NASA’s ISS-RapidScat Earth Science Mission Ends

NASA’s International Space Station Rapid Scatterometer (ISS-RapidScat) Earth science instrument has ended operations following a successful two-year mission aboard the space station. The mission launched Sept. 21, 2014, and had recently passed its original decommissioning date.

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NASA Opens Media Accreditation for Hurricane Microsatellites Launch

Media accreditation now is open for the launch of NASA’s Cyclone Global Navigation Satellite System (CYGNSS) mission, currently scheduled for Monday, Dec. 12.

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NASA Television to Air International Space Station Cargo Ship Launch, Docking

A Russian cargo spacecraft is set to launch Thursday, Dec. 1, to deliver more than two and a half tons of food, fuel and supplies to the International Space Station crew. Coverage on NASA Television and the agency’s website begins at 9:30 a.m. EST ahead of the 9:51 a.m. (8:51 p.m. Baikonur time) launch.

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Real People Behind Hidden Figures, Stars Join NASA to Mark Anniversary, Celebration of Diversity

NASA will kick off a yearlong centennial celebration for its Langley Research Center in Hampton, Virginia, with events Thursday, Dec. 1 highlighting the critical work done by the African American women of Langley’s West Computing Unit, a story told in the book and upcoming movie Hidden Figures.

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NASA Selects Launch Services for Global Surface Water Survey Mission

NASA has selected Space Exploration Technologies (SpaceX) of Hawthorne, California, to provide launch services for the agency’s Surface Water and Ocean Topography (SWOT) mission. Launch is targeted for April 2021 on a SpaceX Falcon 9 rocket from Space Launch Complex 4E at Vandenberg Air Force Base in California.

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NASA TV News Conference, Media Availability with Next Space Station Crew

NASA astronaut Jack Fischer and cosmonaut Fyodor Yurchikhin of the Russian space agency Roscosmos, who are targeted to launch to the International Space Station in March, will participate in a news conference at 2 p.m. EST Wednesday, Nov. 30, at the agency’s Johnson Space Center in Houston. The news conference will air live on NASA Television.

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NASA Successfully Launches NOAA Advanced Geostationary Weather Satellite

NASA successfully launched for the National Oceanic and Atmospheric Administration (NOAA) the first in a series of highly advanced geostationary weather satellites Saturday from Cape Canaveral Air Force Station in Florida.

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NASA Awards Space Studies Board Contract

NASA has awarded a sole-source contract to the National Academy of Sciences, Engineering and Medicine of Washington to conduct studies on questions of national importance within the domain of NASA science and technology programs relating to space science, Earth science, and biological and physical science in space.

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New Crew Launches to Space Station to Continue Scientific Research

Three crew members representing the United States, Russia and France are on their way to the International Space Station after launching from the Baikonur Cosmodrome in Kazakhstan at 3:20 p.m. EST Thursday, Nov. 17 (2:20 a.m. Nov. 18, Baikonur time).

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Icy surprises at Rosetta’s comet

This article is mirrored from the main ESA Web Portal.

Rosetta’s comet approached its most active period last year, the spacecraft spotted carbon dioxide ice – never before seen on a comet – followed by the emergence of two unusually large patches of water ice.

The carbon dioxide ice layer covered an area comparable to the size of a football pitch, while the two water ice patches were each larger than an Olympic swimming pool and much larger than any signs of water ice previously spotted at the comet.

The three icy layers were all found in the same region, on the comet’s southern hemisphere.

A combination of the complex shape of the comet, its elongated path around the Sun and the substantial tilt of its spin, seasons are spread unequally between the two hemispheres of the double-lobed Comet 67P/Churyumov–Gerasimenko.

When Rosetta arrived in August 2014, the northern hemisphere was still undergoing its 5.5 year summer, while the southern hemisphere was in winter and much of it was shrouded in darkness.

However, shortly before the comet’s closest approach to the Sun in August 2015, the seasons changed and the southern hemisphere experienced a brief but intense summer, exposing this region to sunlight again.

In the first half of 2015, as the comet steadily became more active, Rosetta observed water vapour and other gases pouring out of the nucleus, lifting its dusty cover and revealing some of the comet’s icy secrets.

In particular, on two occasions in late March 2015, Rosetta’s visible, infrared and thermal imaging spectrometer, VIRTIS, found a very large patch of carbon dioxide ice in the Anhur region, in the comet’s southern hemisphere.

This is the first detection of solid carbon dioxide on any comet, although it is not uncommon in the Solar System – it is abundant in the polar caps of Mars, for example.

Comet images and spectra taken by VIRTIS on 21–22 March, with the unmistakable signature of carbon dioxide ice: a series of three absorption lines at wavelengths around 2 microns, and two additional absorption lines at 2.7 and 2.78 microns. These characteristic features are not present in the spectrum of water ice. Later images and spectra, taken by VIRTIS on 12–13 April, show that the signature of carbon dioxide ice had disappeared. Credit: data: ESA/Rosetta/VIRTIS/INAF-IAPS/OBS DE PARIS-LESIA/DLR; Reprinted with permission from G. Filacchione et al., Science 10.1126/science.aag3161 (2016); context image: ESA/Rosetta/NavCam – CC BY-SA IGO 3.0

“We know comets contain carbon dioxide, which is one of the most abundant species in cometary atmospheres after water, but it’s extremely difficult to observe it in solid form on the surface,” explains Gianrico Filacchione from Italy’s INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, who led the study.

In the comet environment, carbon dioxide freezes at –193ºC, much below the temperature where water turns into ice. Above this temperature, it changes directly from a solid to a gas, hampering its detection in ice form on the surface.

By contrast, water ice has been found at various comets, and Rosetta detected plenty of small patches on several regions.

“We hoped to find signs of carbon dioxide ice and had been looking for it for quite a while, but it was definitely a surprise when we finally detected its unmistakable signature,” adds Gianrico.

The patch, consisting of a few percent of carbon dioxide ice combined with a darker blend of dust and organic material, was observed on two consecutive days in March. This was a lucky catch: when the team looked at that region again around three weeks later, it was gone.

Assuming that all of the ice had turned into gas, the scientists estimated that the 80 x 60 m patch contained about 57 kg of carbon dioxide, corresponding to a 9 cm-thick layer. Its presence on the surface is likely an isolated rare case, with the majority of carbon dioxide ice being confined to deeper layers of the nucleus.

Gianrico and his collaborators believe the icy patch dates back a few years, when the comet was still in the cold reaches of the outer Solar System and the southern hemisphere was experiencing its long winter. At that time, some of the carbon dioxide still outgassing from the interior of the nucleus condensed on the surface, where it remained frozen for a very long while, and vaporised only as the local temperature finally rose again in April 2015.

This reveals a seasonal cycle of carbon dioxide ice, which unfolds over the comet’s 6.5 year orbit, as opposed to the daily cycle of water ice, also spotted by VIRTIS shortly after Rosetta’s arrival.

Interestingly, shortly after the carbon dioxide ice had disappeared, Rosetta’s OSIRIS narrow-angle camera detected two unusually large patches of water ice in the same area, between the southern regions of Anhur and Bes.

The appearance of two bright patches of water ice (indicated as A and B) in the Anhur and Bes regions of Comet 67P/C–G. The patches were first observed in April 2015 and persisted for about 10 days before they completely disappeared. The water ice patch indicated as A was likely lurking underneath the carbon dioxide ice sheet revealed by Rosetta’s VIRTIS instrument about a month before. Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; Reprinted with permission from S. Fornasier et al., Science 10.1126/science.aag2671 (2016)

“We had already seen many metre-sized patches of exposed water ice in various regions of the comet, but the new detections are much larger, spanning some 30 x 40 m each, and they persisted for about 10 days before they completely disappeared,” says Sonia Fornasier from LESIA–Observatoire de Paris and Université Paris Diderot, France, lead scientist of the study focusing on seasonal and daily surface colour variations.

These ice-rich areas appear as very bright portions of the comet surface reflecting light that is bluer in colour compared with the redder surroundings. Scientists have experimented with mixtures of dust and water ice to show that, as the concentration of ice in them increases, the reflected light becomes gradually bluer in colour, until reaching a point where equal amounts of light are reflected in all colours.

The two newly detected patches contain 20–30% of water ice mixed with darker material, forming a layer up to 30 cm thick of solid ice. One of them was likely lurking underneath the carbon dioxide ice sheet revealed by VIRTIS about a month before.

“On a global scale, we also found that the entire comet surface turned increasingly bluer in colour as it approached the Sun and the intense activity lifted off large amounts of dust, exposing more of the ice-rich terrain underneath,” explains Sonia.

As the comet moved away from the Sun, the scientists observed the overall colour of the comet surface gradually turning redder again.

The colour of visible light reflected by Comet 67P/Churyumov–Gerasimenko on 1 August 2014 (left), shortly before Rosetta arrived at the comet, and a year later, on 30 August 2015 (right), shortly after the comet’s closest approach to the Sun. The maps are derived from the comparison of images taken at wavelengths between 535 and 882 nm with Rosetta's OSIRIS narrow-angle camera. ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; Reprinted with permission from S. Fornasier et al., Science 10.1126/science.aag2671 (2016)

They also revealed local variations of colour, indicative of the daily cycle of water ice. Quickly turning into water vapour when exposed to sunlight during the local daytime, it condensed back into thin layers of frost and ice as the temperature decreases after sunset, only to vaporise again on the following day.

The distribution of water ice beneath the dusty surface of the comet seems widely but not uniformly spread, with small patches punctuating the nucleus, appearing and disappearing as a result of the comet's activity.

Occasionally, larger and thicker portions of ice are also uncovered, dating back to a previous approach to the Sun.

“These two studies of the comet's icy content are revealing new details about the composition and history of the nucleus,” says Matt Taylor, ESA Rosetta project scientist.

“While the flight part of the mission is now over, the scientific exploitation of the enormous quantity of data collected by Rosetta continues.”

--

“Seasonal exposure of carbon dioxide ice on the nucleus of comet 67P/Churyumov–Gerasimenko” by G. Filacchione et al and “Rosetta’s comet 67P/Churyumov–Gerasimenko sheds its dusty mantle to reveal its icy nature” by S. Fornasier et al are published in the journal Science.

About VIRTIS
The Visible, InfraRed and Thermal Imaging Spectrometer VIRTIS was built by a consortium of Italy, France and Germany, under the scientific responsibility of IAPS, Istituto di Astrofisica e Planetologia Spaziali of INAF, Rome (IT), which lead also the scientific operations. The VIRTIS instrument development for ESA has been funded and managed by ASI, with contributions from Observatoire de Meudon financed by CNES and from DLR. The VIRTIS instrument industrial prime contractor was former Officine Galileo, now Leonardo (Finmeccanica Group) in Campi Bisenzio, Florence, IT.

About OSIRIS
The scientific imaging system OSIRIS was built by a consortium led by the Max Planck Institute for Solar System Research (Germany) in collaboration with CISAS, University of Padova (Italy), the Laboratoire d'Astrophysique de Marseille (France), the Instituto de Astrofísica de Andalucia, CSIC (Spain), the Scientific Support Office of the European Space Agency (The Netherlands), the Instituto Nacional de Técnica Aeroespacial (Spain), the Universidad Politéchnica de Madrid (Spain), the Department of Physics and Astronomy of Uppsala University (Sweden), and the Institute of Computer and Network Engineering of the TU Braunschweig (Germany). OSIRIS was financially supported by the national funding agencies of Germany (DLR), France (CNES), Italy (ASI), Spain (MEC), and Sweden (SNSB) and the ESA Technical Directorate.

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NASA Receives Sixth Consecutive Clean Audit Opinion

NASA has received an unmodified audit opinion on its Fiscal Year 2016 (FY 2016) financial statements, marking the sixth consecutive year of “clean” opinions. The agency has released its FY 2016 Agency Financial Report (AFR), which provides details on its financial results and performance highlights.

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US Cargo Ship Set to Depart Space Station, Live NASA TV Coverage

One month after launching from NASA’s Wallops Flight Facility in Virginia, Orbital ATK’s Cygnus cargo spacecraft is set to leave the International Space Station at 8:20 a.m. EST Monday, Nov. 21. Live coverage of the spacecraft departure will begin at 8 a.m. on NASA Television and the agency’s website.

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Colorado Students to Speak with NASA Astronaut on Space Station

Students in Wheat Ridge, Colorado, will have the opportunity to speak with a NASA astronaut currently living and working aboard the International Space Station at 12:40 p.m. EST Friday, Nov. 18. The 20-minute, Earth-to-space call will air live on NASA Television and the agency’s website.

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NASA Updates 2017 International Space Station Crew Assignments

NASA and its international partners have updated the assignments for several crew rotations to the International Space Station in 2017. The changes reflect a switch in assignments for some NASA astronauts, as well as a reduction in the number of Russian cosmonauts on some missions.

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NASA Awards Contract for Atmospheric Science, Data Assimilation Support

NASA has awarded the Support for Atmospheres, Modeling, and Data Assimilation (SAMDA) contract to Science Systems and Applications, Inc., of Lanham, Maryland. This contract will support the atmospheric science and data assimilation research conducted by scientists at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

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Space Science Image of the Week: NAVCAM close-ups

A trio of the closest NAVCAM images of Comet 67P-Churyumov Gerasimenko is featured as our ESA Space Science Image of the Week.

During the last few weeks of its mission at Comet 67P/C–G, the Rosetta spacecraft ventured closer than it had ever been to the surface of the nucleus. Eventually, it came to rest on the small lobe of the comet in a daring descent on 30 September 2016. No navigation images were taken during the descent; the last five NAVCAM images were taken several hours earlier, between about 20 and 17 km from the comet centre.

This montage features the three closest images of the comet's surface taken by Rosetta's navigation camera – acquired in the first half of September. 

The left image in the composite (also shown below) was taken on 8 September, some 2.6 from the comet surface.

Enhanced NAVCAM image of Comet 67P/C-G taken on 8 September 2016, 4.3 km from the comet centre and about 2.6 km from the surface. The distance from Rosetta to the closest pixel in this image is 2.3 km. The scale is 0.2 m/pixel and the image measures about 225 m across. Credits: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

Context view for the 8 September NAVCAM image. Credit: ESA

The image shows a portion of the large comet lobe, portraying the boundary between the Ash and Seth regions. A context view is provided in the image on the right.

This view reveals the dust-covered terrains of Ash in the lower right part of the frame, declining towards Seth in the upper left, where part of one of the many round features present in this region is visible.

The central frame in the composite (also shown below) was taken on 14 September, about 2.6 km from the comet surface.

Enhanced NAVCAM image of Comet 67P/C-G taken on 14 September 2016, 4.2 km from the comet centre and about 2.6 km from the surface. The distance from Rosetta to the closest pixel in this image is 2.4 km. The scale is 0.2 m/pixel and the image measures about 225 m across. Credits: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

Context view for the 14 September NAVCAM image. Credit: ESA

This image provides a detailed view of small and large boulders scattered in the Anubis region, which is also located on the large comet lobe and separated by a scarp from Seth. A context view is provided in the image on the right.

On the right in the composite (and shown below), an image from 11 September shows another view of the Seth region.

Enhanced NAVCAM image of Comet 67P/C-G taken on 8 September 2016, 4.5 km from the comet centre and about 3.5 km from the surface. The distance from Rosetta to the closest pixel in this image is 3.2 km. The scale is 0.3 m/pixel and the image measures about 310 m across. Credits: ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

Context view for the 8 September NAVCAM image. Credit: ESA

Taken about 3.5 km from the comet surface, the view reveals a terrace casting dramatic shadows on the underlying terrain, covered in dust and boulders. A context view is provided in the image on the right.

Comet 67P/Churyumov–Gerasimenko is now moving along the part of its orbit that is farthest from the Sun, in the outer Solar System, between the orbits of Mars and Jupiter. Today, it is over 600 million km from the Sun and over 740 million km from Earth.

All images from Rosetta's navigation camera are available online via the Archive Image Browser.

The three original NAVCAM images are provided below.

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An encounter with Klim Churyumov

Artist's impression of Philae landing on Comet 67P/Churyumov-Gerasimenko. Credit: ESA/ATG medialab

Two years ago this week, the entire world was getting ready for a historic endeavour in space: the first soft landing of a human-made probe on a comet.

On 12 November 2014, Rosetta's lander Philae landed on Comet 67P/Churyumov–Gerasimenko, and while the landing didn't go exactly as planned, Philae finally managed to secure itself to the nucleus and to conduct a series of scientific experiments in situ, while Rosetta kept observing the comet from a distance until the mission's end last September.

As communicators of ESA's science missions, we gathered at the European Space Operations Centre (ESOC) in Darmstadt, Germany, to follow Philae's landing and report it via ESA's web and social media. During the week, ESOC was packed with scientists and engineers from the Rosetta and Philae teams, members of the international press and a number of special guests. Among them was also Professor Klim Churyumov, who together with Svetlana Gerasimenko had discovered the comet back in 1969, and who sadly passed away last month.

Professor Churyumov and his translators with a 3D model of Comet 67P/Churyumov-Gerasimenko at ESOC on 11 November 2014. Credit: ESA/C.Carreau

The day before landing – two years ago today – I had the pleasure to briefly meet Professor Churyumov and even asked him a few questions, taking down notes with the help of his translators. Back then, I was planning to write down a transcript of that conversation for this blog, but in the end the chance did not materialise at the time. Then recently, while going through my old notebooks, I found the notes from that brief interview and finally had some time to share them with the readers of the blog.

At the time, in November 2014, Rosetta had been at the comet for only three months, during which it had taken many striking pictures of this incredible little world. I asked Klim what were his expectations of how “his” comet would look like, and the reaction to Rosetta's first close-up images. He said he was very amazed to discover that 67P/C-G consists of two lobes. Of course, he was not surprised that it had an irregular shape, as most comets do because of their small mass.

According to my notes and to the translation, Klim had compared Comet 19P/Borrelly to a potato, Comet 81P/Wild (also known as Wild 2) to an elongated grapefruit, and Comet 67P/C-G... well, to him it looked like a shoe! Indeed, he said the unexpected and beautiful shape of the comet nucleus reminded him of some traditional Ukranian shoes made of straw and used by local farmers. We all joked of how “his” comet was in fact a “cosmic slipper”.

Klim Churyumov at ESOC on 11 November 2014. Credit: ESA/C.Carreau

He added that the landscapes of the comet reminded him of mountain ranges on Earth, with peaks and valleys, like in the Alps or in the Carpathians, but smaller.

He also pointed out that this comet has spent most of its life time much farther away from the Sun than it currently does, as it was an encounter with Jupiter in 1959 that reduced the comet's perihelion and led it to its present orbit, incidentally making it possible for Svetlana Gerasimenko and himself to discover it ten years later. As such, he thought of the comet as a time capsule, a “Greetings from the Past” message for scientists to investigate.

I also asked him about the next steps and what he'd be most looking forward to in terms of the scientific exploitation of the data from Rosetta. He was eagerly waiting for Philae's descent and the first measurements to be performed on the surface of a comet.

He also mentioned that comets might have brought to our planet water and other molecules crucial to the emergence of life as we know it on Earth, and recalled the findings of NASA's Stardust mission, which detected the amino acid glycine at Comet Wild 2. He was hoping Rosetta would find amino acids at “his” comet too... and many months later, it actually happened, as Rosetta detected glycine at Comet 67P/C-G.

As for water, Klim said he had no doubts that Earth's water comes from space, and was looking forward to Rosetta's measurements of the isotopic composition of water at the comet. In fact, that result was published only a month after our conversation, demonstrating that water at Comet 67P/C-G contains three times more deuterium than water on Earth, and fuelling once again the debate on the main carriers of water to our planet’s oceans – comets or asteroids?

Klim Churyumov (left) with Sam Gulkis (right), principal investigator of the MIRO instrument on Rosetta, at Philae's comet landing event in ESOC. Credit: ESA/C.Carreau

Klim said he was also looking forward to the measurements of the electric and magnetic field by the Rosetta Plasma Consortium suite of sensors on the orbiter and the ROMAP instrument on Philae, as well as to the results of the Radio Science Experiment (RSI) and of the CONSERT radar experiment to probe the comet's interior. Several studies based on data from these instruments were published on scientific journals in the past couple of years, and I hope that he had a chance to read about these interesting results.

As a final remark, he mentioned having a dream: he would have loved to be an astronaut, travel to the comet to have a walk on the surface, take some pictures and safely come back to Earth. And he was sure something like this would become possible in the future.

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NASA Awards Contract for Flight Operations Support

NASA has awarded contracts to nine companies to provide specialized engineering, aeronautics, and manufacturing support for Flight Operations Directorate work, facilities, and aircraft at the agency’s Johnson Space Center in Houston.

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Next Space Station Crew Set for Launch Nov. 17, Watch Live on NASA TV

NASA astronaut Peggy Whitson, Oleg Novitskiy of the Russian space agency Roscosmos, and Thomas Pesquet of ESA (European Space Agency) will launch Thursday, Nov. 17, for a six-month stay aboard the International Space Station.

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Rosetta Legacy winner announced

Between 6 September and 7 October 2016, we collected 235 contributions to the Rosetta Legacy tumblr. A huge and sincere thank you to all participants who shared experiences, stories and images of how the mission of Rosetta and Philae to Comet 67P/Churyumov-Gerasimenko has inspired their lives, including study and career choices, artistic practice and other creative endeavours!

The authenticity and ingenuity of the submitted entries was overwhelming, and it has been challenging to pick one top prize winner (apologies for the delay!).

One entry in particular caught the attention of the ESA judges for the combination of creative effort and motivation, so we selected Cristina Romero from Spain as the top prize winner. The prize consists in a special visit to ESTEC, ESA’s technical heart in Noordwijk (The Netherlands).

Below is Cristina's winning entry (translated into English):

“Missions like the one of Rosetta have allowed me to discover the wonderful world of space, and as a result I started to look for more information about these topics and I discovered my passion: space.

Since then, every day I need to learn something new, to read the news about advances in aerospace industry and follow the current missions.

I ended up with such a fascination with all this, that my big dream is to be able one day to study Aerospace Engineering, in order to take part to wonderful missions like this one. This is what's pushing me to keep working hard every day, to save up to accomplish my dream, and every time it takes a little less effort to achieve it.

Cristina Romero's pendant inspired by Rosetta, Philae and Comet 67P.

On September 30, the day Rosetta landed on the comet, while I was watching the webcast, I created this pendant-shaped piece to remember everything that this mission has meant to me. It is entirely handmade with polymer clay, crafted while Rosetta was landing to finally rest on Comet 67P, together with Philae.

Many thanks to ESA and the entire team for sharing this mission with us.

Cristina”

We wish to thank again everyone who shared with us what the mission meant to them, and all followers of Rosetta and Philae worldwide. It is also thanks to you that the legacy of this extraordinary mission will live on forever.

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Rosetta’s deep-space ringtone

Editor's note: Today's post was sent in by Armelle Hubault, a Spacecraft Operations Engineer here at ESOC. Armelle worked on the Rosetta Flight Control Team until the mission ended on 30 September, and she is now part of the Cluster team. As background, note that at ESA, spacecraft are operated by a team comprising an experienced Spacecraft Operations Manager (SOM) and a Flight Control Team, who typically comprise from six to as many as fifteen experienced system engineers, analysts and other experts (depending on the complexity of the spacecraft and the mission – for more details, see Building a team).

One of the responsibilities of the engineers on any mission's Flight Control Team is to monitor the spacecraft and react immediately in case of trouble.

The Rosetta phone Credit: ESA

There are two levels of support for this:

1. The Spacecraft Controllers ('Spacons'), who sit in the dedicated control room on shift and perform routine spacecraft control actions (monitor ground station passes, upload commands, etc.) as well as a undertake some contingency recovery activities
2. The Spacecraft Operation Engineers (SOEs), who take turns being 'on-call' and who can be called by the Spacon in case an anomaly must be further investigated or if a critical problem is detected beyond the expertise of the Spacon

Typically, SOEs must remain within one hour travel time to ESOC when on call.

In order to make the Spacon's life easier (give them just a single number to call) and avoid that engineers must make calls via their personal mobile phones when having to call abroad in the middle of the night (in case of an on-board instrument failure requiring the intervention of the instrument teams, which can be anywhere in Europe or overseas), 'on-call phones' are available for all missions.

In 2004, we got a phone that was quite modern at the time – it had a colour display and rear-lit keyboard – and selected the only available ringtone that was not a beep or a ring, called 'Luminaa'.

This phone has followed us through the whole mission, its battery still holding almost the whole week (when not being called) even after 10 years. Its ringtone was literally engraved in our psyches, such that whenever it would ring, anywhere within earshot, the whole team would jump up and start looking around (until we remembered who was actually on call).

When on call, it also happened to several of us that we would hear the phone ring and we'd start frantically looking for it, before realising it was just a similar sound via the TV – with some of us then realising, 'Oh, I'm not the one having it this week anyway!'.

So when did the phone ring, for real?

Countless times! We all recall being rung up by the Spacon to tell us that a Safe Mode had happened (inevitably in the middle of the night), or that instrument temperatures were running through the roof (usually on Sundays), that ground stations were snowed in and had lost contact with the spacecraft while it was still busy downloading recorded science data (which  – unavoidably – was then lost).

It also rang to tell to us that Philae had called home in June 2015, after we all thought we'd never hear from it again (see: How we heard from Philae).

We were also rung up for a multitude of smaller, less dramatic issues – things that needed an explanation or a just quick look. On a normal on-call shift, at least a few calls were to be expected.

I am quite certain that many years from now, we will still pause and look around, startled, if we happen to hear that 'Luminaa' ringtone or anything that sounds even close.

The ringtone @ESA_Rosetta engineers have been dreading for 10 years. Phone is now off too... http://pic.twitter.com/5OH923eShI

— Armelle Hubault (@Marmelleade) October 6, 2016

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NASA Small Satellites Set to Take a Fresh Look at Earth

Beginning this month, NASA is launching a suite of six next-generation, Earth-observing small satellite missions to demonstrate innovative new approaches for studying our changing planet.

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NASA Announces Media Briefing on New Hurricane Mission

NASA will hold a media briefing at 1 p.m. EST Thursday, Nov. 10, to discuss the upcoming Cyclone Global Navigation Satellite System (CYGNSS) mission, a constellation of eight microsatellites that will gather never-before-seen details on the formation and intensity of tropical cyclones and hurricanes.

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NASA to Hold Media Call on New Small Satellite Missions to Study Earth

NASA will host a teleconference at 2:30 p.m. EDT Monday, Nov. 7, to preview several Earth science missions using small satellites heading into space, starting this year, to help us better understand our home planet.

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NASA Sets GOES-R/Atlas V Launch Events Coverage

The first spacecraft in a new series of NASA-built advanced geostationary weather satellites is set to launch into orbit aboard a United Launch Alliance Atlas V rocket Wednesday, Nov. 16. The two-hour launch window opens at 4:42 p.m. EST. Liftoff will occur from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida.

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