AngoSat-2 | Proton-M/Blok DM-03 | Everyday Astronaut

Lift Off Time
(Subject to change)
October 12, 2022
Mission Name
AngoSat 2
Launch Provider
(What rocket company is launching it?)
ROSCOSMOS
Customer
(Who’s paying for this?)
AngoSat
Rocket
Proton M/Blok DM-03
Launch Location
Launch Complex 81/24, Baikonur Cosmodrome, Kazakhstan
Payload mass
~ 1647 kg
Where is the spacecraft going?
Geostationary orbit
Will they be attempting to recover the first stage?
No, this is not a capability of Proton-M
Where will the first stage land?
It will crash into the steps of Kazakhstan
Will they be attempting to recover the fairings?
No, this is not a capability of Proton-M
Are these fairings new?
Yes
How’s the weather looking?
TBD
This will be the:
– 1st launch of Proton-M in 2022
– 113th mission of a Proton-M rocket

– 134th orbital launch attempt of 2022
Where to watch
If available, an official livestream will be listed here

What Does All This Mean?

The AngoSat 2 will launch an atop the Proton M rocket, lifting off from the Baikonur Cosmodrome in Kazakhstan, replacing the failed AngoSat 1.

The AngoSat-2

The AngoSat 2 is an Angolan communications satellite built to replace the failed AngoSat 1. The satellite is part of the AngoSat Project which is working on developing communications satellites equipped with C- and Ku-band transponders which will operate in geostationary orbit, as well as developing ground communications and broadcasting infrastructure.

It was expected that the AngoSat 2 would be identical to the original AngoSat 1, however in August 2019 it was revealed that the replacement would be built by ISS Reshetnev (Bus) and Airbus Defense & Space (payload). The satellite has an expected lifespan of 15 years.

AngoSat 1

The AngoSat 1 was launched in December 2017 and successfully reached geostationary transfer orbit. While the satellite separated from the rocket, communication was successfully lost during solar panel. Contact was reestablished the following day but the satellite had begun to drift out of its intended orbital position. In the following days it became clear that there was an issue with the electrical power system which had been causing the drift and it was then decided that no attempts would be made to maneuver the satellite back into its intended orbit.

What Is Proton-M?

Proton-M is a multi-use heavy-lift launch vehicle that first flew on April 7, 2001. It is capable to launch civilian and military satellites, as well as cargo missions to the ISS. This launch vehicle was developed and is manufactured by Khrunichev State Research and Production Space Center. Over the decades, several variants of the Proton rocket have been developed and flown over 400 times.

Compared to its ancestor, Proton-K, the Proton-M rocket has a new control system that not only enhances its power performance, but also improves its operational and environmental characteristics. For instance, it makes propellants utilization more efficient. It ensures that almost all fuel on the first stage of Proton-M burns up completely during ascent and the rocket crashes on land with empty tanks, which prevents contamination of the area.

The new system also provides a more controlled landing of the first stage. This has two benefits: easier debris recovery and reduced rent payment (the Baikonur Cosmodrome is located in Kazakhstan, where Russia leases the land). Moreover, it has larger payload fairings, which is more than doubles available space for payloads.

The Proton-M rocket on the launch pad (Credit: ROSCOSMOS/Yuzhny Space Center)

The rocket consists of four stages, all of them are expendable. Proton-M is about 58.2 meters (191 ft) in height and 7.4 meters (24 feet) in diameter. The vehicle’s total lift-off mass is approximately 705,000 kg (1,554,000 lb). The rocket’s payload lift capacity to low-Earth orbit (LEO) is 22,400 kg (49383 Ib).

Stages

First Stage Second Stage Third stage
Engine 6 RD-276 3 RD-0210 and 1 RD-0211 RD-0213 and RD-0214
Total Thrust, kN / Ibf 10,032 / 2,255,283,
sea ​​level
2,354 kN / 529,200,
sea ​​level
572 / 128,590Ibf,
vacuum
Specific Impulse, s 288, sea level
316
320, sea level
327
325
Burn time, s 121 211 258

First Stage

The first stage (21.2 m in length) consists of a central cylindrical part, which is an oxidizer tank, and six side-fuel tanks, each one of them is carrying an RD-276 engine. Unlike the four side-boosters on Soyuz 2 rockets, the ones on Proton-M are not detachable.

One interesting fact about the Proton-M rocket is that its design was greatly affected by the logistics. For example, the diameter of its oxidizer tank is the maximum that can be delivered to the pad by rail.

Proton-M rocket's first stage that consists of a central cylindrical core and 6 boosters
The Proton-M rocket’s first stage (Credit: ROSCOSMOS/Yuzhny Space Center)

The RD-276 engine runs on a hypergolic propellant that uses dinitrogen tetroxide (N2O4) as an oxidizer and unsymmetrical dimethylhydrazine (UDMH, (CH₃)₂N₂H₂) as a fuel. Each one of these engines has one combustion chamber and together they are capable of producing a thrust of 10,032 kN (2,255,283 Ibf) at sea level, with an ISP of 288 s at sea level and 316 s in a vacuum. A burn time of this stage is ∼121 s. The RD-276 engines can control thrust vector by swiveling tangentially up to 7° from their neutral position.

Second Stage

The second stage is 17.1 m long and is powered by three RD-0210 engines and one RD-0211 engine. The engines on this stage start their ignition sequence prior to stage separation. This process is called “hot fire staging”. That is why the second stage is joined to the first one through an interstage with a lattice structure and not through a closed one. This design allows the exhaust to escape and also reduces the mass of the interstage. Each one of these engines has one combustion chamber, runs on UDMH and N2O4, and burns for 211 s. A total thrust produced by this stage is 2,354 kN (529,200 Ibf) with an ISP of 320 s at sea level.

Third stage

Like the other two stages, the third one operates on UDMH and N2O4. It is 4.1 m long and is powered by one RD-0213 engine, and one RD-0214 engine. The RD-0213 engine has one combustion chamber and burns for 241 s, while the RD-0214 has one combustion chamber, four nozzles, and a burn time of 258.3 s. An ISP of this stage is 325 s in a vacuum and a total thrust is 572 kN (128,590Ib)f).

Fourth Stage

This particular launch will utilize the Blok DM-03 upper stage. This will be only the fourth launch of the Blok DM-03. The stage is powered by a single RD-58MF engine which burns RP-1 and LOX propellant.

Rocket section adapted from Mariia Kiseleva

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