astronomy

Mu2 Scorpii

Mu2 Scorpii 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 Mu2 Scorpii rather than just read about it. In short: Mu2 Scorpii, also named Pipirima , is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56, which is bright enough to be seen with the naked eye.

Key takeaways

Mu2 Scorpii belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mu2 Scorpii to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mu2 Scorpii from memory before moving on to harder problems.

Reference excerpt

Mu2 Scorpii, also named Pipirima , is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56, which is bright enough to be seen with the naked eye. Its distance from the Sun is about 474 light-years, as determined by parallax measurements. It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association. A super-Jupiter or brown dwarf is known to orbit it, and another is suspected.

Nomenclature μ2 Scorpii (Latinised to Mu2 Scorpii, abbreviated μ2 Sco, Mu2 Sco) is the star's Bayer designation. A traditional Polynesian story is told of a brother and sister who flee their parents into the sky and become stars. In one account, the children become Shaula and Lesath in the tip of the tail of Scorpius, and in another they become Mu2 and Mu1 Scorpii. In the Tahitian version of this story, the brother and sister are named Pipiri and Rehua, and their parents call them Pipiri ma while chasing them into the sky: ma "with, and" is used after names to mean "et al." (In a similar version of the story told in the Cook Islands, they become Omega1 and Omega2 Scorpii). In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN approved the name Pipirima for this star on 5 September 2017 (along with Xamidimura for its partner) and it is now so included in the List of IAU-approved Star Names. In Chinese astronomy, Mu2 Scorpii is identified as the second added star of the Tail asterism (Chinese: 尾宿增二; pinyin: Wěi Xiù zēng èr). It was historically called Shengong (Chinese: 神宮; pinyin: Shéngōng), a name which was later applied to the star cluster NGC 6231, and has been adopted by the IAU Working Group on Star Names for the star HD 153072.

Properties Mu2 Scorpii is a blue-white B-type subgiant star with a stellar classification of B2 IV. It has an estimated diameter of 5.6 solar radii and a mass of 9.1 times the Sun's mass, and shines with 2,385 times the Sun's luminosity. The large mass of this star makes it a supernova progenitor. The outer atmosphere has an effective temperature of 21,700 K. It is some 20 million years old and is spinning with a projected rotational velocity of 58 km/s.

Planetary system Two sub-stellar objects slightly above the deuterium burning limit were found in 2022 by direct imaging around Mu2 Scorpii. The outer one, designated μ2 Scorpii b, is definitely an orbiting planet or brown dwarf, and the inner one is a planetary candidate.

See also List of largest exoplanets - including Mu2 Scorpii b and c

Notes

References

External links The beautiful maidens from the Once, Upon a Reef, on: Facebook, Cook Islands Dance Video's

Illustrations

Worked examples

Example 1 — a first encounter with Mu2 Scorpii

Start with the simplest possible case. Write down what Mu2 Scorpii 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 Mu2 Scorpii 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 Mu2 Scorpii 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 Mu2 Scorpii

In research: Mu2 Scorpii 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 Mu2 Scorpii 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: Mu2 Scorpii is common in secondary-school and first-year university syllabi. It links to neighbouring topics B-type main-sequence stars, Bayer objects, Bright Star Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for Mu2 Scorpii 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 Mu2 Scorpii in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mu2 Scorpii 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 Mu2 Scorpii out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mu2 Scorpii in simple terms?

Mu2 Scorpii, also named Pipirima , is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56, which is bright enough to be seen with the naked eye.

Why does Mu2 Scorpii 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 Mu2 Scorpii?

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 Mu2 Scorpii.