HYDRA  , in See also:

• ASTRONOMY (from Gr. &arpov, a star, and v ,usiv, to classify or arrange)

astronomy, a See also:

• CONSTELLATION (from the Lat. constellatus, studded with stars; co'n, with, and Stella, a star)

constellation of the See also:

• SOUTHERN

southern hemisphere, mentioned by See also:

• EUDOXUS

Eudoxus (4th See also:

• CENTURY (from Lat. centuria, a division of a hundred men)

century B.C.) and See also:

• ARATUS

Aratus (3rd century B.c.), and catalogued by See also:

• PTOLEMY (CLAUDIUS PTOLEMAEUS)

Ptolemy (27 stars), Tycho See also:

• BRAHE, PER, COUNT (1602-1680)
• BRAHE, TYCHO (1546-1601)

Brahe (19) and See also:

• HEVELIUS [HEVEL or H6WELCKE], JOHANN (1611—1687)

Hevelius (31) . Interesting See also:

• OBJECTS

objects are: the nebula H . I V . 27 Hydrae, a planetary nebula, gaseous and whose See also:

• LIGHT

light is about equal to an 8th magnitude See also:

• STAR

star; Hydrae, a beautiful triple star, composed of two yellow stars of the 4th and 6th magnitudes, and a See also:

• BLUE (common in different forms to most European languages)

blue star of the 7th magnitude; R . Hydrae, a See also:

• LONG, GEORGE (1800-1879)
• LONG, JOHN DAVIS (1838– )

long See also:

• PERIOD
• PERIOD (Gr. irepioSos, a going or way round, circuit, aepi, round, and &Sis, way, road)

period (425 days) variable, the range in magnitude being from 4 to 9.7; and U . Hydrae, an irregularly variable, the range in magnitude being 4.5 to 6 .