astronomy

WISE J2030+0749

WISE J2030+0749 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 WISE J2030+0749 rather than just read about it. In short: WISE J2030+0749 is a nearby brown dwarf of spectral type T1.5, in the constellation Delphinus, approximately 31.7 light-years (9.7 parsecs) from Earth. History of observations The discovery of WISE J2030+0749 was announced in 2013 by Mace et al. and independently by Bihain et al.

Key takeaways

WISE J2030+0749 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WISE J2030+0749 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WISE J2030+0749 from memory before moving on to harder problems.

Reference excerpt

WISE J2030+0749 is a nearby brown dwarf of spectral type T1.5, in the constellation Delphinus, approximately 31.7 light-years (9.7 parsecs) from Earth.

History of observations The discovery of WISE J2030+0749 was announced in 2013 by Mace et al. and independently by Bihain et al. Mace et al. selected T-type brown dwarf candidates from the WISE All-Sky source catalogue and carried out follow up observations using a variety of telescopes. On September 11, 2011, WISE J2030+0749 was observed using SpeX at the Infrared Telescope Facility (IRTF). The discovery paper was submitted to The Astrophysical Journal Supplement, accepted for publication on 2013 January 15 and published in March, 2013. The total number of brown dwarfs announced in Mace et al. (2013) is 87, all are of T-type. Bihain et al. selected sources with colours typical for T dwarfs from the WISE All-Sky source catalogue and checked them for high proper motion using older surveys: 2MASS, DENIS, SDSS, SSS, DSS and UKIDSS. Three objects among about ten candidates, including WISE J2030+0749, were selected for spectroscopic follow up with the Large Binocular Telescope (LBT). On November 8, 2012, Bihain et al. carried out follow up observations of WISE J2030+0749 with near-Infrared spectrograph LUCI 1 on LBT. On June 25, 2013 Astronomy & Astrophysics received the discovery paper, which was accepted for publication 10 July 2013.

Distance The distance of WISE J2030+0749 was estimated by Bihain et al. using mean absolute magnitudes of single T1/T2 dwarfs, derived by Dupuy & Liu (2012) from trigonometric parallaxes: 10.5 ± 2.6 pc (34.2 ± 8.5 ly). Its parallax was later measured by the Gaia space telescope, with the Gaia DR3 parallax corresponding to a distance of 9.73±0.08 pc (31.7±0.2 ly).

See also Two other T dwarfs, announced in Bihain et al (2013):

WISE J0457−0207 (T2) WISE J0521+1025 (T7.5)

References

Illustrations

Worked examples

Example 1 — a first encounter with WISE J2030+0749

Start with the simplest possible case. Write down what WISE J2030+0749 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 WISE J2030+0749 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 WISE J2030+0749 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 WISE J2030+0749

In research: WISE J2030+0749 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 WISE J2030+0749 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: WISE J2030+0749 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2013, Brown dwarfs, Delphinus, so understanding it makes those chapters shorter.
In everyday life: Look for WISE J2030+0749 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 WISE J2030+0749 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WISE J2030+0749 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 WISE J2030+0749 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WISE J2030+0749 in simple terms?

WISE J2030+0749 is a nearby brown dwarf of spectral type T1.5, in the constellation Delphinus, approximately 31.7 light-years (9.7 parsecs) from Earth. History of observations The discovery of WISE J2030+0749 was announced in 2013 by Mace et al. and independently by Bihain et al.

Why does WISE J2030+0749 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 WISE J2030+0749?

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 WISE J2030+0749.