comparison star

comparison star

[kəm′par·ə·sən ‚stär]
(astronomy)
A star of known brightness used as a standard for comparison in determining the magnitude of a nearby celestial object.
References in periodicals archive ?
The Magnitude scale was derived from a virtual comparison star and is only an approximation for V mag.
A good comparison star system is HR 8799, which has four known planets that sweep up the space between two similar disks of debris.
The brightness of each was compared with that of two supposedly constant stars, the comparison star and the check star that were close on the sky to the variable star.
The sixth column of Table I lists the comparison star used for each measurement.
Due to a problem with the comparison star the data were not analyzed.
The B, V, R and I measurements of NGC 7027 were usually made first which was then followed by B, V, R and I measurements of the comparison star.
Mu-Leonis was the comparison star and Epsilon-Leonis was the check star for all magnitude measurements.
02 magnitudes when using a calibration method involving the Canopus add-on, Comparison Star Selector, which picks comparison stars of similar colour and magnitude to the target star.
Each measurement consisted of the sequence CSCSCSKC where C is the comparison star measurement, S is the Saturn measurement and K is the check star measurement.
For eclipse 1, alpha Bootes was the comparison star, while alpha-Lyrae was the comparison star for eclipse 2; star magnitudes are listed elsewhere (5).
The comparison star for all measurements was iota Geminorum; the magnitudes were taken from Iriarte et al.
08 V magnitude comparison star (TYC 3991-1480-1) together with a 10.

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