Sigma Cancri
Encyclopedia
The Bayer designation
Sigma Cancri (σ Cnc / σ Cancri) is shared by three star system
s, in the constellation
Cancer
:
The above correspondence between Flamsteed and Bayer designations is the modern one, which is based on the Atlas Coelestis Novus published by Eduard Heis
in 1872. An alternate correspondence sometimes encountered, for instance in the 1835 astronomical catalogue of Thomas Brisbane
, is:
Johann Bayer
's Uranometria
places the sigma between these two groups of stars, making proper association uncertain.
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Sigma Cancri (σ Cnc / σ Cancri) is shared by three star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Cancer
Cancer (constellation)
Cancer is one of the twelve constellations of the zodiac. Its name is Latin for crab and it is commonly represented as such. Its symbol is . Cancer is small and its stars are faint...
:
- σ¹ CancriSigma1 CancriSigma1 Cancri is a star in the constellation Cancer.σ1 Cancri is a white A-type main sequence dwarf with an apparent magnitude of +5.67. It is approximately 204 light years from Earth....
, which has the Flamsteed designationFlamsteed designationFlamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. Each star is assigned a number and the Latin genitive of the constellation it lies in...
51 Cancri - σ² CancriSigma2 CancriSigma2 Cancri is a star in the constellation Cancer.σ2 Cancri is a white A-type subgiant with an apparent magnitude of +5.44. It is approximately 195 light years from Earth....
, which has the Flamsteed designation 59 Cancri - σ³ CancriSigma3 CancriSigma3 Cancri is a star in the constellation Cancer. It is approximately 320 light years from Earth.σ3 Cancri is a yellow G-type giant with an apparent magnitude of +5.23....
, which has the Flamsteed designation 64 Cancri
The above correspondence between Flamsteed and Bayer designations is the modern one, which is based on the Atlas Coelestis Novus published by Eduard Heis
Eduard Heis
Eduard Heis was a German mathematician and astronomer.He completed his education at the University of Bonn in 1827, then taught mathematics at a school in Cologne. In 1832 he taught at Aachen, and remained there until 1852. He was then appointed by King Frederick William IV to a chair position at...
in 1872. An alternate correspondence sometimes encountered, for instance in the 1835 astronomical catalogue of Thomas Brisbane
Thomas Brisbane
Major-General Sir Thomas Makdougall Brisbane, 1st Baronet GCH, GCB, FRS, FRSE was a British soldier, colonial Governor and astronomer.-Early life:...
, is:
- σ¹ Cancri = 46 Cancri46 Cancri46 Cancri is a star in the constellation Cancer. Its apparent magnitude is 6.12....
- σ² Cancri = 57 Cancri57 Cancri57 Cancri is a binary star in the constellation Cancer. It is approximately 365 light years from Earth.The primary component, 57 Cancri A, is a yellow G-type giant with an apparent magnitude of +6.1. Its companion, 57 Cancri B is an orange K-type star with an apparent magnitude of +6.6. The two...
- σ³ Cancri = 61 Cancri61 Cancri61 Cancri is a star in the constellation Cancer. Its apparent magnitude is 6.25. It is approximately 165.3 light years away from Earth....
Johann Bayer
Johann Bayer
Johann Bayer was a German lawyer and uranographer . He was born in Rain, Bavaria, in 1572. He began his study of philosophy in Ingolstadt in 1592, and moved later to Augsburg to begin work as a lawyer. He grew interested in astronomy during his time in Augsburg...
's Uranometria
Uranometria
Uranometria is the short title of a star atlas produced by Johann Bayer.It was published in Augsburg, Germany, in 1603 by Christophorus Mangus under the full title Uranometria : omnium asterismorum continens schemata, nova methodo delineata, aereis laminis expressa. This translates to...
places the sigma between these two groups of stars, making proper association uncertain.