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Stars

Color and Temperature

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Constellations

A few bright stars associated with every constellation have been named by different cultures. European and Arabic culture names were assigned by early Roman, Babylonian, Greek, Sumerian, and Arab astronomers. Other cultures, such as Native American and Chinese, have...

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Radial Velocity

This lesson outlines the portions of stellar motions that are towards us or away from us in a direct line: Radial Velocities. This topic was previously introduced in the video lesson: Stellar Motions.

Angular Measurements of the Sky

In Astronomy, and more so, in the subfield of Astrometry, you will often refer to measurements on the sky in a fashion that you are not used to. On Earth, we talk about separations and distances in the Imperial system (inches, feet, etc) or the Metric system (meters,...

Proper Motion

This video lesson is apart of a group of video lessons on Stellar Motion. Consult Radial Velocity and Stellar Motion for a context of how Proper Motion is part of the collective view of how objects in the Universe move. Proper Motion is essentially the tangential...

Parallax

In the continuing effort to discern the distances to objects, astronomers can use a tool, long known to surveyors, as Parallax. Parallax simply measures a shift in object position against a background when the observer is positioned in different locations. Parallax is...

Color and Temperature

This class focuses on a basic understanding of Stellar Temperatures, Colors, and Magnitudes. Why does this matter? The fundamental reason that we study Double Stars is to better understand, and revise, stellar theories that rely on a mass determination. Determining...

Magnitudes: Absolute and Apparent

This class focuses on a basic understanding of Stellar Magnitudes. Magnitudes are how we refer to the brightness of a star. The most fundamental measures of stellar magnitude are: Apparent and Absolute.