Alpha Librae (α Lib / α Librae) is the second brightest star in the constellation Libra (despite its Bayer designation as "alpha"). It also has the traditional name Zubenelgenubi. The Pleiades star cluster A star is a massive body of plasma in outer space which is currently or has in the past produced energy through nuclear fusion. ... -1... Libra (, and Latin for balance) is a constellation of the zodiac. ... Many of the brighter stars are given names which are known as Bayer designations. ...

Alpha Librae is located approximately 77 light years from the Sun. It is actually a visual binary consisting of two stars separated in the sky by an angular distance of 231" (3'51"). The brighter of the two is a white star of spectral type A3, with an apparent brightness of 2.8 and an absolute brightness of 1.1, designated alpha-2 Librae (α² Lib). Its companion is a type F4 star of apparent brightness 5.2 and absolute brightness 3.5, designated alpha-1 Librae (α¹ Lib). A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The Sun is the star at the centre of our Solar system. ... A visual binary star is a binary star for which the angular separation between the two components is great enough to permit them to be observed as a double star in a telescope. ... Angular size is a measurement of how large or small something is using rotational measurement (degrees of arc, arc_minutes, and arc-seconds). ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standardized distance away. ... Many of the brighter stars are given names which are known as Bayer designations. ...

Alpha Librae is close to the ecliptic so it can be easily occulted by the Moon and (very rarely) by planets. The next occultation by a planet will take place on 10 November 2052 with Mercury^[1]. The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... In this July, 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... A planet in common parlance is a large object in orbit around a star that is not a star itself. ... November 10 is the 314th day of the year (315th in leap years) in the Gregorian Calendar, with 51 days remaining. ... (Redirected from 2052) (20th century - 21st century - 22nd century - other centuries) Definition In calendars based on the Christian Era or Common Era, such as the Gregorian calendar, the 21st century is the current century, as of this writing, lasting from 2000-2099. ... For additional meanings, see Mercury (disambiguation). ...

The name, from Arabic الزبن الجنوبي (az-zuban al-janūbiyy), means "southern claw" and was coined before Libra was recognized as distinct from Scorpius. The alternate names Kiffa Australis and Elkhiffa Australis, partial Latin translations of Arabic al-kiffah al-janūbiyy, mean "southern pan (of the scales)". Arabic (العربية al-arabiyyah, or less formally arabi) is the largest member of the Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew and Aramaic. ... Scorpius ( , and Latin for scorpion) is one of the constellations of the zodiac. ... Latin is the language originally spoken in the region around Rome called Latium. ... Translations is a play by the Irish playwright Brian Friel. ...

Coordinates of the main star (equinox 2000.0)

• Right Ascension 14h50m52s
• Declination −15°50'0"

Coordinates of the companion (equinox 2000.0) Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ...

• Right Ascension 14h50m41s
• Declination −15°59'49"

The position angle of the companion is 314 degrees. Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... This article is about angles in geometry. ...

References

• Kaler, Jim (2004). "STARS: Zubenelgenubi". Retrieved July 10, 2005.
• ^ Peuschel, Marco (2003). "Astronomische Ereignisse der besonderen Art". Retrieved July 10, 2005.