BD+20°2457 b is a brown dwarf located between 320 to 980 light years away in the constellation of Leo, orbiting the 10th magnitude K-type bright giant star BD+20°2457. It has mass 21.42 times more massive than Jupiter and the orbit takes 4% longer than Earth’s to go around the star. The other companion in this system BD+20°2457 c, is a very massive planet (massing at least 12.47 times greater than Jupiter), meaning it is likely that other companion may also be a brown dwarf.

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dbpprop:abstract
  • BD+20°2457 b is a brown dwarf located between 320 to 980 light years away in the constellation of Leo, orbiting the 10th magnitude K-type bright giant star BD+20°2457. It has mass 21.42 times more massive than Jupiter and the orbit takes 4% longer than Earth’s to go around the star. The other companion in this system BD+20°2457 c, is a very massive planet (massing at least 12.47 times greater than Jupiter), meaning it is likely that other companion may also be a brown dwarf. This brown dwarf was discovered on June 10, 2009 using the Hobby-Eberly Telescope.
dbpprop:angDist
  • 4.83–14.5
dbpprop:apastron
  • 1.67 (xsd:double)
dbpprop:appmagV
  • 9.75 (xsd:double)
dbpprop:argPeri
  • 207.64 ± 21.99
dbpprop:class
  • K2II
dbpprop:constell
dbpprop:dec
dbpprop:discoverers
  • Niedzielski et al.
dbpprop:discoveryDate
  • June 10, 2009
dbpprop:discoveryMethod
dbpprop:discoverySite
dbpprop:discoveryStatus
  • Published
dbpprop:distLy
  • 650 ± 330
dbpprop:distPc
  • 200 ± 100
dbpprop:eccentricity
  • 0.15 ± 0.03
dbpprop:periastron
  • 1.23 (xsd:double)
dbpprop:period
  • 379.63 ± 2.01
dbpprop:periodYear
  • 1.0394 ± 0.0055
dbpprop:planet
  • b
dbpprop:ra
dbpprop:semiAmp
  • ?
dbpprop:semimajor
  • 1.45 (xsd:double)
dbpprop:simbad
  • BD%2B14+4559+b
dbpprop:star
dbpprop:tPeri
  • 54677.03 ± 28.19
dbpprop:wikiPageUsesTemplate
rdfs:comment
  • BD+20°2457 b is a brown dwarf located between 320 to 980 light years away in the constellation of Leo, orbiting the 10th magnitude K-type bright giant star BD+20°2457. It has mass 21.42 times more massive than Jupiter and the orbit takes 4% longer than Earth’s to go around the star. The other companion in this system BD+20°2457 c, is a very massive planet (massing at least 12.47 times greater than Jupiter), meaning it is likely that other companion may also be a brown dwarf.
rdfs:label
  • BD+20°2457 b
skos:subject
foaf:page
is dbpprop:exoplanet of