astronomy

Onsala Space Observatory

Onsala Space Observatory is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Onsala Space Observatory rather than just read about it. In short: Onsala Space Observatory (OSO), the Swedish National Facility for Radio Astronomy, provides scientists with equipment to study the Earth and the rest of the Universe. The observatory operates two radio telescopes in Onsala, 45 km south of Gothenburg, and takes part in several international projects.

Key takeaways

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

Reference excerpt

Onsala Space Observatory (OSO), the Swedish National Facility for Radio Astronomy, provides scientists with equipment to study the Earth and the rest of the Universe. The observatory operates two radio telescopes in Onsala, 45 km south of Gothenburg, and takes part in several international projects. Examples of activities:

The 20 and 25 m telescopes in Onsala: Studies of the birth and death of stars, and of molecules in the Milky Way and other galaxies. LOFAR station: The Swedish station in the international radio telescope LOFAR is located at the observatory. VLBI: Telescopes in different countries are linked together for better resolution ("sharper images"). ALMA, e-VLBI, Herschel Space Observatory, SKA: Developing and using new radio astronomical facilities. APEX: Radio telescope in Chile for sub-millimetre waves. Research about everything from planets to the structure of the Universe. Odin: Satellite for studies of, e.g., the Earth's atmosphere and molecular clouds in the Milky Way. Space geodesy: Radio telescopes (VLBI) and satellites (GPS) are used to measure movements in Earth's crust and water vapour in the atmosphere. Receiver development: Laboratories for development of sensitive radio receivers. Event Horizon Telescope: A project to create a large telescope array for observing the immediate environment of the Milky Way's supermassive black hole Sagittarius A*, et.c. Onsala Space Observatory was founded in 1949 by professor Olof Rydbeck. The observatory is hosted by Department of Earth and Space Science at Chalmers University of Technology, and is operated on behalf of the Swedish Research Council.

25-metre telescope The 25.6 m diameter, polar mount decimeter-wave telescope in Onsala is equipped with receivers for frequencies up to 7 GHz. It is used for astronomical VLBI observations. It is also operated as a single dish for studies of molecular clouds in the Galaxy. The telescope was built in 1963.

20-metre telescope

The 20 m diameter millimetre wave telescope in Onsala is equipped with receivers for frequencies up to 116 GHz. It is used for observations of millimetre wave emission from molecules in comets, circumstellar envelopes, and the interstellar medium in the Galaxy and in extragalactic objects. The telescope is enclosed in a radome of diameter 30 m. It is also used for astronomical VLBI observations of star forming regions, radio stars, and active galactic nuclei, and for geodetic VLBI observations to study e.g. crustal dynamics and polar motion. The telescope was built in 1975-76 and upgraded in 1992. It is also used, as part of the European and worldwide networks, for astronomical Very Long Baseline Interferometry (VLBI) observations of star forming regions, radio stars, and active galactic nuclei, and for geodetic VLBI observations to study e.g. crustal dynamics and polar motion.

Receivers The telescope is equipped with the following receivers:

LOFAR station

The Swedish station in the international radio telescope LOFAR is located at Onsala Space Observatory. It was completed in 2011.

Nordic ALMA node The Onsala Space Observatory currently hosts the Nordic ALMA node, which is part of the European ALMA regional centre (ARC). The Nordic ALMA node provides face-to-face support for any astronomer that wants to use the ALMA telescope and primarily supports the Nordic scientific community.

References

External links

Onsala Space Observatory Archived 2015-03-25 at the Wayback Machine – official website Nordic ARC node - Home page

Illustrations

Worked examples

Example 1 — a first encounter with Onsala Space Observatory

Start with the simplest possible case. Write down what Onsala Space Observatory claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Onsala Space Observatory 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 Onsala Space Observatory 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 Onsala Space Observatory

In research: Onsala Space Observatory appears in astronomy 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 Onsala Space Observatory 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: Onsala Space Observatory is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1949 establishments in Sweden, 20th-century establishments in Halland County, Astronomical observatories in Sweden, so understanding it makes those chapters shorter.
In everyday life: Look for Onsala Space Observatory 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.

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How to study Onsala Space Observatory in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Onsala Space Observatory 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 Onsala Space Observatory out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Onsala Space Observatory in simple terms?

Why does Onsala Space Observatory matter?

Because it connects several astronomy 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 Onsala Space Observatory?

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 Onsala Space Observatory.