Caption This is an example of what users see when they type in the celestial coordinate of an object to view a time-series light curve or download a computer-readable file of all observations in ...

From this light curve, the author obtained the star’s period of 31.91 days, peak apparent magnitude of 18.6, minimum apparent magnitude of 19.8, average apparent magnitude of 19.2, and amplitude ...

To estimate the changing brightness of a variable star, such as Algol (Beta [β] Persei), it’s best to directly compare it to other nearby stars of known magnitudes (marked above in green). The ...

Light curve of the variable star Grigoriev 1 from the Zwicky Transient Facility (ZTF) project. Green circles—observations in g filter, red diamonds—in r filter. Credit: arXiv (2025).

Normally, Algol appears 3.3 times brighter than during the peak of the eclipse; it usually shines at magnitude 2.1, about equal to the star Almach (Gamma Andromedae), but at intervals of 2.867 ...