Gliese 357 d

Last updated
GJ 357 d
GJ 357 d.jpg
Discovery
Discovered by Rafael Luque, Diana Kossakowski
Discovery site TESS
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]
Star Gliese 357
Physical characteristics
Mass 6.1±1.0  M🜨 [1] 7.20±1.07 M🜨 [2]
Temperature 219.6 ± 5.9  K (−53.55 ± 5.90  °C; −64.39 ± 10.62  °F) [1]

    Gliese 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 Gliese 357, 31 light-years from the Solar System, [4] The system is part of the Hydra constellation. [4]

    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 Gliese 357 b, a “hot earth” that orbits much closer to the parent star. [6] Even though Gliese 357 d is 20% closer to Gliese 357 than Earth is to the Sun, Gliese 357 is much smaller than the Sun, receiving only as much energy as Mars. As a result, it is estimated that 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 humans traveled there using modern spacecraft, it would take them about 660,000 years to get there. [a] The planet is 6.1 times more massive than Earth and 2.3 times Earth's size. [8]

    Footnotes

    1. ↑ Calculated assuming the spacecraft travels at 14 km/s. For comparison, the New Horizons spacecraft is exiting the solar system at a velocity of 13.7 km/s as of June 2024. [7]

    References

    1. 1 2 3 4 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. arXiv: 1904.12818 . Bibcode:2019A&A...628A..39L. doi: 10.1051/0004-6361/201935801 . ISSN   0004-6361. Archived from the original on 2023-09-24. Retrieved 2020-05-12.
    2. 1 2 3 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. Archived from the original on 2019-12-18. Retrieved 2019-08-04.
    4. 1 2 3 Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System". SciTechDaily. Archived from the original on 2019-08-01. Retrieved 2019-08-01.
    5. ↑ "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. 31 July 2019. Archived from the original on 2019-07-31. Retrieved 2019-08-01.
    6. 1 2 Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Archived from the original on 2019-08-01. Retrieved 2019-08-01.
    7. ↑ Talbert, Tricia (2021-04-15). "NASA's New Horizons Reaches a Rare Space Milestone". NASA. Archived from the original on August 22, 2022. Retrieved 2021-04-18.
    8. ↑ "plot_GJ_357.png". Planetary Habitability Laboratory. 2019-09-03.
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