From the Science Archives, the open-project database of science information
Jump to navigation Jump to search
Observation data
Epoch {{{epoch}}}      Equinox
Constellation Boötes
Right ascension {{{ra1}}}
Declination {{{dec1}}}
Apparent magnitude (V) {{{appmag_v1}}}
Right ascension {{{ra2}}}
Declination {{{dec2}}}
Apparent magnitude (V) {{{appmag_v2}}}
Evolutionary stage red giant
Spectral type K0
Distance203 light years ly
Radius33[1] R
Diameter33[1] D
Luminosity (bolometric)501 L
Temperature4,550 K
Other designations
Izar, Epsilon Boötis

Izar, also known as Epsilon Boötis, is a star located in the constellation Boötes. It is located 203 light years light years away from the Earth. Izar has a diameter of 33[1] D, making it around the size of the orbit of Mercury. Izar has a stellar class of K0 and a temperature of 4,550 degrees Kelvin; it is a red giant that is currently burning elements heavier than hydrogen within its core. Izar is around 501 times brighter than the Sun. Izar has a companion, a main sequence A2 V[2] star that fuses hydrogen and can be seen with the naked eye. The believed Black Night Satellite, proposed by Icons-flag-gb-sct.png Scottish writer Duncan Lunan, is believed to have originated from this star system.

Illustration of the two components of the Izar system. North is to the top.


Add your comment
The Science Archives welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

As a reminder, article comments are only for discussions on how to improve the article. Please direct other comments to a user's talk page. Please be formal and do not use excessive uppercase. Please be advised you may receive an automatic block if you break the article comments policy. For information regarding what is acceptable/not acceptable in article comments, please message Icons-flag-ru.png Joey (talk), Natalia (talk), Icons-flag-fr.png ynoss (talk), or Icons-flag-ca.png Daniel (older account/talk).