K2-72
K2-72 is a red dwarf 227.7 light years from Earth and is located in the constellation Aquarius . Four planets orbit the star , all of which are smaller than Earth, two of which - K2-72e and K2-72c - are in the habitable zone .
Names and History
K2-72 is listed under the 2MASS designation J22182923-0936444.
The star was the Kepler mission of NASA discovered a mission to extrasolar planets to find. K2-72 was found using the transit method , which measures the degree of darkening that a planet causes when it is in front of its star . Through the light that shines on the planet, with which the planets were found, the star itself was also found.
K2-72 is the seventy-second star discovered by Kepler during the K2 mission. The names b , c , d , and e go back to the order of discovery. The designation of b is given to the planet found after the star and e is given to the last.
Properties of the star
K2-72 is an M-type star which 21% of the mass and 23% of the radius of the sun has. It has a temperature of 3497 K (3224 ° C) and its age is unknown. The sun is about 4.6 billion years old and has a surface temperature of 5778 K (5500 ° C). The apparent magnitude of K2-72 is unknown.
Planetary system
The star has four planets in its system , two of which are in the habitable zone . These are called K2-72e and K2-72c . All are smaller than the earth.
| Planets in the system | Dimensions | Semi-axis
(AU) |
Orbital time
(Days) |
eccentricity | Tilt | radius |
|---|---|---|---|---|---|---|
| K2-72b | - | 0.037 | 5.5774 | - | - | 0.75 ± 0.20 R ⊕ |
| K2-72d | - | 0.046 | 7.76 | - | - | 0.76 ± 0.20 R ⊕ |
| K2-72c | - | 0.0722 | 15.1871 | - | - | 0.86 ± 0.22 R ⊕ |
| K2-72e | - | 0.098 | 24.1669 | - | - | 0.82 ± 0.22 R ⊕ |
See also
Web links
- Entry K2-72 in the NASA Exoplanet Archive (English)