Friday June 9 at 7:30 p.m.

Live at Willcox Hall and via Zoom (link on WAA home page)

Searching for New Physics in the Universe’s Oldest Light

J. Colin Hill, Ph.D.
Columbia University Department of Physics

Dr. Hill will begin with a general review of the state of physical cosmology — what do we know about our universe, and how do we know it? He will then discuss recent and ongoing work focused on attempts to resolve a potential discrepancy amongst some measurements of the current cosmic expansion rate (the “Hubble  tension”). He will then describe how this discrepancy could potentially be resolved via the introduction of new physics into our cosmological model around the time of “recombination”, the moment when photons in the cosmic microwave background (CMB) last scattered in the primordial plasma, a few hundred thousand years after the Big Bang.

He will discuss constraints on these new-physics models derived using the latest CMB data from the Atacama Cosmology Telescope (ACT), as well as new data from Supernova Refsdal just published in May, and will conclude with a look ahead to forthcoming CMB measurements from ACT and the Simons Observatory, which will definitively detect or exclude these scenarios.

Free & open to the public!

 

Friday, May 12 at 7:30 p.m.
LIVE at Willcox Hall, Pace University, Pleasantville or VIA ZOOM
Link to the meeting is on the home page

Introduction to Astrophotography
Jordan Webber, Senior Vice President, WAA

The hobby of astrophotography has changed radically in the last decade with the introduction of CMOS cameras, specialized accessories and powerful image acquisition and processing software. The learning curve can be steep but every journey stars with a single step. This talk will be aimed primarily at folks who don’t know anything about astrophotography and are thinking about getting started or are just interested in how it works in a general sense. More experienced astrophotographers will benefit from Jordan’s experience and may add their insights during the discussion.

 

 

Friday, April 14 at 7:30 p.m.

Starquakes
Christopher Lindsay
Department of Astronomy, Yale University

Christopher Lindsay is a third year PhD candidate and Gruber Science Fellow at the Yale Astronomy department working with Sarbani Basu. He graduated in 2020 from the University of Southern California with degrees in Astronomy, Environmental Studies, and Jazz Studies. He went on to receive an M.S. and M.Phil from the Yale Graduate School of Arts and Sciences in 2022.

Currently, he is  primarily interested in using asteroseismology to study interior mixing and angular momentum transport processes in evolved low mass stars. Understanding what is going on inside stars requires a combination of data analysis and stellar modeling techniques. During his undergraduate studies, he was an observer for the Mount Wilson node of the Birmingham Solar Oscillations Network and studied high angular degree solar oscillations with data from the Solar Dynamics Observatory.

Lindsay was raised on the island of Oahu in Hawai’i, which, due to proximity to the University of Hawai’i’s Institute for Astronomy, spurred his interest in Astronomy from a young age. He’s taken multiple trips to Mauna Kea, including a recent observing run with Keck .

 

 

 

Friday, March 10 at 7:30 p.m.
Live or on Zoom (link on Home page)

Artificial Intelligence and its use in Astronomy
Marwan Gibran, PhD
Chairman of Physics, St. Mary’s College, Notre Dame, Indiana

Artificial Intelligence applications have been used extensively in astronomy over the last decade. This is mainly due to the large amount of data that are recovered from space and ground-based observatories. In the era of big data, the use of automated tools is essential. Dr. Gebran will introduce the most used techniques in Machine and Deep Learning that astronomers are using and show some of their applications. He will present some of his on the use of neural networks for classifying stellar spectra.

Dr. Gibran received a PhD in Astrophysics in 2007 from Montpellier University, France in 2007. He was a post-doctoral fellow in Barcelona working on calibration of the Gaia space telescope. He received a Fulbright grant to work at Columbia University in 2018, and then Joined the Department of Chemistry and Physics at Saint Mary’s College in fall 2021.

 

 

Friday, February 10 at 7:30 pm

Live at Pace University or via Zoom

How Are Orbits Determined?

Dan Platt, PhD

IBM Watson Research Labs & Westchester Amateur Astronomers

When I was young, my family had a book on the history of astronomy. Its discussion of how Gauss determined the orbit of Ceres from the sparse measurements Piazzi had obtained fascinated me. Later, my interests in math and physics led me to celestial mechanics and methods for computing orbits, so I added to my bucket list the goal of doing an orbit calculation from scratch. Now, after many years, I decided to take the question seriously and complete these calculations. The first thing I realized is that there is a lot to it. I needed to understand coordinate systems. I will present a short history of those systems and of the precision required for these orbit methods to work. The second goal was to find how much measurement precision we need today to determine orbital elements. I wanted to see whether commercial telescopes have the precision required to permit us compute orbits. My approach was first to check my code output for known orbits from Stellarium, then to add noise to the “observed” angular measurements, and then see whether I could still compute a reasonable orbit. That will give a standard check if our commercially available scopes can deliver the required precision. As an aside, I’ll tell you just what Tycho Brahe’s fight was about that made his nose famous (and other history).

 

 

 

Friday, January 13 at 7:30 p.m.

Live at Willcox Hall, Pace University, Pleasantville, NY or via ZOOM (link on WAA home page)

Cosmic eras in the infant universe: what was happening during the first billion years?

Paul O’Connor
Instrumentation Scientist, Brookhaven National Laboratory

The more scientists discover about the ingredients that make up our Universe and the ways in which they evolved from a featureless gas to the systems of stars and galaxies that we see today, the more we recognize the need for new observations — ones which can extend our reach across time and space to resolve questions at the foundations of fundamental physics. This has led to an effort within the High Energy Physics community, formerly concerned with particle accelerators to study the subatomic world, to build large facilities and instruments designed to tackle the big open questions of cosmology. This lecture will review progress on Large Synoptic Survey Telescope (Vera Rubin Observatory) construction, and will present several new instrument concepts for studying the physics of the early universe using the highly-redshifted radiation from atomic hydrogen which we observe in the radio frequency wavelength range.

Free and open to the public!

 

 

Friday, December 9 at 7:30 p.m.
David Pecker Conference Room, Willcox Hall, Pace University, Pleasantville, NY
or via Zoom (link on the WAA home page)

DART and the Dinosaurs

Dany Waller
Johns Hopkins Applied Physics Laboratory

The bold, ingenious and successful DART mission may make it possible to prevent devastating asteroid impacts that could wipe out much of life on Earth. Dany Waller is a member of the DART team at JHU-APL. She’ll discuss the risks of asteroid impacts and review the planning, execution and results of the DART mission.

The December meeting is also the official Annual Meeting of WAA, at which the officers will be elected.

 

 

Friday, November 11 at 7:30 pm

David Pecker Conference Room
Willcox Hall, Pace University, Pleasantville, NY
or on-line via Zoom

The McCarthy Observatory: A Refuge for Science

Bill Cloutier
Founding member, McCarthy Observatory

The McCarthy Observatory is the centerpiece of a community science center in New Milford, Connecticut. It was conceived, designed and constructed by volunteers from the local communities with a common goal  to establish a teaching tool to promote science literacy.

The observatory is different from many other astronomical facilities in that its focus is on accessibility and educational outreach. While capable of real science, the mission of the non-profit organization that operates the facility is to encourage critical thinking and promote STEM-related learning. Over the past 22 years, the all-volunteer staff has continued to add to the observatory’s educational offerings and look for new and innovative means to engage with the public.

The talk will focus on the history of the McCarthy Observatory, as well as the challenge of managing a small, all-volunteer organization with lofty goals.

Bill Cloutier is an amateur astronomer and founding member of the McCarthy Observatory. He is also on the Board of Directors that oversees the all-volunteer, non-profit organization that operates and maintains the Observatory, which opened to the public in December 2000. Bill is the author of the observatory’s monthly newsletter, covering topics related to astronomy and space exploration, a regular presenter at public events, an adult education classroom instructor for a night sky appreciation course, NEO observer, and the caretaker/public outreach coordinator for the observatory’s antique refractor telescope. Before retiring, Bill worked in the nuclear industry for 42 years. He has had a life-long interest in astronomy, lunar photography, the history of lunar exploration, and sharing those pursuits with the public. He is also a NASA Solar System Ambassador, a volunteer outreach initiative conveying the latest happenings in space exploration to the general public to generate interest in the STEM disciplines.

 

 

Friday, October 14 at 7:30 p.m.
David Pecker Conference Room, Willcox Hall, Pace University, Pleasantville, NY
or on-line via ZOOM

A Synthesized View of Planetary Systems
Malena Rice, PhD
Massachusetts Institute of Technology

A tremendous diversity of exoplanets and protoplanetary disks has been discovered over the past three decades, offering an unprecedented lens into the range of formation pathways available for planetary systems. In parallel, studies of the solar system have revealed tantalizing, complementary constraints with exquisite detail. I will describe how, taken in conjunction, these two lines of evidence can be combined to advance our current understanding of planetary systems.

Drawing from the relationship between stars, planets, and neighboring minor planets, I will focus on the interface between subfields. I will discuss how minor planets, including interstellar objects and distant solar system bodies, provide evidence for hidden, wide-orbiting planetary perturbers in both the solar system and extrasolar systems. I will also describe a novel algorithm to directly search for the most distant solar system objects using the TESS dataset. Then, I will highlight how observational constraints on planetary system architectures and compositions provide complementary information regarding the key planet formation pathways. I will conclude with the prospects for future constraints on planetary system evolutio

Malena Rice is a 51 Pegasi b Fellow at the Massachusetts Institute of Technology, where her research focuses on planetary system dynamics. Originally from Simi Valley, California, she earned her Bachelor’s degrees in Physics and Astrophysics from UC Berkeley in 2017 and her M.S. (2020), M.Phil. (2020), and PhD (2022) in Astronomy at Yale University. Outside of her degree work, Malena has also conducted research at the NASA Goddard Space Flight Center and at the University College London. Malena is passionate about STEM education and accessibility, and she regularly leads both public outreach events and graduate-level teaching workshops. In her free time, she enjoys playing the flute and piano, visiting art galleries, reading, traveling, and spending time outdoors.

 

 

Join your fellow club members to hear about a wide range of astronomy topics. Members’ Night is one of our favorite traditions. Topics range from equipment, techniques, observations, trips, teaching techniques and even creative arts.

Members are asked to present topics in 10-15 minute segments.

Members interested in presenting should contact Pat Mahon at
waa-programs@westchesterastronomers.org.

Live or on-line: your choice!