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| ESA at Venus! |
| At 07:17 UT (09:17 CEST) on 11 April 2006, the Venus Express spacecraft fired its main engine to enter orbit around Earth's sister planet, making ESA the first space agency to have vehicles orbiting the Moon, Mars and Venus at the same time. With this latest success, the Agency hasadded another celestial body to its range of targets in the Solar System. ESA is operating Mars Express around Mars and SMART-1 around the Moon, and is a partner on the Cassini orbiter circling Saturn. ESA also has the Rosetta spacecraft en route to Comet 67P/Churyumov-Gerasimenko. |
| Publication date: 15 May 2006 |
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| ESA Bulletin 124 - Venus Express Launched |
| This issue of the ESA Bulletin takes an in-depth look at the Venus Express mission. The successful launch, the mission, the spacecraft, the science return, as well as the ground segment and mission operations are featured.
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| Publication date: 15 Nov 2005 |
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| The Role of Different Parameters in the Pressurant Budget of Venus Express and its Dynamic Evolution during the Mission |
| In proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555), 2-9 June, 2004, Chia Laguna (Cagliari), Sardinia, Italy. Editor: A.Wilson. Published on CDROM., p.115.1
An insufficient amount of pressurant gas in the propulsion system or a working temperature in the pressurant tank outside the qualification limits can cause a decrease in the performance of the thrusters or even the loss of the mission. This paper presents an engineering tool used able to compute the Pressurant budget of a mission and the effects of influencing parameters. The updated tool allows to also compute the temperature, pressure and mass evolution inside the pressurant tank during the various mission phases. The tool has been used to verify the calculations done by Astrium Stevenage for Mars Express and Venus Express. The pressurant gas used for both cases was helium. The tool permits to use other combinations of pressurant gases and propellants for different propellant systems (monopropellant and bipropellant systems). |
| Publication date: 15 Oct 2004 |
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| Venus Express Chemical Propulsion System - The Mars Express Legacy |
| In proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sardinia, Italy. Editor: A.Wilson. Published on CDROM., p.88.1 ESA's ambition of inter-planetary exploration using a fast-track low cost industrial programme was well achieved with Mars Express. Reusing the platform architecture for the service module and specifically the Propulsion system enabled Venus Express to benefit from several lessons learnt from the Mars Express experience. Using all existing components qualified for previous programmes, many of them commercial telecommunication spacecraft programmes with components available from stock, an industrial organisation familiar from Mars Express was able to compress the schedule to make the November 2005 launch window a realistic target. While initial inspection of the CPS schematic indicates a modified Eurostar type architecture, - a similar system using some Eurostar components - would be a fairer description. The use of many parts of the system on arrival at the destination (Mars or Venus in this case) is a departure from the usual mode of operation, where many components are used during the initial few weeks of GTO or GEO. The system modifications over the basic Eurostar system have catered for this in terms of reliability contingencies by replacing components, or providing different levels of test capability or isolation in flight. This paper aims to provide an introduction to the system, address the evolution from Eurostar, and provide an initial assessment of the success of these modifications using the Mars Express experience, and how measures have been adopted specifically for Venus Express. |
| Publication date: 15 Oct 2004 |
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| Venus Express on the Right Track |
A paper originally presented by EADS Astrium at the 55th IAC in Vancouver in October 2004.
On October 26th of next year, Venus Express spacecraft will depart from Baikonur on-board the Soyuz/Fregat Launch Vehicle. It will be the very first European mission to the "morning star", two years after the first European trip to Mars. Venus Express will carry 7 science payloads dedicated to global investigation of the Venusian atmosphere. |
| Publication date: 04 Oct 2004 |
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| Compact high-resolution echelle-AOTF NIR spectrometer for atmospheric measurements |
| In: Proceedings of the 5th International Conference on Space Optics (ICSO 2004), Toulouse, France. Ed.: B. Warmbein. ESA SP-554, Noordwijk, Netherlands: ESA Publications Division, ISBN 92-9092-865-4 A new concept of a high-resolution near-IR spectrometer consisting of an echelle grating combined with an acousto-optic tunable filter (AOTF) for separation of diffraction orders, is developed for space-borne studies of planetary atmospheres. A compact design with no moving parts within the mass budget of 3-5 kg allows to reach the resolving power 20 000-30 000. Only a small piece of spectrum in high diffraction orders can be measured at a time, but thanks to flexibility of the AOTF electrical tuning, such pieces of spectrum can be measured randomly and rapidly within the spectral range. This development can be used for accurate measurements of important atmospheric gases, such as CO2 in terrestrial atmosphere, isotopic ratios and minor gases. A spectrometer, based on this principle, SOIR (Solar Occultation InfraRed) is being built for Venus Express (2005) ESA mission. Instruments based on this principle have high potential for the studies of the Earth, in particular for measurements of isotopes of water in the lower atmosphere, either in solar occultation profiling (tangent altitude <10 km), or observing solar glint for integral quantities of the components. Small size of hardware makes them ideal for micro-satellites, which are now agile enough to provide necessary pointing for solar occultation or glint observations. Also, the atmosphere of Mars has never been observed at local scales with such a high spectral resolution. A laboratory prototype consisting of 275-mm echelle spectrometer with Hamamatsu InGaAs 512-pixel linear array and the AOTF has demonstrated a resolving power of 30 000 in the spectral range of 1-1.7 µm. The next set up, covering the spectral ranges of 1-1.7 µm and 2.3-4.3 µm, and the Venus Express SOIR are briefly discussed. |
| Publication date: 15 Jun 2004 |
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| ESA SP-1276: ESA's Report to the 35th COSPAR Meeting |
Scientific editor: A. Gimenez Editor: A. Wilson
The report for the 35th COSPAR Meeting covers, as in previous issues, the missions
of the Scientific Programme of ESA in the areas of astronomy, Solar System
exploration and fundamental physics. This year's COSPAR Meeting occurs only
weeks after the Saturn-orbit insertion of the Cassini spacecraft - carrying Europe's
Huygens probe to explore the atmosphere of Titan - and at the same time as the
launch of the second satellite of the Double Star project. |
| Publication date: 15 Jun 2004 |
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| Venus Express - First European Mission to Venus |
A paper originally presented by EADS Astrium at the 54th IAC in Bremen in September 2003.
On 28 January 2003, EADS Astrium officially
signed the Venus Express contract with the
European Space Agency (ESA) worth 82.4 million
Euros for the design and development of the
spacecraft. This will be the first European spacecraft
to visit the planet Venus. Venus Express is
scheduled for launch from the Baikonour
Cosmodrome in Kazakhstan in November 2005. It
will be launched by a Soyuz-Fregat rocket and put
immediately into its transfer orbit to Venus. |
| Publication date: 01 Sep 2003 |
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| ESA SP-1259: ESA's Report to the 34th COSPAR Meeting |
Scientific editor: B. Foing Editor: A. Wilson
The report to the 34th COSPAR Meeting covers the missions of the Scientific Programme of ESA in the areas of astronomy, Solar System exploration and fundamental physics. |
| Publication date: 01 Oct 2002 |
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| Sulfur dioxide at the Venus cloud tops, 1978-1986 |
| Ultraviolet spectroscopy from the Pioneer Venus Orbiter shows a decline in the cloud top abundance of SO2 from about 100 ppb to about 10 ppb in the period 1978-1986. A consistent decline in polar haze has occurred over the same period, with the correlation coefficient between these two observables of r = 0.8. Star calibrations determine the instrument sensitivity to within 10%, which rules out the possibility that this is an instrumental effect. Systematic errors could increase the SO2 abundance to twice the inferred values in later orbits. Tracking of SO2 features and power spectral analysis give rotation periods for the longer-lived features of 3.6-5.2 days, consistent with cloud-tracked winds observed at other wavelengths. The behavior of SO2 and polar haze can be plausibly explained by episodic injection of SO2 into the cloud top regions, for example, by active volcanism. |
| Publication date: 20 May 1988 |
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