astronomy

S5 2007+777

S5 2007+777 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 S5 2007+777 rather than just read about it. In short: S5 2007+777 is a classical BL Lacertae object located in the constellation of Draco. This object has a redshift of (z) 0.342 and was first discovered in 1981 as a flat-spectrum radio quasar.

Key takeaways

S5 2007+777 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect S5 2007+777 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of S5 2007+777 from memory before moving on to harder problems.

Reference excerpt

S5 2007+777 is a classical BL Lacertae object located in the constellation of Draco. This object has a redshift of (z) 0.342 and was first discovered in 1981 as a flat-spectrum radio quasar. It has characteristics of different Fanaroff-Riley classes on both sides of its active nucleus making it a rare type of Hybrid morphology radio sources (HYMORs). It has an estimated V magnitude of 16.5.

Description S5 2007+777 is classified as a blazar showing variability across the electromagnetic spectrum with amplitudes rising steadily along with frequency. It is also an Intraday Variable (IDV) source exhibiting variations as a whole as well as in polarized intensity on time scales ranging from 2 to 6 days at centimeter (cm) wavelengths. In dereddened B and I-band light curves during observations conducted in 2001, S5 2007+777 shows a smaller amplitude variation of 10%. Subsequent observations conducted in both 2002 and 2004, shows the object having minimum to maximum variations of order 30-40% on 2-4 day time scales. Although mostly in a quiescent state, one outburst was detected in S5 2007+777 between 1991 and 1992 with the peak flux of this source reaching 3.69 Jansky at 14.5 GHz. A gamma ray flare was detected in February 2016 during an observation from the Foligno Observatory via a 30 cm telescope. According to radio imaging of S5 2007+777 made by Very Long Baseline Array, a one-sided core-jet structure is found with one of the components exhibiting proper motion and greater flux density. Imaging by Very Large Array and Very Long Baseline Interferometry, shows the object as a core-dominated source instead, consisting of a bright radio lobe on the eastern side and a long jet on the western side of the nucleus which terminates without a clear hot spot upon reaching at 10 arcseconds from the nucleus. This jet is known to show superluminal motion, being aligned 24° to the line of sight with its 4.9 GHz luminosity calculated to be 1032 erg s−1 Hz−1. The radio emission of the jet in S5 2007+777 shows several unique radio knots with the brightest one located midstream. The jet itself imaged at 1.49 GHz, has an extended structure in linear direction which it bends west at a changed position angle of 20°. An extended X-ray jet was also found by Chandra on kiloparsec-scales, making S5 2007+777 only one of the four BL Lacertae objects to have this feature.

References

External links S5 2007+777 on SIMBAD S5 2007+777 on NASA/IPAC Database

Illustrations

Worked examples

Example 1 — a first encounter with S5 2007+777

Start with the simplest possible case. Write down what S5 2007+777 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 S5 2007+777 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 S5 2007+777 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 S5 2007+777

In research: S5 2007+777 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 S5 2007+777 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: S5 2007+777 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1981, BL Lacertae objects, so understanding it makes those chapters shorter.
In everyday life: Look for S5 2007+777 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 “S5 2007+777” →

Affiliate

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

How to study S5 2007+777 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what S5 2007+777 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 S5 2007+777 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is S5 2007+777 in simple terms?

S5 2007+777 is a classical BL Lacertae object located in the constellation of Draco. This object has a redshift of (z) 0.342 and was first discovered in 1981 as a flat-spectrum radio quasar.

Why does S5 2007+777 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 S5 2007+777?

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 S5 2007+777.