Sylvestre Lacour
@slacour.bsky.social
Astronomer at Paris Observatory
Reposted by Sylvestre Lacour
Two papers announcing the discovery of a directly imaged 6 Jupiter mass planet around binary system HD 143811 AB Squicciarini+ and Jones+ in Sco-Cen - Keck, Gemini and VLT all imaging this companion and confirmed with several years of common proper motion. #astrodon #exoplanet #exosci
September 9, 2025 at 9:29 AM
Two papers announcing the discovery of a directly imaged 6 Jupiter mass planet around binary system HD 143811 AB Squicciarini+ and Jones+ in Sco-Cen - Keck, Gemini and VLT all imaging this companion and confirmed with several years of common proper motion. #astrodon #exoplanet #exosci
Reposted by Sylvestre Lacour
Proud supervisor moment: #LeidenObservatory graduate student Richelle van Capelleveen led one of two papers on our discovery of WISPIT 2b, a 5 Jupiter mass exoplanet clearing a path in a circumstellar disk. Laird Close and his team saw it in H-alpha, indicating gas accretion #astrodon 🔭 🧪
August 26, 2025 at 11:51 AM
Proud supervisor moment: #LeidenObservatory graduate student Richelle van Capelleveen led one of two papers on our discovery of WISPIT 2b, a 5 Jupiter mass exoplanet clearing a path in a circumstellar disk. Laird Close and his team saw it in H-alpha, indicating gas accretion #astrodon 🔭 🧪
Reposted by Sylvestre Lacour
Nouvelle actu au @liraastro.bsky.social : première détection d'ammoniac dans l'atmosphère d'un compagnon de masse planétaire, GJ504b, dont on ne sait pas vraiment si c'est une exoplanète ou une naine brune. Selon les estimations GJ504b pourrait avoir une masse de 1 ou 23 masses de Jupiter. 1/4
January 23, 2025 at 4:16 PM
Nouvelle actu au @liraastro.bsky.social : première détection d'ammoniac dans l'atmosphère d'un compagnon de masse planétaire, GJ504b, dont on ne sait pas vraiment si c'est une exoplanète ou une naine brune. Selon les estimations GJ504b pourrait avoir une masse de 1 ou 23 masses de Jupiter. 1/4
Reposted by Sylvestre Lacour
1/ ☄️ Comet C/2024 G3 (ATLAS) is gracing our skies, and we’d like to share some amazing images from ESO's Paranal Observatory in Chile!
This stunning shot by our friend Yuri Beletsky, with the comet next to an Auxiliary Telescope, is today's Astronomy Picture of the Day. Congrats, Yuri! 🔭 🧪
This stunning shot by our friend Yuri Beletsky, with the comet next to an Auxiliary Telescope, is today's Astronomy Picture of the Day. Congrats, Yuri! 🔭 🧪
January 24, 2025 at 1:22 PM
1/ ☄️ Comet C/2024 G3 (ATLAS) is gracing our skies, and we’d like to share some amazing images from ESO's Paranal Observatory in Chile!
This stunning shot by our friend Yuri Beletsky, with the comet next to an Auxiliary Telescope, is today's Astronomy Picture of the Day. Congrats, Yuri! 🔭 🧪
This stunning shot by our friend Yuri Beletsky, with the comet next to an Auxiliary Telescope, is today's Astronomy Picture of the Day. Congrats, Yuri! 🔭 🧪
Reposted by Sylvestre Lacour
So long and thanks for all the fish! I just observed my last star this morning... #GaiaDPAC and @esa.int Gaia teams will do their best to make some great data releases from the data I gathered! #GaiaDR4 in 2026, #GaiaDR5 around the end of the decade. Keep posted for our news today at 10:00 CET.
rotating european space agency GIF - Find & Share on GIPHY
Discover & share this rotating european space agency GIF with everyone you know. GIPHY is how you search, share, discover, and create GIFs.
giphy.com
January 15, 2025 at 8:12 AM
Reposted by Sylvestre Lacour
Il y a 20 ans aujourd'hui, la sonde Huygens de l'agence spatiale européenne se posait sur Titan, lune de Saturne avec un cycle du méthane : des rivières, des lacs des nuages...de méthane!
January 14, 2025 at 6:01 PM
Il y a 20 ans aujourd'hui, la sonde Huygens de l'agence spatiale européenne se posait sur Titan, lune de Saturne avec un cycle du méthane : des rivières, des lacs des nuages...de méthane!
Reposted by Sylvestre Lacour
The @esa.int Gaia satellite takes its final ever observations today 😭🔭
During its final few months of life, some technical tests will be performed, during which it will be much easier to see from Earth than usual. ESA published a guide on how to try and take photographs of the satellite:
During its final few months of life, some technical tests will be performed, during which it will be much easier to see from Earth than usual. ESA published a guide on how to try and take photographs of the satellite:
Observe Gaia from the ground - Gaia - Cosmos
www.cosmos.esa.int
January 15, 2025 at 10:46 AM
The @esa.int Gaia satellite takes its final ever observations today 😭🔭
During its final few months of life, some technical tests will be performed, during which it will be much easier to see from Earth than usual. ESA published a guide on how to try and take photographs of the satellite:
During its final few months of life, some technical tests will be performed, during which it will be much easier to see from Earth than usual. ESA published a guide on how to try and take photographs of the satellite:
Reposted by Sylvestre Lacour
@obs-paris-psl.bsky.social vous présente ses meilleurs vœux!
2025 marque un tournant important : une nouvelle organisation scientifique, une nouvelle identité graphique, de nouveaux sites internet.
Suivez-nous pour découvrir toutes les nouveautés qui façonnent notre avenir.
@psl-univ.bsky.social
2025 marque un tournant important : une nouvelle organisation scientifique, une nouvelle identité graphique, de nouveaux sites internet.
Suivez-nous pour découvrir toutes les nouveautés qui façonnent notre avenir.
@psl-univ.bsky.social
January 14, 2025 at 2:58 PM
@obs-paris-psl.bsky.social vous présente ses meilleurs vœux!
2025 marque un tournant important : une nouvelle organisation scientifique, une nouvelle identité graphique, de nouveaux sites internet.
Suivez-nous pour découvrir toutes les nouveautés qui façonnent notre avenir.
@psl-univ.bsky.social
2025 marque un tournant important : une nouvelle organisation scientifique, une nouvelle identité graphique, de nouveaux sites internet.
Suivez-nous pour découvrir toutes les nouveautés qui façonnent notre avenir.
@psl-univ.bsky.social
