Transforms: Everything you need to transform your CCD observations

Announcement: New Forums

We are excited to announce the launch of our new forums! You can access it forums.aavso.org. For questions, please see our blog post. The forums at aavso.org/forum have become read-only.

Announcement: New Applications

We are excited to announce the launch of our new applications! We're opening up early access to our new applications for searching, downloading, and submitting photometric observations. You can now access these applications through these links:

• Global Data Search (new) – Search across all of AAVSO’s databases
• Search and Download Photometric Observations – Search and export results in CSV, JSON, or XLSX
• Submit Photometric Observations – Review your observations on a light curve with historical data

We ask for your feedback in order to help us improve these applications. Please send feedback for the applications above to feedback@aavso.org. Note: please avoid duplicating submissions across the two submit applications.

This page serves as a central location for the tools AAVSO voulnteers have developed and promulgated to help fellow photometrists transform their observations, making them compatible and more useful to the professional astronomy community.

These include:

Standard Field Charts - Use these special charts of "Standard Fields" to start the process. Standard fields are star fields for which the magnitudes of selected stars are known very precisely in several colors. For your convenience, the AAVSO has prepared standard sequences for a number of star clusters, which were selected on the basis of several factors including their range of colors and quantity of stars that will conveniently fit into one CCD image.
Transform Generator (TG) - A tool to compute the transform coefficients. Details of this program can be viewed at: http://www.aavso.org/tg TG is a Python application that will run in Windows, Mac, Ubuntu and Linux environments. Author: Gordon Myers.
TransformApplier (TA) - This tool will take your coefficients and observations and output transformed data. To learn more about this useful tool and download it to your computer please visit http://www.aavso.org/transformapplier. If you subscribe to this page, you will be notified of any changes or updates to the code. TA is a Windows application. Documentation is included in its help screen. Author: George Silvis.
Boxter & AAVSO Report Utilities - Tools for aggregating your observations (including timeseries). These programs can be downloaded together in a zipped file. For Windows users only. Author: Richard Sabo.