Delta Capricorni

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). ==Observational history==

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. Delta Capricorni was recognised as a metallic-line star in 1957 and included in a 1958 catalog of magnetic stars. It has also been associated with extreme ultraviolet and radio sources, believed to be from coronal activity in the secondary star. ==Stellar system==

light curve for Delta Capricorni, adapted from Lloyd and Wonnacott (1994) ==In culture==

According to astrology, Delta Capricorni's representation of a flexible tail is reflected in its association with both good and bad fortune alike. It was one of the fifteen Behenian stars of medieval astrology, associated with chalcedony, marjoram and the kabbalistic symbol . ==See also==