Fortune Telling Collection - Zodiac Guide - The constellation of Libra-the constellation of Libra
The constellation of Libra-the constellation of Libra
Libra (September 23rd-65438+1October 23rd) is the seventh house of the zodiac, which is located in the southeast of Virgo and belongs to the zodiac. The four brightest 3m stars α, β, γ and σ in the constellation form a quadrilateral, and the β star and the spring triangle form a big diamond, so you can find this constellation. Latitude varies between +65 and? It is completely visible between 90 degrees.
Tianming
libra
Latin name
pound
Latin abbreviation
liberation movement
indicate
balance
right ascension
15 hours
slanting
- 15
zone
538
Regional ranking
No.29
The number of bright stars
2
Brightest star
Libra β
meteor shower
Libra may meteor shower
Adjacent constellation
Ophiuchus, Virgo, Ophiuchus, Wolf, Scorpio, Ophiuchus.
Optimal observation time
June
Optimum observation latitude
+65 and? Between 90 degrees
Apparent magnitude of the brightest star
2.6
Fully visible area
60 Newton -90 Newton
Zuo Beijing
Libra (Latin: Libra, astronomical symbol:) is one of the zodiac signs and one of the Ptolemaic constellations. Between Virgo and Scorpio, there are more than a dozen galaxies in this constellation that can be seen with 8-inch (20 cm) or larger telescopes. The four brightest stars in the constellation, α, β, γ and σ form a quadrilateral, and β and the spring triangle form a big diamond. Libra beta, whose middle name is "zubeneschamali", is the only star with green visible to the naked eye all day. Libra alpha star "zubenelgenubi" is a binary star, which is composed of α 1 with brightness of 5.2 and α2 with brightness of 2.8, and appears blue and white.
Libra (chèng), the word "scale" has only one pronunciation, and that is: chèng.
Study history
The stars in Libra have been recognized since ancient times, but Ptolemy did not regard them as independent constellations. In Ptolemy constellation, the star of Libra belongs to Scorpio's claw, Libra α is Scorpio's north claw, Libra β is Scorpio's south claw.
People regard the stars as a steelyard, symbolizing fairness. But it wasn't until Caesar's time in 1 century that the Romans discovered that when the sun moved to this constellation, it was around the autumnal equinox, so it was drawn independently.
Due to the precession of the earth, the autumnal equinox has moved to Virgo in the west. In the epoch, the sun runs in Libra from 165438+ 10/to 1 65438+123 October every year.
Deep sky object
NGC 5897: This is a loose globular cluster that can only be seen slightly with an 8-inch (20 cm) telescope.
Important main star
Libra α (Zubenelgenubi) and Zubenelgenubi (South Claw) are two visual binaries, which are composed of α 1 with brightness of 5.2 and α2 with brightness of 2.8, showing blue and white.
Libra Zubeneschemali and Zubeneschemali (North Claw), a blue dwarf with a spectral classification of B8 and an apparent magnitude of 2.6, are the only green stars visible to the naked eye.
Libra σ (70%), Zubenelakrab (scorpion's claw), eclipse star. Although Libra σ is in Libra, not on the boundary of Libra, it was previously called Scorpio γ, and it didn't become Libra σ until AD 185 1 year (Benjamin Gould answered).
Libra δ (Pleiades Zeng Yi), also known as South Australia, is an eclipsing binary star like Perseus β. Eclipsing binary stars are two stars that periodically eat each other. From the perspective of the earth, their brightness will change. The magnitude variation of Libra δ is +4.8 to +5.9, and the light variation period is 2.3 days.
Libra μ (Pleiades Plus Five) consists of two stars with brightness of 5.7 and 6.7 respectively.
Libra (Pleiades II), a complex multi-star, is 4.5 stars to the naked eye.
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