Posts on Ansi

Detect arms of our own galaxy

Wed, 28 Dec 2022 00:00:00 +0000

Introduction

Radio astronomy is a branch of astronomy that studies celestial objects and phenomena using radio frequency radiation. One of the key techniques in radio astronomy is the use of neutral hydrogen to detect the structure of our own galaxy, the Milky Way.

Neutral hydrogen is the most abundant element in the universe and is made up of a single proton and a single electron. It is present in virtually all galaxies and is often used to trace the structure of these galaxies. In the Milky Way, neutral hydrogen is found in the interstellar medium, the space between the stars, as well as in the disks and arms of the galaxy.

ClearOutside Mastodon Bot

Tue, 27 Dec 2022 00:00:00 +0000

Introduction

Mastodon is a decentralized social networking platform that allows users to create and join communities, or “instances,” where they can share text, images, and other media. One way to enhance the user experience on Mastodon is by writing a bot, which is a program that performs automated tasks on the platform.

To get started, you will need to have a basic understanding of programming and be familiar with Mastodon’s API (Application Programming Interface). The API is a set of rules that govern how software applications can interact with Mastodon’s servers, allowing developers to build their own tools and integrations.

Exoplanet hunt WASP 33b

Wed, 14 Dec 2022 00:00:00 +0000

WASP 33b

More information:

Astronomy Links

Thu, 01 Dec 2022 00:00:00 +0000

Introduction

Hey everyone, I’m passionate about astronomy and have been compiling a list of fantastic websites to delve deeper into this captivating field. Whether you’re a seasoned space explorer or just starting your cosmic journey, this list has something for you!

Feel free to browse the links, expand your knowledge, and be amazed by the wonders of the universe. If you stumble upon any other cool astronomy resources, please ping me – I’d love to add them to the list and keep learning together!

Galaxies and Nebulars

Sat, 03 Sep 2022 00:00:00 +0000

Nebulars

Galaxies

Commets

Clusers

Forward to the moon

Mon, 29 Aug 2022 00:00:00 +0000

Forward to the moon

On the occasion of the first start attempt of Artemis 1, I took the liberty and gave a little presentation in our local maker space. The original idea was to catch people with this presentation and get them interested in the space topic. Originally the timing was aligned with the start, so they had some background and could enjoy the launch. As we all know the start was delayed. But nevertheless here is the presentation. Please keep in mind it was ment for everyday audience to get them interested not for already space nerds.

SDRplay remote on raspberry

Sat, 20 Aug 2022 00:00:00 +0000

SDRPlay

I recently bought myself a SDRPlay receiver to play with this technology and maybe build a ground station or meteor scatter detector. The original plan is to setup a receiver on the Motionlab roof with an raspberry pi and send the IQ data via network down to a local server and extract the interesting information. One great software to work remotely with an SDR receiver is the Soapy project.

Install the raspberry pi part

Build system

Install the latest raspberry pi lite version from raspberrypi.org

TOI4465

Tue, 09 Aug 2022 00:00:00 +0000

Exoplanet discovery

Back in early August, I had the pleasure to join a team of global amateur astronomers to conduct a 3-day search for the illusive transit of the planet candidate TOI 4465.01. This gas giant planet candidate is part of the NASA-sponsored long-duration transit-hunting research program at Unistellar. It was discovered with only a single transit, so we had to monitor a 3-day window to try to catch another transit.

Hat-P023b

Mon, 08 Aug 2022 00:00:00 +0000

Exoplanet

More information:

Ra Shalom

Sun, 07 Aug 2022 00:00:00 +0000

Near-Earth object Ra Shalom

I participated in the August 2022 Campaign to observe Ra-Shalom. There should have been a video here but your browser does not seem to support it. There should have been a video here but your browser does not seem to support it.

The campaign is now over and here is one summary:

Generate Load with Docker to test K8s

Sat, 23 Jul 2022 00:00:00 +0000

The Idea

Every now and then you want to test your installation, your server or your setup. Specially when you want to test auto scaling functionalities. Kubernetes has an out of the box auto scaler and the official descriptions recommends a test docker container for testing with a apache and php installation. This is really great for testing a web application where you have some workload for a relatively short time frame. But I would also like to test a scenario where the workload runs for a longer time in the kubernetes setup and generates way more cpu workload then a web application. Therefore I hacked a nice docker container based on a c program load generator.

Weather in your calendar with weather underground

Fri, 15 Jul 2022 00:00:00 +0000

Calendar

I really like to plan the day in my calendar. Therefore I added a lot of external ical feeds like meetup, open-air cinema and for sure lauchlibrary.

In order to decide on transportation I always have the weather underground page in a separate browser tab. This is very inconvenient, therefore I wrote a small script to get weather predictions via API call from wunderground and export an ical feed and update my google calendar with weather conditions.

Host your own Docker HUB

Sun, 03 Jul 2022 00:00:00 +0000

How to build an controlled environment to distribute docker images based on user accounts

Docker itself, AWS (just to name the biggest docker hosts right now) and many more public / private repository servers are on the marked. But sometime there is need to host an own registry for docker images. One reason can be because we can, the other is for example to give individual pull / push rights to different images to different users and control the access also based on expiration dates.

Planetary defender

Fri, 24 Jun 2022 00:00:00 +0000

Near-Earth object (25916) 2001 CP44

Thanks to UniStellar and their eVScope starting today I can call myself now a planetary defender.

I participated in the spot the near-earth asteroid campaign.

25916 (2001CP44) is estimated to be 5.68 kilometres in diameter. For reference, an impact from a one km asteroid could be enough to destroy a continent; the Chicxulub impact that wiped out the dinosaurs 66 million years ago were caused by an asteroid 10 km wide.

My first hunt of an Exoplanet

Thu, 23 Jun 2022 00:00:00 +0000

Exoplanet discovery

Not a long time ago we were all speculating about planets orbiting around other suns than ours, so-called exoplanets. Actually there was a nobel prize for physics in 2019 for discovering the very first exoplanet.

Michael Mayor and Didier Queloz discovered the planet with the Radial_velocity method which is impressive.

Since then we discovered > 5000 exoplanets.

Fixing the caching_sha2 problem with wordpress and mysql verion 8

Wed, 15 Jun 2022 00:00:00 +0000

The problem

I am using wordpress with mysql both in a docker installation. The procedure for my setup is described here. Since mysql updated to version 8 they introduced caching_sha2 as the default password algorithm. When you use the auto update mechanism in wordpress everything is fine and wordpress still works with the native password version configured for the wordpress user. But if you use wordpress in a docker container and pull wordpress:latest there is a problem since wordpress 4.9.7 to access the mysql database: (Never thought I can use the word wordpress so many times in a sentence!)

New Homepage

Wed, 01 Jun 2022 00:00:00 +0000

Introduction

Starting the (I think fifth) try to build a homepage. Not sure if I convert old stuff or just start from scratch. But this is the first post and more or less a test for hugo. I also plan to setup static information on 23-5.eu.