Archive for Mastodon

Weekly Update from the Open Journal of Astrophysics – 18/10/2025

Posted in OJAp Papers, Open Access, The Universe and Stuff with tags , , , , , , , , , , , , , , , , , , , , on October 18, 2025 by telescoper

It’s time once again for the usual Saturday update of the week’s new papers at the Open Journal of Astrophysics. Since the last update we have published four  more papers, which brings the number in Volume 8 (2025) up to 156, and the total so far published by OJAp up to 391.

I’d like to encourage people to follow our feed on the Fediverse via Mastodon (where I announce papers as they are published, including the all-important DOI) so this week I’ll include links to each announcement there.

The first paper to report is “Shot noise in clustering power spectra” by Nicolas Tessore (University College London, UK) and Alex Hall (University of Edinburgh, UK). This was published in the folder Cosmology and NonGalactic Astrophysics on Tuesday October 14th 2025. This presents a discussion of the effects of ‘shot noise’, an additive contribution due to degenerate pairs of points, in angular galaxy clustering power spectra. Here is a screen grab of the overlay:

You can find the officially accepted version of the paper here. The Mastodon announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Shot noise in clustering power spectra" by Nicolas Tessore (University College London, UK) and Alex Hall (University of Edinburgh, UK)

doi.org/10.33232/001c.145919

October 14, 2025, 7:07 am 2 boosts 0 favorites

Next one up is “The Giant Arc – Filament or Figment?” by Till Sawala and Meri Teeriaho (University of Helsinki, Finland). This paper discusses the abundance of large arc-like structures formed in the standard cosmological model, with reference to the “Giant Arc” identified in MgII absorption systems. It was published on Wednesday October 15th in the folder Cosmology and NonGalactic Astrophysics. The overlay is here:

The officially accepted version of this paper can be found on the arXiv here and the Mastodon announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "The Giant Arc – Filament or Figment?" by Till Sawala and Meri Teeriaho (University of Helsinki, Finland)

doi.org/10.33232/001c.145931

October 15, 2025, 6:33 am 2 boosts 3 favorites

 

The third paper this week,  published on Monday 6th October, is “Detecting wide binaries using machine learning algorithms” by Amoy Ashesh, Harsimran Kaur and Sandeep Aashish (Indian Institute of Technology, Patna, India). This was published on Friday 17th October (yesterday) in the folder Astrophysics of Galaxies. It presents a method for detecting wide binary systems in Gaia data using machine learning algorithms.

The overlay is here:

 

You can find the officially accepted version of this paper on arXiv here. The announcement on Mastodon is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Detecting wide binaries using machine learning algorithms" by Amoy Ashesh, Harsimran Kaur and Sandeep Aashish (Indian Institute of Technology, Patna, India)

doi.org/10.33232/001c.146027

October 17, 2025, 6:55 am 0 boosts 0 favorites

The last one this week is “Learned harmonic mean estimation of the Bayesian evidence with normalizing flows” by Alicja Polanska & Matthew A. Price (University College London, UK), Davide Piras (Université de Genève, CH), Alessio Spurio Mancini (Royal Holloway, London, UK) and Jason D. McEwen (University College London). This one was also published on Friday 17th October, but in the folder Instrumentation and Methods for Astrophysics; it presents a new method for estimating Bayesian evidence for use in model comparison, illustrated with a cosmological example.

The corresponding overlay is here:

 

You can find the officially accepted version on arXiv here. The Mastodon announcement is here:

Open Journal of Astrophysics

New Publication at the Open Journal of Astrophysics: "Learned harmonic mean estimation of the Bayesian evidence with normalizing flows" by Alicja Polanska & Matthew A. Price (University College London, UK), Davide Piras (Université de Genève, CH), Alessio Spurio Mancini (Royal Holloway, London, UK) and Jason D. McEwen (University College London)

doi.org/10.33232/001c.146026

October 17, 2025, 7:06 am 0 boosts 0 favorites

That concludes the papers for this week. With two weeks to go I think we might reach the 400 total by the end of October.

Beginning Astronomy

Posted in Biographical with tags , on October 14, 2025 by telescoper

I have a two-hour lecture coming up after which I have immediately to dash to the airport in order to embark on a trip to a foreign country, so in lieu of a proper post here is a nice cartoon I saw on Mastodon.

Natasha Jay 🇪🇺

School Parents Night vs Astronomy Conference

By Tom Gauld in “Physics for Cats”

The first panel shows a parent-teacher conference ("School Parents' Night") where a teacher is giving a girl's parents a failing F grade for their daughter. The second panel shows an "Astronomy Conference" where the same girl, now an adult, is being awarded a medal for her work.
October 12, 2025, 4:31 pm 548 boosts 772 favorites

This also allowed me to check whether the embed facility works, which it seems to do. This actually gives me an idea about how to speed up my weekend updates, which I might try out on Saturday.

Social Media Better than Meta

Posted in Biographical with tags , , , , , , on November 16, 2024 by telescoper

You may or may not know that these blog posts appear automatically on various social media platforms.

I have been posting content automatically on Meta platforms, Facebook and Threads. Recently, however, Meta’s AI algorithm has been randomly blocking posts. A couple of weeks ago it blocked this post (about the Edgeworth family) on the grounds that it violated rules concerning “sexually explicit content”. Today it blocked this post (the weekly update for OJAp) on the grounds that it was identified as spam. I can see the need for an automatic screening given the huge volume of posts, but the problem is that my facebook feed is full of actual spam that gets through these filters while innocent posts get blocked. In other words the algorithm is crap. If you ask for a review of the decision, all Meta does is run the algorithm again – with the same results, which is a waste of time.

I haven’t got time to waste on such stupidity so I will shortly be deactivating automatic posts to Facebook and Threads; these generate very little traffic for me anyway.

There are, however, plenty of alternative ways of following this blog. You can subscribe by email or by RSS feed for a start. On other social media platforms I recommend the federated version on Mastodon here:

https://telescoper.blog/@telescoper.blog

They also appear on my personal Mastodon account here:

https://mastodon.social/@telescoper

Posts also appear on LinkedIn here:

https://www.linkedin.com/in/peter-coles-911912216/

and on my BlueSky account:

https://bsky.app/profile/telescoper.bsky.social

WordPress has just set up an automatic integration with BlueSky, on which I now have over 3000 followers, which is nice, but any one of these is better than Meta!

In the Dark on Social Media

Posted in Biographical, Politics with tags , , , , , , on August 12, 2024 by telescoper

It’s almost a year since I deactivated my Twitter account. Or should I call it X? Anyway, it doesn’t matter because I don’t use it any more. Over the past few weeks it seems quite a few more – especially in the UK – have had enough of the antics of Elon Musk (aka Space Karen), especially with his attempts to fan the flames of the recent Farage riots by spreading misinformation. The first thing I noticed was that my BlueSky account was suddenly getting quite a lot of new followers. I now have about 850, still a long way short of the over 7000 I used to have on Twitter, but the level of engagement is far higher. That’s because the algorithm Space Karen introduced on X makes it difficult for your own followers. let alone anyone else, to see your tweets. The one disadvantage of BlueSky is that it doesn’t have an API that allows me to post directly from this blog when I publish a post, so I have to copy the URL by hand.

I also have an account on Mastodon where I have over 1200 followers and similarly good engagement. When I first started there a couple of years ago it didn’t have a WordPress API but it does now, so everything I write here gets posted automatically on my feed. Not only that, this blog is now also now fully federated which means that there is an autonomous feed for the blog posts. Not just a link to each post, as the API produces, but the whole post. This is a nice feature because if I change a post on this WordPress platform it automatically gets changed on the Mastodon feed.

I also have a Facebook Page on which these

And now there’s Threads, which is like a version of Twitter bolted onto Instagram. When this first came out last year it wasn’t available in the EU for data protection issues so I didn’t bother with it. I only just found out at the weekend that has been available since December 2023 but I wasn’t paying much attention to social media then so didn’t catch the news. Anyway, since I already have a (very quiet) Instagram account so I set up a Threads account which you can find here if you like that sort of thing. My first impressions of Threads are not very favourable, but let’s see how it goes. At least it’s not as bad as Twitter. I still think it is indefensible that my employer, along with most other universities, has decided to maintain a presence on that site.

Cold Turkey Twitter

Posted in Biographical with tags , , , , on October 8, 2023 by telescoper
Image: The New European

I’ve seen quite a few articles (such as this one on LinkedIn) by academics lamenting the terminal decline of the website formerly known as Twitter, so I thought I’d add my thoughts. I come to bury Twitter, not to praise it.

I joined Twitter in 2009 or thereabouts. Over the years, I accumulated around 7300 followers. Not an enormous number by any standards, but a reasonable one. I used the platform only partly for academic matters. I found it in turns amusing and annoying. I dealt with the latter aspect largely through liberal use of the block facility. I admit I found the recreational aspect mildly addictive.

In recent times, however, Twitter (or X as we’re now supposed to call it) has turned to shit. Since Elon Musk took over, users are basically silenced unless they pay for a blue tick, the social media equivalent of buying a megaphone for use in a library. The API that allowed me to post there from WordPress was axed, which was an additional pain. Add the constant stream of promoted tweets and other ads to the deluge of unmoderated bigotry, and the result is unbearable.

I deleted my Twitter account completely at the end of August and haven’t looked back. Since I’d spent a lot of time there, a number of friends expressed scepticism that I’d manage to do it cold turkey like that, but it was no problem, and I have no withdrawal symptoms.

I now much prefer Mastodon, where I’ve had an account for about a year. I have just over a thousand followers there, just one seventh of the number I had on Twitter, but much higher levels of engagement. More importantly, it’s far more civilized. I’ve only had to block one person. WordPress has also introduced an autopost to Mastodon, so every blog post I write appears there automatically.

I have also joined BlueSky. This site is still in development and, for the time being, is by invitation only, so is rather quiet. In recent weeks, however, I’ve noticed quite a large number of astronomers arriving there, so it is an interesting place to be. I have some spare invites, actually…

Just say no to Twitter. It’s not worth it.

Social Media and Academia

Posted in Biographical with tags , , , , on July 11, 2023 by telescoper

I saw the post attached below and thought I’d share it here. I don’t have as many followers on social media as the author of the post and I’ve never thought of confining this blog to purely research topics. In terms of academic matters I never thought Twitter was useful for anything other than sharing web links. I’m glad that I stuck to the longer form of blogging represented by this site.

Nevertheless I do have similar experiences of Twitter to those described in the article. It has indeed turned to shit. Since Elon Musk took over, you are basically silenced unless you pay for a blue tick, the social media equivalent of buying a megaphone for use in a library. Add the constant stream of promoted tweets and other ads and it really is a bad experience all round. I locked my Twitter account some time ago.

While I still post on Twitter, I now much prefer Mastodon. I have about 1/8 the number followers there, but much higher levels of engagement and it’s far more civilized. WordPress has now introduced an autopost to Mastodon, incidentally. The autopost to Twitter is no longer supported. If anyone wants to follow me on social media I’d recommend finding me on Mastodon.

(I’ve also joined BlueSky, but so far that is rather slow. I won’t be joining Threads, as that isn’t available in the civilized world (i.e. the European Union) owing to data protection issues.)

The Week(s) Ahead

Posted in Biographical, Education, Irish Language with tags , , on November 6, 2022 by telescoper

So here we are then. The study break is over. Tomorrow we resume teaching. Six weeks of the semester gone. Another six to go. I didn’t do half the things I meant to do last week but at least I’m not behind with teaching things. I should be able to cover everything I need to cover in the second half without having to speed up too much. That’s the hope anyway.

Over the weekend I’ve been thinking a bit about my social media strategy, if you can call it that. It seems Elon Musk has realized that Twitter isn’t worth a fraction of what he paid for it, and is worth even less now that advertisers are fleeing, so has decided to recoup at least some of his losses by giving priority to anyone who wants to pay $8 a month so they can broadcast whatever they like withouyt moderation. The famous “blue tick” will no longer even mean a verified user, just someone willing to pay to shout at everyone else. Musk is also in the process of sacking about half his workforce.

I’m not going to pay anything to the Chief Twit and don’t like the way Twitter is going anyway so I’ve decided that I will indeed move to Mastodon, which I quite like, and where you can find me here. I don’t have a huge Twitter following so migrating to Mastodon is no big deal for me. I see many thousands I know on Twitter and many more I don’t are doing likewise.

Posts from this blog are automatically sent to Twitter and I won’t stop doing that, but I won’t be logging on there much except from time to time to block anyone I see who has a blue tick on their profile…

Anyway, in other news, the forthcoming week also sees me resume my feeble attempts to learn the Irish language, so it’s possible I may be boring you all with updates over the next few weeks and months. You have been warned.

On Mastodon…

Posted in Biographical with tags , , , on October 31, 2022 by telescoper

The recent takeover of Twitter by Elon Musk, and the likely removal of content moderation with all that implies for increased toxic behaviour, has led me to reconsider my use of social media. I know I’m not alone in this either. Over the weekend I noticed quite a few of my friends quitting Twitter for Mastodon so I thought I’d give it a go.

Mastodon is a microblogging service with a similar look and functionality to Twitter but there are some big differences. For a start Mastodon is not run from a single website. It is a distributed network of servers around the world running open-source software; each server is called an ‘instance’. This means that it is not owned by a single individual or company and the different instances can have different moderation policies. Any person or organization capable of operating a server running the software, and willing to take on the legal issues, can federate to the overall network.

For another thing it is community led, with each instance run by volunteers. It is free of charge, has no advertising , so none of those annoying ‘promoted tweets’, nor any creepy algorithms trying to influence your behaviour, and above all does not exist to serve the ego of a billionaire owner with sociopathic tendencies.

Then there is the moderation policy. I joined the original server `mastodon.social’ (where I am the usual @telescoper) which has the following rules:

Hopefully this will deter those who spend all their time on Twitter sending abuse from joining Mastodon. This server is based in Germany, hence number 5. Although I think it was included for other reasons, it reminds me that defamation is a criminal offence in Germany, punishable by a prison sentence. A certain individual who has a habit of posting defamatory messages about me on Twitter should bear this in mind…

Anyway, I’ve only just got onto the platform and am still finding my way around. I only have a handful of followers, compared to the 7000+ I have on Twitter. For the time being I’m still on Twitter, but if it goes well then I intend to leave that to the trolls and bigots. I’m sick of spending so much time blocking objectionable people and seeing decent people abused.

P.S. One thing I think would be handy would be an API that allows me to publish these blog posts automatically on Mastodon like I do on Twitter, but I haven’t seen one yet…