A) Introduction
To find the rotational rate of an asteroid, we need to become familiar with the tools available within the image processing software, Afterglow Access (AgA). Section 2 will accomplish this goal by examining Messier objects and asteroid images with this software. We will also use some of our new programming skills with the Quorum language to understand the “behind the scenes” workings of Afterglow Access.
**NOTE: We will be visiting the tools on Afterglow Access many times in this section, with explanations given throughout. Please be patient with yourself as your understanding grows.
***Leaders/Teachers: Be sure to visit the resource page for IDATA Section 2 Help sheets and Journal Answers.
Let’s start with this 1:52 video in which Chris introduces the idea of objects with changing brightness:
Group Discussion: Why would objects vary or change in brightness?
Teachers: Refer to the link below for a resource to guide the discussion. (It can also be found on the SJS portal by going to the top of any page, clicking on “Resources”, then “For IDATA” and then scrolling down to Section 2)
Use the Journal Box below to record your ideas.
1. List as many ideas as you can about why an object might vary or change brightness – no idea is too wild!
2. List some objects in space that you think vary in brightness.
3. List as many ways, including accessible ways, in which the varying light can be quantitatively measured (which means “using numbers”).

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