Earthworm constellation

γ(γ Crv, γ Corvi or Pleiades I) is the brightest star among birds.

The English traditional name of crow's nest γ comes from Arabic "gienah" (al-Jan ā? Al-ghirāb al-yaman), which means "the right wing of the crow", is regarded as the left wing of the crow in modern star maps. Its English name Gienah is exactly the same as cygnus ε. Gienah Corvi (or Gienah Ghurab) can be used to distinguish Gienah (Tianjin Nine) in Cygnus.

In astrology, the role of γ is similar to that of Mars and Saturn, promoting greed and conspiracy. It is one of the Behnian stars in the Middle Ages, and the crow-shaped Kabbalah symbol file: Agrippa1531alaCorui.png.

Kakuji

ε(ε Crv, ε Corvi or Pleiades II) is a star in the constellation Ursa major. Its traditional English name is Minkar and Chinese name is Pleiades II.

The apparent magnitude of crow ε is +3.02, and its spectral type is K2Ⅲ, which is about 303 light years away from the Earth.

Kakuzo

δ(δCRV, CORVI or Pleiades III) is a star in the constellation Ursa. Its traditional English name is Algorab, and its Chinese name is yususan.

The apparent magnitude of Crow Delta is +3. 1, and the spectral type is A0, which is about 87 light years away from the Earth. Yasuji

Beta (Beta CRV, Beta Colvis, Beta CRV, Pleiades IV) is the second brightest star in the constellation Ursa, about 140 light-years away from the Earth, and it is a G-shaped bright giant. Its apparent magnitude is between 2.60 and 2.66.

Jurisdiction of rights

α(α Crv, α Corvi or right governance) is a star in the constellation Ursa. Its traditional name in China is "correct governance".

The spectral type of crow α is F0, the apparent magnitude is +4.00, and it is about 48 light years away from the Earth. Alpha crow is suspected to be a binary star system, but this has not been confirmed.

Zuohai

η η(η Crv, η Corvi or Zuo Hu) is a yellow-white main sequence star located in corvus corax. Around it, there is a dust disk.

Crow η is about 40% heavier than the sun, but its age is only 30% of the sun. Compared with the sun, only 90% of its isotopes are heavier than helium. Its rotation speed (vsini) at the equator is 68km/s.

According to the infrared astronomical satellite, crow η emits a lot of infrared rays, which is more than that of stars of the same type. Submillimeter-wave astronomical data confirmed that the stardust around crow η was about 60% of the mass of the moon, and the temperature was about 80 K. The data also showed that there was an arched astrolabe around crow η, and the radius was at most 180 AU( 180 times the distance between the earth and the sun).

The current observation technology is enough to distinguish some substances that make up the dust disk. The dust disk is flat, and the radius of the outer ring is 150 AU. Its orbital inclination is just the same as that of the earth. There is almost no matter in the disk at 100 AU, so people think that all the matter has been removed by a planetary system. Although there is some evidence that there are some discontinuous (separated) areas in the temperature of 1-2AU, these have yet to be confirmed.

According to the estimation of crow η age, it can be inferred that the astrolabe around the arch evolved after crow η. According to Poynting-Robertson effect, dust will eventually fall into the stars after about 20 million years, and it is inferred that these dust are formed by the collision of larger celestial bodies with a distance of about 150 AU.