The AAVSO Guide to CCD Photometry, first published in September 2014, is designed to be a basic introduction and guide to using CCDs to perform photometry of variable stars. With care, you can use a backyard telescope to obtain astrophysically useful data that matches the quality of those produced by professional astronomers, using exactly the same principles and techniques that are used at larger research observatories around the world.
This page serves as a central location for the tools AAVSO voulnteers are developing and promulgating to help fellow photometrists transform their observations, making them compatible and more useful to the professional astronomy community.
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.
All VPhot processing is done via a web browser. All of the basic photometry tools exist (stacking, time series analysis, control of annulus', transformation, etc.) and the algorithms have been rigorously checked and confirmed to be of the highest quality. Results of the processing are automatically exported in AAVSO Extended Format, meaning you can directly load them into our database via WebObs without having to make any changes to the data file.
Please note that your images will be retained on the server for four months. After this time, they will be deleted automatically to save resources.
If you are a CCD observer the Universe is your oyster. Nearly all the AAVSO program stars can and should be observed with CCDs and science filters. The primary advantages of CCD detectors over visual observers are the potential for very high precision photometry, which facilitates detecting very minute light changes, and the ability to record much fainter stars.