Delta Lyrae (δ Lyr) is a 4th magnitude star in the constellation Lyra, approximately 900 light years away from Earth. It is a class M4II star, meaning it is a bright giant star with a surface temperature under 3,500 kelvins. It shines with the light of 6,500 Suns, and has a radius of 200 solar radii, or 0.95 times the radius of Earth's orbit, though other measurements give an even larger radius of 1.3 astronomical units.

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dbpprop:abstract
  • Delta Lyrae (δ Lyr) is a 4th magnitude star in the constellation Lyra, approximately 900 light years away from Earth. It is a class M4II star, meaning it is a bright giant star with a surface temperature under 3,500 kelvins. It shines with the light of 6,500 Suns, and has a radius of 200 solar radii, or 0.95 times the radius of Earth's orbit, though other measurements give an even larger radius of 1.3 astronomical units. It began life 75 million years ago as a bluish white B3 spectral type star of six solar masses, with a surface temperature between 11,000 and 25,000 kelvins. It now possesses a dead helium core, and is becoming an even larger giant. It is a semi-regular variable star that has its brightness change by 0.2 magnitudes over an ill-defined period. Delta Lyrae was once thought to form an optical double with the star Delta Lyrae, but it does not, only appearing to do so to the naked eye. The spectral type of the nearby star system CCDM J18545+3654BC suggests that they are at the same distance as Delta Lyrae, which could mean that the three stars form a trinary star system. In this case, CCDM J18545+3654BC would be 24,000 AU away from Delta Lyrae, and it would take 24,000 years for it to make an orbit. The two stars in the CCDM J18545+3654BC system take at least 10,500 years to make an orbit and are separated by 600AU.
dbpprop:appmagV
  • 4.3 (xsd:double)
dbpprop:bV
  • +1.67
dbpprop:class
  • M4II
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dbpprop:dec
  • +36° 53' 55.007"
dbpprop:epoch
  • J2000.0
dbpprop:pError
  • 0.56 (xsd:double)
dbpprop:parallax
  • 3.63 (xsd:double)
dbpprop:propMoDec
  • 3.26 (xsd:double)
dbpprop:propMoRa
  • -6.73 (xsd:double)
dbpprop:ra
  • 18h 54m 30.2838s
dbpprop:radialV
  • -26.4 (xsd:double)
dbpprop:uB
  • +1.65
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rdfs:comment
  • Delta Lyrae (δ Lyr) is a 4th magnitude star in the constellation Lyra, approximately 900 light years away from Earth. It is a class M4II star, meaning it is a bright giant star with a surface temperature under 3,500 kelvins. It shines with the light of 6,500 Suns, and has a radius of 200 solar radii, or 0.95 times the radius of Earth's orbit, though other measurements give an even larger radius of 1.3 astronomical units.
rdfs:label
  • Delta² Lyrae
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