Editing Algol (section)

==Observing Algol==

The Algol system usually has an apparent magnitude of 2.1, similar to those of [[Mirfak]] (α Persei) at 1.9 and [[Almach]] (γ [[Andromeda (constellation)|Andromedae]]) at 2.2, with whom it forms a right triangle. During eclipses it dims to 3.4, making it as faint as nearby [[Rho Persei|ρ Persei]] at 3.3.
{| class="wikitable"
 |+ Observing Algol's Eclipses in 2025<ref>Edgar, James S. (editor). ''Observer's Handbook 2025''. The Royal Astronomical Society of Canada. {{ISBN|9-781927-879375}}.</ref><ref>{{cite web|url=https://www.skyandtelescope.com/observing/celestial-objects-to-watch/the-minima-of-algol/ |title=The Minima of Algol |last=Ashford |first=Adrian |date= 30 July 2006|accessdate=2024-12-04}}</ref>
 |-
 ! Date
 ! Time
 |-
 ! December 1, 2024
 | 18:52
 |-
 ! January 2, 2025
 | 07:53
 |-
 ! February 2, 2025
 | 20:55 
 |-
 ! March 3, 2025
 | 13:09 
 |-
 ! April 1, 2025
 | 05:22
 |-
 ! May 2, 2025
 | 18:23
 |-
 ! June 3, 2025
 | 07:22 
 |-
 ! July 1, 2025
 | 23:30
 |-
 ! August 2, 2025
 | 12:25
 |-
 ! September 3, 2025
 | 17:35
 |-
 ! October 1, 2025
 | 01:20 
 |-
 ! November 2, 2025
 | 06:23 
 |-
 ! December 3, 2025
 | 19:22
 |}

[[image:Perseus - Prodromus astronomiae 1690 (5590393).jpg |thumb |The constellation Perseus and Algol, the Bright Star in the Gorgon's head ([[Johannes Hevelius]], ''Uranographia'', 1690)]]
Listed are the first eclipse dates and times of each month, with all times in UT. β Persei Aa2 eclipses β Persei Aa1 every 2.867321 days (2 days 20 hours 49 min). To determine subsequent eclipses, add this interval to each listed date and time. For example, the Jan 2 eclipse at 8h will result in consecutive eclipse times on Jan 5 at 5h, Jan 8 at 1h, Jan 10 at 22h, and so on (all times approximate).