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2MASS J2117-2940
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Star 2MASS J2117-2940

Little is known about object 2MASS J2117-2940. Based on its low brightness and position it seems to be a brown dwarf or a very low-mass star.
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Sun distance
55 light years
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2MASS J2117-2940

Brown dwarf

Location +

Ascension iconRight ascension: 21h 17m 14.519s
Declination iconDeclination: -29° 40' 6.294'' (southern hemisphere)
Parallax iconParallax: 59.301
Distance iconSun distance: 55.000 ly | 16.9 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 0.7 % M Sun
| 7 M Jupiter
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Star mass
Mass of the star 2MASS J2117-2940 is 0.007 solar masses (or 7.3 Jupiter masses.)

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 14 % R Sun
| 1.4 R Jupiter
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Star size
Radius of the star 2MASS J2117-2940 is 0.14 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 1192 K | 0.21 T Sun
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Star temperature
Surface temperature of 2MASS J2117-2940 is 1192 K, which is 21 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide

Photometry

Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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2MASS J2117-2940 system structure

 2MASS J2117-2940

More about 2MASS J2117-2940

Nearby brown dwarf 2MASS J2117-2940 is approximately 10 % of the size of Sun and temperature on its surface is around 1192 K (919 °C), which is about 21 % of Sun's temperature.
       2MASS J2117-2940 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
2MASS J21171431-2940034, Gaia DR3 6787923514696999424
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External sources
gaia icon
Gaia database (Gaia DR3 6787923514696999424)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 2MASS J2117-2940 system from the Sun?

The 2MASS J2117-2940 system is 55 light years or 16.9 parsecs from the Sun.

What galaxy is the 2MASS J2117-2940 star in?

The 2MASS J2117-2940 is in the Milky Way galaxy just like the Sun.

How many stars are in the 2MASS J2117-2940 system?

The 2MASS J2117-2940 is a single star, there are no other known stars in the system.

What type of star is the 2MASS J2117-2940?

The star 2MASS J2117-2940 is a Brown dwarf star.

What temperature is star 2MASS J2117-2940?

The star 2MASS J2117-2940 has an effective temperature of 1192 K. Find out more about the temperature of stars in Stellar guide
Class of stars Brown dwarf
Brown dwarfs are not really stars, because there is no thermonuclear fusion in their core. These objects are smaller and cooler than stars, but too massive to be considered planets.
Closest stars

 HD 202940
 - 6.3 ly

WD J2141-3300
 - 6.3 ly

L 570-26
 0.6 M☉ 6.3 ly

UCAC4 325-215293
 - 8 ly

LP 927-32
 - 8.8 ly
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