Rocket Lab is set to launch its 31st Electron rocket on the “It Argos Up From Here” mission, which will launch from Rocket Lab’s private Launch Complex 1B (LC-1B), on the Mahia Peninsula in New Zealand. Liftoff is currently scheduled for Saturday, Oct. 8 at 6:09 AM NZT (17:09 UTC on Oct. 7).
This launch will mark Rocket Lab’s eighth launch of 2022 and their fourth overall launch from LC-1B – one of Rocket Lab’s three launch pads, which include LC-1A and LC-1B at Mahia, and LC-2 at Wallops in the United States.
The mission name “It Argos Up From Here” is a play on words of the common colloquialism “it’s all downhill from here” and the payload name, Argos-4. The payload consists of a single General Atomics satellite based on their Gazella satellite bus.
This bus will be used to host several experiments for a variety of customers as part of their Hosted Payload Solutions (HoPS) mission and will be part of the Argos worldwide Data Collection System (Argo DCS) – a constellation that collects, processes, and releases environmental data around the world.
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Argos DCS is part of a joint agreement between the National Oceanic and Atmospheric Administration (NOAA) and the French Space Agency’s Centre National d’Etudes Spatiales (CNES). Established in 1978, the Argos satellite constellation currently consists of seven operational satellites, with the oldest having been launched in 1998.
All of these satellites were launched into Sun-synchronous orbits with an altitude of ~850 km. This allows each satellite to view ~5,000 square km at a time and have a period of ~100 minutes.
The largest and primary hosted payload is the Argos-4 Advanced Data Collection System, which will collect data from thousands of sensors from around the globe, and will then be used to monitor wildlife and fishing, maritime security, and non-environmental uses. Additionally, there will be several payloads onboard that will be used to monitor radiation in orbit.
With a planned on-orbit lifespan of five years, the satellite is equipped with two deployable fixed solar arrays and batteries to power the satellite. The mass of the satellite is unknown; however, based on Electron’s performance, the satellite masses no more than 180 kg.
Rocket Lab’s countdown starts six hours before launch when the road to the launch site will be closed, and two hours later, the rocket will be raised vertically and the fueling of Electron’s RP-1 tanks will begin. 90 minutes later, the launch pad personnel will exit the area, clearing the pad so operations can continue without any risk to humans.
At T-2 hours, Electron will begin to be filled with Liquid Oxygen (LOX) in both stages. Also at this time, the notice to mariners will go live, protecting boaters from the vehicle.
At T-30 minutes, the airspace around the vehicle and its ascent corridor will be closed. 12 minutes later, the launch director will perform a go/no-go poll wherein teams will verify that the weather, rocket, ground service equipment, and range are ready to support the launch attempt.
Assuming all teams are go, the vehicle will continue to count down until T-2 minutes, when launch auto-sequence will begin.
All nine Rutherford engines will ignite at T-2 seconds. Each 3D-printed Rutherford engine is electric pump-fed, meaning that instead of utilizing a gas generator or closed-cycle preburner to spin the turbopumps, an electric motor is used. This is possible due to the small size of Electron.
Each engine produces 25 kN of thrust at sea level and 26 kN in a vacuum. The engine’s impulse per unit mass (or Isp) in a vacuum is 343 seconds.
Once all engines are at full thrust and all systems have been checked out, the vehicle will command the launch clamps to release the vehicle, and Electron will shoot off the pad and reach supersonic speeds (Mach 1) at T+56 seconds. 12 seconds later, the vehicle will reach maximum aerodynamic pressure, or Max-Q, which is the point in the flight where aerodynamic loads are at their strongest on Electron.
Two minutes and 23 seconds into the flight, all first-stage engines will shut down, followed shortly after by stage separation and ignition of the second stage’s single vacuum-optimized Rutherford engine. The stages will be separated by a pneumatic stage separation system, similar to SpaceX’s separation system on the Falcon 9 rocket.
At T+2:57, the 1.2-meter diameter carbon fiber composite fairing halves will separate from the vehicle, exposing the payload to the vacuum of space.
At T+6:11, an event unique to the Electron occurs: the second stage ditches half of its batteries in an event known as “battery hot-swap.” This simple hot-swap takes Electron from being able to put negligible mass into LEO to over 300 kg.
The second stage will burn until T+9:08 when the second stage engine will cut off and the kick stage will separate from the second stage. At this point, the second stage will coast for a while, before safely deorbiting in an effort to reduce the amount of “space junk” in Earth orbit.
At T+1:40:11, the kick stage’s Curie engine will ignite for 23 seconds to circularize the orbit to the final 750 km Sun-synchronous orbit. Argos-4 will be deployed at T+1:49:59, completing the mission.
“It Argos Up From Here” will mark the 132nd orbital launch attempt of 2022–a significant increase in the number of orbital launches from previous years.
(Lead image: Electron vertical at LC-1B for “It Argos Up From Here.” Credit: Rocket Lab)
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