astronomy

Intelsat 33e

Intelsat 33e 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 Intelsat 33e rather than just read about it. In short: Intelsat 33e, also known as IS-33e, was a high throughput (HTS) geostationary communications satellite operated by Intelsat and designed and manufactured by Boeing Space Systems on the BSS 702MP satellite bus. It was the second satellite of the EpicNG service, and covered Europe, Africa and most of Asia from the 60° East longitude, where it replaced Intelsat 904.

Key takeaways

Intelsat 33e belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Intelsat 33e to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Intelsat 33e from memory before moving on to harder problems.

Reference excerpt

Intelsat 33e, also known as IS-33e, was a high throughput (HTS) geostationary communications satellite operated by Intelsat and designed and manufactured by Boeing Space Systems on the BSS 702MP satellite bus. It was the second satellite of the EpicNG service, and covered Europe, Africa and most of Asia from the 60° East longitude, where it replaced Intelsat 904. It had a mixed C-band, Ku-band and Ka-band payload with all bands featuring wide and C- and Ku- also featured spot beams. After nearly eight years in service, the satellite broke into at least 57 pieces on 19 October 2024. As of December 2024, over 700 pieces of debris have been detected.

Satellite description

Intelsat 33e was designed and manufactured by Boeing on the Boeing 702MP satellite bus. It had a launch mass of 6,600 kg (14,600 lb) and a design life of more than 15 years. When stowed for launch, the satellite measured 7.9 m × 3.8 m × 3.2 m (26 ft × 12 ft × 10 ft). It was powered by two solar panels, with four panels each, of triple-junction GaAs solar cells. The 702MP platform was designed to generate between 6 kW and 12 kW, but Intelsat 33e was designed to generate 13 kW at the end of its design life. Its payload was the second high throughput EpicNG deployment. The EpicNG is characterized by the implementation of frequency reuse due to a mix of frequency and polarization in small spot beams. Not only applied to the classical High-throughput satellite (HTS) Ka-band, but also applying the same technique in Ku-band and C-band. The EpicNG series also keep the use of wide beams to offer high throughput and broadcast capabilities in the same satellite. In the case of Intelsat 33e, the C-band side had 20 transponders with a total downlink bandwidth of 2,670 MHz. The spot beams offered high bandwidth for Europe, Central Africa, Middle East, Asia and Australia, and a wide beam covered sub-Saharan Africa. The Ku-band had 249 transponder equivalents, for a total downlink bandwidth of 9,194 MHz. The Ku-band spot beams covered Europe, Africa, the Middle East and Asia, while a wide beam was able to broadcast to Europe, Middle East and Asia. The Ka-band payload had 450 MHz of bandwidth on a global beam centered at its position.

History In July 2009, Intelsat became the first customer of the Boeing 702MP satellite bus, when it placed an order for four spacecraft, Intelsat 21, Intelsat 22, Intelsat 27 and the first EpicNG satellite, Intelsat 29e. In May 2013, Intelsat made a second order for an additional four EpicNG satellites, the first of which would be Intelsat 33e. On 15 July 2016, Senior Space Program Managers Richard Laurie and Brian Sing blogged that they had been at the Boeing factory overseeing the transport preparations for Intelsat 33e to French Guiana. There it would join another Intelsat satellite, Intelsat 36, for integration on the Ariane 5 ECA launcher, which was expected to launch on 24 August 2016. On 22 July 2016, Intelsat announced that Intelsat 33e had arrived to the Guiana Space Center for launch preparations. It also announced not only communication but aeronautical and maritime mobility clients that were expecting the satellite service. On 27 July 2016, it was explained that the satellite had traveled by truck from the factory to an airport in California, where it was loaded in an Antonov 124. It flew to Florida for a refuelling stop and then flew straight to Kourou airport. At the French launch site, even though Intelsat is the owner of the two passengers of the Ariane 5 ECA VA 232 flight, they have separate launch teams. Each satellite is built by a different manufacturer, and it has a different supervisor team within Intelsat. On 24 August 2016, at 22:16:01 UTC, after a slight delay due to a rocket issue, the Ariane 5 ECA VA-232 flight launched from Guiana Space Center ELA-3, with Intelsat 33e and Intelsat 36. At 22:44 UTC, Intelsat 33e separated from the rocket's upper stage. After 41 minutes of flight, both satellites had separated successfully. Intelsat confirmed that it had received the satellites signals as expected after separation. Arianespace estimated the insertion orbit as 248.7 km × 35,858 km × 5.98°, very close to the target of 249.0 km × 35,879 km × 6.00°. On 9 September 2016, Intelsat announced that due to a malfunction in the LEROS-1c primary thruster, it would require more time for orbit rising and thus the service date had been moved from the last quarter of 2016 to the first of 2017. On 22 September 2016, insurance officials estimated that the main propulsion failure would not reduce the on orbit life of the spacecraft more than 18 months. This could translate to an insurance claim by Intelsat of around 10% (1.5 years) of the satellite service life, which could have a value close to US$40 million. Intelsat 33e entered service on 29 January 2017, three months later than planned. In August 2017, another propulsion issue appeared, leading to larger-than-expected propellant usage to control the satellite attitude during the north/south station keeping maneuvers. This issue reduced the orbital life-time by about 3.5 years.

Disintegration Late on 19 October 2024, U.S. Space Command reported that the satellite had broken up into about 20 pieces at approximately 04:30 UTC that morning. At least 700 pieces of space debris associated with the event have since been detected. Intelsat declared the satellite a total loss on 21 October 2024. The 2024 loss was not insured, unlike the earlier malfunction of the satellite in 2016. The satellite's predecessor, Intelsat 29e, also suffered a premature failure and was rendered inoperable after only three years in service.

References

Worked examples

Example 1 — a first encounter with Intelsat 33e

Start with the simplest possible case. Write down what Intelsat 33e 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 Intelsat 33e 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 Intelsat 33e 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 Intelsat 33e

In research: Intelsat 33e 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 Intelsat 33e 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: Intelsat 33e is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ariane commercial payloads, Communications satellites in geostationary orbit, Intelsat satellites, so understanding it makes those chapters shorter.
In everyday life: Look for Intelsat 33e 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 “Intelsat 33e” →

Affiliate

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

How to study Intelsat 33e in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Intelsat 33e 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 Intelsat 33e out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Intelsat 33e in simple terms?

Why does Intelsat 33e 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 Intelsat 33e?

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 Intelsat 33e.