Astra prepares to launch maiden orbital test flight

The Pacific Spaceport Complex, located in Kodiak, Alaska, is preparing to support the launch of Astra’s first orbital test flight, featuring the company’s Rocket 3.1 launcher. Teams are currently conducting final preparations ahead of the opening of the two hour launch window, which is currently set to open at 7:00 pm Pacific time on August 2 (10:00 pm Eastern; 02:00 UTC on August 3).

This launch will be the third for Astra, following two flights from the PSCA in July and November 2018, respectively. These were originally believed to be failures. However, Astra stated that the first (designated Rocket 1.0) was successful, and that the second (Rocket 2.0) was “shorter than planned”. Neither rocket was designed to reach orbit, as they did not have functioning upper stages.

The Alameda, California-based company was previously notorious for operating in almost complete secrecy, as very little was known about their vehicles, testing campaigns, and launch attempts. The only public sighting of an Astra rocket – which, coincidentally, was Rocket 1.0 – was by a news helicopter in early 2018 at the former Naval Air Station Alameda.

Rocket 1.0 performing a static fire test at Astra’s headquarters in Alameda – credit: Astra

However, in early 2020, Astra went public with their efforts, and subsequently released information about their operations.

This was done ahead of their first planned launch for the Defense Advanced Research Projects Agency’s (DARPA) Launch Challenge, in which three aerospace companies – Astra, Vector Space Systems, and Virgin Orbit – were chosen in March 2019 to demonstrate rapid launch capabilities by launching two missions to low Earth orbit from separate launch sites.

The provider that would have completed the first flight successfully would have received a $2 million prize from DARPA, and would have been eligible to perform a second successful launch for the agency in exchange for another $10 million grand prize.

Vector Space Systems entered their Vector-R rocket into the competition, while Virgin Orbit submitter their air-launched LauncherOne. Astra entered their Rocket 3.0, which was capable of delivering a 150 kilogram (330 pound) payload to a 500 kilometer (310.6 mile) Sun-synchronous orbit.

In September 2019, Vector announced their withdrawal from the DARPA Launch Challenge after losing major funding the month before, thereby leaving two companies left to compete for the monetary prizes. However, Virgin Orbit dropped out the following month, so as to shift their focus towards bringing their LauncherOne into operation.

This left Astra as the sole contestant in the Launch Challenge, and enabled the company to prepare for their first launch without the threat of competition for the grand prize.

Astra rolled their Rocket 3.0 vehicle to their custom-built launch pad at the PSCA in Alaska in mid-February 2020 ahead of the first orbital launch of the DARPA Launch Challenge, which was scheduled to take place anywhere from late February to early March. However, a series of delays caused the launch to slip to the final day of the launch window, eventually culminating in a scrub at T-53 seconds on March 2 due to a ground support equipment (GSE) issue.

As Astra had run out of available time in the launch window for the first flight of the Launch Challenge, they were not eligible for the prizes put out by DARPA. However, the company made efforts to return to the launch pad and conduct the flight regardless, sans the payloads that DARPA had manifested for the competition.

However, shortly after completing a fueling test ahead of launch in March 2020, an anomaly occurred on the pad, leading to the loss of the vehicle. According to Astra CEO Chris Kemp, a valve had stuck open during detanking, which led to an over-pressurization event. No personnel were harmed as a result of the anomaly.

In June 2020, the company announced that they would return to the PSCA for another launch attempt, with the opening of the window initially set to take place on July 20 before being rescheduled for August 2.

This will be the first flight of Astra’s new “Rocket 3.1”, which supposedly features incremental design improvements over the previous iterations in the Rocket series. The vehicle is a two-stage rocket, with the first stage being fueled by RP-1 (a highly-refined form of kerosene) and liquid oxygen, or LOX.

Rocket 3.1 features five first stage engines, which have been named “Delphin” (a dolphin-like Greek sea deity). The engines are arranged in a pentagon pattern, which differs from other five-engine arrangements. Notably, the five engines on the first and second stages of the behemoth Saturn V Moon rocket were arranged in a “quincunx”, or cross formation.

The Delphin engines are powered by electrically-driven turbopumps, similar to the Rutherford engines that are manufactured by Rocket Lab to power their Electron rocket.

Like its predecessor, Rocket 3.1 was designed with simplicity and portability in mind. The simplicity stems from the construction of the rocket’s aluminum fuel tanks, which reduces cost and simplifies the manufacturing process. The portability aspect is shown in the rocket’s size, as it can be easily packed into a standard shipping container for transport to the launch site.

Astra performed two successful static fire tests – quick firings of a rocket’s engines with the intention of testing engine performance before flight – with the Rocket 3.1 vehicle in mid-July 2020. The rocket was subsequently shipped to the PSCA in Alaska for final launch preparations shortly after.

Once there, the rocket was unpacked and integrated onto its launch mount. The company successfully completed a Wet Dress Rehearsal (WDR) with Rocket 3.1 on the pad on July 31, so as to effectively run through the pre-launch countdown and fueling procedures.

Astra is currently targeting the opening of the five-day window for the launch of Rocket 3.1, with T-0 scheduled for 7:00 pm Pacific time on Sunday, August 2 (02:00 UTC on Monday, August 3). The daily launch windows will remain open for two hours each day.

According to Adam London, the co-founder of Astra and the company’s chief technology officer (CTO), Rocket 3.1 will not be carrying any payloads inside its fairing in order to increase performance margins on the vehicle.

This mission will serve as the first iterative attempt for the California-based company to reach orbit. As such, Astra has stated that the outcome of the mission will be determined by the performance of the first stage, with total success being defined as a nominal, full-duration burn.

For the initial launches of Rocket vehicles, Astra will launch out of the Pacific Spaceport Complex in Kodiak, Alaska. From there, the company will be able to reach polar and Sun-synchronous orbits.

Astra’s “Rocket 3.0” vertical on the launch pad at the Pacific Spaceport Complex – credit: DARPA

In addition to Kodiak, Astra plans to activate a second launch site located in the Marshall Islands. This will allow the company to reach low-inclination orbits, thereby allowing for more flexibility for customers who are searching for low-cost transport to LEO.

Astra has over a dozen launch contracts signed, but it is currently unknown as to when – or wherefrom – they will launch.

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