Year of the Comet
Comet C/2011 L4 (PANSTARRS)

PANSTARRS information

Comet C/2012 S1 (ISON)

ISON information

Web Extras

How to make a variable-star estimate

Learn how to make your own light curves so you too can help contribute to the American Association of Variable Star Observers.
Contributed by David H. Levy
Published: April 25, 2011
T-CrB-chart
The American Association of Variable Star Observers creates charts like this one for T Coronae Borealis to help observers make magnitude estimates. American Association of Variable Star Observers
At its most basic level, variable-star observing is a simple task. First, locate the targeted variable in the sky. Next, find some nearby stars with known magnitudes, which will allow you to make your estimate. Simply compare the target to the known-magnitude stars and estimate how much brighter or dimmer it appears.
Subscriber-Only Content Subscriber Only Access
You are currently not logged in. This article is only available to Astronomy magazine subscribers.
Already a subscriber to Astronomy magazine?
If you are already a subscriber to Astronomy magazine you must log into your account to view this article. If you do not have an account you will need to regsiter for one. Registration is FREE and only takes a couple minutes.
Login   Register
Non-subscribers, Subscribe TODAY and save!
Subscribe
Get instant access to subscriber content on Astronomy.com!
  • Access our interactive Atlas of the Stars
  • Get full access to StarDome PLUS
  • Columnist articles
  • Search and view our equipment review archive
  • Receive full access to our Ask Astro answers
  • BONUS web extras not included in the magazine
  • Much more!
SEARCH SITE
Subscriber Only Access
Subscriber Only Content
Look for this icon. This denotes premium subscriber content. Learn more »
Become a Member of Astronomy.com
Register today for access to more valuable resource information.
Interact in our forums, comment on articles, receive our newsletter and much more!
Not a member?
Subscriber and Member Login
Password
Remember me