NASA’s planet hunter satellite gets first hit in its search for another Earth
Relocating is complicated enough when you’re simply moving to a new city. Scientists at NASA have taken property searches up an infinite number of levels, however, as they search for another Earth.
NASA’s planet-hunting team turned up a potential relocation candidate on the first pass with a new satellite. The Transiting Exoplanet Survey Satellite (TESS) uses four wide-field, 16.8MP cameras designed and built by the Massachusetts Institute of Technology’s Lincoln Laboratory to capture detailed images of stars and other objects in space. The goal is to identify previously unknown exoplanets for further study.
TESS recently began a two-year mission to scan the southern and northern skies. During the mission, TESS will study an unprecedented 85 percent of the sky — an expanse 350 times greater than NASA’s earlier Kepler mission.
The satellite observes a sector of the sky for about 27 days before moving to the next sector. The trick is to watch for drops or dips in a star’s brightness in successive images. A dip may indicate something passing in front of the star — possibly an exoplanet or a super exoplanet.
An exoplanet is a planet with roughly the same density as Earth that orbits around a star other than our Sun’s solar system. A super-exoplanet is a larger exoplanet, or “super-Earth,” with greater, but not more than 10 times the Earth’s density. Density alone doesn’t determine habitability by humans. Discovering a new exoplanet is the first step for a more complete study.
NASA announced the discovery on Twitter: “The @NASA_TESS team is excited to announce the mission’s first candidate planet — a super-Earth around the bright star Pi Mensae, nearly 60 light-years away. The planet orbits every 6.3 days. The discovery is now being reviewed by other scientists to validate it. Stay tuned!”
The @NASA_TESS team is excited to announce the mission's first candidate planet — a super-Earth around the bright star Pi Mensae, nearly 60 light-years away. The planet orbits every 6.3 days. The discovery is now being reviewed by other scientists to validate it. Stay tuned!
— NASA_TESS (@NASA_TESS) September 19, 2018
At under 60 light-years distant, the new find is much closer to Earth than the Kepler Mission’s 2015 discovery of an exoplanet named Kepler-452b — that one was 1,400 light-years away.
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Host star Pi Mensae
The dip indicates the exoplanet, Pi Mensae c
The new exoplanet, called Pi Mensae c, is about 2.14 times Earth’s radius and 4.82 times Earth’s density, Gizmodo reports, citing a paper in preprint form filed by MIT’s C. X. Huang. Preliminary indications are that Pi Mensae c has an iron core and also contains water, methane, hydrogen, and helium.
As NASA and other groups continue to study Pi Mensae c, TESS continues its search for additional exoplanets.
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