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Stellar Catalog
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Nearby stars catalogue
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K2-18
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Star K2-18

Red dwarf K2-18 is located 124 light years away from the Sun. It is a single star of spectral class M2.8, that has 41 % of solar mass. There are multiple known exoplanets in this system.
Sun distance
124 light years

K2-18

Red dwarf (spectral class M2.8)

Location

Ascension iconRight ascension: 11h 30m 14.433s
Declination iconDeclination: 7° 35' 16.127'' (equatorial region)
Parallax iconParallax: 26.247
Distance iconSun distance: 124.265 ly | 38.1 pc

Basic characteristic

icon weight
Mass: 41.3 % M Sun | 433 M Jupiter
radius icon
Size: 39 % R Sun | 3.9 R Jupiter
temperature iconTemperature: 3464 K | 0.6 T Sun

2 exoplanets

K2-18 c 0.07 AU 5.6 M 9 days
K2-18 b 0.16 AU 8.6 M 2.6 R 32.9 days

Photometry

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 K2-18
Star K2-18 is approximately 40 % of the size of Sun and temperature on its surface is around 3464 K (3191 °C), which is about 60 % of Sun's temperature.
      K2-18 can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope. 
Other designations of this star
EPIC 201912552, 2MASS J11301450+0735180, UCAC4 488-054338, TOI 5555
External sources
icon study
Distinguishing oceans of water from magma on mini-Neptune K2-18b
Scientific study, Accepted: 11. 01. 2024
tess icon
TESS database (TOI 5555.01)
Archive from the TESS 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.
News from this star system
Article image:

New type of hot ocean exoplanets could be our best chance of finding extraterrestrial life

According to a new study hot exoplanets with oceans and hydrogen atmospheres could be the first place where we will find new life. There could be more of them than Earth-like exoplanets and it is easier to observe them, than smaller rocky objects.

Article image:

Water vapor discovered in the atmosphere of the exoplanet K2-18b

Exoplanet K2-18b, discovered in 2015 with Kepler telescope, is twice as big as Earth - but 9 times more massive. It orbits its star in habitable zone and apparently has water in its atmosphere. It is the smallest exoplanet with detected water vapor in the habitable zone of a star.

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