The Astronomical Society of Greenbelt is an organization made up of people in and around Greenbelt, MD who are interested in astronomy. The group's objective is to educate people about the fascinating science and hobby of astronomy. Persons of all knowledge and skill levels, whether members of the Society or not, are welcome to attend activities.

Up to the start of the pandemic (late March 2020) regular meetings, normally featuring a presentation by an authority on some astronomical topic, were (usually) held on the last non-holiday Thursday of each month at the Greenbelt Community Center.

Star parties were held on selected Saturdays -- and other days for notable events -- at the City of Greenbelt Observatory on Northway (extended) in Greenbelt. Visitors were welcome to set up their own telescopes on the hill there./p>

All of ASG's remaining 2020 scheduled events, including meetings at the Greenbelt Community Center and star parties at the Greenbelt Observatory, were cancelled in late March due to the pandemic. And they remain cancelled. However, we resumed operations in mid-June in an online mode.

Online (Zoom) lectures will be announced here and on our calendar as soon as possible, and in the Greenbelt News Review and by groups.io post (see below) shortly before the event. These events are open to the public, not just to ASG members.

Online (Zoom) star parties likewise will be announced here, and on our calendar, and by groups.io post as soon as practical, using the National Weather Service six-day weather forecast as a guide to scheduling these events. ASG members are operating telescopes in their backyards and screen-sharing the observing experience. The objects observed include solar system planets and deep sky objects such as galaxies, nebulae and star clusters---whatever is currently high enough in the sky to not be blocked by surrounding houses and trees. Attendees are welcome to comment and ask questions. These events too are open to the public, and not just to ASG members. If you would like to be notified by email when a star party is imminent you can write to the ASG Observatory Chair (see Contacts) and request that your email address be added to a list.

Online Lecture - Thurs., 29 Apr 2021, 7:30 PM:  "Ocean worlds of the solar system: evolution, inner workings, and habitability," Dr. Marc Neveu, Research Scientist at the Goddard Space Flight Center and at the University of Maryland:
    Solar system exploration by spacecraft in the past few decades has revealed the existence of oceans hidden beneath the icy surfaces of moons and dwarf planets. This has opened fascinating new avenues of research on how these oceans came to be, how long they may last, how they affect the evolution of their host world, and whether they may provide distant abodes for life. Earth oceanographers and planetary scientists are now starting to learn from one another insights from our own and other oceans, fostering what promises to be a fruitful new era of ocean science and exploration. I will present this broader context and illustrate it with examples from my research.
   The Zoom session will open at 7:00 PM for meet-and-greet.  All are welcome, whether ASG members or not.  Zoom connection details can be found on our Events page calendar a few days before the event.

ASG links:

ASG message server (groups.io/g/greenbeltastro)

2020 ASG brochure (All events will be online until further notice)

2020 ASG star party schedule (All scheduled events have been cancelled until further notice)

"Star Parties at Greenbelt Observatory" (What to expect, when life returns to normality)

"ASG favorite images" (A picture gallery)

Old news:

News, 17 Mar 2020:  Sebastian Rivera-Muñoz, a student at Eleanor Roosevelt High School in Greenbelt, has completed his senior year Research Project, the development of an image sharpening algorithm now incorporated in ASG's "QuickStack" live-stacking application currently in use at Greenbelt Observatory to enable the observation of very faint cosmological "deep sky objects." Sebastian developed his algorithm, called "2Delta-PSF" (for two times a delta function minus the point spread function), using Microsoft Visual C++, an application development system he mastered (well enough for his purpose) during the course of the project. The beauty of his algorithm is that it uses the telescope-and-camera's image of a star to automatically determine the proper degree of sharpening required, making the process quick and easy to use at ASG star parties. Sebastian compared his algorithm with a standard astronomical image sharpening algorithm called the "Lucy-Richardson deconvolution algorithm," and we deemed his algorithm superior with regard to the aspects important to us (fewer artifacts and acceptable processing time). His mentor for the project was Conrad Terrill of ASG.