astronomy

Vega 1

Vega 1 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 Vega 1 rather than just read about it. In short: Vega 1 (along with its twin Vega 2) was a Soviet space probe, part of the Vega program. The spacecraft was a development of the earlier Venera craft.

Key takeaways

Vega 1 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Vega 1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Vega 1 from memory before moving on to harder problems.

Reference excerpt

Vega 1 (along with its twin Vega 2) was a Soviet space probe, part of the Vega program. The spacecraft was a development of the earlier Venera craft. They were designed by Babakin Space Centre and constructed as 5VK by Lavochkin at Khimki. The name VeGa (ВеГа) combines the first two letters from the Russian words for Venus (Венера: "Venera") and Halley (Галлея: "Galleya"). The craft was powered by twin large solar panels and instruments included an antenna dish, cameras, spectrometer, infrared sounder, magnetometers (MISCHA), and plasma probes. The 4,840 kg (10,670 lb) craft was launched by a Proton-K rocket from Baikonur Cosmodrome, Tyuratam, Kazakh SSR. Both Vega 1 and 2 were three-axis stabilized spacecraft. The spacecraft were equipped with a dual bumper shield for dust protection from Halley's Comet.

Venus mission The descent module arrived at Venus on 11 June 1985, two days after being released from the Vega 1 flyby probe. The module, a 1,500 kg (3,300 lb) sphere with a diameter of 240 cm (94 in), contained a surface lander and a balloon explorer, which would become the first man-made aircraft to fly on a planet besides Earth. The flyby probe performed a gravitational assist maneuver using Venus, and continued its mission to intercept the comet.

Descent craft

The surface lander was identical to that of Vega 2 as well as six previous Venera missions. The objective of the probe was the study of the atmosphere and the exposed surface of the planet. The scientific payload included an ultraviolet spectrometer, temperature and pressure sensors, a water concentration meter, a gas-phase chromatograph, an X-ray spectrometer, a mass spectrometer, and a surface sampling device. Since the probe made a nighttime landing, no images were taken. Several of these scientific tools (the UV spectrometer, the mass spectrograph, and the devices to measure pressure and temperature) were developed in collaboration with French scientists. The lander successfully touched down at 8.05°N 176.89°E / 8.05; 176.89 in the Rusalka Planitia north of Aphrodite Terra. Due to excessive turbulence, some surface experiments were inadvertently activated 20 km (12 mi) above the surface. Only the mass spectrometer was able to return data. Tools on the lander include:

Thermometers Barometers UV absorption spectrometer—ISAV-S Optical aerosol analyzer, Nephelometer—ISAV-A Aerosol particle-size counter—LSA Aerosol mass spectrometer—MALAKHIT-M Aerosol gas chromatograph—SIGMA-3 Aerosol X-ray fluorescence spectrometer—IFP Hygrometer—VM-4 Soil X-ray fluorescence spectrometer—BDRP-AM25 Gamma-ray spectrometer—GS-15STsV Penetrometer / Soil ohmmeter—Prop-V Stabilized oscillator / Doppler radio

Balloon

The Vega 1 Lander/Balloon capsule entered the Venusian atmosphere (125 kilometres [78 mi] altitude) at 2:06:10 UT (Earth received time; Moscow time 5:06:10 AM) on 11 June 1985 at roughly 11 kilometres per second (6.8 mi/s). At approximately 2:06:25 UT the parachute attached to the landing craft cap opened at an altitude of 64 km (40 mi). The cap and parachute were released 15 seconds later at 63 km (39 mi) altitude. The balloon package was pulled out of its compartment by parachute 40 seconds later at 61 km (38 mi) altitude, at 8.1 degrees N, 176.9 degrees east. A second parachute opened at an altitude of 55 km (34 mi), 200 seconds after entry, extracting the furled balloon. The balloon was inflated 100 seconds later at 54 km (34 mi) and the parachute and inflation system were jettisoned. The ballast was jettisoned when the balloon reached roughly 50 km (31 mi) and the balloon floated back to a stable height between 53 and 54 km (33 and 34 mi) some 15 to 25 minutes after entry, becoming the first man-made aircraft to fly on a celestial body besides Earth. The mean stable height was 53.6 kilometres (33.3 mi), with a pressure of 535 millibars (535 hPa) and a temperature of 300–310 K (27–37 °C; 80–98 °F) in the middle, most active layer of the Venus three-tiered cloud system. The balloon drifted westward in the zonal wind flow with an average speed of about 69 metres per second (230 ft/s) (248 kilometres per hour [154 mph]) at nearly constant latitude. The probe crossed the terminator from night to day at 12:20 UT on 12 June after traversing 8,500 km (5,300 mi). The probe continued to operate in the daytime until the final transmission was received at 00:38 UT on 13 June from 8.1 N, 68.8 E after a total traverse distance of 11,600 km (7,200 mi) or about 30% of the circumference of the planet. It is not known how much farther the balloon traveled after the final communication.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Vega 1

Start with the simplest possible case. Write down what Vega 1 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 Vega 1 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 Vega 1 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 Vega 1

In research: Vega 1 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 Vega 1 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: Vega 1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1984 in spaceflight, 1984 in the Soviet Union, Derelict satellites in heliocentric orbit, so understanding it makes those chapters shorter.
In everyday life: Look for Vega 1 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 Vega 1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Vega 1 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 Vega 1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Vega 1 in simple terms?

Vega 1 (along with its twin Vega 2) was a Soviet space probe, part of the Vega program. The spacecraft was a development of the earlier Venera craft.

Why does Vega 1 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 Vega 1?

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 Vega 1.