astronomy

NGC 6505

NGC 6505 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 NGC 6505 rather than just read about it. In short: NGC 6505 is an elliptical galaxy with Hubble sequence classification E/S0 in the northern celestial hemisphere constellation Draco. It is about 608 million light years away from the Milky Way galaxy and has a diameter of about 190,000 light years.

Key takeaways

NGC 6505 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 6505 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6505 from memory before moving on to harder problems.

Reference excerpt

NGC 6505 is an elliptical galaxy with Hubble sequence classification E/S0 in the northern celestial hemisphere constellation Draco. It is about 608 million light years away from the Milky Way galaxy and has a diameter of about 190,000 light years. It was discovered on June 27, 1884 by Lewis A. Swift. In 2025, the Euclid Space Telescope found a complete Einstein ring surrounding NGC 6505. With the help of the lens model some properties of the central region of NGC 6505 were estimated. One result is that the central region has an initial mass function that is heavier than predicted with Chabrier and a dark matter fraction of 11.1+5.4−3.5 % inside the Einstein radius.

Altieri's lens

A gravitational lens was discovered by Euclid Archive Scientist Bruno Altieri in data from ESA's Euclid telescope. The researchers therefore suggest the nickname "Altieri's lens". The discovery was made with early testing data from September 2023, which was out of focus. Later Euclid imaged the galaxy and the lensed galaxy with both the VIS and NIS instruments. The lens was also observed with resolved spectroscopy of the Keck Cosmic Web Imager (KCWI) and the Dark Energy Spectroscopic Instrument (DESI). The lensed galaxy has a redshift of 0.4058 ± 0.003, equivalent to a distance of 4.46 billion light-years. The discoverers called the discovery an "exceptionally rare strong lens" and the first gravitational lens found in any NGC galaxy.

See also List of NGC objects (6001–7000)

References

External links "NGC 6505". SIMBAD. Retrieved 2019-08-07. "NGC 6505". DSO Browser. Retrieved 2016-08-07. Auke Slotegraaf. "NGC 6505". Deep Sky Observer's Companion. Retrieved 2016-08-07.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6505

Start with the simplest possible case. Write down what NGC 6505 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 NGC 6505 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 NGC 6505 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 NGC 6505

In research: NGC 6505 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 NGC 6505 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: NGC 6505 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1884, Discoveries by Lewis Swift, Draco (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6505 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 NGC 6505 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6505 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 NGC 6505 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6505 in simple terms?

Why does NGC 6505 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 NGC 6505?

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 NGC 6505.