science

Hygiea family

Hygiea family is a science 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 Hygiea family rather than just read about it. In short: The Hygiea or Hygiean family is a grouping of dark, carbonaceous C-type and B-type asteroids in outer asteroid belt, the largest member of which is 10 Hygiea. Characteristics By far the largest member is 10 Hygiea, a 400 km diameter C-type asteroid that is the fourth largest in the belt..

Key takeaways

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

Reference excerpt

The Hygiea or Hygiean family is a grouping of dark, carbonaceous C-type and B-type asteroids in outer asteroid belt, the largest member of which is 10 Hygiea.

Characteristics

By far the largest member is 10 Hygiea, a 400 km diameter C-type asteroid that is the fourth largest in the belt.. The remaining members are much smaller so Hygiea contains about 94–98% of the mass in the family (depending on the exact criteria for inclusion). The two next largest members are 333 Badenia, and 538 Friederike, both just over 70 km in diameter. After that, the remaining members have diameters of less than 30 km. The Hygiea family is thought to have arisen from a catastrophically disruptive impact, after which Hygiea re-accumulated. The two 70-kilometer-diameter bodies, which are much larger than, for example, the Vesta family, which contains no members above around 10 km in diameter, are consistent with this scenario. The family contains a significant number of objects of the otherwise rare B spectral type (Mothé-Diniz 2001). The largest of these is the previously mentioned 538 Friederike.

Location and size A numerical analysis by Zappala and colleagues found a 'core' group of family members, whose proper orbital elements lie in the approximate ranges

At the present epoch, the range of osculating orbital elements of these core members is

The 1995 analysis by Zappalà found 103 core members, whereas a search of a recent proper element database (AstDys)for 96944 minor planets in 2005 yielded 1043 objects lying within the rectangular-shaped region defined by the first table above. This would give about 1% of all asteroids in the asteroid belt.

Interlopers This family contains quite a large number of identified interlopers. The following were identified in a spectral survey published in 2001, and also by inspection of the PDS asteroid taxonomy data set for S- and D-type members: 100 Hekate, 108 Hecuba, 1109 Tata, 1209 Pumma, and 1599 Giomus. In fact, some of the other asteroids of the C spectral type are probably interlopers as well, due to the prevalence of this spectral type in the region. Possible candidates include 333 Badenia and 538 Friederike, based on their unusually large size for cratering family members. 52 Europa, a very large 300 km diameter asteroid, orbits nearby with a proper inclination of 6.37°, and was sometimes considered part of the Hygiea family in the past, but it is an unrelated asteroid. A better sampling of asteroids in the area in recent years has clearly shown that it orbits well beyond the Hygiea family clump.

References

AstDys site. Proper elements for 96944 numbered minor planets.

Worked examples

Example 1 — a first encounter with Hygiea family

Start with the simplest possible case. Write down what Hygiea family claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Hygiea family 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 Hygiea family 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 Hygiea family

In research: Hygiea family appears in science 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 Hygiea family 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: Hygiea family is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asteroid groups and families, Hygiea asteroids, so understanding it makes those chapters shorter.
In everyday life: Look for Hygiea family 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 Hygiea family in 20 minutes

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

Frequently asked questions

What is Hygiea family in simple terms?

The Hygiea or Hygiean family is a grouping of dark, carbonaceous C-type and B-type asteroids in outer asteroid belt, the largest member of which is 10 Hygiea. Characteristics By far the largest member is 10 Hygiea, a 400 km diameter C-type asteroid that is the fourth largest in the belt..

Why does Hygiea family matter?

Because it connects several science 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 Hygiea family?

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 Hygiea family.