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Stars that have magnitudes between 1.5 and 2.5 are called second-magnitude; there are some 20 stars brighter than 1.5, which are first-magnitude stars (see the list of brightest stars). For example, Sirius is magnitude −1.46, Arcturus is −0.04, Aldebaran is 0.85, Spica is 1.04, and Procyon is 0.34. Under the ancient magnitude system, all of ...
A difference of 1.0 in magnitude corresponds to the brightness ratio of , or about 2.512. For example, a magnitude 2.0 star is 2.512 times as bright as a magnitude 3.0 star, 6.31 times as magnitude 4.0, and 100 times magnitude 7.0.
735.6 ± 1.5 [5 ] 0.1153 1.66 0.0015 ... star giant planet ... The listed objects currently include most objects in the asteroid belt and moons of the giant planets ...
Of the main-sequence star types, stars more massive than 1.5 times that of the Sun (spectral types O, B, and A) age too quickly for advanced life to develop (using Earth as a guideline). On the other extreme, dwarfs of less than half the mass of the Sun (spectral type M) are likely to tidally lock planets within their habitable zone, along with ...
The mass ratio of this planet with its star is more than 100 times greater than that of Earth and the sun. ... The planet may be similar in size and composition to Neptune, the smallest of our ...
42.7 +1.6 −0.9 [129] Large Magellanic Cloud L/T eff: One of the most luminous and most massive stars. BAT 99-98: 37.5 [130] Large Magellanic Cloud L/T eff: One of the most luminous and most massive stars. HD 5980 A 24 [131] Small Magellanic Cloud L/T eff: A luminous blue variable and one of the most luminous stars.
The planet is located some 1,200 light-years away. A light-year is 5.8 trillion miles. It's the second-lightest exoplanet found so far based on its dimensions and mass, according to the researchers.
A difference of 5 magnitudes between the absolute magnitudes of two objects corresponds to a ratio of 100 in their luminosities, and a difference of n magnitudes in absolute magnitude corresponds to a luminosity ratio of 100 n/5. For example, a star of absolute magnitude M V = 3.0 would be 100 times as luminous as a star of absolute magnitude M ...