Image source [1]: The Double Cluster (NGC 869 and NGC 884).
Hello friends continuing our journey through the constellations, today we will know the constellation of Perseus, Pisces, Piscis Austrinus and Sagitta.
Perseus is a constellation in the northern sky, being named after the Greek mythological hero Perseus. It is one of the 48 listed by the 2nd-century astronomer Ptolemy, and among the 88 modern constellations defined by the International Astronomical Union (IAU). Algol also known by its Bayer designation Beta Persei, is the best-known star in Perseus. Representing the head of the Gorgon Medusa in Greek mythology, it was called Horus in Egyptian mythology and Rosh has Satan ("Satan's Head") in Hebrew. Located 92.8 light-years from Earth, it varies in apparent magnitude from a minimum of 3.5 to a maximum of 2.3 over a period of 2,867 days.
Image source [2]: The constellation Perseus as it can be seen by the naked eye.
Pisces is a constellation of the zodiac. Its name is the Latin plural for fish. It lies between Aquarius to the west and Aries to the east. The ecliptic and the celestial equator intersect within this constellation and in Virgo.
Image source [3]: The constellation Pisces as it can be seen by naked eye.
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Pisces Austrinus was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. The stars of the modern constellation Grus once formed the "tail" of Pisces Austrinus. Fomalhaut traditionally represents the mouth of the fish. Its companion Fomalhaut was thought to be the first extrasolar planet ever detected by a visible light image, thanks to the Hubble Space Telescope, but infrared observations have since retracted this claim: it is instead a spherical cloud of dust.
Image source [4]: The constellation Piscis Austrinus as it can be seen by the naked eye.
Sagitta is a dim but distinctive constellation in the northern sky. Its name is Latin for "arrow", and it should not be confused with the larger larger constellation Sagittarius, the archer. Although Sagitta is an ancient constellation, it has not star brighter than 3rd magnitude and has the third-smallest area of
all constellations (only Equuleus and Crux are smaller). It was included among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union.
Image source [5]: The constellation Sagitta as it can be seen by the naked eye.
