"the Philae obelisk, which bears a bilingual inscription and was used along with the Rosetta Stone to decipher Egyptian hieroglyphs. ""Philae"" was monitored and operated from DLR's Lander Control Center in Cologne, Germany. ""Philae"" mission was to land successfully on the surface of a comet, attach itself, and transmit data about the comet's composition. The ""Rosetta"" spacecraft and ""Philae"" lander were launched on an Ariane 5G+ rocket from French Guiana on 2 March 2004, 07:17 UTC, and travelled for 3,907 days (10.7 years) to Churyumov–Gerasimenko. Unlike the ""Deep Impact"" probe, which by design struck comet Tempel 1's nucleus on 4"
"""Philae"" was confirmed on 19 June 2015. The first signal was received on the ground from ""Rosetta"" at 13:37 UTC, while a second signal was received at 13:54 UTC. These contacts lasted about two minutes each and delivered additional status data. By 26 June 2015, there had been a total of seven intermittent contacts between the lander and orbiter. There were two opportunities for contact between the two spacecraft each Earth day, but their duration and quality depended on the orientation of the transmitting antenna on ""Philae"" and the location of ""Rosetta"" along its trajectory around the comet. Similarly, as"
"radar instrument on 5 July 2015, but received no immediate response from the lander. Confirmation was eventually received on 9 July, when the lander transmitted measurement data from the instrument. Immediately after its reawakening, housekeeping data suggested that the lander's systems were healthy, and mission control uploaded commands for ""Rosetta"" to establish a new orbit and nadir so as to optimize communications, diagnostics, and enable new science investigations with ""Philae"". However, controllers had difficulties establishing a stable communications connection with the lander. The situation was not helped by the need to keep ""Rosetta"" at a greater and safer distance from"
"the landing problems, the probe's instruments obtained the first images from a comet's surface. Several of the instruments on ""Philae"" made the first direct analysis of a comet, sending back data that will be analysed to determine the composition of the surface. On 15 November 2014 ""Philae"" entered safe mode, or hibernation, after its batteries ran down due to reduced sunlight and an off-nominal spacecraft orientation at its unplanned landing site. Mission controllers hoped that additional sunlight on the solar panels might be sufficient to reboot the lander. ""Philae"" communicated sporadically with ""Rosetta"" from 13 June to 9 July 2015,"
"the comet rotated, ""Philae"" was not always in sunlight and thus not always generating enough power via its solar panels to receive and transmit signals. ESA controllers continued to try to establish a stable contact duration of at least 50 minutes. Had ""Philae"" landed at the planned site of Agilkia in November 2014, its mission would probably have ended in March 2015 due to the higher temperatures of that location as solar heating increased. , ""Philae"" key remaining experiment was to drill into the comet's surface to determine its chemical composition. Ground controllers sent commands to power up the CONSERT"
"the comet as it became more active. The last communication was on 9 July 2015, and mission controllers were unable to instruct ""Philae"" to carry out new investigations. Subsequently, ""Philae"" failed to respond to further commands, and by January 2016, controllers acknowledged no further communications were likely. On 27 July 2016, at 09:00 UTC, ESA switched off the Electrical Support System Processor Unit (ESS) onboard ""Rosetta"", making further communications with ""Philae"" impossible. The lander was located on 2 September 2016 by the narrow-angle camera aboard ""Rosetta"" as it was slowly making its descent to the comet. The search for the"
"of dropping battery power. The European Space Operations Centre briefly reestablished communications on 14 June 2015 and reported a healthy spacecraft but communications were lost again soon after. On 2 September 2016, ""Philae"" was located in photographs taken by the ""Rosetta"" orbiter. It had come to rest in a crack with only its body and two legs visible. While the discovery solves the question of the lander's disposition, it also allows project scientists to properly contextualise the data it returned from the comet's surface. The composition of water vapor from Churyumov–Gerasimenko, as determined by the ""Rosetta"" spacecraft, is substantially different"
"""Philae"" performed the first successful landing on a comet, though its battery power ran out two days later. Communications with ""Philae"" were briefly restored in June and July 2015, but due to diminishing solar power, ""Rosetta"" communications module with the lander was turned off on 27 July 2016. On 30 September 2016, the ""Rosetta"" spacecraft ended its mission by hard-landing on the comet in its Ma'at region. The probe was named after the Rosetta Stone, a stele of Egyptian origin featuring a decree in three scripts. The lander was named after the Philae obelisk, which bears a bilingual Greek and"
"seen for the first time on a comet, including acetamide, acetone, methyl isocyanate and propionaldehyde. On 13 June 2015 at 20:28 UTC, ground controllers received an 85-second transmission from ""Philae"", forwarded by ""Rosetta"", indicating that the lander was in good health and had sufficiently recharged its batteries to come out of safe mode. ""Philae"" sent historical data indicating that although it had been operating earlier than 13 June 2015, it had been unable to contact ""Rosetta"" before that date. The lander reported that it was operating with 24 watts of electrical power at . A new contact between ""Rosetta"" and"
"mass, landing on the comet involved certain technical considerations to keep ""Philae"" anchored. The probe contains an array of mechanisms designed to manage Churyumov–Gerasimenko's low gravity, including a cold gas thruster, harpoons, landing-leg-mounted ice screws, and a flywheel to keep it oriented during its descent. During the event, the thruster and the harpoons failed to operate, and the ice screws did not gain a grip. The lander bounced twice and only came to rest when it made contact with the surface for the third time, two hours after first contact. Contact with ""Philae"" was lost on 15 November 2014 because"
"as the lander's destination. Following an ESA public contest in October 2014, Site J was renamed ""Agilkia"" in honour of Agilkia Island. A series of four Go/NoGo checks were performed on 11–12 November 2014. One of the final tests before detachment from ""Rosetta"" showed that the lander's cold-gas thruster was not working correctly, but the ""Go"" was given anyway, as it could not be repaired. ""Philae"" detached from ""Rosetta"" on 12 November 2014 at 08:35 UTC SCET. ""Philae"" landing signal was received by Earth communication stations at 16:03 UTC after a 28-minute delay. Unknown to mission scientists at that time,"
"its data. It had special cameras that provided various breakthroughs in understanding the dynamics of plasma around the Earth. The Principal Investigator was Jim Burch of the Southwest Research Institute. In January 2018, an amateur satellite tracker found it to be transmitting some signals back to Earth. NASA made attempts to communicate with the spacecraft and determine its payload status, but has had to track down and adapt old hardware and software to the current systems. On 25 February, contact with IMAGE was again lost only to be reestablished on 4 March 2018. The signal disappeared once again on 5"
"to adequately collect solar power, and it lost contact with ""Rosetta"" when its batteries ran out after two days, well before much of the planned science objectives could be attempted. Contact was briefly and intermittently reestablished several months later at various times between 13 June and 9 July, before contact was lost once again. There was no communication afterwards, and the transmitter to communicate with ""Philae"" was switched off in July 2016 to reduce power consumption of the probe. The precise location of the lander was discovered in September 2016 when ""Rosetta"" came closer to the comet and took high-resolution"
"the spacecraft, and the status of data and ground systems can be assessed, it will decide if it can fund a mission restart. On 4 March 2018, the Applied Physics Laboratory at Johns Hopkins University reported detecting the signal from the satellite, but it was too faint to lock onto. On 9 May 2018, Scott Tilley again detected a strong signal from IMAGE. Hours later NASA and APL engineers had locked onto the signal and were receiving telemetry. Commands were transmitted to IMAGE, but for unknown reasons the spacecraft only acknowledged receipt of a fraction of those commands. On 28"
"be ""spinning wildly over two of its axes"" and unable to communicate with its ground station. While efforts were made to reestablish control of ""Pegaso"", on 28 August 2013 the decision was made by EXA and the Ecuadorian government to declare the satellite as lost. On 25 January 2014, EXA recovered the audio segment of the ""Pegaso"" signal during the first public transmission from NEE-02 ""Krysaor"", verifying that ""Pegaso"" had survived its collision with the Tsyklon debris and was operating. EXA announced that it had installed a miniature repeater device aboard ""Krysaor"" called PERSEUS, and that this was used to"
"trajectory when ALHAT was already dead-reckoning. Had less conservative position error limits allowed ALHAT to continue to navigate to landing, the vehicle still would have landed safely on the pad. On November 13, 2014 a swing test of the new optics for the ALHAT Navigation Lidar was performed. The Morpheus/ALHAT team conducted Free Flight 15 (FF15) on December 15, 2015. The sixth free flight the ALHAT sensor suite on board, and a third attempt at completing a historic closed-loop ALHAT flight. The vehicle flew and landed successfully under the control of the ALHAT. The ALHAT is an electrically powered device"
"of life. However, the landing attempt was unsuccessful and the lander was declared lost. A Commission of Inquiry on ""Beagle 2"" identified several possible causes, including airbag problems, severe shocks to the lander's electronics which had not been simulated adequately before launch, and problems with parts of the landing system colliding; but was unable to reach any firm conclusions. The spacecraft's fate remained a mystery until it was announced in January 2015 that NASA's Mars Reconnaissance Orbiter, using HiRISE, had found the probe intact on the surface of Mars. It was then determined that an error had prevented two of"
"to deploy. Subsequently, MUPUS data as well as COSAC and Ptolemy data were returned. A final set of CONSERT data was also downlinked towards the end of operations. During the evening's transmission session, ""Philae"" was raised by and its body rotated 35 degrees to more favourably position the largest solar panel to capture the most sunlight in the future. Shortly afterwards, electrical power dwindled rapidly and all instruments were forced to shut down. The downlink rate slowed to a trickle before coming to a stop. Contact was lost on 15 November at 00:36 UTC. The German Aerospace Center's lander manager"
"cold traps near the poles. NASA's Lunar Reconnaissance Orbiter (LRO) took a photograph of the landing site on 25 December 2013 in which the lander and the rover can be seen. LRO also attempted to photograph the lander and rover on 22 January 2014, and on 18 February 2014. The rover was still intermittently transmitting as late as 6 September 2014. As of March 2015, the rover remained immobile and its instruments continued degrading, but was still able to communicate with Earth radio stations. While amateur observers were unable to detect transmissions from the lander, Chinese officials reported that the"
"observe a dozen such objects through 2018. On April 15, 2015, Pluto was imaged showing a possible polar cap. On July 4, 2015, ""New Horizons"" experienced a software anomaly and went into safe mode, preventing the spacecraft from performing scientific observations until engineers could resolve the problem. On July 5, NASA announced that the problem was determined to be a timing flaw in a command sequence used to prepare the spacecraft for its flyby, and the spacecraft would resume scheduled science operations on July 7. The science observations lost because of the anomaly were judged to have no impact on"
"malfunction which made it unable to deploy the solar sail or to communicate. On 31 May 2015, The Planetary Society reported having regained contact with LightSail 1. After the solar panels were deployed on 3 June 2015, communications with the spacecraft were lost once more on 4 June. In this case, a fault with the battery system was suspected. Contact was then reestablished on 6 June, and the sail deployment was initiated on 7 June. At a conference on 10 June 2015, after photos of deployment were downloaded, the test flight was declared a success. The spacecraft reentered the atmosphere"
"of detaching its lander. By 25 August 2014, five potential landing sites had been determined. On 15 September 2014, ESA announced Site J, named ""Agilkia"" in honour of Agilkia Island by an ESA public contest and located on the ""head"" of the comet, as the lander's destination. ""Philae"" detached from ""Rosetta"" on 12 November 2014 at 08:35 UTC, and approached 67P at a relative speed of about . It initially landed on 67P at 15:33 UTC, but bounced twice, coming to rest at 17:33 UTC. Confirmation of contact with 67P reached Earth at 16:03 UTC. On contact with the surface,"
"are attempting to determine the satellite's status, but since the software and hardware type used in the IMAGE Mission Operations Center have been discarded and no longer exist, they are in the process of adapting old software and databases to their modern systems and track down replacement hardware. On 25 February 2018, NASA again lost contact with the satellite, but not in the same manner it did in 2005. Richard Burley, former IMAGE mission director, stated that he believes there is an issue with IMAGE's spin axis in relation to its medium-gain antenna placement. If NASA can regain control of"
"the orbiter. Hence, over several orbits, many different paths will have been obtained. The lander communicated with the ""Rosetta"" orbiter again on 9 July 2015 and transmitted measurement data from the CONSERT instrument. CONSERT CONSERT (COmet Nucleus Sounding Experiment by Radiowave Transmission) is a scientific experiment on board the European Space Agency's Rosetta mission, launched in 2004, which will provide information about the deep interior of the comet 67P/Churyumov-Gerasimenko upon the probe's rendezvous with the comet in 2014. The CONSERT radar will perform tomography of the nucleus by measuring electromagnetic wave propagation from the Philae lander and the Rosetta orbiter"
"flight controllers. After the successful repair of the Mobile Transporter, the ISS crew was resupplied on December 23, 2015 by the Progress 62 spacecraft. On January 15, 2016, Kopra and Peake performed another EVA and successfully replaced a voltage regulator, but were forced to return early after water began forming inside of Kopra's helmet. On January 8, 2016, Kelly appeared in the thank you note segment of ""The Tonight Show Starring Jimmy Fallon"", with the first ever thank you note from space. Russian cosmonauts Malenchenko and Volkov conducted an EVA on February 3, 2016, to retrieve experiments and photograph the"
"has been proven. Five additional controlled-descent tests were conducted in the remainder of 2014 through April 2015, including two attempts to land on a floating landing platform—a SpaceX-built Autonomous Spaceport Drone Ship—on the Atlantic Ocean east of the launch site, both of which brought the vehicle to the landing platform, but neither of which resulted in a successful landing. During the 2015 launch hiatus, SpaceX requested regulatory approval from the FAA to attempt returning their next flight to Cape Canaveral instead of targeting a floating platform in the ocean. The goal was to land the booster vertically at the leased"
"and an inclination of 0.1 degree. In 1999, NASA made brief contact with ICE to verify its carrier signal. On September 18, 2008, NASA, with the help of KinetX, located ICE using the NASA Deep Space Network after discovering that it had not been powered off after the 1999 contact. A status check revealed that all but one of its 13 experiments were still functioning, and it still had enough propellant for of Δv. It was determined to be possible to reactivate the spacecraft in 2014, when it again made a close approach to Earth, and scientists discussed reusing the"
"the ESA lander Philae. K band TT&C (telemetry, tracking and control) Experiment. The experiment weighed 6.2 kg and had a power consumption of 26 watts. SMART-1 was launched September 27, 2003 together with Insat 3E and eBird 1, by an Ariane 5 rocket from the Guiana Space Centre in French Guiana. After 42 minutes it was released into a geostationary transfer orbit of 7,035 × 42,223 km. From there it used its Solar Electric Primary Propulsion (SEPP) to gradually spiral out during thirteen months. The orbit can be seen up to October 26, 2004 at spaceref.com, when the orbit was"
"still operational. A final orbit-lowering burn was performed in early December 2005 to prepare the satellite for deorbit. On 26 October 2010, the International Space Station performed a debris-avoidance maneuver in response to a conjunction with UARS. The decommissioned satellite re-entered Earth's atmosphere on 24 September 2011. Considerable media attention surrounded the event, largely due to NASA's predictions that substantial parts of the satellite might reach the ground, potentially endangering inhabited areas. However, the satellite ultimately impacted in a remote area of the Pacific Ocean. CLAES was a spectrometer that determined the concentrations and distributions of nitrogen and chlorine compounds,"
"propellant on TRMM running low, NASA decided to cease station-keeping maneuvers and allow the spacecraft's orbit to slowly decay, while continuing to collect data. The remaining fuel, initially reserved to avoid collisions with other satellites or space debris, was depleted in early March 2015. Re-entry was originally expected sometime between May 2016 and November 2017, but occurred sooner due to heightened solar activity. The probe's primary sensor, the precipitation radar, was switched off for the final time April 1, 2015 and the final scientific sensor, LIS, was turned off on April 8, 2015. Re-entry occurred on June 16, 2015 at"
"search of the sea-floor near the detections was carried out between 14 April and 28 May without any sign of Flight 370. In a March 2015 report, it was revealed that the calendar life of the battery for the ULB attached to Flight 370's flight data recorder had expired in December 2012 and may not have been as capable. In late June 2014, details of the next phase of the search were announced; officials have called this phase the ""underwater search"", despite the previous seafloor sonar survey. Continued refinement of the analysis of Flight 370's satellite communications identified a ""wide"
"of the lander: pictures show that the probe landed safely and started its operations, deploying some of the solar panels; then an on-ground failure occurred preventing the full deployment of all panels; this prevented the onboard antenna, hidden under last solar panel, from gaining visibility to any orbiter, making it impossible for the lander any form of communication, thus leading to mission loss. The location of ""Beagle 2"" on Mars was unknown from late 2003 to early 2015. On 16 January 2015, more than eleven years after its loss and eight months after its pioneer Colin Pillinger died, news sources"
"attempts to contact the lander failed. Communications attempts continued throughout January, but ""Beagle 2"" was declared lost in mid-February, and a joint inquiry was launched by the UK and ESA that blamed principal investigator Colin Pillinger's poor project management. Nevertheless, Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole. NASA had previously confirmed their presence at the north pole of Mars. Signs of the ""Beagle 2"" lander were found in 2013 by the HiRISE camera on NASA’s Mars Reconnaissance Orbiter and the ""Beagle 2""s presence confirmed in January 2015, several months"