Pierre Kervella

@PierreKervella

Professional astronomer at Paris Observatory (France), head of the education department. I am working on Alpha Centauri, Cepheids and other types of stars.

Meudon, France
Vrijeme pridruživanja: srpanj 2011.

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  1. proslijedio/la je Tweet

    Henrietta Swan Leavitt, one of many women "computers" at Harvard University a century ago, unlocked the key to our three-dimensional universe using Cepheid variable stars.

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  2. 29. sij

    Thank you and for this nice summary of a very interesting paper on the Hubble constant controversy

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  3. proslijedio/la je Tweet
    26. sij

    ok fine, the mean values are even lower, it dimmed a little more...

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    23. sij

    This Is What We'll See When Betelgeuse Really Does Go Supernova There are a lot of visual signals that will arrive, but the neutrinos come first, then there's a brilliant but brief spike in brightness, then a slow rise to maximum, a fall-off, and more.

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    21. sij
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  6. proslijedio/la je Tweet
    23. sij

    Orion et la Licorne, mosaïque de deux séries de poses de 5 minutes, Nikon D810 A, filtre STC et 50 mm à 5.6. Montage vite fait, mais ça donne envie de la refaire sérieusement...

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    20. sij

    Elon Musk, SpaceX Unveil Latest Starlink Plans, Creating An Astronomical Emergency by in

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    19. sij

    Bételgeuse hier soir, dans le ciel brumeux de la banlieue parisienne… Jusqu'ici tout va bien : elle est toujours là. Elle est même sacrément impressionnante, malgré sa chute de luminosité, les gens qui habitent dans les parages doivent pas faire les malins, en ce moment… 😬😉🤓

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  9. proslijedio/la je Tweet
    16. sij
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  10. proslijedio/la je Tweet
    16. sij

    Open call to American lawyers stargazers to look at the possible breach of law. Please spread the words. Let’s save our sky!

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  11. 17. sij

    The core of the star (in red) rotates 50% faster than the envelope (in green). The rotation period of is less than 8 hours, compared to one month for the Sun! This explains its extreme flattening. The paper is freely available here:

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  12. 17. sij

    A new work led by Kevin Bouchaud presents a realistic model of the internal rotation of the star ! It relies on interferometric data and is just published in . Image: Altair compared to the Sun (PR in French)

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    15. sij

    And here comes version 2.0 - higher orbits, so visible all night long. Sky pollution isn't just for dawn and dusk anymore!

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  14. proslijedio/la je Tweet

    Joint spectroastrometry and reverberation mapping provide a novel measurement of the distance to the active galaxy nucleus 3C273 and hence the Hubble Constant. Wang et al.:

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  15. 9. sij
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  16. 9. sij

    The latest observations show that continues to decrease in luminosity in the visible. But in the (JH bands) its is constant. It could mean that a lot of dust (transparent in the ) is forming and blocks a big part of the visible star light.

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  17. 9. sij
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  18. 9. sij
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  19. 9. sij
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  20. proslijedio/la je Tweet
    3. sij

    Orion from last night, Jan 2, with orange still dimmer than usual. This was shot in the light of the quarter Moon and with high haze adding the natural star glows.

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