The Legacy The era of all-sky space astrometry began with the Hipparcos mission in 1989 and provided the first very accurate catalogue of apparent magnitudes, positions, parallaxes and proper motions of 120 000 bright stars at the milliarcsec (or milliarcsec per year) accuracy level. Hipparcos has now been superseded by the results of the Gaia mission. The third Gaia data release contained astrome

https://www.astro.lu.se/GaiaNIR/Vision - 2025-06-17

A transcription of the sixth episode Nic:  This is the sixth and last episode of season one of the Meridian. We want to start by thanking everyone who has followed us on this journey into the world of podcasting and we hope to be back soon with the second season.  Today is the 29th of October, and as always, we're coming to you from Lund Observatory.  Crossing our local Meridian in this episode we

https://www.astro.lu.se/meridian-s01e06 - 2025-06-17

A seminar series for young astronomers at Lund Observatory. The Källén Seminars for Young Astronomers is a seminar series organised by and intended for the young researchers of Lund Observatory. The seminar series is financed by the Gunnar and Gunnel Källén’s Memorial Fund, the Faculty of Science and the Department of Astronomy and Theoretical Physics. The seminar series invites international spea

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers - 2025-06-17

The development of a new space astrometry mission will require a large team of scientist, software developers and spacecraft engineers. Many lessons can be learned from the Gaia mission where DPAC (the Data Processing and Analysis Consortium) was responsible for the processing of Gaia's data and producing the Gaia Catalogue. In a similar manner a new DPAC consortium will be formed. The first task

https://www.astro.lu.se/GaiaNIR/consortium - 2025-06-17

OverviewAn obvious technological improvement to the current Gaia mission is to also go into the non-thermal Near-InfraRed (NIR) with a wavelength cutoff in the K-band allowing the new mission to probe deeper through the Galactic dust to observe the structure and kinematics of the star-forming regions in the disc, the spiral arms and the bulge region, to give model independent distances and proper

https://www.astro.lu.se/GaiaNIR/mission-summary - 2025-06-17

There are three main science challenges for a new all-sky astrometry mission: 1. Peering through the dust: NIR astrometry (and simultaneous photometry) is crucial for penetrating obscured regions and for observing intrinsically red objects when implemented with sufficient accuracy. Peering through the dust of the Milky Way to obtain a dense sampling of the phase space is necessary to properly stud

https://www.astro.lu.se/GaiaNIR/ScienceCase - 2025-06-17

A transcription of the mid-winter special episode, or the zeroth episode of season two. Nic:  This is a special holiday episode of the Meridian. Your hosts for this episode are me and Rebecca and our producer Anna, of course.  We are coming to you on the 21st of September 2021.   Rebecca:  Which is happens to be the winter solstice.   Nic:  It's actually the summer solstice.   Rebecca:  Or the win

https://www.astro.lu.se/meridian-s02e00 - 2025-06-17

SpacecraftThe space telescope will be based on an off-axis f=35m Korsch telescope as used for Gaia.  Spacecraft design from the ESA CDF study Optical surfaces and the light path from the ESA CDF study This design differs from Gaia's in that:the mirror surfaces are simple conics to simplify manufacturing, alignment and test.the entrance pupil is at a flat folding mirror in front of the primary inst

https://www.astro.lu.se/missiondesign - 2025-06-17

 < This could be presented as a picture (which is not as accessible to all audiences) or as general text>The 2010sInitial proposal...The 2020sConcept development and proposal phase.The 2030sDetailed design phaseMission acceptance phaseThe 2040sLaunchNominal operationsData processing phase startsThe 2050sData processing phase continuesExtended operations phase 

https://www.astro.lu.se/timeline - 2025-06-17

Källén Seminar for Young Astronomers on March 1, 2022 The Density Gradient Inside Molecular-Gas Clumps as a Booster of their Star Formation Activity   ABSTRACT The presence of a gas volume-density gradient inside star-forming regions allows them to raise their star formation rate compared to what they would experience if their gas was of uniform density. This effect is quantified by the “magnifica

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/genevieve-parmentier - 2025-06-17

Källén Seminar for Young Astronomers on February 8, 2022 Seeing in 3D, modelling the structures of hot exoplanet atmospheres   ABSTRACT With the launch of JWST, astronomers are preparing to observe hot exoplanet atmospheres with unprecedented precision. With this comes valuable information of the 3D structures, temperatures, wind speeds and chemical compositions of these worlds. In addition to thi

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/elspeth-lee - 2025-06-17

Källén Seminar for Young Astronomers on February 22, 2022 High-resolution transit spectroscopy: challenges and recent progress ABSTRACT I will briefly introduce the concept of transit photometry and spectroscopy and explain complementarity of space- and ground-based observations. Then I will focus on challenges of achieving the required data quality and importance of high spectral resolution. Fina

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/nikolai-piskunov - 2025-06-17

Källén Seminar for Young Astronomers on March 22, 2022 Venusian evolutionary histories and connections to present day observables ABSTRACT Despite Venus & Earth having distinct atmospheres and surface temperatures, they have similar densities and sizes. They may also likely have similar bulk compositions, making comparison between them extremely valuable for illuminating their distinct climate his

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/michael-way - 2025-06-17

Källén Seminar for Young Astronomers on March 8, 2022 Probing the early Milky Way with the Pristine survey ABSTRACT The lowest metallicity stars that still exist today represent a window into the early Universe. Studying these stars gives us a local avenue to guide our understanding of star formation and supernova feedback in the early Universe, the early build-up of galaxies like our Milky Way, a

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/else-starkenburg - 2025-06-17

A transcription of the first episode of season two. This is the first episode of the second season of the Meridian and we're once again coming to you from Lund Observatory in southern Sweden. It is the 4th of March and we're starting the season with a very special guest crossing our Meridian today.  Ori Fox is an instrument scientist at the Space Telescope Science Institute working on the mid-infr

https://www.astro.lu.se/meridian-s02e01 - 2025-06-17

A transcription of the second episode of season two. Nic:  This is episode two of season two of the Meridian. It is March 11th, 2022 and we are once again coming to you from Lund Observatory, Lund University in southern Sweden.  Crossing our local Meridian today we have Diane Feuller who is a researcher here at Lund Observatory working on galactic archaeology using stellar abundances, ages and kin

https://www.astro.lu.se/meridian-s02e02 - 2025-06-17

Källén Seminar for Young Astronomers on April 5, 2022 Changing paradigms in planet formation theory ABSTRACT Questions about the origins of Earth have forever accompanied humans. The classical theory of planet formation, established when the Solar System was the only one we knew, has been recently challenged and is undergoing major changes. In this talk, I will explain how the growing population o

https://www.astro.lu.se/meetings/kallen-seminars-young-astronomers/previous-speakers/joanna-drazkowska - 2025-06-17

A transcription of the third episode of season two. Rebecca:  This is episode three of season 2, the Meridian, and we're once again coming to you from Lund Observatory, Lund University, here in southern Sweden.  It is March 18th when we release this episode and this episode will talk to Professor Nikolai Piskunov, who's visiting us from Uppsala University a bit up north.  Well, middle of Sweden, b

https://www.astro.lu.se/meridian-s02e03 - 2025-06-17

Presentations from SRS 2022 Links to the SRS 2022 talks are below. Wednesday 23rd 13:00: David Hobbs (LU) - Welcome to Lund Intro.pdf Astrobiology - Chair: Natuschka Lee 13:05: Merve Yesilbas (UmU) - The Role of Salts and Brines in Modern Martian Geochemistry 13:30: Birger Schmitz (LU) - Astronomy by looking down instead of up - research at the Astrogeobiology Laboratory Astronomy - Chair: Felix R

https://www.astro.lu.se/SRS2022/presentations-srs-2022 - 2025-06-17

A transcription of the fourth episode of season two. Nic: Welcome to episode four of season two of the Meridian. Once again we are recording at Lund Observatory in Sweden and we are releasing this episode on March 2nd. Crossing our local Meridian today we are lucky to have Dainis Dravins, a professor emeritus here who studies stellar surfaces. This season we are also bringing you some field report

https://www.astro.lu.se/meridian-s02e04 - 2025-06-17