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- Q10371417 subject Q7009396.
- Q10371417 subject Q7217188.
- Q10371417 subject Q7465903.
- Q10371417 subject Q7724320.
- Q10371417 subject Q8293947.
- Q10371417 subject Q8461104.
- Q10371417 subject Q8503558.
- Q10371417 subject Q8691170.
- Q10371417 abstract "Sigma Coronae Borealis is a quintuple star system in the constellation Corona Borealis, the main components of which are three sunlike stars. Appearing as a single star of apparent magnitude 5.3 to the unaided eye, Sigma can be separated into 6.6-magnitude Sigma1 and 5.64-magnitude Sigma2 when observed with a telescope. The two take 726 years to orbit each other. The orbit of Sigma1 is eccentric, with an average distance of 128 AU, and a minimum of 31 AU and maximum of 225 AU. Sigma1 is a yellow main sequence star of spectral type G1V and weighing around 1 solar mass. Sigma2 is a spectroscopic binary system composed of two stars very close (6 solar radii) together that orbit each other every 1.14 days. These stars are 1.14 and 1.09 times as massive as the Sun, with spectral types F9V and G0V respectively. Each has a diameter around 1.2 times that of the Sun. They rotate each other very rapidly, and are very active as a result, with prominent star spots and are classed as RS Canum Venaticorum variables. The system emits radio waves. Much further away, at a distance of 14,000 astronomical units (AU), are a pair of red dwarf stars that take 52 years to rotate each other. This pair has a combined apparent magnitude of 12.24. Another pair of faint stars that appear nearby were found to be unrelated.The system is thought to be anywhere from 100 million to 3 billion years old, from measurement of lithium in its spectrum. Its parallax was measured in 1999, yielding a distance of 74.2 light-years.".
- Q10371417 wikiPageWikiLink Q10406.
- Q10371417 wikiPageWikiLink Q111130.
- Q10371417 wikiPageWikiLink Q1392913.
- Q10371417 wikiPageWikiLink Q180892.
- Q10371417 wikiPageWikiLink Q2911554.
- Q10371417 wikiPageWikiLink Q555846.
- Q10371417 wikiPageWikiLink Q7009396.
- Q10371417 wikiPageWikiLink Q7217188.
- Q10371417 wikiPageWikiLink Q7465903.
- Q10371417 wikiPageWikiLink Q7724320.
- Q10371417 wikiPageWikiLink Q8293947.
- Q10371417 wikiPageWikiLink Q845735.
- Q10371417 wikiPageWikiLink Q8461104.
- Q10371417 wikiPageWikiLink Q8503558.
- Q10371417 wikiPageWikiLink Q8691170.
- Q10371417 wikiPageWikiLink Q984158.
- Q10371417 type Place.
- Q10371417 type CelestialBody.
- Q10371417 type Location.
- Q10371417 type Place.
- Q10371417 type Star.
- Q10371417 type Thing.
- Q10371417 comment "Sigma Coronae Borealis is a quintuple star system in the constellation Corona Borealis, the main components of which are three sunlike stars. Appearing as a single star of apparent magnitude 5.3 to the unaided eye, Sigma can be separated into 6.6-magnitude Sigma1 and 5.64-magnitude Sigma2 when observed with a telescope. The two take 726 years to orbit each other. The orbit of Sigma1 is eccentric, with an average distance of 128 AU, and a minimum of 31 AU and maximum of 225 AU.".
- Q10371417 label "Sigma Coronae Borealis".
- Q10371417 name "Sigma Coronae Borealis".