Sirius B radiates only 0.040 times the power radiated by the sun. …a faint object (now called Sirius B), about 10,000 times fainter than Sirius (now called Sirius A) or 500 times fainter than the Sun. Sirius B is the chief member of a trio of classic white dwarfs, the others Procyon B and 40 Eridani B. The EUVE spectrum … The two stars orbit each other every 50 years. Sirius A has a radius of 740,000 miles (1.2 million km), 71% larger than the radius of the sun, Sirius B has a radius of only 3,650 km (5,900 km), which makes it slightly smaller than the planet Earth! In 2005, astronomers used data from the Hubble Space Telescope to measure the diameter of Sirius B and found that the star was almost as large as Earth (12,000 km or 7,500 mi), with a mass 102% of the Sun’s. As for size, if Sirius C/Sirius B = Jupiter/Earth, then the ratio of radius size is about 11. Select the one among the following which is closest in size (radius) to a white dwarf. Assuming that Sirius B has the same emissivity as the sun, nd the radius of Sirius B. Radius. This companion star, Sirius B, is about as massive as the Sun, though much more condensed, and was the first white dwarf star to be discovered. So Sirius C is bigger than Sirius B. The first one was found in the triple star system 40 Eridani. Sirius A Radius has been calculated as being 1.71 times bigger than the Sun. Our sun has a radius of 6:96 108 meters. Recently obtained Extreme Ultraviolet Explorer (EUVE) observations and reprocessed IUE NEWSIPS data have produced a new, well-defined effective temperature of 24,790 +/- 100 K and a surface gravity of log g = 8.57 +/- 0.06 for Sirius B. Sirius A has a mass of 2 times larger than the Sun, though Sirius B is smaller than the Earth, Sun-like star's mass. Sirius B is a white star that has a surface temperature (in kelvins) that is four times that of our sun. Our sun has a radius of 6.96x108 m. Assuming that Sirius B has the same emissivity as the sun, find the radius of Sirius B. Sirius B, on the other hand, has a diameter of 7.300 mi / 11.800 km, approximatively 92% of Earth’s diameter. 6. From the orbit (and spectroscopic data), we find that Sirius A and B have respective masses of 2.12 and 1.03 times that of the Sun. The Sirius A's solar mass is 2.00 times that of our star, the Sun. If you need the diameter of the star, you just need to multiple the radius by 2. The mass and radius for Sirius B are found to be consistent with the theoretical mass-radius relation for a carbon-core white dwarf. Units pleaseeeee Sirius A has a diameter of about 1.5 million mi / 2.4 million km, almost 171% of the Sun’s diameter. 7. Mass. a) Earth b) Jupiter c) Saturn d) Milky way ... Sirius B is the nearest known white dwarf to the earth. Long-standing questions regarding the temperature, gravity, mass, and radius of the well-known white dwarf Sirius B are considered in light of new data. 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