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In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower the color index, the more blue (or hotter) the object is. Conversely, the larger the color index, the more red (or cooler) the object is.
Effective temperature of a black body compared with the B−V and U−B color index of main sequence and supergiant stars in what is called a color-color diagram. [1] Stars emit less ultraviolet radiation than a black body with the same B−V index. Although stars are not perfect blackbodies, to first order the spectra of light emitted by stars ...
In between the two distributions is an underpopulated space known as the green valley which includes a number of red spirals. Like the comparable Hertzsprung–Russell diagram for stars, galaxy properties are not necessarily completely determined by their location on the color–magnitude diagram. The diagram also shows considerable evolution ...
The northern lights will be visible for parts of the northern U.S., according to the NOAA Space Weather Prediction Center's aurora forecast. The aurora will be visible over much of Canada and ...
Set to pass between the star and Earth is Leona, a slightly oval-shaped asteroid located between the orbits of Mars and Jupiter. Leona is estimated to be about 50 miles (80 kilometers) by 34 miles ...
Main-sequence stars vary in surface temperature from approximately 2,000 to 50,000 K, whereas more-evolved stars – in particular, newly-formed white dwarfs – can have surface temperatures above 100,000 K. [3] Physically, the classes indicate the temperature of the star's atmosphere and are normally listed from hottest to coldest.
This was done so the color index of these stars would be 0. [13] Although this system is often called "Vega normalized", Vega is slightly dimmer than the six-star average used to define magnitude 0.0, meaning Vega's magnitude is normalized to 0.03 by definition.
Zeta Puppis (ζ Puppis, abbreviated Zeta Pup, ζ Pup), formally named Naos / n aʊ s /, [10] is the brightest star in the constellation of Puppis.. The spectral class of O4 means this is one of the hottest, and most luminous, stars visible to the naked eye.