science

Quadrantids

Quadrantids 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 Quadrantids rather than just read about it. In short: The Quadrantids (QUA) are a meteor shower that peaks in early January and whose radiant lies in the constellation Boötes. The zenithal hourly rate (ZHR) of this shower can be as high as that of two other reliably rich meteor showers, the Perseids in August and the Geminids in December, yet Quadrantid meteors are not seen as often as those of the two other showers because the time frame of the peak is exceedingly nar…

Key takeaways

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

Reference excerpt

The Quadrantids (QUA) are a meteor shower that peaks in early January and whose radiant lies in the constellation Boötes. The zenithal hourly rate (ZHR) of this shower can be as high as that of two other reliably rich meteor showers, the Perseids in August and the Geminids in December, yet Quadrantid meteors are not seen as often as those of the two other showers because the time frame of the peak is exceedingly narrow, sometimes lasting only hours. Moreover, the meteors are quite faint, with mean apparent magnitudes between 3.0 and 6.0.

Observations and associations The meteor rates exceed one-half of their highest value for only about eight hours (compared to two days for the August Perseids), which means that the stream of particles that produces this shower is narrow, and apparently deriving within the last 500 years from some orbiting body. The parent body of the Quadrantids was tentatively identified in 2003 by Peter Jenniskens as the minor planet 2003 EH1, which in turn may be related to the comet C/1490 Y1 that was observed by Chinese, Japanese and Korean astronomers some 500 years ago.

The radiant point of this shower is at the northern edge of the constellation Boötes, not far from the Big Dipper. It lies between the end of the handle of the Big Dipper and the quadrilateral of stars marking the head of the constellation Draco. This meteor shower is best seen in the northern hemisphere, but it can be seen partly to 50 degrees south latitude. The name comes from Quadrans Muralis, a former constellation created in 1795 by the French astronomer Jérôme Lalande that included portions of Boötes and Draco. In early January 1825, Antonio Brucalassi in Italy reported that “the atmosphere was traversed by a multitude of the luminous bodies known by the name of falling stars.” They appeared to radiate from Quadrans Muralis. In 1839, Adolphe Quetelet of Brussels Observatory in Belgium and Edward C. Herrick in Connecticut independently made the suggestion that the Quadrantids are an annual shower. In 1922, the International Astronomical Union (IAU) devised a list of 88 modern constellations. The list was agreed upon by the IAU at its inaugural general assembly held in Rome in May 1922. It did not include a constellation Quadrans Muralis. The IAU officially adopted this list in 1930, but this meteor shower still retains the name Quadrantids, for the original and now-obsolete constellation.

See also (196256) 2003 EH1 Qingyang event List of meteor showers Meteor showers

References

External links Quadrantids Create Year's First Meteor Shower Archived 2020-07-17 at the Wayback Machine (NASA 01.02.12) International Meteor Organization 2010 Meteor Shower Calendar NASA Quadrantid Airborne Campaign

Illustrations

Worked examples

Example 1 — a first encounter with Quadrantids

Start with the simplest possible case. Write down what Quadrantids 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 Quadrantids 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 Quadrantids 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 Quadrantids

In research: Quadrantids 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 Quadrantids 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: Quadrantids is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1830s in science, Boötes, December, so understanding it makes those chapters shorter.
In everyday life: Look for Quadrantids 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Quadrantids in 20 minutes

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

Frequently asked questions

What is Quadrantids in simple terms?

Why does Quadrantids 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 Quadrantids?

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 Quadrantids.