astronomy

UScoCTIO 108

UScoCTIO 108 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 UScoCTIO 108 rather than just read about it. In short: UScoCTIO 108 is a binary system, approximately 470 light-years away from Earth, in the Upper Scorpius (USco) OB association. The primary star, UScoCTIO 108A, is with a mass of around 0.06 solar masses, is a brown dwarf or low-mass red dwarf.

Key takeaways

UScoCTIO 108 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UScoCTIO 108 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UScoCTIO 108 from memory before moving on to harder problems.

Reference excerpt

UScoCTIO 108 is a binary system, approximately 470 light-years away from Earth, in the Upper Scorpius (USco) OB association. The primary star, UScoCTIO 108A, is with a mass of around 0.06 solar masses, is a brown dwarf or low-mass red dwarf. The secondary star, UScoCTIO 108B, with a mass of around the deuterium burning limit of 13 Jupiter masses, can be classified as either a brown dwarf or an extrasolar planet. The primary component of the system was discovered in the year 2000 as a possible member of the Upper Scorpius association, based on its position in an HR diagram. It was observed in a search for new members of the association by the Cerro Tololo Inter-American Observatory (CTIO), where it received the designation UScoCTIO 108. Later, spectroscopic and photometric observations confirmed that the object is a real member of the association, showing signs of low gravity and youth, and estimated a mass of 60 times the mass of Jupiter (MJ), an effective temperature of 2,800 K and a spectral type of M7. The low mass indicates that the object is not able to sustain hydrogen fusion, making it a brown dwarf. The secondary member of the system was found in 2008 as an object located at a separation of 4.6 arcseconds, which corresponds to a physical separation of more than 670 AU, and is also a confirmed member of the Upper Scorpius association. Its spectrum shows it is also a cold substellar object, with an effective temperature of 2,300K and a spectral type of M 9.5. Its mass was originally estimated at 14 MJ, very close to the nominal boundary between planets and brown dwarf, but a recent revision of the age of the Upper Scorpius association to 11 million years increased this value to 16 MJ, indicating that the object is likely a low mass brown dwarf. The physical association between the two brown dwarfs has not been confirmed by observation of common proper motion, but is considered very likely given the proximity between them. The minimum separation between the two brown dwarfs, 670 AU, is much larger than the mean of other similar mass systems, and indicates that the pair (if they really form a binary system) is very weakly bound, with an escape velocity of 0.4 km/s for the secondary component. Considering the average stellar density in an association like Upper Scorpius, it is estimated that perturbations by passing stars will cause the rupture of the system in a few million years. Observations by the infrared telescope WISE revealed excess emission at 12 and 22 μm, indicating the presence of a debris disk around the brown dwarf.

See also SDSS J1416+1348 2M1101AB Oph 162225-240515 Binary brown dwarfs

References

External links Star: UScoCTIO 108, Extrasolar Planets Encyclopaedia. Accessed on line June 17, 2008.

Illustrations

Worked examples

Example 1 — a first encounter with UScoCTIO 108

Start with the simplest possible case. Write down what UScoCTIO 108 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 UScoCTIO 108 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 UScoCTIO 108 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 UScoCTIO 108

In research: UScoCTIO 108 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 UScoCTIO 108 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: UScoCTIO 108 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brown dwarfs, M-type main-sequence stars, Scorpius, so understanding it makes those chapters shorter.
In everyday life: Look for UScoCTIO 108 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 UScoCTIO 108 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UScoCTIO 108 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 UScoCTIO 108 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UScoCTIO 108 in simple terms?

Why does UScoCTIO 108 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 UScoCTIO 108?

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 UScoCTIO 108.