Changes between Version 481 and Version 482 of AstroTechTalk
- Timestamp:
- 15 Jul 2020, 10:40:41 (4 years ago)
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AstroTechTalk
v481 v482 51 51 || '''03.07.2020 (11hrs, Zoom)''' || '''Coryn Bailer-Jones''' || '''Video-Link: https://zoom.us/j/99009962194?pwd=cVU1NUpnL1c5MjNoZlZGTEgvNTB2QT09 [[BR]][[BR]]The Space Elevator'''[[BR]] [[BR]] Rockets are a rather ineffective way into space. In order to bring a satellite into an orbit around Earth, each ton of payload requires 50 to 100 rons of propellant (plus the rocket itself). One alternative would be a huge elevator reaching up into the orbit. In contrast to a building, which is exposed to pressure loads, due to its height such an elevator would be rather equivalent to a cable under tension. While such a construction is in principle possible, it requires materials which are currently available only in tiny amounts. Anyhow, such an elevator would allow for a much cheaper access into space. Coryn Bailer-Jones will describe the principles of such a construction, the practical challenges during its erection and how we could use it to bring spacecrafts into orbit.[[BR]][[BR]]Presentation: German[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2020S1/2020-07-03_Weltraumaufzug.pdf Slides: German][[BR]]Questions: German, English || 52 52 || 10.07.2020 || || || 53 || '''17.07.2020 (11hrs, Zoom)''' || '''Christian Fendt''' || ''' Astronomy for Non-Astronomers (Part 4)'''[[BR]][[BR]]This lecture series is intended as further eduction for colleagues at MPIA who are NOT working as astronomers. We want to raise interest for this interesting field of research, maybe even raise enthusiasm. [[BR]] [[BR]] Part 1 ([https://intranet.mpia.de/intranet/en/lecture-series recording of April 24th 2020]) and part 2 ([https://intranet.mpia.de/intranet/en/lecture-series recording of May 15th 2020]) provided an overview over the astronomical objects.[[BR]][[BR]]In this part of the lecture series (parts 3 and 4)we will discuss what light is, what properties it has, and how we could learn something about the properties of distant astronomical objects by observing them with telesopes and instruments.[[BR]] [[BR]] External guests are cordially invited as well.[[BR]][[BR]]Presentation: German[[BR]][https://intranet.mpia.de/intranet/en/lecture-series Slides/Recording: German] [[BR]]Questions: German, English ||53 || '''17.07.2020 (11hrs, Zoom)''' || '''Christian Fendt''' || '''Video-Link: https://zoom.us/j/91197644349?pwd=YXhGVTNCa21NTm1mZFhhODJtSkdYUT09 [[BR]][[BR]]Astronomy for Non-Astronomers (Part 4)'''[[BR]][[BR]]This lecture series is intended as further eduction for colleagues at MPIA who are NOT working as astronomers. We want to raise interest for this interesting field of research, maybe even raise enthusiasm. [[BR]] [[BR]] Parts 1 and 2 ([https://intranet.mpia.de/intranet/en/lecture-series recordings of April 24th and May 15th 2020]) provided an overview over the astronomical objects.[[BR]][[BR]]In this part of the lecture series, parts 3 ([https://intranet.mpia.de/intranet/en/lecture-series recording of June 19th 2020]) and 4, we will discuss what light is, what properties it has, and how we could learn something about the properties of distant astronomical objects by observing them with telesopes and instruments.[[BR]] [[BR]] External guests are cordially invited as well.[[BR]][[BR]]Presentation: German[[BR]][https://intranet.mpia.de/intranet/en/lecture-series Slides/Recording: German] [[BR]]Questions: German, English || 54 54 || '''24.07.2020[[BR]](11hrs, Zoom)''' || '''Fiona Kenny (NUI Galway)''' || '''Video-Link: https://zoom.us/j/98495679892?pwd=aFYvZEMxK0U5RElxMnpPRTQ1eDVjZz09 [[BR]][[BR]]Simulating beam propagation for LISA'''[[BR]][[BR]]Following from the success of LIGO and VIRGO, the Laser Interferometer Space Antenna (LISA) will be the first dedicated gravitational wave observatory in space. To be launched in 2034, it will comprise three identical spacecraft flying in equilateral triangle formation in an Earth-lagging orbit, and acting as a heterodyne interferometer with arm-lengths on the order of Mkm. Given that gravitational waves will cause picometer-level changes to the optical path length, accurate simulation of the propagation of light between the three LISA spacecraft will be a vital tool in determining the design of the telescopes in the constellation. In this talk Fiona Kenny will explain how LISA will work and her work developing a numerical software tool to carry out this task with the requisite accuracy and speed. Similar to ground based adaptive optics, she will describe the effects that an aberrated and jittering transmitting telescope have on the wavefront error and hence science limitations at the receiving telescope.[[BR]][[BR]]Presentation: English[[BR]][https://svn.mpia.de/trac/gulli/att/raw-attachment/wiki/AlteVortraege2020S1/2020-07-24_LISA.pdf Slides: English] [[BR]]Questions: German, English || 55 55
