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TRAPPIST-1
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Star TRAPPIST-1

Red dwarf TRAPPIST-1 is located 41 light years away from the Sun. It is a single star of spectral class M7.5e, that has 9 % of solar mass. There are multiple known exoplanets in this system.
Sun distance
41 light years
galaxy map

TRAPPIST-1

Red dwarf (spectral class M7.5e)

Location

Ascension iconRight ascension: 23h 6m 30.37s
Declination iconDeclination: -5° 2' 36.702'' (equatorial region)
Parallax iconParallax: 80.212
Distance iconSun distance: 40.662 ly | 12.5 pc

Basic characteristic

icon weight
Mass: 8.98 % M Sun | 94 M Jupiter
radius icon
Size: 11.9 % R Sun | 1.2 R Jupiter
temperature iconTemperature: 2400 K | 0.42 T Sun
time iconAge: 7.6 billions years | 1.65 Sun
luminosity iconLuminosity: 0.000553 L Sun

8 exoplanets

 TRAPPIST-1 n/a -
TRAPPIST-1 b 0.01 AU 0.9 M⊕ 1.1 R⊕ 1.5 days
TRAPPIST-1 c 0.02 AU 1.4 M⊕ 1.1 R⊕ 2.4 days
TRAPPIST-1 d 0.02 AU 0.4 M⊕ 0.8 R⊕ 4 days
TRAPPIST-1 e 0.03 AU 0.7 M⊕ 0.9 R⊕ 6.1 days
TRAPPIST-1 f 0.04 AU 0.7 M⊕ 1 R⊕ 9.2 days
TRAPPIST-1 g 0.05 AU 1.3 M⊕ 1.1 R⊕ 12.4 days
TRAPPIST-1 h 0.06 AU 0.3 M⊕ 0.8 R⊕ 20 days

Photometry

Magnitude iconApparent magnitude (V): 18.8
Magnitude iconAbsolute magnitude (V): 18.3
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
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
More about TRAPPIST-1
Nearby star TRAPPIST-1 is approximately 10 % of the size of Sun and temperature on its surface is around 2400 K (2127 °C), which is about 42 % of Sun's temperature.
      TRAPPIST-1 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 J23062928-0502285, 2MASSI J2306292-050227, 2MASSW J2306292-050227, 2MUDC 12171, K2-112, TIC 278892590, WISEA J230630.02-050234.1, EPIC 200164267, Gaia EDR3 2635476908753563008
External sources
icon study
The Carbon-Deficient Evolution of TRAPPIST-1c
Scientific study, Accepted: 29. 11. 2023
icon study
Impact of Cosmic Rays on Atmospheric Ion Chemistry and Spectral Transmission Features of TRAPPIST-1e
Scientific study, Accepted: 08. 11. 2023
icon study
Atmospheric Reconnaissance of TRAPPIST-1 b with JWST/NIRISS: Evidence for Strong Stellar Contamination in the Transmission Spectra
Scientific study, Accepted: 13. 09. 2023
icon study
Composition constraints of the TRAPPIST-1 planets from their formation
Scientific study, Accepted: 11. 07. 2023
simbad icon
Simbad database (TRAPPIST-1)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2635476908753563008)
Archive from the Gaia mission
Class of stars Red dwarf
Red dwarfs are small reddish stars, that are by far the most common type of star in solar neighborhood. Their mass is usually between 10 and 50 % of solar mass.
Closest stars

 HD 216133
 - 7.5 ly

2MASS J2224-0158
 - 7.9 ly

Wolf 1039
 - 8.3 ly

Wolf 1561
 - 9.7 ly

Gliese 4281
 - 9.7 ly
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