The first observatory to adopt ASCOM was Junk Bond Observatory, in early 1998. It was used at this facility to implement a robotic telescope dedicated to observing asteroids. The successful use of ASCOM there was covered in an article in Sky & Telescope magazine. This helped ASCOM to become more widely adopted.
The ASCOM standards were placed under the control of the ASCOM Initiative, a group of astronomy software developers who volunteered to develop the standards further. Under the influence of Denny, George, Tim Long, and others, ASCOM developed into a set of device driver standards. In 2004, over 150 astronomy-related devices were supported by ASCOM device drivers, which were released as freeware. Most of the drivers are also open source.
As ASCOM developed, the term became less associated with the Component Object Model, and has been used more broadly to describe not only the standards and software based on them, but also to describe an observing system architecture and a robotic telescope design philosophy. In 2004, ASCOM remained formally a reference to the Component Object Model, but the term is expected to stand on its own as new technologies such as Microsoft .NET take over functions provided by the Component Object Model, and additional ASCOM projects are adopted that dilute its concentration on device drivers.
ASCOM defines a collection of required Properties and Methods that ASCOM compliant software can use to communicate with an ASCOM compliant device. ASCOM also defines a range of optional Properties and Methods to take advantage of common features that may not be available for every manufacturer's device. By testing various properties an ASCOM client application can determine what features are available for use.
An ASCOM Platform software package is available for download which installs some common libraries and documentation as well as a collection of ASCOM drivers for a broad range of equipment. Additional ASCOM drivers for devices not included in the ASCOM Platform package can be downloaded and installed separately.
Although ASCOM is predominantly used by the amateur community, because the standard is freely available it is also used in some professional installations.
ASCOM drivers allow computer based control of devices such as using planetarium software to direct a telescope to point at a selected object. Using a combination of mount, focuser and imaging device ASCOM drivers, it is possible to build a fully automated environment for deep sky imaging.