Urban Program – Double and Variable Stars List

Urban Observing Program Coordinator:

Dr. Terry N. Trees
374 Vernon Street
New Kensington, PA  15068-5864
(714) 337-3231
Email: TreesTN@outlook.com

Urban Club Logo
There are actually two lists, one for deep-sky objects, and this one for double and variable stars. All objects are listed in Right Ascension order so that you can view them as they rise in the East and set in the West. Information provided on double and variable stars includes: Object, Right Ascension, Declination, Magnitude, and Separation of the components.

The Urban Observing Program – Double Stars

Urban - Double Stars List
The Urban Observing Program – Variable Star
The Urban Program – Variable Star
Object Name Right Ascension Declination Magnitude (Range) Separation
Beta Perseus (Algol) 03h 08.2m +40° 57′ 2.1-3.4 Variable
(2.9 days)
  1. Determine the dates and times of upcoming Algol minima.
  2. Observe naked-eye and estimate the star’s brightness during a minimum by comparing it to nearby stars.
  3. Repeat the observation and estimate Algol’s brightness on any non-minima night.

Sky & Telescope Magazine’s Minima of Algol column can be found in each monthly issue.  Locate “Celestial Calendar” in the “Observing” section of each issue’s “Table of Contents”.   While the Minima predictions are generally not listed in the Table of Contents, they are usually located just a page or two from the first “Celestial Calendar” page.

You can also find them on the Sky & Telescope Websitehttps://skyandtelescope.org/observing/the-minima-of-algol/
Page down about ½ way until you see the “Initialize to Today” button.  Click it and quickly see the appropriate results.

A finder chart can be printed here:

Use any convenient star chart or planetarium program to determine the magnitudes of neighboring stars, or use:

α Persei 1.8 (alpha Persei)
ζ Persei 2.8 (zeta Persei)
ο Persei 3.8 (omicron Persei)

More information about variable star observing can be found at: http://www.astroleague.org/al/obsclubs/variablestar/VSOIntroduction.html


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