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Denebola star of the constellation Leo, of magnitude 2.2, spectral class A2, away from Earth 34 years-light.

Having a declination of + 14 °, Denebola is a star of the northern hemisphere. However, its proximity celestial equator is visible from all populated areas of the Earth. In particular, it is invisible only from the inner regions of the Antarctic continent.

On the other hand, its location makes it Circumpolar only near the North Pole.

Having a magnitude of 2.13 is easily distinguishable from areas moderately affected by light pollution. Denebola is a star of spectral type A 3-V, with a surface temperature of about 8700 K. It has a mass of 75% higher than that of the Sun, 73% more of its radius and has a luminosity about 14 times higher to sunlight.

Denebola is a star relatively young, younger than the estimated 400 million years and is classified as a variable star Delta Scuti, which means that its brightness varies very slightly in the course of a few hours. The Denebola rotation speed is quite high, about 165 km / s, and this leads to make a rotation on itself in less of 0.65 days and to have a shape flattened at the poles and an equatorial bulge, similar to that Achernar.

Denebola shows a large excess of radiation in the wavelength of the infrared, which means that in orbit around the star probably is a low-temperature dust disk. As it is believed that our solar system has originated from a similar hard, so Denebola and similar stars, like Vega and Beta Pictoris, could be candidates to host exoplanets.

The dust that surrounds Denebola has a temperature of about 120 K. They were made later attempts to display the circumstellar disk, but without success; from this, it is clear that the disc is much smaller than that which surrounds, for example, Beta Pictoris. Interferometric observations in infrared light appear to highlight the presence of two circumstellar disks; the inner disk extends from 0.13 to 0.3 AU, while the second is a ~ 13 AU and would have a width of 6.2 AU.



To open the video, click on the picture, good view from your Alessandro Brizzi.