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    VIRGOCosmos In Brief - Aktualní novinky vesmírného výzkumu v kostce
    VINCENT_BU
    VINCENT_BU --- ---
    Collapsing Star Gives Birth to a Black Hole (without going supernova)
    Astronomers have watched as a massive, dying star was likely reborn as a black hole. It took the combined power of the Large Binocular Telescope (LBT), and NASA's Hubble and Spitzer space telescopes to go looking for remnants of the vanquished star, only to find that it disappeared out of sight. It went out with a whimper instead of a bang. The star, which was 25 times as massive as our sun, should have exploded in a very bright supernova. Instead, it fizzled out –– and then left behind a black hole.

    Star Gives Birth to Possible Black Hole in Hubble and Spitzer Images
    https://www.youtube.com/watch?v=bL1sQjNsuws#t=11


    more also here: https://www.jpl.nasa.gov/news/news.php?feature=6858
    TOXICMAN
    TOXICMAN --- ---
    Schiaparelli: Crashed lander was ill-prepared for Mars - BBC News
    http://www.bbc.com/news/science-environment-40029180#
    VINCENT_BU
    VINCENT_BU --- ---
    ještě jeden obrázek k Tabby's Star, shrnutí fluktuace zdánlivé magnitudy za květnové dny od amatérského pozorovatele. Na stránce http://www.brucegary.net/KIC846/ jsou další grafy.

    TOXYGEN
    TOXYGEN --- ---
    neplanujete niekto v srpnu do USA na zatmenie?
    BLACKHEAD
    BLACKHEAD --- ---
    VIRGO & HOWKING:

    Tak pravdepodobne jen nekldo zaspal u korekce. Podle CHMU.cz se pry vychyluji ty druzice uplne bezne, ale o kousek a doladuje se to datove na zemi. Takze pravdepodobne se jedna o upravu obezne drahy provedenou za pomoci trysek, jen nekdo v Darmstadtu zaspal svoji sluzbu a nestihl tak korekci vcas... :-)
    VINCENT_BU
    VINCENT_BU --- ---
    Cornell University Library
    KIC 8462852: Will the Trojans return in 2021?
    (Submitted on 23 May 2017)

    "[…] We aim at offering a relatively natural solution, invoking only phenomena that have been previously observed, although perhaps in larger or more massive versions. We model the system using a large, ringed body whose transit produces the first dimming and a swarm of Trojan objects sharing its orbit that causes the second period of multiple dimmings. The resulting orbital period is T≈12 years, with a semi-major axis a≈6 au. In this context the recent observation of a minor dimming can be explained as a secondary eclipse produced by the passage of the planet behind the star. Our model allows us to make two straightforward predictions: we expect the passage of a new swarm of Trojans in front of the star starting during the early months of 2021, and a new transit of the main object during the first half of 2023."



    https://arxiv.org/abs/1705.08427

    další komentáře od prof. Davida Kippinga https://twitter.com/david_kipping
    VIRGO
    VIRGO --- ---
    HOWKING: porucha stabil. serva je teda pravděpodobnější, to se stát může,
    možná je to jen problém datový, jak píšeš. Kdyby došlo ke kolizi s mikrosmetím,
    byla by pravděpodobně off úplně. Jsou to neskutečný dardy. Každopádně by se měly
    max. v rámci (desítek) hodin objevit relevantní informace od provozovatele.
    HOWKING
    HOWKING --- ---
    Ale dozvěděl jsem se, že MSG družice je stabilizována vlastní rotací a rotuje severojižním směrem. Takže buď ťukanec do MSG a její změna rotace (následně napravená - ještě večer bylo vidět lehké posouvání Alp, takže to asi dolaďovali), nebo chyba hodin/synchronizace snímků (myslela si že kouká jižněji)
    HOWKING
    HOWKING --- ---
    VIRGO: Bylo vidět, jak se to roztočilo, pak to zastavili, za čas vrátili, ale ještě večer bylo na reliéfu Alp vidět mikroposuvy, jak to dolaďovali. Takž buď něco cvrnklo, nebo se podělal jeden ze stabilizačních setrvačníků, je to jen technika ale klidně to celé mohlo vzniknout na zemi jen v počítači (ale pak nechápu to jemné dolaďování večer)
    VIRGO
    VIRGO --- ---
    HOWKING: Kleplo? Tyjo to je hodně, ale HODNĚ scifi! :-DD

    Jinak se předběžně omlouvám za neaktivitu, zítra mi začíná dovča na jihu, ale teprve dnes jsem
    buknul bydlení, takže teď vůbec nestíhám koukat do vesmíru (ach jo - Tabby's Star!!!!).
    Ale když všechno dobře půjde, příště se přihlásím z pláže.

    PLS: Pokud budete mít čas a chuť, vkládejte cokoliv nového, i když nebudu stíhat sledovat aktuální dění, minimálně jednou denně sem aspoň nakouknu.

    A ještě lépe na g+, pokud tam někdo je.
    Vladimir Pecha - Google+
    https://plus.google.com/113909043605186374111/palette

    Mějte se krásně! Prosím, veškeré nové informace o Tabby mají prioritu 1
    Ale děje se toho hodně i jinde... :-)
    HOWKING
    HOWKING --- ---
    jj, a zdá se mi jako by se to lehce vracelo. Že by fakt něco do družice kleplo a stabilizace zabrala a vrací ji zpět?
    TOXICMAN
    TOXICMAN --- ---
    už je tam pár dalších snímků
    HOWKING
    HOWKING --- ---
    BLACKHEAD: Ale jelikož je to i na ostatních produktech stejné (IR i MF), tak mě napadá, jestli něco fakt nebouchlo do družice!
    BLACKHEAD
    BLACKHEAD --- ---
    HOWKING: Hezky...

    To by me zajimalo, co je spatne... Jestli se sekly data z druzice, nebo nekdo pri zpracovani. Jestli se pohnula samotna druzice, tak je neco hodne spatne... ;-)
    HOWKING
    HOWKING --- ---

    Někdo kopl do Zeměkoule.
    Můžete se na chmi.cz kouknout sami :-D
    VIRGO
    VIRGO --- ---
    VIRGO: Pátý průlet úspěšně absolvován (pátek 8h SELČ).
    Všechny přístroje i JunoCam nabíraly data. První snímky ke stažení:
    JunoCam : Processing | Mission Juno
    https://www.missionjuno.swri.edu/junocam/processing

    PRJ 19/05 - proc. J. Majora

    VIRGO
    VIRGO --- ---
    VIRGO: Čerstvé info z první ruky (Jasona Wrighta)!

    Tabby's Star is dimming right now (archived video of chat with Jason Wright)
    https://www.youtube.com/watch?v=eYpIGZS8nJc


    Astronomers scramble as ‘alien megastructure’ star dims again | New Scientist
    https://www.newscientist.com/...2131871-astronomers-scramble-as-alien-megastructure-star-dims-again/

    The most famously weird star in our galaxy is acting up again. On Friday, 19 May, Tabby’s star began to dim,
    carrying on a history of mysterious dips in brightness. Astronomers are scrambling to point as many telescopes
    as possible at the star, which is 1,300 light-years away in the constellation Cygnus, to decipher its strange signal.

    In 2015, a team of astronomers led by Yale’s Tabetha Boyajian saw the light from the star KIC 8462852 suddenly and
    repeatedly dip in brightness. The star dimmed by up to 22 per cent before it returned to normal.

    Then, in 2016, a review of old photographic plates revealed that KIC 8462852 dimmed by 14 per cent between 1890 and 1989.
    The star, nicknamed Tabby’s star after Boyajian, faded by another 3 per cent over the four years it was observed by t
    he Kepler space observatory.

    Astronomers have come up with a huge variety of different potential explanations for the star’s strange behaviour.
    Some say it could be because of its interior dynamics, some say it could be surrounded by a swarm of asteroids and debris.
    Or maybe it’s dimming because it devoured a planet at some time in the past. Most famously, some astronomers have said that
    the dimming could be caused by an orbiting alien megastructure.

    Because Tabby’s star has cultivated such an air of mystery, the response to its new dimming has been quick and enthusiastic,
    with some telescope observations of the star already planned over the next few days. If we’re lucky, new observations may
    just help us figure out what’s making KIC 8462852 dim (it’s probably not aliens).
    VIRGO
    VIRGO --- ---
    !!!!!!!!!!!

    Tabetha Boyajian‏: TabbysStar IS DIPPING! OBSERVE!!

    Tabetha Boyajian on Twitter: "#TabbysStar IS DIPPING! OBSERVE!! @NASAKepler @LCO_Global @keckobservatory @AAVSO @nexssinfo @NASA @NASAHubble @Astro_Wright @BerkeleySETI"
    https://twitter.com/tsboyajian/status/865530700128075780

    VIRGO
    VIRGO --- ---
    Large volcanic eruption may have caused the first mass extinction | Science Bulletin
    http://sciencebulletin.org/archives/13088.html

    Researchers in the USA and Japan say they may have found the cause of the first mass extinction of life.

    There have been five mass extinctions since the divergent evolution of early animals 600 -450 million years ago.
    The cause of the third and fourth was volcanic activity, while an asteroid impact led to the fifth. But triggers
    of the first and second mass extinctions had, until now, been unknown.
    VIRGO
    VIRGO --- ---
    ‘Styrofoam’ Planet May Help Solve Mystery of Giant Planets | News Article | Lehigh University
    https://www1.lehigh.edu/...s/%E2%80%98styrofoam%E2%80%99-planet-may-help-solve-mystery-giant-planets

    Fifth-graders making Styrofoam models of the solar system may have the right idea. Lehigh researchers have discovered a new planet
    orbiting a star 320 light years from Earth that has the density of Styrofoam. This “puffy planet” outside our solar system may help
    solve the long-standing mystery of the existence of a population of highly inflated giant planets.

    “It is highly inflated, so that while it’s only a fifth as massive as Jupiter, it is nearly 40 percent larger, making it about as
    dense as Styrofoam, with an extraordinarily thick atmosphere,” said Joshua Pepper, astronomer and assistant professor of physics
    at Lehigh, who led the study with researchers from Vanderbilt University and Ohio State University, along with researchers at
    universities and observatories and amateur astronomers around the world.

    The research, “KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V+8 Subgiant HD 93396,”
    is published in The Astronomical Journal.

    The planet, called KELT-11b, is an extreme version of a gas planet, like Jupiter or Saturn, but is orbiting very close to its host
    star in an orbit that lasts less than five days. The star, KELT-11, has started using up its nuclear fuel and is evolving into
    a red giant, so the planet will be engulfed by its star and will not survive the next hundred million years.
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