Longmont Astronomical Society


To view a presentation given to the Longmont Astronomical Society, click on a link below.

Science and Observations of the Chilean Eclipse of 2019 by Jim Elkins, February 20, 2020

Balloon Observations of Earth, Moon and Total Solar Eclipse by Jim Elkins, August 15, 2013

Understanding the Earth's Atmosphere Better with Unmanned Aircraft Systems by Jim Elkins, November 18, 2010

Previous Monthly Meeting Talks

May 2021

Juno Update at Jupiter: What’s Happening to the Great Red Spot?

Fran Bagenal, University of Colorado, Boulder


Great Red SpotThe giant planet Jupiter is recognized by its orange and white stripes—and its Great Red Spot (GRS). A large red storm in Jupiter’s atmosphere has been observed by modest Earth-based telescopes for centuries. In 1979 the Voyager spacecraft made movies of the GRS which showed that it is about the size of two Earth diameters and had hurricane-scale wind speeds that circulated in six days. Since July 4, 2016, NASA’s Juno spacecraft has been in orbit around Jupiter and made more than 30 orbits over Jupiter’s poles. Fortuitously, in the past year, Juno made some passes close to the GRS, providing new measurements of the depth of the storm and its turbulent atmospheric structures. In this talk, LASP scientist Fran Bagenal will show how Jupiter’s Great Red Spot has been observed by telescopes on Earth as well as from spacecraft near Jupiter. The storm has noticeably shrunk in size over the past 40 years…Will it disappear? Will it grow back to the size it was during the Voyager epoch? 

Dr. Fran Bagenal was born and grew up in England. In 1976, inspired by NASA’s missions to Mars and the prospect of the Voyager mission, she moved to the US for graduate study at MIT. After Voyager flybys of Jupiter, Saturn, Uranus and Neptune she joined the faculty at the University of Colorado, Boulder in 1989. She was professor of Astrophysical and Planetary Sciences until 2015 when she chose to focus on NASA’s New Horizons mission to Pluto (flyby July 14, 2015) and Juno mission to Jupiter. Juno went into orbit over the poles of Jupiter on July 4, 2016 and has since made 33 passes over Jupiter’s swirling clouds. She remains a Research Scientist at CU’s Laboratory for Atmospheric & Space Physics in Boulder.

April 2021

How do Galaxies Get their Shapes?

Dr. Angela Collier

Astronomers classify galaxies into three categories, based on their morphology: elliptical, spiral and irregular. Each type of galaxy spans a wide range of size, kinematic properties, and chemical makeup. The appearances of galaxies are shaped over billions of years by interactions with other galaxies and internal dynamical processes. While we do not know for sure how galaxies form to take these different shapes observed today we can find clues in galactic simulations. I will discuss the current state of the field and my own work on dark matter interactions within galaxies. 

Angela Collier is a theoretical physicist who explores the role of dark matter interactions in large scale secular dynamics through analytical calculations and numerical simulations. She currently works at JILA and CU Boulder as a research postdoctoral fellow in the Eccentric Dynamics Group. She is originally from eastern Kentucky.

March 2021 

All These Worlds: The Exoplanet Revolution

For generations we've wondered whether we are alone in the Universe. Thanks in large part to space missions like Kepler, we now know that we live in a galaxy full of diverse planetary systems. Not only are we detecting planets around thousands of other stars, we are beginning to characterize them as well, revealing the vast stage for the play of life in the Universe.

Dr. Daniel D. Durda is with the Southwest Research Institute in Boulder.  He has more than twenty-five years of experience researching asteroids, Vulcanoids, Kuiper belt comets, and interplanetary dust, including airborne astronomical observations from high-performance jet aircraft.  He is an active pilot with time logged in over a dozen types of aircraft and has more than 110 minutes of time conducting experiments on NASA’s zero-gravity KC-135 aircraft. He has co-authored a book, published numerous articles popularizing planetary science and human exploration of space, and has appeared in more than 70 television science documentaries. Dan is an experienced cave diver and participates in underwater cave rescue and recovery missions.

February 2021

The virtual tour of the Astronomical Lyceum in Magdalena, New Mexico with Dr. John Briggs is still available. To see the presentation Dr. Briggs gave to LAS, click here.

Virtual Star Party Presentation

Dr. Brian Ottum gave a great talk on January 31st about a virtual star party using a remote telescope to view Orion. It's still available on YouTube.

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The Longmont Astronomical Society is a 501(c)3 non-profit organization. P.O.Box 806, Longmont, CO 80502-0806, USA

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