mardi 23 septembre 2008

Perseus 7

Rho Persei (ρ Per / ρ Persei) is a star in the constellation Perseus. It also has the traditional name Gorgonea Tertia.
Rho Persei is a semiregular variable star of the μ Cephei type, whose apparent magnitude varies between 3.3 and 4.0 with periods of 50 days and 1100 days. It is of spectral class M4 and is approximately 317 light years from Earth. ρ Persei has a total luminosity of some 3470 times that of the Sun while its radius is 164 times solar. The star has a mass of 3 solar masses while its surface temperature is some 3460 kelvins. Gorgonea Tertia
Eta Persei (η Per) is a star in the constellation Perseus. It also has the traditional Arabic name Miram.
Miram belongs to spectral class K3 and has an apparent magnitude of +3.76. It is approximately 1331 light years away from Earth. Miram, Al Sa'id
Nu Persei (ν Per / ν Persei) is a Class F5, fourth-magnitude star in the constellation Perseus. It has the seldom used proper name Adad, meaning "the Upper Arm". It is also called Adid Media, meaning "Middle One of the Upper Arm" [of the Pleiades], in Arabic.
Nu Persei is a highly luminous yellow-white giant located about 555 light-years from Earth. Adad, Adid Media
Kappa Persei (κ Per) is a star in the constellation Perseus. It also has the traditional name Misam.
Misam belongs to the spectral class K0 and has apparent magnitude +3.8. It is 112 light years from Earth. Kappa Persei is a triple star system consisting of a spectroscopic double star with a wider companion.
Omicron Persei (ο Per) is a star in the constellation Perseus. It also has the traditional name Atik (also Ati, Al Atik, Arabic for "the shoulder").
Atik is a spectroscopic binary star consisting of a spectral type B1 giant and a type B3 dwarf orbiting each other every 4.5 days.
Atik
Al-'Atiq
"The shoulder" of the Pleiades
عاتق الثّريّا
Xi Persei (ξ Per) is a star in the constellation Perseus. It also has the traditional name Menkib (Menchib, Menkhib, Arabic for "shoulder" [of the Pleiades]).
Menkib has apparent magnitude +4.04 and is classified as a blue giant (spectral class O7.5III). It is approximately 1600 light years from Earth.
Xi Persei has a visual luminosity 13,500 times that of the Sun while the total luminosity is 330,000 times that of the Sun. The star has a mass of some 40 solar masses and a surface temperature of 37,000 kelvins, making it one of the hottest stars that can be seen with the naked eye.
Menkib
Al-Mankib
"The shoulder" of the Pleiades
منكب الثّريّا
Phi Persei (φ Persei / φ Per) is a Class G8III, fourth-magnitude star in the constellation Perseus. It is, on rare occasions, called by the proper name Seif or Alseiph (Arabic السيف al-sa'if meaning "the sword"), derived from السيف و الأنفال al-sa'if wa al-anfal, meaning "The Sword and the Spoils", which was the title of an ancient Arab asterism between Andromeda and Perseus. Due to its isolation and distance from Cassiopeia, Andromeda and Perseus, John Flamsteed never took thought to assign a number and constellation to Phi Persei.
Phi Persei is a blue giant star of class B2 and an apparent magnitude of 4.01. Phi Persei is a variable Star with rapid variations in its brightness and spectrum. The Phi Persei stellar system is located about 716 light-years from Earth.
Iota Persei (ι Per / ι Persei) is a main sequence dwarf star in the constellation Perseus. It is somewhat larger and greater in mass than the Sun, and is located about 34 light years distant. Iota Persei has a relatively high proper motion across the sky, and moves at a net velocity of 92 km/s, relative to the Sun.
No sub-stellar companions to this star have yet been found. There is a 12th-magnitude line of sight companion star that is not believed to be gravitationally associated with Iota Persei.
Theta Persei (θ Per) is a star system 37 light years away from Earth, in the constellation Perseus. The primary star is a yellowish dwarf (main sequence) star of spectral type F7V, which is somewhat larger and brighter than our sun, but still within the range considered to have the potential for Earth-like planets. There is also a red dwarf companion of spectral type M1V, orbiting about 250 AU from the primary.
Omega Persei (ω Per) is a star in the constellation Perseus. It also has the traditional name Gorgonea Quarta.
Omega Persei has an apparent magnitude of +4.63 and spectral class K1 III lying about 305 light years from Earth.
Pi Persei (π Per) is a star in the constellation Perseus. It also has the traditional name Gorgonea Secunda.
Pi Persei has an apparent magnitude of +4.7 and spectral class A2V. The star is about 362 light years from Earth.

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