Rubens Machado
@rgmachado.bsky.social
astrônomo, professor na UTFPR Curitiba
http://paginapessoal.utfpr.edu.br/rubensmachado
http://paginapessoal.utfpr.edu.br/rubensmachado
Reposted by Rubens Machado
Later today, I'll do an introductory lecture on planet motion in the solar system. Here is an animation I prepared for that. It shows, to scale, the orbits and motion of Earth and Mars. The yellow line is the direction in which we here on Earth observe Mars. And as you can see in the video, 1/ 🧪🔭🎢
October 28, 2025 at 11:17 PM
Later today, I'll do an introductory lecture on planet motion in the solar system. Here is an animation I prepared for that. It shows, to scale, the orbits and motion of Earth and Mars. The yellow line is the direction in which we here on Earth observe Mars. And as you can see in the video, 1/ 🧪🔭🎢
Reposted by Rubens Machado
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
September 1, 2025 at 8:59 AM
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
Reposted by Rubens Machado
in hindsight we probably should have seen this was a trap, but everything was so new and we were still just kids
June 17, 2025 at 1:42 PM
in hindsight we probably should have seen this was a trap, but everything was so new and we were still just kids
Reposted by Rubens Machado
New: I recreated Tomas Wright’s 1742 astronomical treatise, Clavis Cælestis, and its accompanying sheets titled A Synopsis of the Universe. New posters are available in antique style and modern colors.
Explore: www.c82.net/clavis-caele...
How it was made: www.c82.net/blog/?id=99
Explore: www.c82.net/clavis-caele...
How it was made: www.c82.net/blog/?id=99
May 24, 2025 at 7:01 PM
New: I recreated Tomas Wright’s 1742 astronomical treatise, Clavis Cælestis, and its accompanying sheets titled A Synopsis of the Universe. New posters are available in antique style and modern colors.
Explore: www.c82.net/clavis-caele...
How it was made: www.c82.net/blog/?id=99
Explore: www.c82.net/clavis-caele...
How it was made: www.c82.net/blog/?id=99
The expansion of the Universe depends on its content. Here's an illustration of possible fates, according to the combinations of how much total matter and dark energy there is. Our Universe is the red dot with Omega_m=0.3 and Omega_Lambda=0.7, meaning flat geometry and eternal accelerated expansion.
February 19, 2025 at 8:51 PM
The expansion of the Universe depends on its content. Here's an illustration of possible fates, according to the combinations of how much total matter and dark energy there is. Our Universe is the red dot with Omega_m=0.3 and Omega_Lambda=0.7, meaning flat geometry and eternal accelerated expansion.
Reposted by Rubens Machado
Almost certainly being paranoid, but astronomers: someone outside the US has ADS backed up, right?
February 6, 2025 at 10:13 AM
Almost certainly being paranoid, but astronomers: someone outside the US has ADS backed up, right?
Reposted by Rubens Machado
#PhysicsFactlet
If you put apertures of different shapes in the path of a plane wave, you get different diffraction patterns. And with a bit of experience you can say a lot about the aperture shape just by looking at the diffraction pattern.
#Physics #Optics #Photonics #ITeachPhysics
If you put apertures of different shapes in the path of a plane wave, you get different diffraction patterns. And with a bit of experience you can say a lot about the aperture shape just by looking at the diffraction pattern.
#Physics #Optics #Photonics #ITeachPhysics
September 16, 2024 at 11:03 AM
#PhysicsFactlet
If you put apertures of different shapes in the path of a plane wave, you get different diffraction patterns. And with a bit of experience you can say a lot about the aperture shape just by looking at the diffraction pattern.
#Physics #Optics #Photonics #ITeachPhysics
If you put apertures of different shapes in the path of a plane wave, you get different diffraction patterns. And with a bit of experience you can say a lot about the aperture shape just by looking at the diffraction pattern.
#Physics #Optics #Photonics #ITeachPhysics
Reposted by Rubens Machado
The skies above Paranal are at risk from a proposed industrial megaproject.
This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.
Read more: https://www.eso.org/public/news/eso2501/
🔭
📷 ESO/P. Horálek
This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.
Read more: https://www.eso.org/public/news/eso2501/
🔭
📷 ESO/P. Horálek
World's darkest and clearest skies at risk from industrial megaproject
On December 24th, AES Andes, a subsidiary of the US power company AES Corporation, submitted a project for a massive industrial complex for environmental impact assessment. This complex threatens the pristine skies above ESO’s Paranal Observatory in Chile’s Atacama Desert, the darkest and clearest of any astronomical observatory in the world [1]. The industrial megaproject is planned to be located just 5 to 11 kilometres from telescopes at Paranal, which would cause irreparable damage to astronomical observations, in particular due to light pollution emitted throughout the project’s operational life. Relocating the complex would save one of Earth's last truly pristine dark skies.
www.eso.org
January 10, 2025 at 8:00 AM
The skies above Paranal are at risk from a proposed industrial megaproject.
This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.
Read more: https://www.eso.org/public/news/eso2501/
🔭
📷 ESO/P. Horálek
This would be located in the vicinity of ESO's Observatory. If constructed, it would irreparably impact astronomical observations.
Read more: https://www.eso.org/public/news/eso2501/
🔭
📷 ESO/P. Horálek
Reposted by Rubens Machado
For the 4th year in a row, my all-sky camera has been taking an image of the sky above the Netherlands every 15 seconds. Combining these images reveal the length of the night changing throughout the year, the passage of clouds and the motion of the Moon and the Sun through the sky. #astrophotography
January 4, 2025 at 1:27 PM
For the 4th year in a row, my all-sky camera has been taking an image of the sky above the Netherlands every 15 seconds. Combining these images reveal the length of the night changing throughout the year, the passage of clouds and the motion of the Moon and the Sun through the sky. #astrophotography
Reposted by Rubens Machado
Reposted by Rubens Machado
Another awesome JWST/MIRI data processing of dancing galaxy pair NGC 2207 + IC 2163, this time by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
www.flickr.com/photos/19746...
🔭 🧪
August 3, 2024 at 12:49 PM
Another awesome JWST/MIRI data processing of dancing galaxy pair NGC 2207 + IC 2163, this time by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
www.flickr.com/photos/19746...
🔭 🧪
Em 2004, o Gmail tinha um armazenamento revolucionário e dizia especificamente: "never delete another email". Nós acreditamos, mas infelizmente era mentira. Fomos otários de cair na cilada dessa empresa.
October 22, 2024 at 1:40 PM
Em 2004, o Gmail tinha um armazenamento revolucionário e dizia especificamente: "never delete another email". Nós acreditamos, mas infelizmente era mentira. Fomos otários de cair na cilada dessa empresa.
Aliás, acho que nosso calendário acadêmico é bem melhor. Começa no começo do ano e termina no fim. Primeiro tem o primeiro semestre e depois tem o segundo semestre, nessa ordem. Férias no meio do ano. Só tem vantagens.
Even living in the northern hemisphere for almost a decade now, I still have no clue what people mean by “this fall/this spring” and even less when they talk about “quarters”.
For the last one, I had to make a table and keep it in my notes because it already caused me so many issues.
For the last one, I had to make a table and keep it in my notes because it already caused me so many issues.
October 20, 2024 at 1:57 PM
Aliás, acho que nosso calendário acadêmico é bem melhor. Começa no começo do ano e termina no fim. Primeiro tem o primeiro semestre e depois tem o segundo semestre, nessa ordem. Férias no meio do ano. Só tem vantagens.
Reposted by Rubens Machado
Galaxy NGC 1566, viewed in mid-infrared as taken by JWST's MIRI.
Processed by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
Processed by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
October 6, 2024 at 6:21 PM
Galaxy NGC 1566, viewed in mid-infrared as taken by JWST's MIRI.
Processed by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
Processed by @thocarp.bsky.social
www.flickr.com/photos/19746...
🔭 🧪
Reposted by Rubens Machado
Here is a little video going back and forth between the two images, and what they tell us about how gas is distributed within that galaxy. (Hint: In the spiral arms, but not the central "bulge".) 2/
October 5, 2024 at 7:32 PM
Here is a little video going back and forth between the two images, and what they tell us about how gas is distributed within that galaxy. (Hint: In the spiral arms, but not the central "bulge".) 2/
My name is Machado and I approve this message
October 1, 2024 at 12:47 PM
My name is Machado and I approve this message
Reposted by Rubens Machado
Diretoria da SAB com Marina Freitas, homenageada durante a abertura da reunião anual por seu longo trabalho na secretaria da sociedade.
September 27, 2024 at 3:03 AM
Diretoria da SAB com Marina Freitas, homenageada durante a abertura da reunião anual por seu longo trabalho na secretaria da sociedade.
Reposted by Rubens Machado
Relatório de atividades FAPESP mostra que as demandas da comunidade científica recuperaram fôlego em 2023 bit.ly/4ggLIX8
#fomento #investimento #bolsas
#fomento #investimento #bolsas
September 10, 2024 at 11:10 PM
Relatório de atividades FAPESP mostra que as demandas da comunidade científica recuperaram fôlego em 2023 bit.ly/4ggLIX8
#fomento #investimento #bolsas
#fomento #investimento #bolsas
Como era o site da Sociedade Astronômica Brasileira @sabastronomia.bsky.social em 1997
web.archive.org/web/19970724...
you may not like it, but this is what peak webdesign looks like
web.archive.org/web/19970724...
you may not like it, but this is what peak webdesign looks like
Welcome to Brazilian Astronomical Society (SAB)
web.archive.org
September 4, 2024 at 1:42 PM
Como era o site da Sociedade Astronômica Brasileira @sabastronomia.bsky.social em 1997
web.archive.org/web/19970724...
you may not like it, but this is what peak webdesign looks like
web.archive.org/web/19970724...
you may not like it, but this is what peak webdesign looks like
No Currículo Lattes, tem como configurar a visibilidade de certas informações. Em particular, dá para deixar público o email, indo em:
Dados gerais > Endereço > Eletrônico > e-mail para contato > [Privado/Público]
buscatextual.cnpq.br/buscatextual...
Dados gerais > Endereço > Eletrônico > e-mail para contato > [Privado/Público]
buscatextual.cnpq.br/buscatextual...
September 4, 2024 at 11:33 AM
No Currículo Lattes, tem como configurar a visibilidade de certas informações. Em particular, dá para deixar público o email, indo em:
Dados gerais > Endereço > Eletrônico > e-mail para contato > [Privado/Público]
buscatextual.cnpq.br/buscatextual...
Dados gerais > Endereço > Eletrônico > e-mail para contato > [Privado/Público]
buscatextual.cnpq.br/buscatextual...
Reposted by Rubens Machado
From @lcgordon.bsky.social: Today’s authors spin up simulations that could explain the unique radio structure in NGC 6166. 🔭✨️
astrobites.org/2024/09/03/n...
astrobites.org/2024/09/03/n...
You (Might) Spin Me Right Round (The Cluster Center)
Today’s authors spin up simulations that could explain the unique radio structure in NGC 6166.
astrobites.org
September 3, 2024 at 3:00 PM
From @lcgordon.bsky.social: Today’s authors spin up simulations that could explain the unique radio structure in NGC 6166. 🔭✨️
astrobites.org/2024/09/03/n...
astrobites.org/2024/09/03/n...
Reposted by Rubens Machado
One thing I love about arxiv.org is that, even though you know that their backend has improved massively over the years, their frontend and UI has not changed : it's simple, works with little bandwidth, and *you know exactly where everything is*. None of this constant redesign shit we get elsewhere.
arXiv.org e-Print archiveopen searchopen navigation menucontact arXivsubscribe to arXiv mailings
arxiv.org
September 3, 2024 at 9:46 AM
One thing I love about arxiv.org is that, even though you know that their backend has improved massively over the years, their frontend and UI has not changed : it's simple, works with little bandwidth, and *you know exactly where everything is*. None of this constant redesign shit we get elsewhere.
Introdução à Astronomia
Curso de Extensão na UTFPR Curitiba
Palestras abertas ao público
inscrições: tinyurl.com/astroUTFPR
Curso de Extensão na UTFPR Curitiba
Palestras abertas ao público
inscrições: tinyurl.com/astroUTFPR
September 3, 2024 at 6:20 PM
Introdução à Astronomia
Curso de Extensão na UTFPR Curitiba
Palestras abertas ao público
inscrições: tinyurl.com/astroUTFPR
Curso de Extensão na UTFPR Curitiba
Palestras abertas ao público
inscrições: tinyurl.com/astroUTFPR
Esse vídeo é muito útil pra explicar a diferença entre dia solar e dia sideral
commons.wikimedia.org/wiki/File:Si...
commons.wikimedia.org/wiki/File:Si...
September 2, 2024 at 8:38 PM
Esse vídeo é muito útil pra explicar a diferença entre dia solar e dia sideral
commons.wikimedia.org/wiki/File:Si...
commons.wikimedia.org/wiki/File:Si...