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586 K (313 °C, 595 °F) LHS 475 b is a terrestrial planet orbiting the star LHS 475 which is about 40.7 light years away, in the constellation of Octans. [2][3] It was the first extrasolar planet to be confirmed by the James Webb Space Telescope. [4] It completes an orbit every 2 days and is 99% the diameter of Earth.
Webb operates in a halo orbit, circling around a point in space known as the Sun–Earth L 2 Lagrange point, approximately 1,500,000 km (930,000 mi) beyond Earth's orbit around the Sun. Its actual position varies between about 250,000 and 832,000 km (155,000–517,000 mi) from L 2 as it orbits, keeping it out of both Earth and Moon's shadow.
LHS 475 b is close in size to Earth, at 99% its diameter, but is much hotter, with an equilibrium temperature of 586 K (313 °C; 595 °F). Assuming the planet has little to no atmosphere, its dayside temperature is estimated at 748 K (475 °C; 887 °F). The planet completes an orbit around its star in just two days and is likely tidally locked.
The Webb telescope is the only operating telescope that is capable of characterizing the atmosphere of Earth-sized exoplanets. Attempts to assess LHS 475 b's atmosphere have been made by analyzing ...
Scientists have spotted a strange new world.It's almost exactly the size of Earth. It's rocky. It's relatively close (41 light-years away). And, for the first time, astronomers used the most ...
Study marks first detection of any form of light emitted by an exoplanet as small as rocky planets in our own solar system
Webb's First Deep Field was taken by the telescope's Near-Infrared Camera (NIRCam) and is a composite produced from images at different wavelengths, totalling 12.5 hours of exposure time. [3] [4] SMACS 0723 is a galaxy cluster visible from Earth's Southern Hemisphere, [5] and has often been examined by Hubble and other telescopes in search of ...
The Webb data also did not make clear the thickness of the atmosphere. Hu said it could be as thick as Earth's or even thicker than that of Venus, whose toxic atmosphere is the densest in our ...