The numbers provided here are based on a launch
The mission was initially known as XMM after its X-ray Multi-Mirror design, and was formally called the High Throughput X-ray Spectroscopy Mission because of its great capacity to detect X-rays. Artist's impression of the XMM-Newton spacecraft over the Earth. location of the apogee telemetry gap is presented in Fig. XMM-Newton studies some of the most violent space phenomena. XMM will then have a few days of relative calm whilst the ESOC teams enjoy a well-deserved Xmas and New Year holiday. The spacecraft is behaving perfectly. The Launch and Early Operations Phase of the mission will be over. Certainly very fast in human terms, but when it returns at its perigee passage, it whizzes past Earth nine times faster! This gap is caused by a gap in ground station contact. ABOUT XMM-Newton. which splits each orbit into two visibility periods of up to ca. After just 29 minutes, XMM-Newton was released from the upper stage of the vehicle at a height of 2,350km. For example, on this apogee passage, five stars are represented. orbit, with an apogee of about 114,000 km and a perigee of ca. and the argument of perigee The atmosphere is calm in the Darmstadt control centre. The first boosts raised the perigee to 4900 km. Since first acquisition of the spacecraft telemetry, XMM is being gradually manoeuvred to reach its definitive operational orbit. They each contain 58 high-precision concentric mirrors, nested to offer the largest collecting area possible to catch X-rays. All four thrusters work at the same time, providing not only the increase in velocity but also maintaining XMM's orientation. The thruster firings last quite long.
78). the right On each orbit, after the satellite passed through the Earth's radiation belts, astronomers had the observatory at their disposal for some 40 hours. After launch, XMM had been released by Ariane 5 at 826 km. By Thursday 16 December, after fine tuning the apogee on orbit 4, the spacecraft will have been placed in its operational orbit. Each time the spacecraft's velocity is increased, for example by 87 m/sec on the longest burn. For each perigee boost, one set is activated, the other remain as a backup. XMM-Newton is actually a fully-functioning observatory, carrying three very advanced X-ray telescopes. It is the 42nd mission to be handled by ESOC since 1968.
Brightly coloured schematics and graphs are displayed on the consoles of the Flight Operations Director, and those of the XMM Project team representatives. Next: XMM observing constraints Up: Observing with XMM Previous: Observing with XMM XMM orbit XMM will be launched by an Ariane 5 launcher into an highly elliptical orbit, with an apogee of about 114,000 km and a perigee of ca. Three perigee boosts (the first in two parts) are required to raise XMM's perigee to the nominal 7000 km of its operational orbit. XMM … More details are provided in § 4.2.2 (see also ascension of ascending node is Such an orbit provides the best visibility in the southern
The large display screens on the wall indicate the precise distance, 113 850 km. 79.
The XMM satellite is now in the safe hands of the ESOC control teams. Copyright 2000 - 2020 © European Space Agency. celestial hemisphere. This additional speed elongates the orbit so that at its closest point to Earth, XMM will pass at a higher altitude. For instance 276kg were used on the first orbit burns. The orbital inclination is , with two ground stations, located at Perth and Kourou. XMM has eight main thrusters in two redundant sets. During these manoeuvres, the greater part of XMM's 530 kg of hydrazine will be consumed. A minute later, the communications signal of XMM was received. 7000 km XMM-Newton is an X-ray satellite launched into Earth orbit on December 10, 1999 by the European Space Agency (ESA). A planisphere indicates where the satellite's position in space relative to Earth and the visibility for each ground station.
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