Hanno Rein
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hanno-rein.de
Hanno Rein
@hanno-rein.de
930 followers 370 following 200 posts
#Astrophysics Professor at the University of #Toronto, Minor Planet 12249, #UTSC, #UofT, developer of the Exoplanet App for #iOS, #pilot, #cycling, #climbing, #running, #Egyptology, #woodworking.
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Reposted by Hanno Rein
teddykareta.bsky.social
wasn't jealous of their 100-hour runtime until I saw what "The Naval Ordinance Research Calculator" actually looked like and now I am actually Very Jealous
the computer in question, taken from https://en.wikipedia.org/wiki/IBM_Naval_Ordnance_Research_Calculator
November 11, 2025 at 5:17 PM
hanno-rein.de
I redid the integration with REBOUND. And it now takes less than a second on my laptop. 😉
Source code: gist.github.com/hannorein/b1...
Modern plot of orbital parameters using REBOUND
November 11, 2025 at 5:03 PM
hanno-rein.de
Link to paper: arxiv.org/abs/2412.04583
A substellar flyby that shaped the orbits of the giant planets
The modestly eccentric and non-coplanar orbits of the giant planets pose a challenge to solar system formation theories which generally indicate that the giant planets emerged from the protoplanetary ...
arxiv.org
November 10, 2025 at 5:14 PM
hanno-rein.de
Michael Poon has been the lead on this! Michael constructs a hierarchical Bayesian model that combines all published exoplanet obliquity measurements. He finds that the observed distribution is very different from the obliquities in our own Solar System, hinting at a different formation scenario.
November 7, 2025 at 3:36 PM
Reposted by Hanno Rein
stephaniecarvin.bsky.social
Just noticed that the Budget calls for Canada to join Eurovision. Like we are never going to get the points, guys. Unless we join the Eastern European block.
Text reads: Protecting Our National Broadcaster: CBC/Radio-Canada CBC/Radio-Canada is part of our Canadian identity. Canada's new government is protecting our national broadcaster by ensuring it has the resources needed to modernise and better deliver for Canadians, and to continue providing vital programming in both French and English. • Budget 2025 proposes to provide $150 million in 2025-26 for CBC/Radio-Canada to strengthen its mandate to serve the public and to better reflect the needs of Canadians. The government will explore modernising CBC/Radio-Canada's mandate to strengthen independence, and is working with CBC/Radio Canada to explore participation in Eurovision.
November 5, 2025 at 1:21 PM
hanno-rein.de
Yes
November 4, 2025 at 2:54 PM
hanno-rein.de
Did it really need three different font sizes?
November 4, 2025 at 12:04 AM
hanno-rein.de
We also do a hands-on MCMC with 24 human walkers who walk up and down a corridor as determined by a dice and the Metropolis Hastings algorithm, and along the way sample from a discrete posterior distribution that I've attach to doors.
November 3, 2025 at 5:46 PM
hanno-rein.de
And now number 3!
Another kitten in a trap
November 1, 2025 at 11:09 PM
hanno-rein.de
Number 2!
Kitten in trap
November 1, 2025 at 10:16 PM
hanno-rein.de
The mom is extremely trap savvy. We’ve been literally trying for years.
October 31, 2025 at 11:58 PM
hanno-rein.de
October 31, 2025 at 11:53 PM
Reposted by Hanno Rein
sundogplanets.mastodon.social.ap.brid.gy
I wrote a paper https://ui.adsabs.harvard.edu/abs/2022AJ....163...21L/abstract a few years ago with Aaron Boley and @hannorein and our horrifying predictions for light pollution from satellites are matching up perfectly, Lemmon was low in the northwest for this video […]
Original post on mastodon.social
mastodon.social
October 31, 2025 at 7:00 PM
hanno-rein.de
This looks almost exactly like our simulations from 2022:

www.youtube.com/watch?v=3QkB...

If anyone wants to play with the simulations themselves, you can download our free iOS app "Mega Constellations" apps.apple.com/us/app/mega-.... Although by now you might also just step outside and look up 😢
Constellations
YouTube video by Hanno Rein
www.youtube.com
October 31, 2025 at 7:22 PM