astronomy

HD 110067

HD 110067 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 HD 110067 rather than just read about it. In short: HD 110067 is a K-type main-sequence star with six known sub-Neptune exoplanets (b, c, d, e, f, g) with radii ranging from 1.94 R🜨 to 2.85 R🜨. The planets orbit the host star in a rhythmic orbital resonance.

Key takeaways

HD 110067 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HD 110067 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 110067 from memory before moving on to harder problems.

Reference excerpt

HD 110067 is a K-type main-sequence star with six known sub-Neptune exoplanets (b, c, d, e, f, g) with radii ranging from 1.94 R🜨 to 2.85 R🜨. The planets orbit the host star in a rhythmic orbital resonance. The star, and related planetary system, is located 105 light-years away in the constellation Coma Berenices. HD 110067 is part of a wide triple star system, along with the spectroscopic binary system HD 110106.

Description HD 110067, located 105 light-years away in the constellation Coma Berenices, is orbited by six known sub-Neptune exoplanets (b, c, d, e, f, g) with radii ranging from 1.94 R🜨 to 2.85 R🜨, and with densities (and solid cores) similar to that of gas giants in the Solar System. None of the planets in the planetary system were found to be in the habitable zone for life as we know it.

Discovery The two innermost exoplanets orbiting HD 110067, a bright star, were first detected by the TESS (NASA) space telescope, using the transit method, in 2020. The remaining four exoplanets were later confirmed in 2023 as a result of additional observations using the CHEOPS (European Space Agency) space telescope.

Scientific importance On 29 November 2023, an international team of astronomers, led by Rafael Luque, astronomer from the University of Chicago, published a review of the discovery in the journal Nature entitled, "A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067". According to Luque, "It’s like looking at a fossil: The orbits of the planets today are the same as they were a billion years ago." Further study of the HD 110067 planetary system may provide a better understanding of how the pattern of the planetary orbits in the Solar System arose, which once may have begun harmoniously, but later turned chaotic. The result, possibly, of a passing star or planet or some other astronomical object capable of disrupting the nascent harmonic orbital dynamics. Additionally, further studies of the system, including compositional studies of the planetary interiors and atmospheres, may also provide a better understanding of the conditions that potentially may support life.

Planetary system Six known sub-Neptune exoplanets (b, c, d, e, f, g) with planetary radii ranging from 1.94 R🜨 to 2.85 R🜨 from HD 110067, the host star. All planets are smaller than Neptune and have substantial atmospheres. The star and related planetary system are located 105 light years away, in the constellation Coma Berenices. Masses of all six of the planets in the system range from 3.9 M🜨 to 8.5 M🜨. All of the planetary orbits in the HD 110067 system are closer to their star than distance between the planet Mercury and the Sun. The planets orbit the host star in synchronized rhythms of orbital resonance (a rare 1 percent of such systems in the Milky Way galaxy have this symmetry): the innermost planet orbits three times for every two times for the next planet out – a so-called 3:2 resonance; this same 3:2 resonance also applies to the second and third planet, as well as to the third and fourth planet; whereas the fourth planet orbits four times for every three times for the fifth planet out – in a so-called 4:3 resonance; additionally, the penultimate fifth planet orbits the sixth planet out in this same 4:3 resonance. Further, the innermost planet completes six orbits in exactly the same time the outermost planet completes one orbit. The resonance ratio for the entire system is 54:36:24:16:12:9.

Worked examples

Example 1 — a first encounter with HD 110067

Start with the simplest possible case. Write down what HD 110067 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 HD 110067 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 HD 110067 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 HD 110067

In research: HD 110067 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 HD 110067 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: HD 110067 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2023 in outer space, Coma Berenices, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 110067 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 HD 110067 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 110067 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 HD 110067 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 110067 in simple terms?

Why does HD 110067 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 HD 110067?

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 HD 110067.