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Astronomy Picture of the Day - 50 Light-years to 51 Pegasi
APOD.NASA.gov ^ | 9 Oct, 2021 | Image Credit & Copyright: Josselin Desmars

Posted on 10/09/2021 4:03:20 PM PDT by MtnClimber

Explanation: It's only 50 light-years to 51 Pegasi. That star's position is indicated in this snapshot from August, taken on a hazy night with mostly brighter stars visible above the dome at Observatoire de Haute-Provence in France. Twenty-six years ago, in October of 1995, astronomers Michel Mayor and Didier Queloz announced a profound discovery made at the observatory. Using a precise spectrograph they had detected a planet orbiting 51 Peg, the first known exoplanet orbiting a sun-like star. Mayor and Queloz had used the spectrograph to measure changes in the star's radial velocity, a regular wobble caused by the gravitational tug of the orbiting planet. Designated 51 Pegasi b, the planet was determined to have a mass at least half of Jupiter's mass and an orbital period of 4.2 days, making it much closer to its parent star than Mercury is to the Sun. Their discovery was quickly confirmed and Mayor and Queloz were ultimately awarded the Nobel Prize in physics in 2019. Now recognized as the prototype for the class of exoplanets fondly known as hot Jupiters, 51 Pegasi b was formally named Dimidium, latin for half, in 2015. Since its discovery, over 4,000 exoplanets have been found.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: nasa
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For more detail go to the link and click on the image for a high definition image. You can then move the magnifying glass cursor then click to zoom in and click again to zoom out. When zoomed in you can scan by moving the side bars on the bottom and right side of the image.

1 posted on 10/09/2021 4:03:20 PM PDT by MtnClimber
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To: MtnClimber

2 posted on 10/09/2021 4:03:44 PM PDT by MtnClimber (For photos of Colorado scenery and wildlife, click on my screen name for my FR home page.)
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To: 21stCenturion; 21twelve; 4everontheRight; abb; AFB-XYZ; America_Right; AZ .44 MAG; BBB333; ...
Pinging the APOD list.

🪐 🌟 🌌 🍔


3 posted on 10/09/2021 4:04:18 PM PDT by MtnClimber (For photos of Colorado scenery and wildlife, click on my screen name for my FR home page.)
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To: MtnClimber

Star identification is shown on the photo at the source link.


4 posted on 10/09/2021 4:19:33 PM PDT by MtnClimber (For photos of Colorado scenery and wildlife, click on my screen name for my FR home page.)
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To: MtnClimber

That’s all? Expected far more more detail


5 posted on 10/09/2021 4:20:41 PM PDT by Musketeer
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