astronomy

Stella Ludoviciana

Stella Ludoviciana 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 Stella Ludoviciana rather than just read about it. In short: Stella Ludoviciana, also known as HD 116798, is an 8th-magnitude star in the asterism of the Big Dipper in the constellation Ursa Major, halfway between Mizar and Alcor. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly four times more distant.

Key takeaways

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

Reference excerpt

Stella Ludoviciana, also known as HD 116798, is an 8th-magnitude star in the asterism of the Big Dipper in the constellation Ursa Major, halfway between Mizar and Alcor. A line-of-sight companion with Mizar and Alcor (with a spectral type similar to the latter), it is roughly four times more distant. It has the spectral type A8/F0 III. That spectral class suggests it is a giant star, but evolutionary models place it on the main sequence. The star was observed on 2 December 1722 by Johann Georg Liebknecht, who mistook it for a planet and named it after Louis V, Landgrave of Hesse-Darmstadt. Unknown to Liebknecht, it had been previously observed by Benedetto Castelli in 1616. In different sources the name may be written as "Sidus Ludovicianum", "Sidus Ludoviciana", or "Stella Ludoviciana". The name Stella Ludoviciana was officially approved by the IAU Working Group on Star Names on 17 April 2026. The star is six times more luminous than the Sun, 1.6 times its radius, and has a surface temperature of 7,200 K. Spectral classification based on a spectrum taken for radial velocity measurement tentatively determined a spectral and luminosity class of A8/F0III, which would indicate that it has exhausted its core hydrogen and started to evolve away from the main sequence, however giant stars of this type should be at least ten times more luminous than measured for Stella Ludoviciana. It shows evidence of Gamma Doradus pulsations, and is a likely member of a young stellar association known as Group-X.

References

External links Leos Ondra: A New View of Mizar Archived 2008-03-07 at the Wayback Machine Astrophoto

Illustrations

Worked examples

Example 1 — a first encounter with Stella Ludoviciana

Start with the simplest possible case. Write down what Stella Ludoviciana 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 Stella Ludoviciana 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 Stella Ludoviciana 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 Stella Ludoviciana

In research: Stella Ludoviciana 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 Stella Ludoviciana 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: Stella Ludoviciana is common in secondary-school and first-year university syllabi. It links to neighbouring topics A-type giants, Durchmusterung objects, F-type giants, so understanding it makes those chapters shorter.
In everyday life: Look for Stella Ludoviciana 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 “Stella Ludoviciana” →

Affiliate

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

How to study Stella Ludoviciana in 20 minutes

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

Frequently asked questions

What is Stella Ludoviciana in simple terms?

Why does Stella Ludoviciana 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 Stella Ludoviciana?

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 Stella Ludoviciana.