Universe Guide



Trappist-1 is a star that can be located in the constellation of Aquarius. It is calculated at being 1.000 Billion Years old. This information comes from ExoPlanet. Trappist-1 has alternative name(s), 2MASS J23062928-0502285 , . Trappist-1 has at least 7 Extrasolar Planets believed to be in orbit around the star.

Trappist-1 is the alternate, more familiar name to its real name. The real name is 2MASS J23062928-0502285. Its a small insignificant star in the cosmos, one you won`t be able to see if you look up at the sky. It made the news in 2017 as it had the greatest number of exo-planets in orbit round any star, seven. No other system matches it yet.

The star is a small star compared to our Sun. The years on a planet are quick, you`ll "age" far far quicker than you would here. A year is a matter of days with the sixth planet orbit its star in less than a week. Some of the planets are within the goldilocks zone which could herald possible life.

Such was N.A.S.A.`s excitement of the discovery that they have a dedicated website Trappist-1 on it. The reason for studying small stars is that they planets have a more noticable pull on the star compared to giant star and therefore easier to detect. Its not to say that giant stars don`t have planets orbiting them, they do, take for instance the star Aldebaran, it has a planet orbiting it.

Location of Trappist-1

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For Trappist-1, the location is 23h 06m 29.28 and -05 d 02` 28.5 .

Physical Properties (Age, Radius) of Trappist-1

Trappist-1 has been calculated as 0.12 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 81,408.60.km.

The star's metallicity is 0.000000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The star is believed to be about 1.00 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

Trappist-1 Apparent and Absolute Magnitudes

Trappist-1 has an apparent magnitude of 18.80 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. 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 Trappist-1

In 2007, Hipparcos data was revised with a new parallax of 83.00 which put Trappist-1 at a distance of 39.30 light years or 12.05 parsecs.

Trappist-1 Facts

Alternative Names

Traditional/Proper NameTrappist-1
Alternative Name(s)2MASS J23062928-0502285

Visual Facts

Star Type star
Age1.000 Billions of Years
Apparent Magnitude18.80
Right Ascension (R.A.)23h 06m 29.28
Declination (Dec.)-05 d 02` 28.5
2007 Revised Distance from Earth83.00 Parallax (milliarcseconds)
 39.30 Light Years
 12.05 Parsecs

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count7

Estimated Facts

Radius (x the Sun)0.12

Sources and Links


Related Stars

Location of Trappist-1 in Aquarius

Trappist-1 Location in Aquarius

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Extrasolar Planets orbiting Trappist-1

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
Trappist-1 BConfirmed0.00271.511020160.0111190.000
Trappist-1 CConfirmed0.004342.422020160.0152190.000
Trappist-1 DConfirmed0.00134.050020160.0214490.000
Trappist-1 EConfirmed0.0026.100020170.0281790.000
Trappist-1 FConfirmed0.00219.207020170.037190.000
Trappist-1 GConfirmed0.0042212.353020170.045190.000
Trappist-1 HConfirmed20.00020170.06390.000

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