What is the constellation on September 28th?

September 28th of Gregorian calendar is Libra. The date of the lunar calendar is not used as a constellation standard.

Libra, September 23rd-65438+1October 23rd, is the seventh house of the zodiac, located in the southeast of Virgo, and also 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.

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.

Extended data

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.