astronomy

TOI-375 d

TOI-375 d 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 TOI-375 d rather than just read about it. In short: TOI-375 d is a gas giant exoplanet orbiting the evolved K-type star TOI-375, located approximately 396 parsecs (about 1,290 light-years) from Earth. The planet was discovered in 2026 using the radial velocity method during follow-up observations of the TOI-375 planetary system.

Key takeaways

TOI-375 d belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TOI-375 d to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TOI-375 d from memory before moving on to harder problems.

Reference excerpt

TOI-375 d is a gas giant exoplanet orbiting the evolved K-type star TOI-375, located approximately 396 parsecs (about 1,290 light-years) from Earth. The planet was discovered in 2026 using the radial velocity method during follow-up observations of the TOI-375 planetary system. The planet is the outermost known member of the TOI-375 planetary system, which contains at least three confirmed giant planets.

Discovery The TOI-375 system was initially investigated after the discovery of the transiting hot Jupiter TOI-375 b by NASA's Transiting Exoplanet Survey Satellite (TESS). Subsequent spectroscopic observations revealed additional radial velocity signals indicating the presence of two outer giant planets, designated TOI-375 c and TOI-375 d. The discovery paper describing the system was published in Monthly Notices of the Royal Astronomical Society in 2026.

Host star TOI-375 d orbits the evolved K-type star TOI-375. The host star has a mass greater than that of the Sun and is believed to be evolving away from the main sequence.

Characteristics TOI-375 d is classified as a gas giant planet with a minimum mass approximately 1.4 times that of Jupiter. Since the planet does not transit its host star from the perspective of Earth, its radius and true mass remain uncertain. The planet orbits its host star at a distance similar to that between the Earth and the Sun, completing one orbit every 297.9 days. The equilibrium temperature of the planet is estimated to be approximately 434 K due to radiation from its evolved host star.

Planetary system TOI-375 d is part of a multi-planet system containing at least three known planets. The TOI-375 system's multiple giant planets orbiting an evolved star make it important for studies of planetary formation and migration.

See also Exoplanet Gas giant Hot Jupiter Radial velocity List of exoplanets discovered in 2026 Transiting Exoplanet Survey Satellite

References

External links TOI-375 d at NASA Science TOI-375 system at the NASA Exoplanet Archive TOI-375 d at The Extrasolar Planets Encyclopaedia

Worked examples

Example 1 — a first encounter with TOI-375 d

Start with the simplest possible case. Write down what TOI-375 d 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 TOI-375 d 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 TOI-375 d 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 TOI-375 d

In research: TOI-375 d 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 TOI-375 d 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: TOI-375 d is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanets detected by radial velocity, Exoplanets discovered in 2026, Gas giants, so understanding it makes those chapters shorter.
In everyday life: Look for TOI-375 d 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 TOI-375 d in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TOI-375 d 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 TOI-375 d out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TOI-375 d in simple terms?

Why does TOI-375 d 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 TOI-375 d?

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 TOI-375 d.