Hobbyist Astronomer Develops App used for Hubble Space Telescope

Created with Xojo, AstroPlanner now used by more than 5000 astronomers




In 2001, Paul Rodman, an amateur astronomer from Seattle decided to take his interests to the next level. He bought a Meade LX200 telescope and discovered he could program a computer to control it. The only problem was he wanted to use his Mac and at that time there were very few Mac astronomy applications available. In particular, there were no applications for planning and executing observing sessions. Paul has a background in computer science and decided he could just build one himself.

Paul had worked with other programming tools to compile applications on the Mac, but felt most of them were too time consuming. He was looking for a rapid, cross-platform application and after learning about Xojo online, Paul was sold.


In just six short months Paul produced an astronomer’s planning app and shared it with other Mac-based astronomers. They were equally pleased and before he knew it, he was getting requests for a Windows version. Today AstroPlanner is used by more than 5000 amateur astronomers to facilitate astronomical observation planning, visualization and logging, as well as control of telescopes with computerized go-to mounts or digital setting circle controllers. AstroPlanner helps astronomers figure out what to look for in the sky, when the best time would be, and then helps them do the actual observing by logging observations and controlling their telescopes.

While most users are amateurs, in 2004 Paul learned AstroPlanner was being used at the University of Toronto to help astronomers plan observations for the Hubble Space Telescope. Astronomers are also using the software in the USA and Australia to plan asteroid photometry and astrometry programs, and to automate extragalactic supernova search efforts using robotic telescopes.

In addition to AstroPlanner, Paul has written several support applications using Xojo to handle customer tracking, bug tracking, and construction of FAQs. He’s also working on an application that emulates various types of commercial telescopes, along with an app that will allow his users to share astronomy hardware information via a central database.

Supporting Quotes — Paul Rodman, creator of AstroPlanner

The Real Solution

Paul determined Xojo was best because of the following critical features:

AstroPlanner in Action

Long time Xojo user and amateur astronomer, Tim Jones, uses AstroPlanner for deciding which objects to highlight for the public crowds at the Saguaro Astronomy Club and Phoenix Astronomical Society's public outreach star parties. By working through things in AstroPlanner before the event, it's much easier to be prepared compared the old method of searching for objects while the line for the telescope gets longer and longer.

"Being able to show information about the targets on my Mac Book Air adds greatly to the experience for all attendees." says Tim. "AstroPlanner is one of the biggest bargains for amateurs looking to improve their field time behind the eyepiece or with a camera. The number of features in AstroPlanner can be found in other Astronomy packages, but you'd need to combine multiple packages to get them all at almost 15x the price of AstroPlanner."