Jupiter's Moon Total Hits 79

Astronomers find 12 new moons around Jupiter

Bringing the now known total to 79.

Several other telescopes were used to confirm the finds, including the 6.5-meter Magellan telescope at Carnegie's Las Campanas Observatory, also in Chile.

The newly discovered Jupiter moons, with diameters of one to three kilometres (0.62 to 1.9 miles), required multiple observations to verify. By contrast, retrograde moons were probably objects that once were wandering around the solar system and got snared by Jupiter's gravity.

The same survey that discovered these 10 also resurveyed two other moons previously discovered by the researchers, who verified the moons' orbital paths.

Two of them are much close to Jupiter and orbit the gas giant in the same direction as the planet's rotation, and are also believed to be part of a larger moon which had broken apart.

Beyond these is a group known as the "prograde" moons - more tiny, irregular satellites, all of which travel around Jupiter in the same direction that the planet rotates (counter-clockwise, in the view shown below). Specifically, they focused on worlds one-half to 20 times Jupiter's mass at least as far away from their stars as Earth is from the sun - excluding hot Jupiters, which are Jupiter-size planets that orbit closer to their stars than Mercury does with the sun. Sheppard describes this as "an unstable situation", noting that collisions between two moons are possible due to the 12th moon's odd orbit.

Astronomers suspect that the retrograde moons may be the remains of larger moons that were destroyed in head-on collisions with prograde objects. "What these other objects were has been a mystery". Because of that small moon's orbit, it may be eventually be destined for an crash.

Two of them are pretty straightforward.

Porte crashes out of Tour de France
Cavendish has 30 career Tour stage wins, four shy of Eddy Merckx's record, but it is now almost two years since his last. At 33, time is starting to run out for Porte to realise his potential in one of the sport's three main stage races .

Donald Trump entering meeting with Vladmir Putin with 'low expectations'
While both Putin and Trump spoke about the need to discuss arms control issues, they are unlikely to make any quick deals. President Donald Trump named the European Union as a "foe", along with Russian Federation and China.

Bombs kill more than 130 after Pakistan election rallies targeted
Raisani, who was a candidate from PB-35 (Mastung), was among those killed in the attack . Caretaker home minister Agha Umar Bungalazi said 300 people were wounded in the bombing.

From Jupiter's entire collection of 79 moons, Sheppard has been involved in the discovery of 54 of them, including most of the known retrograde moons. Nearly all of Jupiter's prograde moons are believed to be fragments of a larger moon that broke apart. One possibility is NASA's Europa moon mission planned in the late 2020s or early 2030s. Now, with a new announcement from a team of astronomers, led by Scott S. Sheppard from the Carnegie Institution for Science, Jupiter's tally now jumps to a total of 79 known moons.

Tentatively named Valetudo, after the Roman goddess of health and cleanliness, and great-granddaughter of Jupiter, the moon is more distant and more inclined than the group of inner prograde moons. That puts it on a possible collision course with a retrograde moon. Sheppard's team speculates Valetudo could be a remnant of a collision between one or more moons.

Gareth Williams, an astronomer at the Harvard-Smithsonian Center for Astrophysics and director at the International Astronomical Union's Minor Planet Center, predicted that "there aren't any bigger objects undiscovered out there" around Jupiter.

If they had formed earlier, the influence of gas and dust would have created drag and caused them to spiral inward to the planet, lost forever. That meant the entire process took a full year.

"A full paper will likely be written after these simulations are done in a few months".

Researchers found the new moons thanks to a telescope upgrade.

"It's a lovely result, and it really does highlight the importance of keeping looking out there", Horner said.

Related news:

Hot News

isis-killer-beheading-video-story-top Amazon's Prime Day results
Jul 19, 2018 - 01:11
Shoppers, meanwhile, have lots of sales to choose from as other retailers offer promotions to try to take a share of the spending. Without fail, every Black Friday at least one major retailer will experience a website outage due to the influx of shoppers.

isis-killer-beheading-video-story-top Trump has 'low expectations' for summit with Putin today
Jul 19, 2018 - 00:31
Bolton described the meeting as "unstructured", saying: "We're not looking for concrete deliverables here". Most Germans consider US President Donald Trump a bigger threat than Russian President Vladimir Putin .

isis-killer-beheading-video-story-top Milwaukee Bucks Forward Jabari Parker Hosts Pickup Game In Local Park
Jul 19, 2018 - 00:31
As reported by ESPN , Jabari Parker has been signed by the Chicago Bulls to a two-year $40 million contract. For local fans that had the chance to shoot hoops with Parker on Thursday night, some are sad to see him go.

isis-killer-beheading-video-story-top Trump Praises Queen and Announces 2020 Presidential Run
Jul 18, 2018 - 00:46
"I'm happy to sit down and listen and hear concerns from my colleagues", the prime minister told lawmakers. Noting the deep divisions in government and parliament on the way forward, she said voters must now decide.

isis-killer-beheading-video-story-top Theresa May survives knife-edge customs vote
Jul 18, 2018 - 00:44
Applying EU tariffs to products destined for the EU is part of Mrs May's plan to avoid friction at United Kingdom borders after Brexit.

isis-killer-beheading-video-story-top Cher Will Bless The World With An ABBA Cover Album
Jul 18, 2018 - 00:38
Amanda Seyfried and Lily James didn't make as bold of an entrance, though their outfits clearly spoke for themselves. She performs ABBA's Fernando in the film with Andy Garcia , who plays hotel manager Fernando Cienfuegos.

isis-killer-beheading-video-story-top World Cup triumph afterglow raises French spirits
Jul 18, 2018 - 00:31
Luka Modric: Croatia captain Modric was named player of the tournament after inspiring his side to reach the final in Moscow. The Etoile station is, for now, "On a 2 Etoiles" (We have 2 stars), to denote France's second World Cup victory.

isis-killer-beheading-video-story-top Israel Passes Law To Ban Groups Critical Of State, Military From Schools
Jul 18, 2018 - 00:30
Over 130 Palestinians have been killed by Israeli fire since the protests began on March 30. Israel says the naval blockade is necessary to protect its citizens from weapon smuggling.

isis-killer-beheading-video-story-top Netflix is getting whacked after adding fewer subscribers than expected (NFLX)
Jul 18, 2018 - 00:29
It had projected the addition of 6.2 million subscribers in the quarter, but it managed to get 5.2 million instead. Despite the subscriber miss, Netflix CEO Reed Hastings said the company's fundamentals have never been stronger.

isis-killer-beheading-video-story-top NWS Forecast: Hot, Stormy Tuesday With Possible Flooding
Jul 18, 2018 - 00:29
The main impact from these storms will be very heavy, torrential downpours, potentially causing some localized flash flooding. Heavy rain will enter the Washington, D.C., Philadelphia, New York City and Boston regions late Tuesday afternoon.

isis-killer-beheading-video-story-top Transfer: Ronaldo will make Real Madrid regret selling him to Juventus - Rossi
Jul 17, 2018 - 02:57
I feel at my best both physically and mentally". "Players of my age usually go to other countries with all due respect". My career has not had anything easy and I am one who likes to get out of my comfort zone. "I can't wait to play.

isis-killer-beheading-video-story-top Manchester United agree deal to sell Daley Blind to Ajax
Jul 17, 2018 - 02:30
Manchester United's Daley Blind is set for a return to Ajax after the two clubs reportedly agreed a £14.1m fee for the defender. Since the arrival of Jose Mourinho the centre back, who can also play in midfield, has been used sparingly.

Photos of the christening of Prince Louis - cute! - CBBC Newsround
Jul 17, 2018 - 01:56
The christening photos were captured by photographer Matt Holyoak and four of them have now been released to the public. The photographs were taken at Clarence House by Matt Holyoak , on the day of Louis' christening at St.

isis-killer-beheading-video-story-top Caver who helped in Thailand rescue considers legal action against Elon Musk
Jul 17, 2018 - 01:33
Musk, the CEO of SpaceX and Tesla, offered no evidence or justification for his claim that Unsworth is a pedophile. Musk was swift, but he doubled down in another now-deleted tweet that read, "bet ya a signed dollar it's true".

Tour de France: Tearful Richie Porte crashes out with shoulder injury
Jul 16, 2018 - 01:01
Once again, we will try to keep looking forward to the end of the Tour and try to take some stages if it's possible as the GC and podium is gone".