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Gliese 1061 is a red dwarf star located approximately 12 light-years from Earth in the southern constellation of Horologium. Even though it is a relatively nearby star it has an apparent visual magnitude of about 13 so it can only be seen with at least a moderately-sized telescope.
Gliese 436 is a red dwarf approximately 31.8 light-years away in the zodiac constellation of Leo. It has an apparent visual magnitude of 10.67, which is much too faint to be seen with the naked eye. However, it can be viewed with even a modest telescope of 2.4 in (6 cm) aperture. In 2004, the existence of an extrasolar planet, Gliese 436b, was verified as orbiting the star. This planet was later discovered to transit its host star.
Gliese 581 is a star of spectral type M3V at the center of the Gliese 581 planetary system, about 20 light years away from Earth in the Libra constellation. Its estimated mass is about a third of that of the Sun, and it is the 89th closest known star to the Sun. Gliese 581 is one of the oldest, least active M dwarfs, its low stellar activity bodes better than most for its planets retaining significant atmospheres and from the sterilising impact of stellar flares.
Gliese 667 is a triple-star system in the constellation Scorpius lying at a distance of about 6.8 pc from Earth. All three of the stars have masses smaller than the Sun. There is a 12th magnitude star close to the other three, but it is not gravitationally bound to the system. To the naked eye, the system appears to be a single faint star of magnitude 5.89.
Gliese 436 b is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. It was the first hot Neptune discovered with certainty and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.
Gliese 849, or GJ 849, is a small, solitary star in the equatorial constellation of Aquarius. It has a reddish hue and is invisible to the naked eye with an apparent visual magnitude of 10.41. The distance to this star is 28.7 light years based on parallax, but it is drifting closer to the Sun with a radial velocity of −15.3 km/s. It has a pair of confirmed gas giant companions.
Gliese 176 is a red dwarf in the constellation of Taurus. Based upon parallax measurements from the Hipparcos mission, it is located approximately 30 light-years away. The star is orbited by a Super-Earth.
Gliese 176 b is a super-Earth exoplanet approximately 31 light years away in the constellation of Taurus. This planet orbits very close to its parent red dwarf star Gliese 176.
Gliese 676 is a 10th-magnitude wide binary system of red dwarfs that has an estimated minimum separation of 800 AU with an orbital period of greater than 20,000 years. It is located approximately 54 light years away in the constellation Ara. In 2009, a gas giant was found in orbit around the primary star, in addition to its confirmation in 2011 there was also a strong indication of a companion; the second gas giant was characterised in 2012, along with two much smaller planets.
Gliese 221 is an K-type main-sequence star-red dwarf star 66 light years from Earth. It is depleted in heavy elements, containing just 46% of solar abundance of iron. But this star cannot be seen with the naked eye from the globe
Gliese 180, is a small red dwarf star in the equatorial constellation of Eridanus. It is invisible to the naked eye with an apparent visual magnitude of 10.9. The star is located at a distance of 39 light years from the Sun based on parallax, and is drifting closer with a radial velocity of −14.6 km/s. It has a high proper motion, traversing the sky at the rate of 0.765 arcseconds per year.
Gliese 15 Ab, also commonly called Groombridge 34 Ab, is an extrasolar planet approximately 11 light-years away in the constellation of Andromeda. It is found in the night sky orbiting the star Gliese 15 A, which is at right ascension 00h 18m 22.89s and declination +44° 01′ 22.6″.
GJ 625 is a red dwarf star of spectral type M2.0V, located in the constellation Draco, 21.1 light-years from Earth.
Mikko Tuomi is a Finnish astronomer from the University of Hertfordshire, most known for his contributions to the discovery of a number of exoplanets, among them the Proxima Centauri b which orbits the closest star to the Sun. Mikko Tuomi was the first to find indications of the existence of Proxima Centauri b in archival observation data. Other exoplanets to whose discovery or study Tuomi has contributed include HD 40307, HD 154857 c, Kapteyn c, Gliese 682 c, HD 154857, Gliese 221, Gliese 581 g and the planetary system orbiting Tau Ceti. He has led the development of new data analysis techniques for distinguishing observations caused by natural activity of the star and those caused by planets orbiting them.
GJ 357 is an M-type main sequence star with an unusually low starspot activity. It is located 31 light-years from the Solar System.
Gliese 357 d is an exoplanet, considered to be a "Super-Earth" within the circumstellar habitable zone of its parent star. The planet orbits GJ 357, 31 light-years from our Solar System, The system is part of the Hydra constellation.
Gliese 15 Ac is an exoplanet orbiting the nearby red dwarf star Gliese 15 A, which is part of a binary star system located about 11.6 light-years from the Sun. The planet was first proposed in October 2017 using radial velocity data from the CARMENES spectrograph, combined with measurements from the HARPS and HIRES spectrographs, and its existence was confirmed in April 2018 using HARPS-N data. It has a minimum mass 36 times that of Earth and orbits at around 5.4 astronomical units with a period of 7,600 days, an orbit which may have been sculpted by interaction with the companion star, Gliese 15 B. As of 2020, Gliese 15 Ac is the longest-period sub-Jovian planet discovered by radial velocity.
References
- 1 2 3 "Planet GJ 536 b". exoplanet.eu. Archived from the original on 2016-11-21. Retrieved 2016-11-19.
- 1 2 "CONFIRMED PLANET OVERVIEW PAGE". Nasa Exoplanet Archive. Retrieved 2016-11-19.
- 1 2 Suárez Mascareño, A.; et al. (2017). "A super-Earth orbiting the nearby M dwarf GJ 536". Astronomy and Astrophysics. 597. A108. arXiv: 1611.02122 . Bibcode:2017A&A...597A.108S. doi:10.1051/0004-6361/201629291.
- 1 2 3 4 5 Trifonov, Trifon; Kürster, Martin; Zechmeister, Mathias; Tal-Or, Lev; Caballero, José A.; Quirrenbach, Andreas; Amado, Pedro J.; Ribas, Ignasi; Reiners, Ansgar; et al. (2018). "The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems". Astronomy and Astrophysics. 609. A117. arXiv: 1710.01595 . Bibcode:2018A&A...609A.117T. doi:10.1051/0004-6361/201731442. S2CID 119340839.
- 1 2 3 "Scientists discover a nearby 'super-Earth' Its short orbital period could help with future studies of biological activity". Science Daily. Retrieved 19 November 2016.
- 1 2 "Scientists discover a nearby superearth". Phys.org. Retrieved 19 November 2016.
- ↑ "Gliese 536b: Super-Earth Found Orbiting Nearby Star | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2018-02-11.
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