astronomy

TOI-5624

TOI-5624 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-5624 rather than just read about it. In short: TOI-5624 (also known as TIC 53498154) is a Sun-like star located in the zodiacal constellation Ursa Major, approximately 331 light-years away from Earth. Four sub-Neptunes, identified via transit photometry, are in orbit around the star, accompanied by an outer companion detected through transit timing variations.

Key takeaways

TOI-5624 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-5624 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TOI-5624 from memory before moving on to harder problems.

Reference excerpt

TOI-5624 (also known as TIC 53498154) is a Sun-like star located in the zodiacal constellation Ursa Major, approximately 331 light-years away from Earth. Four sub-Neptunes, identified via transit photometry, are in orbit around the star, accompanied by an outer companion detected through transit timing variations. The star itself is a late yellow dwarf with a spectral type of G7V, a mass of 0.858 solar masses, a radius of 0.820 solar radii, and a temperature of 5327 K. With this data, the star's luminosity was determined to be 0.486 solar luminosities. The star's metallicity is only 0.023 dex, and its age is estimated to be 5.7 billion years. The star rotates on its axis at a speed of 2 km/s.

Planetary system

In July 2019, the TESS space telescope, during its monitoring of Sector 14, detected periodic transit signals from the star TIC 53498154. The object was assigned the status "TESS Objects of Interest" and designated as TOI-5624. At that time, the first two planet candidates were identified: TOI-5624 b and TOI-5624 c. After processing data from additional sectors 40 and 41 and applying specialized algorithms for detecting faint signals, two more transit candidates with longer orbital periods were discovered: TOI-5624 d and TOI-5624 e. Thus, the number of transiting planet candidates in the system increased to four.

Between 2021 and 2024, a multi-year campaign to measure the star's radial velocities began to determine the planets' masses. The main observations were conducted using the SOPHIE and HARPS-N spectrographs. By 2024, over 120 high-precision measurements had been accumulated, which allowed for the confirmation of the planets' existence and the determination of their masses with high accuracy.

In 2024, the European CHEOPS telescope conducted a series of targeted observations to refine the planets' sizes. As a result, these targeted observations allowed for the refinement of the planets' radii with an uncertainty of less than 1.7%, enabling a detailed calculation of their densities and their classification as sub-Neptunes. At the end of 2024, using Transit Timing Variation (TTV) analysis, it was discovered that planet e was undergoing gravitational perturbations, indicating the presence of an external companion not transiting the star's disk.

On April 21, 2026, an international team of astronomers led by A. Bonfanti published the final results of the study. This publication officially confirmed the existence of a fifth, non-transiting planet, TOI-5624 f, which is in a 2:1 orbital resonance with planet e. The system is often compared to TRAPPIST-1 due to the high precision in determining the planets' physical parameters. It serves as a key object for testing models of planetary system formation and studying how sub-Neptunes retain or lose their gaseous envelopes under stellar radiation.

See also List of multiplanetary systems Transit-timing variation TRAPPIST-1

References

External links Martin, Pierre-Yves (2026). "Planet TOI-5624 b". exoplanet.eu. Retrieved 2026-04-17. Martin, Pierre-Yves (2026). "Planet TOI-5624 c". exoplanet.eu. Retrieved 2026-04-17. Martin, Pierre-Yves (2026). "Planet TOI-5624 d". exoplanet.eu. Retrieved 2026-04-17. Martin, Pierre-Yves (2026). "Planet TOI-5624 e". exoplanet.eu. Retrieved 2026-04-17. Martin, Pierre-Yves (2026). "Planet TOI-5624 f". exoplanet.eu. Retrieved 2026-04-17.

Illustrations

Worked examples

Example 1 — a first encounter with TOI-5624

Start with the simplest possible case. Write down what TOI-5624 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-5624 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-5624 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-5624

In research: TOI-5624 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-5624 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-5624 is common in secondary-school and first-year university syllabi. It links to neighbouring topics G-type main-sequence stars, Planetary systems with five confirmed planets, TESS Objects of Interest, so understanding it makes those chapters shorter.
In everyday life: Look for TOI-5624 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “TOI-5624” →

Affiliate

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

How to study TOI-5624 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TOI-5624 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-5624 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TOI-5624 in simple terms?

Why does TOI-5624 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-5624?

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-5624.