Hosted at the AO, the colloquium series invites the most prominent figures in Space and Atmospheric Sciences, Radio Astronomy and Planetary Sciences to present and discuss the latest in their fields. All colloquia will be streamed live. Following the presentations there will be a section of questions and answers so that we can have an open discussion with the community of AO scientists, users and friends. Navigate the colloquia content and join us to participate in the discussion of some of the most thrilling science topics nowadays.
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- Sean Marshall [firstname.lastname@example.org]
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April 20, 2021 ON THE STRENGTH OF METEORITES: IMPLICATIONS FOR NEO HAZARD MITIGATION
Dr. Desiree Cotto
University of Puerto Rico at Humacao
Tuesday, Apr 20, 2021 2:00PM (AST)
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Date Name Affiliation Title Abstract 18 May 2021 Dr. Leonid Gurvits Joint Institute for VLBI ERIC and Delft University of Technology The Netherlands THE ESA's JUPITER ICY MOONS EXPLORER (JUICE) AND ITS VLBI-BASED SUPPORT ↳ View Bio, Abstract & Recordings
BioDr. Leonid Gurvits
Affiliation: Joint Institute for VLBI ERIC and Delft University of Technology The Netherlands
About the Speaker.
LG obtained MSc in Astronomy at the Moscow State University and MSc in Aerospace engineering from at Moscow Aviation Institute, both in 1979. He got PhD Tutorial in Radio Astronomy at the Space Research Institute in Moscow in 1983, and PhD in Astrophysics at the Lebedev Physical Institute (Moscow) in 1991. From 1979 through 1990 – researcher at the Space Research Institute of the USSR Academy of Sciences in Moscow. From 1979 he was involved in the Space VLBI project RadioAstron, from 1989 through 2003 – its Project scientist. From 1990 through 1991 – Head of Laboratory of Extragalactic Radio Astronomy of the Astro Space Center of the Lebedev Physical Institute. In 1992‐1994 – research associate at the National Astronomy and Ionosphere Center, Arecibo Observatory, Cornell University (USA). From 1994 to present time – at the Joint Institute for VLBI in Europe, Dwingeloo, The Netherlands, currently – Head of Space Science and Innovative Applications. Since 2011 – Professor at the Department of Astrodynamics and Space Missions of the Delft University of Technology, The Netherlands. Member (Academician) of the International Academy of Astronautics (since 2015). Main interests: extragalactic radio astrophysics, VLBI technology, space and planetary science.
THE ESA's JUPITER ICY MOONS EXPLORER (JUICE) AND ITS VLBI-BASED SUPPORT
19 May 2021
JUICE - JUpiter ICy moons Explorer - is the first Large Class mission in the ESA's Cosmic Vision programme. JUICE is due to launch in the middle of 2022. It will arrive at the Jovian system in the beginning of the next decade. It will spend at least three years characterizing the Jovian system, the planet itself, its giant magnetosphere, and the giant icy moons Ganymede, Callisto and Europa. JUICE will then orbit Ganymede for a few months. The first goal of JUICE is to explore the habitable zone around Jupiter. Ganymede is a high-priority target because it provides a unique laboratory for analyzing the nature, evolution and habitability of icy worlds, including the characteristics of subsurface oceans. On Europa, the focus will be on recently active zones. Callisto will be explored as a witness of the early Solar System. JUICE will also investigate the Jupiter system as an archetype of gas giants. The circulation, meteorology, chemistry and structure of the Jovian atmosphere will be studied from the cloud tops to the thermosphere and ionosphere. The JUICE science suite consists of 10 onboard instruments plus a ground-based experiment, PRIDE, which stands for Planetary Radio Interferometry and Doppler Experiment. The latter exploits the signal recording and processing technology developed originally for Very Long Baseline interferometric (VLBI). The essence of PRIDE is in observing the spacecraft radio signal with a network of Earth-based radio telescopes. The PRIDE technique developed at the Joint Institute for VLBI ERIC (JIVE) together with its partners was used for several experiments with several ESA planetary science missions. PRIDE is a multidisciplinary component of the JUICE science suite. The main measured deliverables of PRIDE are lateral coordinates and radial velocity of spacecraft. Its prime deliverable will be used primarily for improvement of the Jovian system ephemerides in support to a variety of applications, ranging from gravimetry to geodynamics to fundamental physics. The technique proved to be useful in many planetary science applications demonstrated on several missions over the past decade. Examples of these applications will be presented.
Date Name Affiliation Title Abstract 20 Apr 2021 Dr. Desiree Cotto-Figueroa University of Puerto Rico at Humacao ON THE STRENGTH OF METEORITES: IMPLICATIONS FOR NEO HAZARD MITIGATION ↳ View Bio, Abstract & Recordings
BioDr. Desiree Cotto-Figueroa
Affiliation: University of Puerto Rico at Humacao
About the Speaker.
Dr. Cotto-Figueroa is an Associate Professor of the Department of Physics and Electronics at the University of Puerto Rico at Humacao and the Coordinator of the UPR Humacao Astronomical Observatory. She holds a Ph.D. degree in Physics from Ohio University and worked as an Associate Postdoctoral Researcher at the School of Earth and Space Exploration at Arizona State University. Her research focuses on the study of Near-Earth Asteroids including the characterization of their rotation rate distribution, the study of radiation recoil effects on their dynamical evolution, and the study of their fragmentation. Asteroid (11456) Cotto-Figueroa has been named in her honor."
ON THE STRENGTH OF METEORITES: IMPLICATIONS FOR NEO HAZARD MITIGATION
20 Apr 2021
The near-Earth objects (NEOs) represent a global hazard to human civilization. As a result of the possible devastating consequences of NEO impacts, Congress tasked NASA with finding 90% of all asteroids >140 meters. Although it is of vital importance to detect these objects, it is also necessary to characterize them and understand their fragmentation processes, which depend upon scale. What connects these scales of asteroid strength, from centimeters to tens of meters or more, is the well-known Weibull theory that small samples of a rock are stronger than the whole. This leads to a statistical understanding of size-dependent strength that has been implemented in fragmentation and damage models. Our laboratory program undertakes repeated destructive measurements of representative meteorites typical of common asteroids in near Earth orbit. We have shown that the derived Weibull distribution projected to meter scales, overlaps the strengths determined from asteroidal airbursts and can be used to predict properties up to the 100-m scale. Understanding how mechanical properties scale with size will allow better predictions for the outcome of NEO airbursts, and rocks that spacecraft will encounter on asteroid surfaces, and ultimately to the deflection and disruption of NEOs.
Dr. Desiree Cotto talks about her upcoming colloquium at AO!…
28 Jan 2021 DR. P. K. MANOHARAN Arecibo Observatory, University of Central Florida SOLAR WIND STUDIES WITH THE ARECIBO TELESCOPE ↳ View Bio, Abstract & Recordings
BioDr. P. K. Manoharan
Affiliation: Arecibo Observatory, University of Central Florida
About the Speaker.
Manoharan developed a unique method to determine the speed and other physical properties of the solar wind using interplanetary scintillation (IPS) measurements from a single radio telescope. He performs space weather studies with the Arecibo Telescope. His research interests include multi–wavelength studies of eruptive solar events, physical properties of solar wind, space weather events, turbulence, pulsars, radio astronomy techniques, etc.
SOLAR WIND STUDIES WITH ARECIBO TELESCOPE
17 Dec 2020
I will review the significance of the interplanetary scintillation (IPS) observations made with the Arecibo Telescope in the frequency range of ~300 to 3000 MHz. These observations have been made with the telescope time available during the current COVID-19 pandemic period and are extremely useful to characterize the properties of the quiet solar wind (i.e., at the minimum phase between solar cycles 24 and 25) and some weak solar wind transient events (e.g., coronal mass ejections and interacting streams) at sun-earth distances between ~10 and 200 solar radii. Present results emphasis the importance of IPS measurements with a highly sensitive Arecibo-like radio telescope in understanding: (i) properties of the solar wind in its acceleration region, (ii) evolution of solar wind in association with the source region on the Sun, and (iii) physical properties of earth-directed space weather events. Moreover, IPS studies suggest that the MHD simulation of propagation of coronal mass ejection (CME) along with the IPS data in the inner heliosphere can be useful to accurately predict the time of arrival of the CME at the near-Earth space.
Teaser interview w/ Dr. P.K. Manoharan
Jan 28, 2021: Recorded session w/ Dr. P.K. Manoharan