#astrometric — Public Fediverse posts

Astronomers have confirmed the existence of #exoplanet Gaia-4b—one of the most massive #planets known to orbit a low-mass #star.

Gaia-4b is also the first #planet detected by the #Gaia spacecraft using the #astrometric technique.

The newly discovered exoplanet, named Gaia-4b, has an orbital period of 570 days and a mass of 12 Jupiter masses and orbits a star 64% of the mass of the sun.

#astronomy
https://phys.org/news/2025-02-high-precision-spectrograph-massive-exoplanet.html

Astronomers have confirmed the existence of #exoplanet Gaia-4b—one of the most massive #planets known to orbit a low-mass #star.

Gaia-4b is also the first #planet detected by the #Gaia spacecraft using the #astrometric technique.

The newly discovered exoplanet, named Gaia-4b, has an orbital period of 570 days and a mass of 12 Jupiter masses and orbits a star 64% of the mass of the sun.

#astronomy
https://phys.org/news/2025-02-high-precision-spectrograph-massive-exoplanet.html

Predicting #astrometric #microlensing events from #Gaia Data Release 3: https://academic.oup.com/mnras/article/527/1/1177/7379784?login=false -> Gaia is so Accurate it Can Predict Microlensing Events: https://www.universetoday.com/164088/gaia-is-so-accurate-it-can-predict-microlensing-events/

Predicting #astrometric #microlensing events from #Gaia Data Release 3: https://academic.oup.com/mnras/article/527/1/1177/7379784?login=false -> Gaia is so Accurate it Can Predict Microlensing Events: https://www.universetoday.com/164088/gaia-is-so-accurate-it-can-predict-microlensing-events/

Timeline of #SpaceExploration

• 📆 1610 discovery 🔭 of the Galilean #moons 🪐 (of #Jupiter) 🇮🇹
• 📆 1944 First man-made object in #space 🇩🇪
• 📆 1949 First #mammal in #space 🇺🇸
• 📆 1959 First #spacecraft to reach the #Moon 🇷🇺
• 📆 1989 First #astrometric #satellite 🇪🇺
• 📆 2001 First #laser #satellite link 🇫🇷 🇪🇺
• 📆 2010 First #sample return from an #asteroid 🇯🇵
• 📆 2015 First #propulsive landing of an #orbital #rocket 🚀
• 📆 2022 First #asteroid ☄️ deflected by a #spacecraft 🇺🇸

https://en.wikipedia.org/wiki/Timeline_of_space_exploration

Picture : #Oumuamua 2017 https://commons.wikimedia.org/wiki/File:Comet_20171025-16_gif.gif

Timeline of #SpaceExploration

• 📆 1610 discovery 🔭 of the Galilean #moons 🪐 (of #Jupiter) 🇮🇹
• 📆 1944 First man-made object in #space 🇩🇪
• 📆 1949 First #mammal in #space 🇺🇸
• 📆 1959 First #spacecraft to reach the #Moon 🇷🇺
• 📆 1989 First #astrometric #satellite 🇪🇺
• 📆 2001 First #laser #satellite link 🇫🇷 🇪🇺
• 📆 2010 First #sample return from an #asteroid 🇯🇵
• 📆 2015 First #propulsive landing of an #orbital #rocket 🚀
• 📆 2022 First #asteroid ☄️ deflected by a #spacecraft 🇺🇸

https://en.wikipedia.org/wiki/Timeline_of_space_exploration

Picture : #Oumuamua 2017 https://commons.wikimedia.org/wiki/File:Comet_20171025-16_gif.gif

Direct Imaging and #Astrometric Discovery of a #Superjovian Planet Orbiting an Accelerating Star: https://arxiv.org/abs/2212.00034 -> over a year of reviewing and revising - but "no changes in conclusions" - before formal publication -> Wobbling star found in Gaia-Hipparcos data confirmed to host #exoplanet: https://www.esa.int/Science_Exploration/Space_Science/Gaia/Wobbling_star_found_in_Gaia-Hipparcos_data_confirmed_to_host_exoplanet

Direct Imaging and #Astrometric Discovery of a #Superjovian Planet Orbiting an Accelerating Star: https://arxiv.org/abs/2212.00034 -> over a year of reviewing and revising - but "no changes in conclusions" - before formal publication -> Wobbling star found in Gaia-Hipparcos data confirmed to host #exoplanet: https://www.esa.int/Science_Exploration/Space_Science/Gaia/Wobbling_star_found_in_Gaia-Hipparcos_data_confirmed_to_host_exoplanet

First semi-empirical test of the #whitedwarf mass-radius relationship using a single white dwarf via #astrometric #microlensing: https://arxiv.org/abs/2206.01814 -> Astronomers using NASA's #Hubble Space Telescope have for the first time directly measured the #mass of a single, isolated white dwarf: https://hubblesite.org/contents/news-releases/2023/news-2023-004

First semi-empirical test of the #whitedwarf mass-radius relationship using a single white dwarf via #astrometric #microlensing: https://arxiv.org/abs/2206.01814 -> Astronomers using NASA's #Hubble Space Telescope have for the first time directly measured the #mass of a single, isolated white dwarf: https://hubblesite.org/contents/news-releases/2023/news-2023-004