GJ 357 d

GJ 357 d is an exoplanet, considered to be a "Super-Earth" within the circumstellar habitable zone of its parent star.[3][4][5][6] The planet orbits GJ 357, 31 light-years from our Solar System,[4] The system is part of the Hydra constellation.[4]

GJ 357 d
Discovery
Discovered byRafael Luque, Diana Kossakowski
Discovery siteTESS
Discovery date2019
Radial velocity
Orbital characteristics
0.204±0.015 AU[1]
Eccentricity≈0.033 ± 0.057[2]
55.70±0.05 d[1]
Inclination<40°[2]
Physical characteristics
Mass6.1±1.0 M⊕[1] 7.20±1.07 M⊕[2]
Temperature219.6 ± 5.9 K (−53.55 ± 5.90 °C; −64.39 ± 10.62 °F)[1]

    The planet was discovered by the TESS team and announced in July 2019. The data confirming the presence of the planet was uncovered in ground based observation dating back to 1998 while confirming the TESS detection of GJ 357 b, a “hot earth” that orbits much closer to the parent star.[6] Even though GJ 357d is 20% closer GJ 357 than earth is to the Sun GJ 357 is much smaller than the Sun. So it receives as much energy as Mars. As a result it is estimated the average temperature is -64°F (-53°C) but this temperature is survivable for humans,if there is a thick enough atmosphere the actual temperature could be much higher. If you traveled there using modern spacecraft,it would take you about 660,000 years to get there. The planet is 6 times more massive than earth and twice Earth's size

    References
    1. Luque, R.; Pallé, E.; et al. (2019). "Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization". Astronomy & Astrophysics. 628: A39. doi:10.1051/0004-6361/201935801. ISSN 0004-6361.
    2. Jenkins, J S; Pozuelos, F J; et al. (2019). "GJ 357: a low-mass planetary system uncovered by precision radial velocities and dynamical simulations". Monthly Notices of the Royal Astronomical Society. 490 (4): 5585–5595. arXiv:1909.00831. doi:10.1093/mnras/stz2937. ISSN 0035-8711.
    3. Falconer, Rebecca (2019-08-01). "Newly uncovered super-Earth 31 light-years away may be habitable". Axios.
    4. Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System". SciTechDaily. Retrieved 2019-08-01.
    5. "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. Retrieved 2019-08-01.
    6. Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Retrieved 2019-08-01.
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