Lambda Aquarii [SEP] constellation
Lambda Aquarii
Lambda Aquarii (λ Aqr, λ Aquarii), informally known as Hydor , is the Bayer designation for a star in the equatorial constellation of Aquarius. The apparent visual magnitude of this star is 3.722, which is bright enough to be visible with the naked eye. It is roughly from Earth.
Properties.
Lambda Aquarii is a red giant star with a stellar classification of M2.5 III. It is classified as slow irregular variable and pulsation periods of 24.5, 32.0, and 49.5 days have been
now so included in the List of IAU-approved Star Names.
In Chinese, (), meaning "Palace Guard", refers to an asterism consisting of Delta Aquarii, 29 Aquarii, 35 Aquarii, 41 Aquarii, 47 Aquarii, 49 Aquarii, Lambda Piscis Austrini, HD 212448, Epsilon Piscis Austrini, 21 Piscis Austrini, 20 Piscis Austrini, Upsilon Aquarii, 68 Aquarii, 66 Aquarii, 61 Aquarii, 53 Aquarii, 50 Aquarii, 56 Aquarii, 45 Aquarii, 58 Aquarii, 64 Aquarii, 65