Uploaded February 2025 | Updated September 2026, 1 week ago
Professor Dan Milisavljevic (Purdue University) reviews the plans for a coordinated global response to the next supernova in our Milky Way galaxy. The first alert that the “Big One” has happened will come from the Supernova Early Warning System (SNEWS), which is a network of neutrino detectors around the world. The neutrinos will arrive minutes to hours ahead of the first photons, which gives observers little time to locate and monitor the star as the explosion is happening.
*Timestamps:*
00:00 Opening announcements
03:39 Introduction - Bert Pablo
05:04 Presentation - Dan Milisavljevic
53:10 Presentation - George Silvas
00:00 Audience members share their AAVSO stories
1:12:20 Closing announcements
*✩ Interested in attending a live AAVSO webinar on Zoom?* Visit aavso.org/webinars to view our schedule and register for upcoming events.
Professor Dan Milisavljevic (Purdue University) reviews the plans for a coordinated global response to the next supernova in our Milky Way galaxy. The first alert that the “Big One” has happened will come from the Supernova Early Warning System (SNEWS), which is a network of neutrino detectors around the world. The neutrinos will arrive minutes to hours ahead of the first photons, which gives observers little time to locate and monitor the star as the explosion is happening.
*Timestamps:*
00:00 Opening announcements
03:39 Introduction - Bert Pablo
05:04 Presentation - Dan Milisavljevic
53:10 Presentation - George Silvas
00:00 Audience members share their AAVSO stories
1:12:20 Closing announcements
*✩ Interested in attending a live AAVSO webinar on Zoom?* Visit aavso.org/webinars to view our schedule and register for upcoming events.





![AAVSO How-to Hour: Spectography on a Budget
[Closed captioning for this webinar is available by clicking the [ cc ] or [ . . . ] icons above. In our April 1, 2021 How-to Hour, guest instructor Lauren Herrington reveals how you can use the drift scanning method to record scientifically useful spectra of tens of thousands of stars using nothing but a camera, diffraction grating, and an untracked telescope.
She also discusses how to optimize your resolution, so that you can use your slitless grating to record fine details, such as the blueshifted absorption lines originating in the torrential stellar wind of P Cygni.
Lastly, she demonstrates how to process and calibrate your spectra, and how to submit your processed spectra to the AAVSOs database.
No prior knowledge is necessary, but viewers will likely find it beneficial to know ahead of time what the terms spectrum, absorption, and emission mean as they relate to astronomy, and how to operate a simple telescope. Recommended pre-view reading: http://spiff.rit.edu/classes/phys301/lectures/spec_lines/spec_lines.html
Explore AAVSO and find out how YOU can make a meaningful contribution to science at aavso.org (our Spectroscopy Observing Section is at https://www.aavso.org/spectroscopy-observing-section) AAVSO How-to Hour: Spectography on a Budget](https://i.ytimg.com/vi/P56Jud6iRSc/mqdefault.jpg)




