GJ 357 d is an exoplanet , a super-earth that rotates around the habitable zone of the parent star GJ 357 , a red dwarf located 31 light years from Earth . The planetary system is in the constellation Hydra [1] [2] [3] [4] .
| Gj 357 d | |
|---|---|
| Exoplanet | |
 Planet GJ 357 d, by the artist. | |
| Parent star | |
| Star | Gj 357 |
| Constellation | Hydra |
| Right Ascension ( α ) | 09 h 36 m 01.6373 s |
| Declination ( δ ) | -21 ° 39 ′ 38.878 ″ |
| Visible magnitude ( m V ) | 10.90 |
| Distance | 30.8 St. of the year (9.44 pc ) |
| Spectral class | M2.5V |
| Elements of the orbit | |
| Semimajor axis ( a ) | 0.204 a. e. |
| Orbital Period ( P ) | 55.7 days |
| physical characteristics | |
| Radius ( r ) | ? R j |
| Discovery Information | |
| opening date | 2019 |
| Detection method | Radial velocity |
| Opening place | Tess |
| Opening status | Confirmed by |
It was discovered by a group of astronomers from the Canary Islands Institute of Astrophysics (IAC) during the observation of GJ 357, to confirm the existence of another planet, GJ 357 b, which was previously detected using satellite photometry from the Transit Exoplanet Surveillance Satellite ( TESS ) [5] . Observations led to the discovery, announced in July 2019 , of a planetary system consisting of three planets [4] [5] .
Notes
- ↑ Newly uncovered super-Earth may be habitable, and it's only 31 light-years away . Axios. Date accessed August 27, 2019.
- ↑ Francis Reddy, NASA's Goddard Space Flight Center. TESS Discovers Habitable Zone Planet in GJ 357 System (unspecified) ? . SciTechDaily (July 31, 2019). Date accessed August 27, 2019.
- ↑ Potentially habitable 'super-Earth' discovered just 31 light-years away . NBC News. Date accessed August 27, 2019.
- ↑ 1 2 Potentially habitable 'super-Earth' discovered just 31 light-years away . NBC News. Date accessed August 27, 2019.
- ↑ 1 2 B. Wohler, SX Wang, R. Vanderspeck, JD Twicken, J. Teske. Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization (Eng.) // Astronomy & Astrophysics. - 2019-08-01. - Vol. 628 . - P. A39 . - ISSN 1432-0746 0004-6361, 1432-0746 . - DOI : 10.1051 / 0004-6361 / 201935801 .