astronomy

NSVS 14256825

NSVS 14256825 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 NSVS 14256825 rather than just read about it. In short: NSVS 14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises a subdwarf O star and red dwarf star.

Key takeaways

NSVS 14256825 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NSVS 14256825 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NSVS 14256825 from memory before moving on to harder problems.

Reference excerpt

NSVS 14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises a subdwarf O star and red dwarf star. The two stars orbit each other every 2.648976 hours. Based on the stellar parallax of the system, observed by Gaia, the system is located approximately 2,700 light-years (840 parsecs) away. In 2007, Patrick Wils et al. discovered that NSVS 14256825 is an eclipsing binary, by examining the Northern Sky Variability Survey (NSVS) data. They also classified it as an HW Virginis type star, a binary pair in which variability arises from one star reflecting the light of the other as they orbit each other.

Nomenclature The system is most commonly referred to using its designation from the NSVS, a survey of stars with apparent magnitudes between 8 and 15.5. It also has a variable star designation, V1828 Aquilae.

Eclipse timing variations NSVS 14256825 has been very well-studied using photometry, but the resulting models often contradict each other, even with similar statistical significance, or with data that are collected later. Many studies have found that this system exhibits eclipse timing variations (ETVs) that are significant, cyclic and not explainable by other stellar mechanisms such as the Applegate mechanism. In 2012, it was found that the orbit of NSVS 14256825 was increasing at a rate of 12×10−12 days per orbit. Initially, in 2012 it was claimed that two giant planets were in orbit around the binary, with masses of 2.9 and 8.1 times the Jupiter mass orbiting with periods of 3.5 and 6.9 years respectively. Another paper claimed the existence of one planet with a mass 12 times that of Jupiter, in a 20-year orbit. However, subsequent studies have come up with different results with masses up to 15 MJ and periods down to 8.83 years. Studies also do not agree on whether one substellar body can explain the ETVs, or whether additional companions are necessary, but further research is needed to obtain better coverage of data. In 2025 it was found that all models fail to predict new changes in eclipse timing. While this does not rule out the existence of the planets, it is possible that multiple mechanisms are responsible for the ETVs.

See also HW Virginis CM Draconis QS Virginis NN Serpentis List of extrasolar planets

References

Illustrations

Worked examples

Example 1 — a first encounter with NSVS 14256825

Start with the simplest possible case. Write down what NSVS 14256825 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 NSVS 14256825 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 NSVS 14256825 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 NSVS 14256825

In research: NSVS 14256825 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 NSVS 14256825 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: NSVS 14256825 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Algol variables, Aquila (constellation), Eclipsing binaries, so understanding it makes those chapters shorter.
In everyday life: Look for NSVS 14256825 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 NSVS 14256825 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NSVS 14256825 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 NSVS 14256825 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NSVS 14256825 in simple terms?

NSVS 14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises a subdwarf O star and red dwarf star.

Why does NSVS 14256825 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 NSVS 14256825?

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 NSVS 14256825.