Risk of collision as 'oddball' moon found among new Jupiter satellites

19 Juillet, 2018, 13:08 | Auteur: Therese Cote
  • 12 new jupiter moons

A team led by astronomer Scott Sheppard out of the Carnegie Institution for Science discovered the moons in 2017 using one of the most powerful digital cameras in the world, the Dark Energy Camera.

Based on the team's observations, Gareth Williams at the International Astronomical Union's Minor Planet Center was able to calculate the orbits of the moons.

But one moon, tentatively dubbed "Valetudo" (green), is an oddball, orbiting with Jupiter's spin but within the retrograde cluster. Followup observations were conducted from four other telescopes, in Chile, Arizona and Hawaii, to confirm the finds. "So, the whole process took a year". "It's basically like you're driving down the highway in the wrong direction", Sheppard says.

The existence of so many small satellites suggests that they arose from cosmic collisions after Jupiter itself formed, more than 4 billion years ago. What they found were 12 new moons orbiting the planet.

All of these new moons are very small, only about one to three kilometers across (a kilometer is 0.6 miles).

The newly-discovered retrograde moons are estimated to take about two years to orbit Jupiter.

The announcement on Tuesday by researchers in the United States brought the total number of the moons known to be circling the giant gas planet to 79.

Astronomers Just Announced The Discovery of 12 New Moons Around Jupiter

The discovery of this collection of moons was actually made by accident as the team had been observing further into space in the hope of finding 'Planet Nine', the so-far theoretical planet that could exist at the farthest-flung part of our solar system.

The team proposed naming that tiny moon Valetudo, after the goddess of health and hygiene. The retrograde moons take roughly two years to orbit the planet.

Jupiter has dozens of moons, including the large Galilean satellites, including Io and Europa, in this composite image. The circumstances of the moons' orbits lend further support to the view that they were formed long after Saturn and its larger moons coalesced from a primordial cloud of gas and dust. Because the planet is so big and bright, researchers surmised that unrecorded moons could be faint, or even obscured, or quite far from the gas giant. Nine objects, which are in three different groups, are likely the remnants of larger moons that broke apart during collisions.

A moon is defined as any object, regardless of size, that orbits a planet, not the Sun. The orbits of 9 other small Jovian moons are yet unknown. Sheppard's team speculates Valetudo could be a remnant of a collision between one or more moons.

The team's results are not yet available in a peer-reviewed journal, as Sheppard's team is now running supercomputer simulations to try and figure out how often Valetudo might collide with a retrograde moon. For the other 11 moons, Sheppard said they might let the public help out.

Because Valetudo's orbit crosses the orbits of some of the outer retrograde moons, it's possible that it suffered a head-on collision in the past. Now, thanks to a search that was primarily for Planet Nine, astronomers have discovered even more - 79 in total.

It also shows that, while we continue to gaze out into the universe for new discoveries, we are certainly not done discovering new objects, in our very own "backyard".

Négociations en cours entre Chelsea et Barcelone pour Kanté selon Di Marzio
D'après lui, le club catalan s'activerait pour se renforcer dans l'entrejeu après les départs d'Andrés Iniesta et Paulinho . Chelsea n'est pas contre une vente de son milieu de terrain français, mais uniquement si l'affaire financière est belle.

Two die after boat capsizes at Malin Head
The man in his 60's was recovered just before 6pm, two hours after the boat had capsized, and was pronounced dead at the scene. The alarm was raised by holidaymakers on the shoreline after they heard cries of "help". "They were in the water a long time".

Priyanka, the Tamil TV actress found dead
She was most prominently noted for her role as the sister of the protagonist in one of the storylines in the TV serial " Vamsam ". The actress had become a household name after her role of Jyothika in Ramya Krishnan's Tamil television show, Vamsam .

Conseillé:

  • Facebook boss Mark Zuckerberg in Holocaust denial dispute

    Facebook boss Mark Zuckerberg in Holocaust denial dispute

    While he said that, as a Jew, he finds that "deeply offensive", he doesn't think it is a cause for removal. Zuckerberg is correct that it's not always easy to differentiate hucksters from kooks.
    Riot Police Called to Nike Store in France Following World Cup Victory

    Riot Police Called to Nike Store in France Following World Cup Victory

    Deschamps, who became the third person to win as both a player on the field and a coach on the bench, looked like he loved it. Police fired tear gas as sporadic clashes broke out in Paris , Lyon, Strasbourg and Rouen and several people were arrested.
    Amesbury novichok victim's brother says nerve agent was 'found in perfume bottle'

    Amesbury novichok victim's brother says nerve agent was 'found in perfume bottle'

    Police announced on Friday that "scientists have now confirmed to us that the substance contained within the bottle is Novichok". Mr Skripal and his daughter were found unconscious on a bench in Salisbury after the poisoning, but have both since recovered.
  • Kylie Jenner Opens Up About How She Got Her Leg Scar

    Clearly, Kylie has her pre-baby body back, showing off her toned stomach. "When I was about 5, my sister and I were playing hide-and-seek and I hid inside this really tall enclosed gate", Kylie told Celebuzz .

    British police believe they know suspects in spy Novichok poisoning

    The two were taken ill at an address in Amesbury, Wiltshire - less than ten miles from Salisbury - at the start of this month. A high police presence remains in Salisbury and Amesbury as searches of properties and a clean-up of public places continues.
    Comey: If You Believe In America, Vote For Democrats

    Comey: If You Believe In America, Vote For Democrats

    Democrats were largely aggravated by his treatment of Hillary Clinton during the 2016 campaign. Anthony Weiner (N.Y.), so close to election day.
  • Wreck found of ship 'carrying billions in gold'

    The now bankrupt Donga Construction company previously attempted to explore and salvage the ship in the early 2000s. About 10 percent would be set aside for tourism projects on Ulleungdo, including a museum dedicated to the ship.
    Stewart pushes for more NASCAR events at Eldora

    Stewart pushes for more NASCAR events at Eldora

    Dale Jr. joined Stewart, pushing for NASCAR to add Eldora Speedway to at least the XFINITY Series schedule. If a truck can get around here, a Cup or Xfinity auto can do it too.
    Alisson: Liverpool offer for Brazil goalkeeper accepted by Roma

    Alisson: Liverpool offer for Brazil goalkeeper accepted by Roma

    What Alisson will bring to Liverpool is an assuredness in front of goal , both in terms of making saves and when in possession. And now, according to the Times' Paul Joyce , they've agreed a £66m fee to sign goalkeeper Alisson Becker from AS Roma .
  • L'action Netflix chute, grosse déception sur le nombre d'abonnés — Netflix

    L'action Netflix chute, grosse déception sur le nombre d'abonnés — Netflix

    La déception du deuxième trimestre faisait plonger le titre de 14 pour cent à 343,40 $ US dans les transactions d'après-séance. Le consensus FactSet était de 79 cents par action et 3,94 milliards de dollars de chiffre d'affaires.
    PSG, Meunier :

    PSG, Meunier : "Le club devrait me montrer qu'il me veut vraiment"

    Du haut de ses 35 ans, Dani Alves a encore un an de contrat à Paris mais s'est gravement blessé au genou avant la Coupe du monde. Il y a toujours eu des intérêts pour moi.
    Military parade requested by Trump initially estimated to cost $12M, official says

    Military parade requested by Trump initially estimated to cost $12M, official says

    President Donald Trump's upcoming military parade is expected to cost $12 million, a USA official told ABC News. Rob Manning told reporters earlier this month that the now-canceled U.S.


Populaire

Daniel Sturridge says he wants to remain at Liverpool
They then jet off to the United States for three International Champions Cup fixtures against Borussia Dortmund, Manchester City and Manchester United.

Jeremy Pruitt Slammed By Former GA QB Aaron Murray
Murray graduated right before Pruitt was hired by former UGA coach Mark Richt as a defensive coordinator. Yeah, I know you want to be game planning and getting ready for the game, but you're a head coach now.

Bohemian Rhapsody trailer: Rami Malek transforms into Freddie Mercury
The film centres around the band's rise to fame and their performance at London's Wembley Arena for Live Aid 1985. He left fans stunned by his transformation to legendary musician Freddie Mercury.

Trump says he 'misspoke' after Putin meeting, accepts Russian election meddling
Senate Majority Leader Mitch McConnell said earlier Tuesday he wouldn't critique Trump's appearance with Putin. Other party leaders and lawmakers called it " disgraceful ", "shameful", "regrettable" and "disappointing".

Environment Canada issues heat warning for southern Interior
Environment Canada warns that swelling, rash, cramps, fainting, heat exhaustion and heat stroke are all effects of heat illness. The risk of severe thunderstorms is associated with a cold front moving from west to east over northeastern Ontario today.

OL : Le Barça est à côté de la plaque avec cette offre
En effet, le club rhodanien lorgne depuis plusieurs semaines sur Yerry Mina , l'une des révélations de la Coupe du monde . Parallèlement à cela, il a réalisé de bonnes performances en Coupe du Monde avec la Colombie cet été, inscrivant 3 buts.

Plus de 35 ans carrière et une fortune colossale — Céline Dion
La liste est dominée par une femme d'affaires du Wisconsin, Diane Hendricks, qui possède 4,9 milliards de dollars américains. Une 46e place qu'elle partage à égalité avec Adi Tatarko, femme d'affaires californienne dans le design d'intérieur.

Stone wins Scottish Open, Hend slips out
Hend slipped to tied-14th place, just three shots off a possible qualifying berth at the British Open. A European Tour win, a cheque for £880,000 and a place in the Open at Carnoustie this week.

Prime Minister names new federal cabinet
Wilkinson hails from a riding not far from the terminus of the Trans Mountain pipeline expansion project in Burnaby, B.C. But Blair will be prepared, having stoically served as the Trudeau government's main political spokesman on cannabis.

Bicyclist ignores stop arms, falls into drawbridge's gap
The woman was cited for failure to obey a traffic signal, and taken to hospital for facial injuries sustained during her fall. In the video you can see a woman on a bicycle maneuver past the arms, hit one and almost fall off her bike.