GJ 3512

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GJ 3512
Sterrebeeld Groot Beer
Spektraaltipe M5,7[1]
Soort Rooidwerg
Waarnemingsdata (Epog J2000)
Regte klimming 08h 412m 201289s[2]
Deklinasie +59° 29′ 50.445″[2]
Skynmagnitude (m) 15,05[3]
Besonderhede
Massa (M) 0,117[4]
Radius (R) 0,166[4]
Ligsterkte (L) 0,00083[5]
Temperatuur (K) 2 844[5]
Afstand (ligjaar) 31
Rotasiespoed (km/s) 2[6]
Metaalinhoud [Fe/H] +0,02[1]
Ander name
2MASS J08412013+5929505, G 234-45
Portaal  Portaalicoon   Sterrekunde

GJ 3512 is ’n rooidwergster 31 ligjare van die Son af. Dit het ’n gasreus wat om hom wentel.

GJ 3512 het ’n massa van rofweg 0,12 keer dié van die Son en sy planeet, GJ 3512b, het ’n minimum massa van 0,46 dié van Jupiter. Die ster se massa is net 250 keer dié van die gasreus, en dit werp twyfel oor tradisionele modelle van planeetvorming.[7][8]

Verwysings[wysig | wysig bron]

  1. 1,0 1,1 (2015) “M Dwarf Luminosity, Radius, and α-enrichment from I-band Spectral Features”. The Astrophysical Journal 802 (1): L10. doi:10.1088/2041-8205/802/1/L10.
  2. 2,0 2,1 (Augustus 2018) “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics 616. doi:10.1051/0004-6361/201833051.
  3. (1996) “Photometry of Stars with Large Proper Motion”. The Astronomical Journal 112: 2300. doi:10.1086/118183.
  4. 4,0 4,1 (2016) “The Rotation and Galactic Kinematics of Mid M Dwarfs in the Solar Neighborhood”. The Astrophysical Journal 821 (2): 93. doi:10.3847/0004-637X/821/2/93.
  5. 5,0 5,1 (2015) “An Empirical Calibration to Estimate Cool Dwarf Fundamental Parameters from H-band Spectra”. The Astrophysical Journal 800 (2): 85. doi:10.1088/0004-637X/800/2/85.
  6. (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. doi:10.1051/0004-6361/201732054.
  7. Choi, Charles Q. "Surprise! Giant Planet Found Circling Tiny Red Dwarf Star". Space.com. Besoek op 26 September 2019.
  8. (2019) “A giant exoplanet orbiting a very-low-mass star challenges planet formation models”. Science 365 (6460): 1441–1445. doi:10.1126/science.aax3198.