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Delta Capricorni
Delta Capricorni is the brightest star in the constellation of Capricornus, the Sea Goat. It is a binary star system whose components are seen to eclipse each other, known as an eclipsing binary. The baseline apparent magnitude is 2.81, and during the primary and secondary eclipse it dims to 3.05 and 2.90, respectively. The system lies at a distance of 38.7 light-years (11.9 pc), based on parallax measurements.
The two components of this system are designated Delta Capricorni Aa and Delta Capricorni Ab. The former is the primary and has the proper name Deneb Algedi, pronounced /ˌdɛnɛb ælˈdʒiːdiː/; the traditional name of the system.
Delta Capricorni is positioned 2.6 degrees south of the ecliptic and can be occulted by the Moon, and (rarely) by planets.
δ Capricorni (Latinised to Delta Capricorni, abbreviated Delta Cap or δ Cap) is the system's Bayer designation. The designations of the three constituents as Delta Capricorni A, B and C, and those of A's components – Delta Capricorni Aa and Ab – derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
The system bore the traditional names Deneb Algedi, derived from the Arabic ذنب الجدي (ðanab al-jady), meaning "the tail of the goat", referring to the fishlike tail of the celestial sea-goat Capricorn, and Scheddi. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name Deneb Algedi for the component Delta Capricornii Aa on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.
In Chinese astronomy, Delta Capricorni is known as 壘壁陣四 (Lěi Bì Zhèn sì), meaning 'The Fourth Star of the Line of Ramparts'. This refers to its presence among an asterism known as 'The Line of Ramparts', which also includes Kappa Capricorni, Epsilon Capricorni, Gamma Capricorni, Iota Aquarii, Lambda Aquarii, Sigma Aquarii, Phi Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.
In 1906 astronomer Vesto Slipher of Lowell Observatory discovered that Delta Capricorni A was a spectroscopic binary. The orbit was determined in 1921 by Clifford Crump using 69 radial velocity measurements obtained at Yerkes Observatory. However the eclipsing binary nature of the system was not discovered until 1956 by Olin J. Eggen at Lick Observatory.
Lunar occultations have been observed in 1951, 1962, and 1988.
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Delta Capricorni
Delta Capricorni is the brightest star in the constellation of Capricornus, the Sea Goat. It is a binary star system whose components are seen to eclipse each other, known as an eclipsing binary. The baseline apparent magnitude is 2.81, and during the primary and secondary eclipse it dims to 3.05 and 2.90, respectively. The system lies at a distance of 38.7 light-years (11.9 pc), based on parallax measurements.
The two components of this system are designated Delta Capricorni Aa and Delta Capricorni Ab. The former is the primary and has the proper name Deneb Algedi, pronounced /ˌdɛnɛb ælˈdʒiːdiː/; the traditional name of the system.
Delta Capricorni is positioned 2.6 degrees south of the ecliptic and can be occulted by the Moon, and (rarely) by planets.
δ Capricorni (Latinised to Delta Capricorni, abbreviated Delta Cap or δ Cap) is the system's Bayer designation. The designations of the three constituents as Delta Capricorni A, B and C, and those of A's components – Delta Capricorni Aa and Ab – derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
The system bore the traditional names Deneb Algedi, derived from the Arabic ذنب الجدي (ðanab al-jady), meaning "the tail of the goat", referring to the fishlike tail of the celestial sea-goat Capricorn, and Scheddi. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name Deneb Algedi for the component Delta Capricornii Aa on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.
In Chinese astronomy, Delta Capricorni is known as 壘壁陣四 (Lěi Bì Zhèn sì), meaning 'The Fourth Star of the Line of Ramparts'. This refers to its presence among an asterism known as 'The Line of Ramparts', which also includes Kappa Capricorni, Epsilon Capricorni, Gamma Capricorni, Iota Aquarii, Lambda Aquarii, Sigma Aquarii, Phi Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.
In 1906 astronomer Vesto Slipher of Lowell Observatory discovered that Delta Capricorni A was a spectroscopic binary. The orbit was determined in 1921 by Clifford Crump using 69 radial velocity measurements obtained at Yerkes Observatory. However the eclipsing binary nature of the system was not discovered until 1956 by Olin J. Eggen at Lick Observatory.
Lunar occultations have been observed in 1951, 1962, and 1988.