VENμS

Key takeaways

VENμS belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect VENμS to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of VENμS from memory before moving on to harder problems.

Reference excerpt

Vegetation and Environment monitoring on a New Micro-Satellite (VENμS) is a near polar Sun-synchronous orbit microsatellite. It is a joint project of the Israeli Space Agency and CNES. The project was started in April 2005 and was launched on 2 August 2017. The microsatellite was designed and built by IAI and Rafael under ISA's supervision at a cost of US$20 million for the ISA and €10 million for CNES. For the mission, CNES is responsible for supplying the superspectral camera and the science mission center. The ISA is responsible for the satellite control center, the technological mission and payload (Israeli Hall effect Thruster and autonomous mission), the spacecraft, and the launcher interface.

History A joint study to check feasibility of the program was done in the first half of 2005. Phase A started in 2005 and upon completion, a memorandum of understanding was signed between the ISA and CNES. The satellite was originally planned to be launched in 2008; however due to changes of the launchers and several delays, the launch date was pushed to 2 August 2017. It was launched via a Vega launcher from Guiana Space Centre together with Italian satellite OPTSAT-3000. After multiple mission extensions, the satellite was retired in August 2024 after expending all of its fuel.

Mission The satellite has a scientific and a technological mission. Scientific mission requirements were defined by Centre d'Etudes Spatiales de la BIOsphère, France, and Ben-Gurion University of the Negev, Israel, and CNES. Technological Mission requirement were defined by Rafael.

Scientific mission The satellite has a 2-day revisit orbit which allows constant viewing angles at constant Sun lighting angles. The unique combination is hoped to allow the development of new image processing methods. A set of at least 50 points of interest around the world were chosen to be scanned throughout the scientific mission. The points will be rescanned every 2 days for the entire duration of the mission where it will collect sensory and imagery data. Some of the objectives from the scientific mission are:

Monitoring and analyzing surface under various environmental and human factors Develop and validate various ecosystem functioning models Improve and validate global carbon cycle models Define theoretical and practical methods for scale transfer Collect and analyze data collected by the low spatial resolution sensors The satellite is equipped with a Super Spectral Camera comprises a catadioptric optical system, a focal plane assembly with narrow band filters, and 4 detector units with 3 separate CCD-TDI array. Each array with separate operational and thermal control. The satellite is also equipped with a Ritchey-Chretien telescope with a focal length of 1.75m and a diameter of 0.25m. The telescope's tube will be covered to protect it from pollution and dust which will deploy once in orbit.

Technological mission

In addition to its scientific mission, the satellite has a technological mission. The satellite is equipped with Israeli hall effect thrusters (IHET). The mission is to demonstrate the thrusters' enhanced capabilities and autonomous mission operations which include:

Orbit maintenance LEO to LEO orbit transfer Enabling imaging mission in a high drag environment - performing the scientific mission at an altitude of 410 km on an Earth repeating sun synchronous orbit The technological mission is designed to use 16 kg of Xenon.

Platform The satellite platform is based on the Israel Aerospace Industries OPSAT 3000 satellite platform. VENμS has a dual propulsion system: hydrazine for orbit insertion and xenon for the technological mission. The satellite's mass is 265 kg (wet), of which 16 kg is Xenon and 7 kg is hydrazine.

Ground control station The satellite is ground controlled by IAI in Israel. The Israeli mission control is linked to two sub-stations in charge of each of the missions; the scientific mission is operated from Toulouse Space Center, France and the technology mission is controlled from the Rafael Technological Mission Center, Haifa, Israel.

See also CNES Israel Space Agency 2014 in spaceflight Israel Aerospace Industries Vega Ritchey–Chrétien telescope

References

External links CNES VENμS Mission Page Building the VENUS satellite, Israel Aerospace Industries, Ministry of Science, Technology and Space \ Israel Space Agency May 2017, on YouTube Meet the VENUS satellite, Ministry of Science, Technology and Space \ Israel Space Agency, January 2017 Jerusalem from space: First images of the satellite VENUS Hebrew , Ynet news, 23 August 2017

Illustrations

Worked examples

Example 1 — a first encounter with VENμS

Start with the simplest possible case. Write down what VENμS claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to VENμS before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about VENμS ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of VENμS

In research: VENμS appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses VENμS in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: VENμS is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2017 in France, 2017 in Israel, CNES satellites, so understanding it makes those chapters shorter.
In everyday life: Look for VENμS outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study VENμS in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what VENμS means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain VENμS out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is VENμS in simple terms?

Vegetation and Environment monitoring on a New Micro-Satellite (VENμS) is a near polar Sun-synchronous orbit microsatellite. It is a joint project of the Israeli Space Agency and CNES.

Why does VENμS matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study VENμS?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on VENμS.