Northern Virginia Astronomy Club

Northern Virginia Astronomy Club
The most recent resolved images of Supermassive Black Holes (SMBHs) at the center of M87 (SMBH: M87*) as well as the Milky Way (SMBH: SgrA*) by the Event Horizon Telescope Collaboration (EHTC) has opened up a very promising era of precision (supermassive) Black Hole astrophysics. Thanks to the Event Horizon Telescope, we have now a horizon-resolved image of a few Supermassive Black Holes, as well as some knowledge about the structure of the magnetic field and the accretion flow around some BHs. Inspired by this discoveries, in this talk, Dr. Emami will speak about different aspects of the recently-reported (yet) un-polarized images of SgrA*. She will then continue with the polarized image of M87* and how we could use that to get some novel information about the structure of the magnetic field as well as the accretion flow around M87*. Dr. Emami will end with some of the next questions that scientists would like to address in the Event Horizon Telescope and the next generation of the Event Horizon Telescope (the NGEHT). Razieh Emami is a postdoc at the Center for Astrophysics. She has worked on a variety of different topics, including early universe cosmology, massive neutrinos, gravitational waves, TDES, galaxy evolution and BH physics. As a member of the Event Horizon Telescope (EHT) and its next generation (ngeht), she is currently focused on various topics relevant to the EHT, including black hole imaging, spectral analysis, model fitting and image reconstruction.
Razieh Emami - Supermassive Black Holes at the Center of M87 and Milky Way: What We Learn June 2022
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_h1EZHgf3KRM
The Mars 2020 mission was created to build off of the discoveries of its predecessors. The previous 4 rovers had found the building blocks for life on Mars. The Mars 2020 perseverance rover is the most advanced rover of the set, with each upgrade carefully designed to fit as much of the heritage Curiosity design as possible. Envisioned in 2012, launched in 2020, and landing on February 18, 2021 in the midst of a global pandemic, Perseverance made history as the 5th rover to land on Mars. Its express mission is to seek the signs of past life. Perseverance is the first leg of an ambitious program of Mars Sample Return. The samples collected by Perseverance could one day tell us whether there was past life on Mars. This talk will detail the scientific roadmap of the previous Mars rover missions, detail the evolution of landing technology, the augmentation of Perseverance to include Terrain Relative Navigation, and finally describe Perseverance’s journey from launch to landing. Dr. Swati Mohan joined NASA Jet Propulsion Laboratory first in 2004, after completing her B.S from Cornell University in Mechanical & Aerospace Engineering. After working as a systems engineer on Cassini during Saturn Orbit Insertion and Huygens Probe release, she returned to graduate school in 2005 to MIT. Dr. Mohan received her M.S. and Ph.D. in Aeronautics/Astronautics from the MIT Space Systems Laboratory. Since her return to JPL in 2010, Dr. Mohan has worked on multiple missions such as GRAIL and OCO-3. For the past 8 Years, she has been the Lead Guidance, Navigation and Controls Systems Engineer for Mars 2020 Perseverance rover, focusing on Cruise and EDL. In 2020, she transitioned to Mars 2020 Guidance, Navigation, and Controls Operations lead and mission commentator for the landing of the Perseverance rover on February 18, 202. She is currently the supervisor of the Guidance, Navigation, and Controls Systems Engineering group at NASA Jet Propulsion Laboratory and is working on the Mars Sample Retrieval Lander. Swati also co-founded and manages the Small Satellite Dynamics Test bed.
Mars 2020 From Launch to Landing NOVAC May 15, 2022
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_2hExA366YNk
In this presentation, Eric Snow shares his experience on improving the performance of equatorial mounts, a critical and expensive component of astrophotography systems. He starts with the basics of operation and covers the common sources of tracking errors found in lower- to moderately-priced systems. He presents a strategy to minimize these errors by using “hypertuning” and optimized guiding. The result is a “How-To” guide for achieving atmospheric-seeing-limited imaging performance with less expensive mounts.
Improving the Performance of Your Imaging Mount - NOVAC March 2022 Meeting
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_-J_Et2Rt50Y
How are there many different types of volcanoes in our Solar System? How do these volcanoes form and evolve? We’ll explore the marvelous volcanic wonders of the Solar System by deep diving into how they behave and form from different planetary materials, including the mysteries of cryovolcanism! Caitlin Ahrens’ research involves remote sensing of icy surfaces and volatile interactions, including permanently shadowed craters at the lunar poles and cryovolcanism. Dr. Ahrens also works on several planetary geomorphology projects, including lava flow morphology, caldera formation, and rheology, on Mars, Ceres, Titan, and Pluto. Dr. Ahrens received her B.S. in Physics/Astrophysics and Geology from West Virginia University in 2015, and a Ph.D. in Space and Planetary Science at the University of Arkansas in 2020. Dr. Ahrens is currently a NASA Postdoctoral Program Fellow at the Goddard Space Flight Center, and a member of the Diviner Science Team with the Lunar Reconnaissance Orbiter. In 2018, she was awarded the Ten Outstanding Young Americans award by the Jaycees for her efforts in science communication and outreach.
Caitlin Ahrens Ph.D. Wild & Wonderful Space Volcanoes!
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_o9h11jOi_MA
George Stallings takes us through the process for 3-D printing topological maps of the moon.
3-D Printing Topo Maps of the Moon
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_1AOjw6cAulU
Hello fellow astro-3D-printers! In our next meeting I'll be talking about the project for a (almost) fully 3D-printed barn door astro-tracker that Chris Papageorgakis (also a NOVAC member) and I have been working on. I'll start explaining briefly how a barn door tracker works, the simple math behind it and how it can be run using an Arduino and a stepper motor. Then I'll describe our specific design (which is inspired by the two versions found at the links below), show you our project and discuss the printing settings we used. Finally, I'll show you the final, printed barn door tracker and some test shots we took with it at a 200mm focal length. I'll also mention some troubles we ran into and tips to build it, in case anyone wants to try and reproduce it (I'd be happy to share the files!). Please feel free to contact me if you have any specific topic you'd like me to spend more time on. Links to the original models we used to come up with our design: 1) https://fstop138.berrange.com/2014/01/building-an-barn-door-mount-part-1-arduino-stepper-motor-control/ 2) https://atlantisq.wordpress.com/portfolio/obj-2601-barn-door-tracker-astra-v2-1/
NOVAC 3 D Printers Output by Stefano Antonini 2022 01 11 at 16 04 GMT 8
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_KOSGdDiIYag
Binoculars are NOT just for beginners, as this talk will stress. After various binocular-related terms are defined, Phil Harrington will offer consumer tips to help the audience weed out astronomically worthy binoculars from a vast ocean of models currently available. A lifelong amateur astronomer, Phil Harrington was bitten by the “astronomical bug” when he was assigned to watch the total lunar eclipse of April 1968 as a homework assignment. Since then, Phil has spent countless hours touring the universe through telescopes and binoculars. He is a former staff member of New York City’s Hayden Planetarium and instructor at the Vanderbilt Planetarium in Centerport, New York. Phil is an adjunct professor at Suffolk County Community College, Selden, New York, where he teaches courses in stellar and planetary astronomy. He is a founding member of the Westport (CT) Astronomical Society and is also one of the coordinators of the annual Astronomer’s Conjunction, held every summer in Northfield, MA. Phil is also a contributing editor for Astronomy magazine, where he has published more than 200 articles since 1988.
Phil Harrington at NOVAC January 2022 Meeting
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_bMDhdPZZ1q8
Amateur astronomers know too well that using a $400 Tele Vue eyepiece with a $100 telescope would be a waste of money and the capabilities of the Tele Vue. It would work, but for $500 a much better optical train could be assembled. Similarly, any attempt to get 300x out of a 60mm f//10 telescope using a 4mm eyepiece and a 2x Barlow would be disappointing. A 25 lb. telescope on a flimsy mount might not collapse the mount, but it would not make for good viewing. These examples illustrate that in astronomy as elsewhere, for optimum performance and return on investment, it is necessary to use carefully matched equipment. In this talk Dr. Fowler will explain the issues involved in matching optical equipment, astronomy cameras, and mechanical gear to determine optimal performance and the limits to any given astrophotography configuration. Thomas B. Fowler has been involved in astronomy since 1960. He is the author of over one hundred articles, many reviews for Cloudy Nights, and three books, including a book on astronomy equipment and techniques, “The View Through Your Telescope and How to Make it Better” (2020). He has given presentations to the Northern Virginia Astronomy Club and the TriState Astronomers. He is an independent consultant on technology to the U.S. government and Adjunct Professor of Engineering at George Mason University. He has lectured widely on science, technology, and philosophy. His doctorate from George Washington University is in system theory. He also owns 3 telescopes and too much other astronomy equipment to think about! His books can be ordered from Amazon.
Optimize your Astrophotography - NOVAC, 12/12/2021
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_vCtxCE4IzdY
What is faster than a speeding bullet? What can fly through turbulence without fastening its seat belt? What can tell us about the origin of our solar system at same time performing its main mission to understand our closest star? NASA’s Parker Solar Probe! The Parker Solar Probe (PSP) spacecraft was designed to aid in solving 3 mysteries of the Sun as well as the very practical goal of furthering the understanding of space weather. Space weather ranges from billions of tons of material hurled at Earth as Coronal Mass Ejections (CMEs) and solar flares that accelerate energetic particles that could damage electrical power grids on the Earth as well as harm astronauts in space. Parker has made measurements of a stealth or Streamer Blow Out Coronal Mass Ejections (SBO-CMEs) which create space weather. Learning to recognize and characterize these early CMEs help to understand their evolution through the solar system. In addition to studies of the Sun and solar wind, the mission has been able to study Venus, dust, and even capture photos of a comet! Come learn about the coolest hottest mission to the Sun! Astrophysicist Kelly Korreck knows how to handle the heat. She builds and operates instruments to study the Sun and understand its hot explosive outer atmosphere or corona. Her career has taken her from the desert of New Mexico to Japan, to the innermost part of the solar system. Kelly headed up science operations and project management for the SWEAP Suite aboard Parker Solar Probe. She works with engineers and scientists to create the best data from this once-in-a-lifetime mission. Kelly holds a Bachelor of Science degree in Physics and Astronomy and a Ph.D. in Space Physics both from the University of Michigan. When not studying the sun, she can be found near the beach, running, dancing, or in the yoga studio.
Come Fly Away to the Sun - NOVAC Meeting November 2021
YouTube Video UC62qYZDyzE1yKXjBxR-lguw_IW92FHqe-7U
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