What constellation is 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.