dwarf Star|
|Visual / Apparent Magnitude||15.13|
|Naked Eye Visible||Requires 8m Telescope - Magnitudes|
|Right Ascension (R.A.)||2h 53m 0.85|
|Declination (Dec.)||+16 ° 52` 53.3|
|Distance from Earth||261.01 Parallax (milliarcseconds)|
|12.50 Light Years|
|789,988.70 Astronomical Units|
|Proper Motion Dec.||3429.53 milliarcseconds/year|
|Proper Motion RA.||-3806.16 milliarcseconds/year|
|Radial Velocity||63.00 km/s|
|Radius (x the Sun)||0.11|
The map was generated using Stellarium, an awesome free application.
|Name||Status||Mass (Jupiters)||Orbital Period (Days)||Eccentricity||Discovered||Semi-Major Axis||Periastron|
There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.
You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.
|Buttered Cat||Tuesday, 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 pascoa||Thursday, 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 Guy||Saturday, 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.|