Variable Stars can Tell us Where and When to Search for Extraterrestrials https://www.universetoday.com/162635/variable-stars-can-tell-us-where-and-when-to-search-for-extraterrestrials/ #searchforextraterrestrialintelligence #breakthroughlisten #gaiaobservatory #setiinstitute #astrometry #astronomy #featured #gaiadr3 #seti

Long article on the combined #exoplanet hunting method from the previous post in the thread: https://www.expressnews.com/business/article/hunting-planets-san-antonio-astrophysicist-uses-18090895.php - the first author "says combining #astrometry and direct imaging strategies should lead to the discovery of more exoplanets — and he’s already been reviewing data from #Gaia and Hipparcos to get a bead on more catalogued stars with orbiting companions."

@greggadams I suspected #Pixel7 was making a lot of these #stars up while losing many others in #computationalphotography #postprocessing cleanup, so I took the liberty of running your photo through an online #astrometry tool. Well, after giving it a decently thorough try of over 10 minutes, it failed to identify the part of the sky your photo shows https://nova.astrometry.net/status/6992627 I mean it's a nice looking photo, it just doesn't align particularly well with reality.

One thing that bugged me the most with it is that it made all the stars the same colour and there's a sudden cutoff at a certain apparent magnitude of stars in the clearest portion of the sky where there should be more fainter stars visible than behind the clouds, and yet it's exactly the opposite in your photo.

I'm attaching a quick test of a similar scene but using a "dumb" #Canon #R6 for comparison (just using a kit lens, wanted to see how well it'd do). Astrometry tool identified the #starfield in 50s https://nova.astrometry.net/status/6992748

I guess we'll have to invent new branch of #ethics with "computational photography" just as we're overdue having one for #AI generated contents like #ChatGPT, #DALLE or similar. :breadthink: #FoodForThought

Constraints for the orbital #inclination and the true mass of long-period single companions.

This work illustrates how #Gaia and #Hipparcos allow for the orbital properties and masses of long-period RV companions to be further constrained.

The first constraints for nearby long-period #planets from Gaia have started getting published.

#astronomy #exoplanets #radialvelocity #astrometry
https://arxiv.org/abs/2301.01263

Stellar and substellar companions from Gaia EDR3.

According to this new paper, #Gaia #astrometry sensitivity would be just enough to independently verify the existence of Proxima c.

Although the existence is in serious doubt, Gaia could help resolve the situation by providing a clear detection or by ruling out the existence of the planet.

#astronomy #exoplanets #Proximab

Paper by Kervella et al (2022): https://arxiv.org/abs/2109.10912

"HIP 99770 b is the first #exoplanet ever discovered jointly through direct imaging and #astrometry and the first discovery leveraging on μ-arcsecond precision #Gaia astrometry": https://arxiv.org/abs/2212.00034

A detection of a superjovian #exoplanet around the dusty A star HIP 99770 using precision #astrometry and direct imaging.

The #planet HIP 99770 b is in a low-eccentricity orbit 16.9 au from the primary, receiving about as much light as #Jupiter does from the Sun.

This discovery is a proof-of-concept for a fundamentally new strategy for finding imageable planets: selecting targets based on dynamical evidence from indirect methods like astrometry.

#astronomy #exoplanets https://arxiv.org/abs/2212.00034

Data from ESA’s Gaia mission reveals our Sun’s future and past https://www.nasaspaceflight.com/2022/08/gaia-reveals-sun-evolution/ #international #astrophysics #heliophysics #astrometry #astronomy #european #featured #galaxies #uncrewed #stars #gaia #esa #sun

The Closeby Habitable Exoplanet Survey (CHES) Could Detect Exoplanets Within a few Dozen Light-Years of Earth Using Astrometry https://www.universetoday.com/155926/the-closeby-habitable-exoplanet-survey-ches-could-detect-exoplanets-within-a-few-dozen-light-years-of-earth-using-astrometry/ #closebyhabitableexoplanetsurvey #chineseacademyofsciences #earth-likeexoplanets #exoplanetdetection #extrasolarplanets #astrometry #exoplanets #astronomy #featured #ches #ces