Astrometry
Branch of astronomy involving positioning and movements of celestial bodies
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We include updates on Astrolabe, Parallax, United States Naval Observatory, Inertial frame of reference, Henrietta Swan Leavitt, Frame of reference, Ephemeris, Cepheid variable, Celestial mechanics, Cosmic distance ladder, Angular diameter, Stellar parallax, Rotating reference frame, Proxima Centauri c, Great conjunction, Proper motion ... and more.
| 2025 |
HR 8799 e
First direct detection of carbon dioxide in the planet's atmosphere was announced, marking a significant milestone in exoplanet atmospheric research.
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| 2025 |
51 Eridani b
Detection of water and carbon dioxide in the planet's atmosphere was announced, marking the second direct detection of CO2 in an exoplanet's atmosphere.
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| February 2025 |
Epsilon Eridani b
James Webb Space Telescope completed observations of Epsilon Eridani, aiming to capture a direct image of the planet when the angular separation between the star and planet was at its maximum.
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| 2024 |
Beta Pictoris b
Future observations by the James Webb Space Telescope are planned to measure the planet's obliquity, which would be the first such measurement in an extrasolar multiplanetary system.
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| 2024 |
Beta Pictoris b
A scientific study investigated the obliquity (axial tilt) of Beta Pictoris b through extensive simulations, revealing potential misalignment that could be caused by interactions with an exomoon or planetary collisions.
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| December 2024 |
Epsilon Eridani b
James Webb Space Telescope began observations of Epsilon Eridani, targeting direct imaging and spectral analysis of Epsilon Eridani b.
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| 2021 |
HR 8799 e
Detection of water and carbon monoxide in the planet's atmosphere was announced, along with an astrometric measurement of the planet's mass.
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| 2020 |
Beta Pictoris b
Orbital misalignment of Beta Pictoris b was precisely measured, revealing a 3-degree misalignment with the rotation of its parent star and debris disk.
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| March 27 2019 |
HR 8799 e
European Southern Observatory announced the first direct observation of an exoplanet using optical interferometry via the GRAVITY instrument on the Very Large Telescope. The observations revealed a complex atmosphere with iron and silicate clouds in a planet-wide storm, and discovered an unexpected carbon monoxide to methane ratio.
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| January 2019 |
Epsilon Eridani b
A research paper was published refining the orbital eccentricity of Epsilon Eridani b to around 0.07, significantly lower than previous estimates, and providing a more precise mass estimate of 0.78 Jupiter masses.
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| 2018 |
Beta Pictoris b
First direct measurement of an exoplanet's astrometric perturbation performed on Beta Pictoris b, marking a significant milestone in exoplanet detection and characterization techniques.
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| 2018 |
Beta Pictoris b
PicSat cubesat was launched with a mission to image Beta Pictoris b transiting its host star. Orbital parameters were measured, revealing the planet is about 11.7 times the mass of Jupiter with a semi-major axis of about 10 AU and an orbital period of about 23.6 years.
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| 2015 |
Beta Pictoris b
A short video was created from direct images taken by the Gemini Planet Imager, showing a time-lapse of the planet orbiting its parent star over approximately two years.
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| December 2015 |
Epsilon Eridani b
James Ott, a 14-year-old, won the International Astronomical Union's NameExoWorlds contest by submitting the names 'AEgir' for the planet and 'Ran' for its host star, giving the exoplanetary system its official mythological names.
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| 2013 |
HR 8799 e
Near infrared spectroscopy at Palomar Observatory revealed evidence of methane and acetylene in the planet's atmosphere, with no signs of ammonia or carbon dioxide.
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| September 2013 |
Beta Pictoris b
A second study provided a new detection at 3.1 μm from the Gemini Observatory, finding the planet overluminous in the mid-infrared band and suggesting it may be younger than its host star.
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| July 2013 |
Beta Pictoris b
First study of the planet's spectral energy distribution was published, revealing detections at multiple wavelengths and showing the planet has a very dusty and/or cloudy atmosphere.
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| 2010 |
Beta Pictoris b
Observations in late 2010 and early 2011 established the planet's orbital inclination angle at 88.5 degrees, nearly edge-on, and its position approximately 3.5 to 4 degrees tilted from the main disk.
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This contents of the box above is based on material from the Wikipedia articles HR 8799 e, 51 Eridani b, Epsilon Eridani b & Beta Pictoris b, which are released under the Creative Commons Attribution-ShareAlike 4.0 International License.