51 Eridani ( lat. 51 Eridani , c Eridani ) - the star in the constellation Eridani . It is located at a distance of 95.8 light years from the sun. At least one planet is drawn around the star.
| 51 Eridani | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 95,8 of St. years (29.4 pc ) [1] | ||
| Visible magnitude ( V ) | |||
| Constellation | Eridan | ||
| Astrometry | |||
| Radial velocity ( R v ) | 12.60 [2] km / s | ||
| Proper motion (μ) | RA: 44.22 [2] Dec: -64.39 [2] | ||
| Parallax (π) | 33.98 ± 0.34 [2] mas | ||
| Specifications | |||
| Spectral class | F0IV [2] | ||
| physical characteristics | |||
| Weight | 1.75 ± 0.05 [1] M ☉ | ||
| Age | 20 ± 6 million [1] years | ||
| Temperature | 7331 ± 30 [3] K | ||
| Luminosity | 0.85 [3] L ☉ | ||
| Metallicity | [Fe / H] = - 0.027 [1] | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Characteristics
51 Eridanus is a young star about 20 million years old. [1] . This is a yellow-white subgiant , having a mass equal to 1.75 solar masses, and luminosity - 85% of the luminosity of the sun. The surface temperature of the star is approximately 7331 Kelvin [3] . 51 Eridanus belongs to the moving group of stars of the painter's β , the members of which are united among themselves by a common direction of movement and origin [5] .
Planetary system
In 2015, in the 51 Eridani system, a group of astronomers discovered [1] a planet similar to Jupiter at an early stage of its formation. Scientists were able to directly make her pictures with the help of telescopes Keck Observatory, located on the island of Hawaii , USA . Spectral analysis showed that the planet is much more "red" than brown dwarfs similar to it. The effective temperature of the planet is 605–737 Kelvin. [3]
| Planet | Weight ( M J ) | Radius ( R j ) | Period of treatment ( days ) | Big axis orbits ( a. e ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 9.1 | 1.11 | 14965 | 14 | 0.21 |
Notes
- ↑ 1 2 3 4 5 6 B. Macintosh et al. Jovian planet 51 Eri b with the Gemini Planet Imager (Eng.) . Arxiv.org (Oct 9 2015). The appeal date is June 9, 2017.
- ↑ 1 2 3 4 5 6 SIMBAD (English) . - 51 Eridanus in SIMBAD database . The appeal date is June 9, 2017.
- ↑ 1 2 3 4 Abhijith Rajan et al. Characterizing 51 Eri b from 1-5 μm: a partly-cloudy exoplanet (eng.) . Arxiv.org (10 May 2017). The appeal date is June 9, 2017.
- ↑ SIMBAD Astronomical Database
- ↑ Eric E. Mamajek, Cameron PM Bell. On the age of the β Pictoris moving group (English) . Arxiv.org (Sep 9, 2014). The appeal date is June 9, 2017.
See also
- List of stars in the constellation Eridani
Links
- 51 Eridanus in the Encyclopedia of extrasolar planets (eng.)
- Newly discovered, the solar system is much like our own . The Washington Post (13 August 2015). The appeal date is June 9, 2017.