Search a database of over 300,000 variable stars to find the information you need to support your variable star observing program. Variable Stars is a great astronomy resource for anyone for observing or general reference.

View and search by:
• Star magnitude
• Constellation
• Star name or Variable Star Index (VSX) ID
• Period
• Spectral type
• Variable type

Rise, transit, and set times are also available for each star to help plan your observations.

Simplify your observing plan by selecting one of the 9 pre-made lists of stars based off of AAVSO's (American Association of Variable Star Observers) observing sections.

Local and current astronomy with the What's Up mode:
• 200 of the best placed stars for observing right now
• Configure the criteria used to refine the list including magnitude and period ranges to fit your observing setting
• Sort by star name, constellation, visibility, or magnitude