astronomy

Lem (satellite)

Lem (satellite) 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 Lem (satellite) rather than just read about it. In short: Lem (also called BRITE-PL) is the first Polish governmental artificial satellite. It was launched in November 2013 as part of the Bright-star Target Explorer (BRITE) programme.

Key takeaways

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

Reference excerpt

Lem (also called BRITE-PL) is the first Polish governmental artificial satellite. It was launched in November 2013 as part of the Bright-star Target Explorer (BRITE) programme. The spacecraft was launched aboard a Dnepr rocket. Named after the Polish science fiction writer Stanisław Lem, it is an optical astronomy spacecraft built by the Space Research Centre of the Polish Academy of Sciences and operated by Centrum Astronomiczne im. Mikołaja Kopernika PAN; one of two Polish contributions to the BRITE constellation along with the Heweliusz satellite.

Features Lem is the first Polish scientific satellite, and the second (after PW-Sat) ever launched. Along with Heweliusz, TUGSAT-1, UniBRITE-1 and BRITE-Toronto, it is one from a constellation of six nanosatellites of the BRIght-star Target Explorer project, operated by a consortium of universities from Canada, Austria and Poland. Lem was developed and manufactured by the Space Research Centre of the Polish Academy of Sciences in 2011, based around the Generic Nanosatellite Bus, and had a mass at launch of 7 kilograms or 15 pounds (plus another 7 kg for the XPOD separation system). The satellite is used, along with four other operating spacecraft, to conduct photometric observations of stars with an apparent magnitude brighter than 4.0 as seen from Earth. Lem was one of two Polish BRITE satellites launched, along with the Heweliusz spacecraft. Four more satellites—two Austrian and two Canadian—were launched at different dates.

Mission Lem observes the stars in the blue color range, whereas Heweliusz does it in red. Due to the multicolour option, geometrical and thermal effects in the analysis of the observed phenomena are separated. None of the much larger satellites, such as MOST and CoRoT, has this colour option; this is crucial in the diagnosis of the internal structure of stars. Lem photometrically measures low-level oscillations and temperature variations in stars brighter than visual magnitude (4.0), with unprecedented precision and temporal coverage not achievable through terrestrial based methods.

Launch The Lem satellite was launched from the Russian Yasny air base aboard a Dnepr through the BRITE-PL Project satellite launch programme established in 2009 by the Space Research Centre of the Polish Academy of Sciences and The Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences in cooperation with University of Toronto. The launch was subcontracted to the Russian Ministry of Defence which launched the satellites using Dnepr rocket from the Yasny air base along with 33 other satellites. The launch took place at 07:10 (UTC) on 21 November 2013, and the rocket deployed all of its payloads successfully.

Illustrations

Worked examples

Example 1 — a first encounter with Lem (satellite)

Start with the simplest possible case. Write down what Lem (satellite) 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 Lem (satellite) 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 Lem (satellite) 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 Lem (satellite)

In research: Lem (satellite) 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 Lem (satellite) 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: Lem (satellite) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2013 in Poland, Commemoration of Stanisław Lem, Satellites of Poland, so understanding it makes those chapters shorter.
In everyday life: Look for Lem (satellite) 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 Lem (satellite) in 20 minutes

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

Frequently asked questions

What is Lem (satellite) in simple terms?

Lem (also called BRITE-PL) is the first Polish governmental artificial satellite. It was launched in November 2013 as part of the Bright-star Target Explorer (BRITE) programme.

Why does Lem (satellite) 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 Lem (satellite)?

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 Lem (satellite).