monochromatic magnitude

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The measurement of a star's brightness at a single wavelength. Such magnitudes are important in assessing the variations in magnitude to be expected when a given star is observed ...

position circle

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A circle on the Earth's surface on which the observer is situated at some point. The center of the circle is directly under a celestial body, and its radius is equal to the zenith ...

nebular variable

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Any of the various types of eruptive variable closely associated with nebulosity. Most are young stars of the FU Orionis or T Tauri types that undergo irregular outbursts of up to ...

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