Satria | Falcon 9 Block 5

Lift Off Time
(Subject to change)
June 18, 2023 – 22:04 UTC | 18:04 EDT
Mission Name
Satria, a communications satellite
Launch Provider
(What rocket company is launching it?)
(Who’s paying for this?)
Pasifik Satelit Nusantara
Falcon 9 Block 5, B1067-12; 35.71-day turnaround
Launch Location
Space Launch Complex 40 (SLC-40), Cape Canaveral Space Force Base, Florida, USA
Payload mass
~5,000 kg (~11,000 lb) (estimated)
Where are the satellites going?
Geostationary Transfer Orbit; Raise to 146-degree East Geostationary Earth Orbit
Will they be attempting to recover the first stage?
Where will the first stage land?
~637 km downrange on A Shortfall of Gravitas

Tug: Doug; Support: Doug
Will they be attempting to recover the fairings?
The fairing halves will be recovered from the water ~681 km downrange by Doug
Are these fairings new?
The fairings are likely flight proven
How’s the weather looking?
The weather is currently 75% go for launch (as of June 9, 2023 12:45 UTC)
This will be the:
– 233rd Falcon 9 launch
– 168th Falcon 9 flight with a flight-proven booster
– 174th re-flight of a booster
– 40th re-flight of a booster in 2023
– 201st booster landing
– 127th consecutive landing (a record)
– 42nd launch for SpaceX in 2023
– 129th SpaceX launch from 
– 91st orbital launch attempt of 2023
Where to watch
Official Livestream

What’s This All Mean?

SpaceX’s Satria mission will launch the Satria satellite for Pasifik Satelit Nusantara atop a Falcon 9 rocket. The Falcon 9 will lift off from Space Launch Complex 40 (SLC-40), at the Cape Canaveral Space Force Station, in Florida, United States. Satria will be placed into a geostationary transfer orbit, where it will spend the following months raising its orbit to the 146-degree East Geostationary Earth Orbit slot.

What Is Satria

Satria is a very high throughput communication satellite built by Thales Alenia Space for Satelit Nusantara Tiga consortium. This payload will provide 90,000 schools, 40,000 hospitals, and many other residential and governmental sites with 150 gigabit per second coverage. The satellite is built on the Spacebus-Neo-200 fully electric spacebus, which was fitted with a fifth-generation digital processor. Satria has two deployable solar arrays and batteries to power the satellite. It has an on-orbit lifespan of 15 years.

An artist’s rendering of the Satria satellite. (Credit: TAS)

What Is Falcon 9 Block 5?

The Falcon 9 Block 5 is SpaceX’s partially reusable two-stage medium-lift launch vehicle. The vehicle consists of a reusable first stage, an expendable second stage, and, when in payload configuration, a pair of reusable fairing halves.

First Stage

The Falcon 9 first stage contains 9 Merlin 1D+ sea-level engines. Each engine uses an open gas generator cycle and runs on RP-1 and liquid oxygen (LOx). Each engine produces 845 kN of thrust at sea level, with a specific impulse (ISP) of 285 seconds, and 934 kN in a vacuum with an ISP of 313 seconds. Due to the powerful nature of the engine, and the large amount of them, the Falcon 9 first stage is able to lose an engine right off the pad, or up to two later in the flight, and be able to successfully place the payload into orbit.

The Merlin engines are ignited by triethylaluminum and triethylborane (TEA-TEB), which instantly burst into flames when mixed in the presence of oxygen. During static fire and launch the TEA-TEB is provided by the ground service equipment. However, as the Falcon 9 first stage is able to propulsively land, three of the Merlin engines (E1, E5, and E9) contain TEA-TEB canisters to relight for the boost back, reentry, and landing burns.

Second Stage

The Falcon 9 second stage is the only expendable part of the Falcon 9. It contains a singular MVacD engine that produces 992 kN of thrust and an ISP of 348 seconds. The second stage is capable of doing several burns, allowing the Falcon 9 to put payloads in several different orbits.

SpaceX is currently flying two different versions of the MVacD engine’s nozzle. The standard nozzle design is used on high-performance missions. The other nozzle is a significantly shorter version of the standard, decreasing both performance and material usage; with this nozzle, the MVacD engine produces 10% less thrust in space. This nozzle is only used on lower-performance missions, as it decreases the amount of material needed by 75%. This means that SpaceX can launch over three times as many missions with the same amount of Niobium as with the longer design.

For missions with many burns and/or long coasts between burns, the second stage is able to be equipped with a mission extension package. When the second stage has this package it has a grey strip, which helps keep the RP-1 warm, an increased number of composite-overwrapped pressure vessels (COPVs) for pressurization control, and additional TEA-TEB.

falcon 9 block 5, launch
Falcon 9 Block 5 launching on the Starlink V1.0 L27 mission (Credit: SpaceX)

Falcon 9 Booster

The booster supporting the Satria mission is B1067-12; as the name implies, the booster has supported 11 previous flights. Upon successful landing, its designation will change to B1067-13.

B1067’s previous missionsLaunch Date (UTC)Turnaround Time (Days)
Dragon CRS-2 SpX-22June 03, 2021, 17:29N/A
Crew-3November 11, 2021, 02:03160.36
Türksat 5BDecember 19, 2021, 03:5838.08
Crew-4April 27, 2022, 07:52129.16
Dragon CRS-2 SpX-25July 15, 2022, 00:4478.70
Starlink Group 4-34September 19, 2022, 00:1865.98
Hotbird 13GNovember 03, 2022, 05:2245.13
O3b mPOWER 1&2December 16, 2022, 22:3843.72
Starlink Group 5-2January 26, 2023, 9:3240.45
Starlink Group 5-5March 24, 2023 15:4357.26
Starlink Group 5-9May 14, 2023 05:0350.56
SatriaJune 18, 2023 22:0435.71

Following stage separation, Falcon 9 will conduct two burns. These burns aim to softly touch down the booster on SpaceX’s autonomous spaceport drone ship A Shortfall of Gravitas.

falcon 9 booster, landing, drone ship
Falcon 9 landing on Of Course I Still Love You after launching Bob and Doug (Credit: SpaceX)

Falcon 9 Fairings

The Falcon 9’s fairing consists of two dissimilar reusable halves. The first half (the half that faces away from the transport erector) is called the active half, and houses the pneumatics for the separation system. The other fairing half is called the passive half. As the name implies, this half plays a purely passive role in the fairing separation process, as it relies on the pneumatics from the active half.

Both fairing halves are equipped with cold gas thrusters and a parafoil which are used to softly touch down the fairing half in the ocean. SpaceX used to attempt to catch the fairing halves, however, at the end of 2020 this program was canceled due to safety risks and a low success rate. On Satria, SpaceX will attempt to recover the fairing halves from the water with its recovery vessel Doug.

In 2021, SpaceX started flying a new version of the Falcon 9 fairing. The new “upgraded” version has vents only at the top of each fairing half, by the gap between the halves, whereas the old version had vents placed spread equidistantly around the base of the fairing. Moving the vents decreases the chance of water getting into the fairing, making the chance of a successful scoop significantly higher.

All times are approximate

00:38:00SpaceX Launch Director verifies go for propellant load
00:35:00RP-1 (rocket-grade kerosene) loading underway
00:35:001st stage LOX (liquid oxygen) loading underway
00:16:002nd stage LOX loading underway
00:07:00Falcon 9 begins engine chill prior to launch
00:01:00Command flight computer to begin final prelaunch checks
00:01:00Propellant tank pressurization to flight pressure begins
00:00:45SpaceX Launch Director verifies go for launch
00:00:03Engine controller commands engine ignition sequence to start
00:00:00Falcon 9 liftoff

Satria Launch, Landing, and Deployment

00:01:14Max Q (moment of peak mechanical stress on the rocket)
00:02:331st stage main engine cutoff (MECO)
00:02:371st and 2nd stages separate
00:02:442nd stage engine starts (SES-1)
00:03:30Fairing deployment
00:06:331st stage entry burn starts
00:06:541st stage entry burn ends
00:08:102nd stage engine cutoff (SECO-1)
00:08:281st stage landing burn start
00:08:391st stage landing
00:27:402nd stage engine starts (SES-2)
00:28:362nd stage engine cutoff (SECO-2)
00:36:47PSN SATRIA deploys

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