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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.
Eta Leporis, Latinised from η Leporis, is a single, [10] yellow-white-hued star in the southern constellation of Lepus, the hare. It is visible to the naked eye with an apparent visual magnitude of approximately 3.72. [2] The annual parallax shift of 67.21 mas yields a distance estimate of 49 light-years.
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 ...
The strong geomagnetic storm that created such a show has subsided, according the National Oceanic and Atmospheric Administration, but some parts of the U.S. may again see the northern lights ...
The northern lights are expected to be strongest between Friday, Jan. 31, and Saturday, Feb. 1. The best time to view them is from 10:00 p.m. and 2 a.m. local time.
From full moons to meteor showers, there have been numerous celestial events to enjoy this year—but the show isn't over yet.On Wednesday, December 4, stargazers are in for a treat as the two ...
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.
One star, catalogued J205551.3+435225, fulfilled all the criteria. Lying right in the centre of Sh2-117, with a temperature of over 40,000 K, it is almost certainly the ionising star for the North America and Pelican nebulae. [12] Later observations have revealed J205551.3+435225 is a spectral type O3.5 star, with another hot star (type O8) in ...