Comet Tsuchinshan-ATLAS will likely become similarly bright and active when closest to the Earth in. ![]() Comet ZTF (C/2022 E3) makes a picturesque pair with Mars on February 10th. Check out our forecast of what to expect to see in the months ahead. If you see any problems with this tool, or any of our interactive tools, please send an email to. Newly discovered Comet C/2023 A3 might reach naked-eye brightness when it flies past Earth in 2024. The orbital period of the binary undergoes slight but unpredictable long-term drifts. In December 2021 we revised the prediction formula to better match Algol’s current minima. The times given should be accurate to within a few minutes. Or you can enter any current date to see the dates and times of eight consecutive minima. Click "Initialize to today" to view the dates and times of Algol's minima for the next three weeks. (For detailed tips on estimating a variable's brightness, see "The Lure of Variable Stars." For information and finder charts for Algol and 11 other inconstant stars, see "The Top 12 Naked-Eye Variable Stars.") Below is a calculator you can use to predict when Algol will be at mideclipse. You can compare Algol's brightness with them at a glance click on the star chart to see a larger version with the magnitudes of several comparison stars clearly labeled. Good comparison stars are Gamma (γ) Andromedae to Algol's west, magnitude 2.1, and Epsilon (ε) Persei to its east, magnitude 2.9. Algol stays nearly that faint for two hours centered on the time of mideclipse, and it takes several additional hours to fade and to rebrighten. In the middle of an eclipse it shines dimly at magnitude 3.4 instead of its usual 2.1. Its changes are very plain to the naked eye. Algol fades and rebrightens like clockwork every 2.87 days. ![]() You can check on it whenever you step outdoors on nights when Perseus is in view. Sky & Telescope The star Algol (β Persei) was the first eclipsing variable star ever discovered, and it's still the most famous one. Good comparison stars are Gamma Andromedae to Algol's west, magnitude 2.1, and Epsilon Persei to its east, magnitude 2.9. The star Algol (Beta Persei) was the first eclipsing variable star ever discovered. ![]()
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