GJ 3512

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GJ 3512
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension  08h 41m 20.1289s[1]
Declination +59° 29′ 50.445″[1]
Apparent magnitude (V) +15.05[2]
Evolutionary stage Red dwarf
Spectral type M5.70[3]
Radial velocity (Rv)8[4] km/s
Proper motion (μ) RA: −260.421[1] mas/yr
Dec.: −1279.613[1] mas/yr
Parallax (π)105.3856 ± 0.0944[1] mas
Distance30.95 ± 0.03 ly
(9.489 ± 0.008 pc)
Mass0.117[5] M
Radius0.166[5] R
Luminosity0.00083[6] L
Temperature2,844[6] K
Metallicity [Fe/H]+0.02[3] dex
Rotational velocity (v sin i)2.0[7] km/s
Other designations
2MASS J08412013+5929505, G 234-45
Database references

GJ 3512 is a red dwarf star 31 light years from the Sun that is orbited by a gas giant. GJ 3512 has a mass of roughly 0.12 solar masses and its companion GJ 3512b has a minimum mass of 0.46 Jupiter masses. The star's mass is only 250 times that of the gas giant, calling into question traditional models of planetary formation.[8][9]

See also[edit]


  1. ^ a b c d e 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. ^ Weis, Edward W. (1996). "Photometry of Stars with Large Proper Motion". The Astronomical Journal. 112: 2300. Bibcode:1996AJ....112.2300W. doi:10.1086/118183.
  3. ^ a b Terrien, Ryan C.; Mahadevan, Suvrath; Bender, Chad F.; Deshpande, Rohit; Robertson, Paul (2015). "M Dwarf Luminosity, Radius, and α-enrichment from I-band Spectral Features". The Astrophysical Journal. 802 (1): L10. Bibcode:2015ApJ...802L..10T. doi:10.1088/2041-8205/802/1/L10.
  4. ^ Newton, Elisabeth R.; Charbonneau, David; Irwin, Jonathan; Berta-Thompson, Zachory K.; Rojas-Ayala, Barbara; Covey, Kevin; Lloyd, James P. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1): 20. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20.
  5. ^ a b Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason A.; West, Andrew A. (2016). "The Rotation and Galactic Kinematics of Mid M Dwarfs in the Solar Neighborhood". The Astrophysical Journal. 821 (2): 93. Bibcode:2016ApJ...821...93N. doi:10.3847/0004-637X/821/2/93.
  6. ^ a b Newton, Elisabeth R.; Charbonneau, David; Irwin, Jonathan; Mann, Andrew W. (2015). "An Empirical Calibration to Estimate Cool Dwarf Fundamental Parameters from H-band Spectra". The Astrophysical Journal. 800 (2): 85. Bibcode:2015ApJ...800...85N. doi:10.1088/0004-637X/800/2/85.
  7. ^ Reiners, A.; Zechmeister, M.; Caballero, J. A.; Ribas, I.; Morales, J. C.; Jeffers, S. V.; Schöfer, P.; Tal-Or, L.; Quirrenbach, A.; Amado, P. J.; Kaminski, A.; Seifert, W.; Abril, M.; Aceituno, J.; Alonso-Floriano, F. J.; Ammler-von Eiff, M.; Antona, R.; Anglada-Escudé, G.; Anwand-Heerwart, H.; Arroyo-Torres, B.; Azzaro, M.; Baroch, D.; Barrado, D.; Bauer, F. F.; Becerril, S.; Béjar, V. J. S.; Benítez, D.; Berdinas̃, Z. M.; Bergond, G.; et al. (2018). "The CARMENES search for exoplanets around M dwarfs. High-resolution optical and near-infrared spectroscopy of 324 survey stars". Astronomy and Astrophysics. 612: A49. arXiv:1711.06576. Bibcode:2018A&A...612A..49R. doi:10.1051/0004-6361/201732054.
  8. ^ Choi, Charles Q. "Surprise! Giant Planet Found Circling Tiny Red Dwarf Star". Space.com. Retrieved 26 September 2019.
  9. ^ Morales, J. C.; Mustill, A. J.; Ribas, I.; Davies, M. B.; Reiners, A.; Bauer, F. F.; Kossakowski, D.; Herrero, E.; Rodríguez, E.; López-González, M. J.; Rodríguez-López, C.; Béjar, V. J. S.; González-Cuesta, L.; Luque, R.; Pallé, E.; Perger, M.; Baroch, D.; Johansen, A.; Klahr, H.; Mordasini, C.; Anglada-Escudé, G.; Caballero, J. A.; Cortés-Contreras, M.; Dreizler, S.; Lafarga, M.; Nagel, E.; Passegger, V. M.; Reffert, S.; Rosich, A.; et al. (2019). "A giant exoplanet orbiting a very-low-mass star challenges planet formation models". Science. 365 (6460): 1441–1445. arXiv:1909.12174. doi:10.1126/science.aax3198.