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'''GJ 1151''' is a ] located in the northern ] of ] at a distance of 26.2&nbsp;]s from the ]. It has a reddish hue and is too faint to be visible to the naked eye with an ] of 14.0<ref name=Houdebine2019/> The star is moving closer with a ] of −36&nbsp;km/s,<ref name=Jeffers2018/> and has a relatively large ], traversing the ] at a rate of {{Val|1.815|ul=arcsecond}}·yr<sup>−1</sup>.<ref name=Lepine2005/> '''GJ 1151''' is a ] located in the northern ] of ] at a distance of 26.2&nbsp;]s from the ]. It has a reddish hue and is too faint to be visible to the naked eye with an ] of 14.0<ref name=Houdebine2019/> The star is moving closer with a ] of −36&nbsp;km/s,<ref name=Jeffers2018/> and has a relatively large ], traversing the ] at a rate of {{Val|1.815|ul=arcsecond}}·yr<sup>−1</sup>.<ref name=Lepine2005/>


This is a small ] star of ] dM4.5.<ref name=Houdebine2019/> It is 2.5<ref name=Mann2015/>&nbsp;billion years old and is spinning with a ] of 2.0&nbsp;km/s.<ref name=Jeffers2018/> The star has 15.4%<ref name=Mann2015/> of the ] and 19.0%<ref name=Mann2015/> of the ], with an ] of 3,143&nbsp;K.<ref name=Houdebine2019/> In 2020, astronomers announced the discovery of radio emissions from the star which are consistent with a planet, approximately the size of ], rotating in a 1-5 day long orbit.<ref name=Vedantham2020/><ref name="APJ-20200217"/><ref name="SA-20200229"/><ref name=SciNews/><ref name=Redd2020/><ref name=Clark/> This is a small ] star of ] dM4.5.<ref name=Houdebine2019/> It is 2.5<ref name=Mann2015/>&nbsp;billion years old and is spinning with a ] of 2.0&nbsp;km/s.<ref name=Jeffers2018/> The star has 15.4%<ref name=Mann2015/> of the ] and 19.0%<ref name=Mann2015/> of the ], with an ] of 3,143&nbsp;K.<ref name=Houdebine2019/>
In 2020, astronomers announced the discovery of radio emissions from the star which are consistent with a planet, approximately the size of ], rotating in a 1-5 day long orbit.<ref name=Vedantham2020/><ref name="APJ-20200217"/><ref name="SA-20200229"/><ref name=SciNews/><ref name=Redd2020/><ref name=Clark/>


==See also== ==See also==

Revision as of 18:34, 27 March 2020

GJ 1151

Imaginary diagram of GJ 1151 and GJ 1151 b.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 11 50 57.72145
Declination +48° 22′ 38.5625″
Apparent magnitude (V) 14.008
Characteristics
Spectral type dM4.5
B−V color index 1.787
Astrometry
Radial velocity (Rv)−36.01±0.28 km/s
Proper motion (μ) RA: −1,545.704 mas/yr
Dec.: −962.816 mas/yr
Parallax (π)124.4074 ± 0.1186 mas
Distance26.22 ± 0.02 ly
(8.038 ± 0.008 pc)
Absolute magnitude (MV)14.482±0.022
Details
Mass0.1540 M☉
Radius0.1903 R☉
Temperature3,143±26 K
Metallicity +0.04 dex
Rotational velocity (v sin i)2.0 km/s
Age2.5 Gyr
Other designations
GJ 1151, G 122-49, LHS 316, NLTT 28752
Database references
SIMBADdata

GJ 1151 is a star located in the northern circumpolar constellation of Ursa Major at a distance of 26.2 light years from the Sun. It has a reddish hue and is too faint to be visible to the naked eye with an apparent visual magnitude of 14.0 The star is moving closer with a radial velocity of −36 km/s, and has a relatively large proper motion, traversing the celestial sphere at a rate of 1.815″·yr.

This is a small red dwarf star of spectral type dM4.5. It is 2.5 billion years old and is spinning with a projected rotational velocity of 2.0 km/s. The star has 15.4% of the mass of the Sun and 19.0% of the Sun's radius, with an effective temperature of 3,143 K.

In 2020, astronomers announced the discovery of radio emissions from the star which are consistent with a planet, approximately the size of Earth, rotating in a 1-5 day long orbit.

See also

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Houdebine, Éric R.; et al. (August 2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 17. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. 56.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  3. ^ Mann, Andrew W.; et al. (May 2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 38. arXiv:1501.01635. Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. 64.
  4. ^ Jeffers, S. V.; et al. (June 2018). "CARMENES input catalogue of M dwarfs. III. Rotation and activity from high-resolution spectroscopic observations". Astronomy & Astrophysics. 614: 19. arXiv:1802.02102. Bibcode:2018A&A...614A..76J. doi:10.1051/0004-6361/201629599. A76.
  5. "G 122-49". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-02.
  6. Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854.
  7. Vedantham, H. K.; et al. (2020-02-17). "Coherent radio emission from a quiescent red dwarf indicative of star–planet interaction". Nature Astronomy: 1–7. Bibcode:2020NatAs.tmp...34V. doi:10.1038/s41550-020-1011-9. ISSN 2397-3366.{{cite journal}}: CS1 maint: bibcode (link)
  8. Pope, Benjamin J. S.; et al. (17 February 2020). "No Massive Companion to the Coherent Radio-emitting M Dwarf GJ 1151". The Astrophysical Journal Letters. 890 (2). arXiv:2002.07850. Bibcode:2020ApJ...890L..19P. doi:10.3847/2041-8213/ab5b99. Retrieved 1 March 2020.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  9. Starr, Michelle (29 February 2020). "For The First Time, Astronomers Have Detected an Exoplanet Using Radio Waves". ScienceAlert.com. Retrieved 1 March 2020.
  10. "Radio telescope measures aurorae in distant planetary system". UPI. Retrieved 2020-02-26.
  11. Redd, Nola Taylor. "New Exoplanet Search Strategy Claims First Discovery". Quanta Magazine. Retrieved 2020-02-26.
  12. Clark, Stuart. "An exoplanet is generating radio waves from its red dwarf sun". New Scientist. Retrieved 2020-02-26.
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