- Instrumentation - mailing lists STRW

[instrumentation meeting] Presentation Audrey Oort room (BM4.33) @ 11:00
by Michiel Darcis 30 Apr '25

30 Apr '25

Hi all, This week Audrey will give a presentation on the progress of her project where she is designing a setup to put light from the outside into the METIS instrument inside the Kamerlingh Onnes lab. In the remaining time we will go over the usual slides so do send them to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] Oort room (BM 4.33) @11:00
by Michiel Darcis 23 Apr '25

23 Apr '25

Hi all, We are back in the Oort room! You know what to do with your slides :) Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] CE.0.06 @11:00 (Different room!)
by Michiel Darcis 16 Apr '25

16 Apr '25

Hi all, They hijacked our Oort room and moved us to CE.0.06 for this week. What stays constant is to send your slides to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] Presentation bachelor project (Oort room BM 4.33 @ 11:00)
by Michiel Darcis 09 Apr '25

09 Apr '25

Hi all, Today we have a presentation from Bowen and Ethan on the progress of their Bachelor project on creating mineral moon maps for Cubesat missions. Their project is the following: The main goal is making a mineral moon map using visual data and a relatively simple setup as a preparation for a CubeSat mission. To achieve this goal two main methods of obtaining data are used. One method focusses on combining a spectrograph with an RGB camera setup. The other is using a hyperspectrograph. The aim of the project is to compare the methods, testing there feasibility and gain an idea of what to expect from the results of the CubeSat mission. Besides that, taken data can also be used to further train existing AI programs used for classifying the minerals found within this data, as well as expanding the knowledge within in visual range which is lacking compared to the well observed infrared range. After the presentation we will continue with the usual slides so send them to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] Oort room (BM 4.33) @ 11:00
by Michiel Darcis 02 Apr '25

02 Apr '25

Hi all, While some of us are having a great time in Chile, the rest of us are going to have a great instrumentation meeting. Send your two slides to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] Oort room (BM 4.33) @ 11:00
by Michiel Darcis 26 Mar '25

26 Mar '25

Hi all, Today we go back to having a regular instrumentation meeting. Send your two slides to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] Dr. Long presentation (Oort room BM 4.33 @ 11:00)
by Michiel Darcis 19 Mar '25

19 Mar '25

Hi all, Today we have our guest Dr. Long giving a talk during our meeting. You can find a reminder on the content below. This will take ~30 minutes and afterwards we will continue with the usual slide roulette. So still send your two slides to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Looking forward to seeing you there. Cheers, Michiel Title: More data than you want, fewer data than you need: machine learning approaches to starlight subtraction with MagAO-X Abstract: High-contrast imaging relies on post-processing to remove residual starlight from the host star to reveal planets and disks. Most observers do this with principal components analysis (i.e. KLIP) using modes computed from the science images themselves. These modes may not be orthogonal to planet and disk signals, leading to over-subtraction. The wavefront sensor data recorded during the observation provide an independent signal with which to predict the instrument point-spread function. MagAO-X is an extreme adaptive optics system for the 6.5-meter Magellan Clay telescope. MagAO-X is designed to save all sensor information, including millions of kHz-speed wavefront measurements per observation. My approach combines a GPU-accelerated physical optical model and a machine learning model within the same automatic differentiation framework (specifically JAX by Google) to "learn" a mapping from wavefront sensor frames to the inputs of a physical optics model. This preserves the interpretability of the model while also enforcing physical constraints. I will present progress so far in constructing and training such a model, as well as some future directions I plan to explore. Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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Visiting guest this week
by haffert＠strw.leidenuniv.nl 17 Mar '25

17 Mar '25

Hi all, This week Dr. Joseph Long will be visiting Leiden Observatory to work with us on the development of new High-Contrast Imaging post-processing techniques. I am planning to take him out to dinner on Tuesday evening (tomorrow). Please let me know if you want to join us by the end of today. Then I can reserve a table with enough places. Also, Dr. Long will also give a talk at the instrumentation group meeting this week. Title and abstract are below. Title: More data than you want, fewer data than you need: machine learning approaches to starlight subtraction with MagAO-X Abstract: High-contrast imaging relies on post-processing to remove residual starlight from the host star to reveal planets and disks. Most observers do this with principal components analysis (i.e. KLIP) using modes computed from the science images themselves. These modes may not be orthogonal to planet and disk signals, leading to over-subtraction. The wavefront sensor data recorded during the observation provide an independent signal with which to predict the instrument point-spread function. MagAO-X is an extreme adaptive optics system for the 6.5-meter Magellan Clay telescope. MagAO-X is designed to save all sensor information, including millions of kHz-speed wavefront measurements per observation. My approach combines a GPU-accelerated physical optical model and a machine learning model within the same automatic differentiation framework (specifically JAX by Google) to "learn" a mapping from wavefront sensor frames to the inputs of a physical optics model. This preserves the interpretability of the model while also enforcing physical constraints. I will present progress so far in constructing and training such a model, as well as some future directions I plan to explore. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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[instrumentation meeting] Oort room (BM 4.33) @ 11:00
by Michiel Darcis 12 Mar '25

12 Mar '25

Hi all, This week another instalment of the instrumentation meeting in the Oort room (BM 4.33) @ 11:00. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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Group meeting Oort room (BM 4.33) at 11:00.
by haffert＠strw.leidenuniv.nl 05 Mar '25

05 Mar '25

Hi all, Don’t forget the most important event of the week. Group meeting today at 11:00! Send slides to me and Michiel. We also have a visitor today, Jalo Nousiainen, who will join us during the meeting. Zoom link for the remote folks: Sebastiaan Haffert is inviting you to a scheduled Zoom meeting. https://universiteitleiden.zoom.us/j/7267353069?pwd=JQ4pnKb14HkPby0v9XJqmcg… Meeting ID: 726 735 3069 Passcode: s$Rw5KhA Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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2026

2025

Instrumentation