astronomy

HATS-70

HATS-70 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 HATS-70 rather than just read about it. In short: HATS-70 is a single star in the constellation of Canis Major at a distance of approximately 4,350 light-years (1,330 parsecs) from the Sun. The apparent magnitude of the star is +12.23, meaning it is much too faint to be visible to the naked eye.

Key takeaways

HATS-70 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HATS-70 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HATS-70 from memory before moving on to harder problems.

Reference excerpt

HATS-70 is a single star in the constellation of Canis Major at a distance of approximately 4,350 light-years (1,330 parsecs) from the Sun. The apparent magnitude of the star is +12.23, meaning it is much too faint to be visible to the naked eye. The age of the star is about 810 million years and it has one planet in its orbit.

Characteristics HATS-70 is an A-type main-sequence star, with a mass 1.78 times larger than the Sun's mass, 1.88 times the radius, and 12 times the luminosity. It has an effective temperature of 7,930 K (7,660 °C; 13,810 °F). It is a rapidly rotating star with measurable oblateness.

Planetary system In 2018, a group of astronomers working as part of the HATSouth project announced the discovery of a massive planet or brown dwarf around this star, HATS-70b. This object's mass is close to the deuterium fusion limit, and the discovery paper refers to it as a brown dwarf. It is in a close orbit with a period of less than two days, with an obliquity of 13.2°+6.4°−5.9° (or 160.4°+5.4°−5.2°) to the star's equator.

References

Worked examples

Example 1 — a first encounter with HATS-70

Start with the simplest possible case. Write down what HATS-70 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 HATS-70 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 HATS-70 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 HATS-70

In research: HATS-70 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 HATS-70 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: HATS-70 is common in secondary-school and first-year university syllabi. It links to neighbouring topics A-type main-sequence stars, Canis Major, Planetary systems with one confirmed planet, so understanding it makes those chapters shorter.
In everyday life: Look for HATS-70 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 HATS-70 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HATS-70 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 HATS-70 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HATS-70 in simple terms?

Why does HATS-70 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 HATS-70?

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 HATS-70.