Friday 1st December 2023 Space debris

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Hazards, Situational awareness and responsible use of space

Dr Philippe Blondel

Friday 1st December 2023 7.30 pm in the BRLSI, can be attended either in the BRLSI or remotely on Zoom

Lecture 4 of 4 on the theme ‘Conserving the Planet’ in association with the Herschel Museum of Astronomy

Image shows the distribution of space debris in orbit © ESA

Near-Earth space is littered with hundreds of millions of man-made objects rushing at very high speeds and risking collisions with each other and with every space platform. The new constellations of thousands of satellites will be at risk; they also increase the risks, through chain collisions, accidental deorbiting and other accidents. In 2021, the G7 Summit committed to “safe and sustainable use of space”. The UN Space2030 agenda recommended “enhanced information exchange on space objects”. But how do we detect objects mostly smaller than a centimetre, fast enough and far enough? This talk will present the current situation, from space collisions to intentional creation of space debris, the approaching Kessler Syndrome and the geopolitical context, in Earth and beyond. Drawing on the speaker’s direct experience, we will then look at technological solutions and policy implications.

Philippe Blondel is a remote sensing expert. Born and educated in France, his PhD was about the radar imaging of the planet Venus. He then worked in the US and the UK, mapping the oceans and designing new instruments. He enjoys seeing the applications of his research, from new commercial products to international standards, from de-risking marine renewable energies to addressing the effects of climate change on Arctic environments. Philippe edited “Solar System Update” (Springer, 2006) and he teaches planetary physics at the University of Bath. He co-authored the White Paper on “In-Space Utilisation of Asteroids” (2017) and experimented and published on imaging space debris and small targets (2018, 2019). His Knowledge Transfer activities include working with industry and participating to the UK Parliament Office of Science and Technology on “Defence of space-based assets.

A video recording of the lecture is freely available here.

Thursday 16th November 2023 Dying Stars Seeding the Universe

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The Caroline Herschel Prize Lecture 2023

7.00 pm Thursday 16th November 2023 at the 10E 0.17 Lecture Theatre, University of Bath and online via Zoom

Dr Marie van der Sande
University of Leiden

Dr Marie Van de Sande discusses why a multidisciplinary approach is necessary in understanding how stars like our sun die.

Astrochemistry is a vibrant and interdisciplinary field that brings together astronomy, physics, and chemistry. While there is an enormous effort in understanding the chemistry of stellar birth and youth, the chemistry of stellar death is as important: the death throes of sun-like stars enrich the galaxy with fresh material to form the next generation of stars and planets by losing their outer layers by means of a gentle outflow. The presence of a companion star or planet is thought to produce intricate structures within the outflow, giving rise to the beautiful shapes of planetary nebulae, the later stage in the star’s life and an important part of Caroline Herschel’s surveys. This opens up the question of the fate of our own Solar System. To understand exactly how stars like our Sun die and how they are recycled into the next generation of stars and planets, a multidisciplinary approach is necessary, with astrochemistry playing a leading role.”

Background of Speaker

Dr Marie Van de Sande is an Oort Fellow at Leiden Observatory at Leiden University, the Netherlands. She studies the chemistry around dying sun-like stars by developing novel chemical models and comparing their results to observations. Marie obtained her PhD in 2018 from KU Leuven (Belgium), where she stayed on as a fellow of the Research Foundation – Flanders (FWO). She moved to the University of Leeds as a Marie Skłodowska-Curie Individual Fellow in 2021 and relocated to Leiden in September this year.”

The video recording of the lecture is freely available here.

The Caroline Herschel Prize Lectureship was established in 2018 by what is now the Herschel Society, in association with the Royal Astronomical Society, to celebrate Caroline’s memory by supporting promising women astronomers early in their careers. Caroline, William’s younger sister, started out as his assistant, but in time became recognised as an important astronomer in her own right, was the first to be paid as such, and was awarded the RAS Gold Medal in 1828. The Caroline Herschel Prize Lecture is hosted by University of Bath in November in cooperation with the Society as part of the University’s public lecture series. Charles Draper, Chairman, Herschel Society.

Friday 3rd November 2023 A cluttered and noisy sky?

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Meeting the challenge of satellite constellations (and why you should care)

Dr Robert Massey

Friday 3rd November 2023 7.30 pm in the BRLSI, can be attended either in the BRLSI or remotely on Zoom

Lecture 3 of 4 on the theme ‘Conserving the Planet’ in association with the Herschel Museum of Astronomy

Image shows Signal pollution in a 333-second exposure image taken from the Blanco four-meter (13′) telescope at the Cerro Tololo Inter-American Observatory © NSF’s National Optical-Infrared Astronomy Research Laboratory/CTIO/AURA/DELVE.

65 years ago the Soviet Union placed the first satellite in space. There are now around 5,000 satellites in low-Earth orbit (LEO), the region up to 2,000 km above the ground, and their deployment is accelerating. 2019 saw the launch of Starlink, a satellite constellation built and launched by SpaceX, a system that on its own could soon have more than 30,000 spacecraft deployed. With other operators we could see up to 400,000 satellites in LEO by the end of this decade.

This is nothing less than a step change in our use of space. And like most paradigm shifts, it will have significant consequences. A key example is how it will affect the science of astronomy and our view of the sky. Some estimates suggest that the majority of ‘stars’ visible to the eye could be satellites, and professional and amateur astronomers alike now face significant challenges to our work. As a result our community has mobilised, working at a national, international and global level to tackle a complex problem, and to try to find a balance between the positive results of boosting communications and the impact on the space environment.

Robert Massey will set out the problem, what it means for scientists and the wider public, and what we can do about it.”

Dr Robert Massey is Deputy Executive Director of the Royal Astronomical Society. Before joining the RAS, his career took him from an undergraduate degree in Leicester and PhD research in Manchester to teaching in Brighton, and local politics in London alongside a stint as Public Astronomer at the Royal Observatory Greenwich. In his spare time he enjoys running, cycling, hiking and cooking, and generally making the most of life in his new family home in Sussex. With a lifelong private and public passion for astronomy, he very much wants to avoid a world where satellites ruin our shared heritage of an unsullied night sky.

A link to a video recording of this lecture is available here.