P Cygni [SEP] constellation
P Cygni
P Cygni (34 Cyg) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in "Uranometria" as a nova. Located about 5,000 to 6,000 light-years (1,500–1,800 parsecs) from Earth, it is a hypergiant luminous blue variable (LBV) star of spectral type B1Ia that is one of the most luminous stars in the Milky Way.
Visibility.
The star is located about 5,000 to 6,000 light-years (1,500–1,800 parsecs) from
HD 316285
HDE 316285 is a blue supergiant star in the constellation Sagittarius. It is a candidate Luminous Blue Variable and lies about 6,000 light years away in the direction of the galactic centre.
Discovery.
HD 316285 was identified in 1925 as an unusual star having P Cygni lines in its spectrum, lines with both emission and absorption components offset by a doppler shift. It was classified as a Be star although it is now known to be a supergiant and the class of Be stars excludes supergiants, and was included