![]() ![]() "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". ↑ 3.0 3.1 3.2 3.3 3.4 Rho Cassiopeiae (7 Cassiopeiae) Star Facts.Curiously the spectral class also changed to M, though a year later it had returned to its usual G. Its surface also reduced its temperature from around 7,000 kelvin to only 3,000 kelvin. In 1946, the stars brightness decreased by two magnitudes to the sixth magnitude. Such outbursts occurred in the summer of 1946 and more recently in June-September 2000. However every 50 years, the star undergoes an "outburst" event in which up to 10,000 earth masses of material may be lost. This is lost in a solar wind being projected from the star at a speed of 10 km/s. The star is thought to be loosing mass at a rate of 10 -4 solar masses per year or equivalently, 33 earth masses. These periods appear to themselves vary, meaning the star is quite unpredictable. Several periods have been observed including multiple periods of 820, 350, 510, and 645 days. The star is a semi-regular variable star, meaning its intrinsic brightness varies slowly over time. Due to a large cloud of dust in between earth and the star, the star appears fainter by two orders of magnitude, but is still sufficiently bright to be seen with the unaided eye. The star belongs to the spectral class G2Ia0e and the sun, most of the radiation it emits is in the visible region of the electromagnetic spectrum. ![]() Its surface has a temperature of 7,300 kelvin, a little hotter than sol. It is thought the star's mass is roughly 40 solar masses and a radius of 4.3 AU, making it 450 times larger than the sun. It is an enormous star, emitting roughly 550,000 times more energy than the Sun and an absolute magnitude of -7.5. Rho Cassiopeia lies 11,648.69 light years from Earth. Though one of the dimmer stars in Cassiopia, it can still be observed with the unaided eye relatively easily. Higher letters indicate dimmer stars, so Rho Cassiopeiae's designation as rho indicates it is a dim star in Cassiopeiae. Its name "Rho Cassiopiae" is the Bayer designation for the star, where the Greek letter Rho indicates the star's relative brightness to the other stars in the constellation it is in. It is also a particularly rare type of star as it is a yellow hypergiant, and only six other such stars have been observed in our galaxy. The star is one of the brightest stars in the Milky Way and is thought to be a type of variable star. Rho Cassiopeiae (Rho Cas, 7 Cassiopeiae) is a hypergiant star in the constellation of Cassiopeia. ![]()
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