Kepler-20 d (KOI-70 c, KIC 6850504 s, 2MASS J19104752 + 4220194 s [2] ) is one of the five exoplanets of the star Kepler-20 in the constellation Lyra. [3] [4] The exoplanet belongs to the class of Hot Neptunes with an estimated surface temperature of 369 Kelvin.
| Kepler-20 d | |
|---|---|
| Exoplanet | |
| Parent star | |
| Star | Kepler-20 (KOI-070) |
| Constellation | Lyra |
| Right Ascension ( α ) | 19 h 10 m 47.524 s |
| Declination ( δ ) | + 42 ° 20 ′ 19.30 ″ |
| Visible magnitude ( m V ) | 12.51 |
| Distance | 945 St. years old ( 290 ± 30 pc ) |
| Spectral class | G8 |
| Weight ( m ) | 0.912 ± 0.035 M ☉ |
| Radius ( r ) | 0.944 +0.06 −0.095 R ☉ |
| Temperature ( T ) | 5,466 ± 93 K |
| Metallicity ([Fe / H]) | 0.02 ± 0.04 |
| Age | 8.8 +4.7 −2.7 billion years |
| Elements of the orbit | |
| Semimajor axis ( a ) | 0.3453 a. e. |
| Eccentricity ( e ) | <0.60 |
| Orbital Period ( P ) | 77.61184 d. |
| Inclination ( i ) | 89.570 ° |
| physical characteristics | |
| Weight ( m ) | <20.1 M ⊕ |
| Radius ( r ) | 2.75 +0.17 −0.30 R ⊕ |
| Density ( ρ ) | <4.07 g / cm 3 |
| Temperature ( T ) | 369 K |
| Discovery Information | |
| opening date | December 20, 2011 |
| Detection method | Transit |
| Opening place | Kepler telescope |
| Opening status | Published [1] |
| Other designations | |
| KOI-70 d, KIC 6850504 d, 2MASS J19104752 + 4220194 d [2] | |
The existence of this exoplanet was announced on December 20, 2011 . [1] [4]
Content
Native Star
The star Kepler-20, also known as GSC 03129-01902, belongs to the stars of the spectral class G8. The star is located 945 light-years from Earth in the constellation Lyra. At least five planets revolve around the star, two of which are comparable in size to the Earth [3] [4]
The star in its characteristics resembles our Sun. Its mass and radius are 91% and 94% of the solar, respectively. The surface temperature is about 5466 Kelvin , which is comparable to the temperature of our daylight. The luminosity of a star is 85% of the sun. The star was named Kepler-20 , because it was discovered using planetary telescope Kepler planetary companions. [3] [4]
See also
- Kepler-20
- List of exoplanets discovered in 2011
- List of exoplanets discovered by the Kepler telescope
- Kepler (telescope)
Notes
- ↑ 1 2 1201.5424v1, 2012 .
- ↑ 1 2 NASA Exoplanet Archive .
- ↑ 1 2 3 1112.4514v2, 2012 .
- ↑ 1 2 3 4 1102.0541v2, 2011 .
Literature
- Michael Perryman Part 6. Transits // The Exoplanet Handbook . - Cambridge University Press , 2011 .-- pp. 103-114. - 424 p. - ISBN 9780521765596 . Archived July 21, 2013 to Wayback Machine
Articles
- Thomas N. Gautier III et all. Kepler-20: A Sun-like Star with Three Sub-Neptune Exoplanets and Two Earth-size Candidates . - 2012. - arXiv : 1112.4514v2 .
- William J. Borucki. Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data . - 2011 .-- arXiv : 1102.0541v2 .
- Stephen R. Kane, Dawn M. Gelino. Decoupling Phase Variations in Multi-Planet Systems (Eng.) // The Astrophysical Journal . - 2012. - arXiv : 1211.6747v1 .
- Jack J. Lissauer. Almost All of Kepler's Multiple Planet Candidates are Planets . - 2012. - arXiv : 1201.5424v1 .
Links
- NASA's Kepler announces 11 planetary systems hosting 26 planets Ames Research Center. Archived July 10, 2013.
Directories
- Kepler-20 d (English) . exoplanets.org. Archived July 10, 2013.
- Kepler-20 d (English) (inaccessible link) . Open Exoplanet Catalog. Archived July 10, 2013.
- Kepler-20 d (English) . Ames Research Center. Archived July 10, 2013.
- Kepler-20 d (English) . NASA Exoplanet Archive. Archived July 10, 2013.
- Kepler-20 d (English) . SIMBAD Archived July 10, 2013.