Astra’s 3.3 rocket, tail number LV0010, is on its launch pad at the Cape Canaveral space force station before launching into NASA’s TROPICS-1 mission. Credit: Brady Kenniston / Astra
Astra is preparing to launch the first of three consecutive dedicated missions for NASA this weekend at Cape Canaveral to deploy six shoe-sized hurricane research satellites, helping to to be a pioneer in a new paradigm of more risky but less expensive scientific missions.
The commercial launch company, targeting the growing small satellite industry, won a $ 7.95 million contract last year to launch NASA’s six TROPICS spacecraft into orbit with three rockets.
The first of three TROPICS missions is ready for takeoff during a two-hour window that will open Sunday at 12:00 EDT (16:00 GMT). Meteorologists predict stormy weather at the launch site, with more than a 50% chance that conditions could prevent takeoff. Conditions are expected to improve on Monday, according to the official weather forecast for the launch.
Astra delivered the rocket to the Florida space coast last month from its California plant, then completed a test run of the engine’s five engines at the Space Launch Complex 46, a commercially operated facility near the easternmost extension of the Cap Canaveral space force station.
The first two TROPICS satellites are mounted inside a deployment at the top of the 43-foot-tall (13.1-meter) Astra launcher, which the company calls Rocket 3.3, or tail number LV0010.
“We’re trying to make improved observations of tropical cyclones,” said William Blackwell, principal investigator of the TROPICS mission at MIT Lincoln Laboratory. “And what we’re really trying to characterize is the fundamental thermodynamic environment around the storm. So it’s things like temperature, the amount of moisture and the intensity of the rainfall, and the structure around the storm.
“These are important variables because they may be related to the intensity of the storm, and even the potential for future intensification,” Blackwell said in an interview with Spaceflight Now on Friday. “So we are trying to make these measurements with a relatively high revision. This is really the new key feature offered by the constellation TROPICS, it is the improvement of the storm revision.
“We will have six satellites in orbit and one satellite will work to make a good picture of the storm, and then the next satellite will orbit near it an hour ago,” Blackwell said. “So, about every hour, we’re going to have a new picture of the storm, and that’s about a factor of five to eight better than we have today. With these new, quickly updated image measurements, we hope this helps us understand better the storm and ultimately lead to a better forecast of the trajectory and intensity of the hurricane. “
TROPICS stands for Time-Resolved Observations of Precipitation structure and Storm Intensity with a Constellation of Smallsats. The mission has a total cost of approximately $ 30 million, according to NASA.
Each TROPICS satellite has a single instrument. A microwave radiometer, the size of a cup of coffee and rotating 30 times per minute, will create images of tropical cyclones, collect temperature measurements, and collect vertical moisture profiles through the atmosphere.
“I love TROPICS, just because it’s a bit of a crazy mission,” said Thomas Zurbuchen, head of NASA’s scientific mission. “Think of six CubeSats doing science, watching tropical storms with a repeat time of 50 minutes.”
“NOAA and the Europeans and many others have been flying with passive microwave radiometers for decades, and these are big, expensive instruments,” Blackwell said. “What we’ve done with TROPICS is to miniaturize electronics to make them much smaller.
“The whole satellite for TROPICS, one of them weighs about 10 pounds and is the size of a loaf of bread,” Blackwell said. “So they’re relatively inexpensive to build and test, and we can do them pretty quickly, and they’re relatively inexpensive to launch.”
The TROPICS satellites were built by Blue Canyon Technologies in Boulder, Colorado. Their small size makes them ideal for the Astra, which can deliver about 110 pounds (50 kilograms) of payload into a 310-mile (500-kilometer) orbit. The Astra rocket is the smallest orbital-class launcher it currently wants.
Astra will launch two TROPIC satellites at the same time, performing flight missions at intervals of several weeks. If all goes well, the releases should be ready by the end of July.
The satellites will orbit 357 miles (550 kilometers) above the Earth, orbiting the planet at an angle of 29.75 degrees to the equator. The low-slope orbit will focus TROPIC observations on hot spots for the development of tropical cyclones.
The second and third TROPICS launches, currently scheduled for late June and mid-July, will aim to deploy the next four satellites in precise orbital planes, giving the constellation adequate space to allow overflights. regular cyclones.
Many CubeSats travel in space on shared travel launches, allowing operators to take advantage of lower costs by grouping their payloads into a single large rocket. But TROPIC satellites need dedicated launches to reach their precise orbital destinations.
“We want to space the spacecraft as much as we can and we want to keep them on the tropical cyclone belt,” Blackwell said. “This general setup allows us to do that, but it requires three separate dedicated launchers.”
Astra outperformed SpaceX, Rocket Lab, Virgin Orbit and Momentus, largely due to its lower-cost proposal, according to NASA.
“NASA selected Astra for our unique ability to reach three different orbital aircraft in a very short period of time, at a low cost,” said Martin Attiq, Astra’s business director. “So being able to launch three different times for $ 8 million is unprecedented.”
Artistic illustration of the constellation satellite TROPICS. Credit: NASA / MIT Lincoln Laboratory
Founded in 2016, Astra aims to finally launch daily missions to bring small satellites into orbit for various customers, including the U.S. military, commercial companies, and NASA. The company has successfully reached orbit in two out of six attempts.
Astra’s most recent flight in March was the first time the company had launched satellites into orbit, following a takeoff from Kodiak Island, Alaska. Astra’s previous launch in February, which left Cape Canaveral, failed to put a payload of NASA-sponsored CubeSats into orbit.
NASA officials are aware of the risk of flying satellites on a new, relatively untested launcher. TROPICS is part of NASA’s Earth Venture program, a series of cost-limit missions designed for Earth science research. NASA assumes more risk for Venture class missions.
“Only four of the spacecraft need to work, so two rockets need to work,” Zurbuchen said. “This is a different level of risk than we do in so many other things that we focus on, we flatten the risk and reduce it as much as we can. And that’s deliberate. It’s deliberate because speed matters when you’re in the game of innovation, and we want new capabilities and new assets and new tools. “
NASA selected TROPICS for development in 2016.
“We designed the mission from the ground up to build some resilience to failure,” Blackwell said. “The choice of six satellites was made to give us some leeway. We only need four to meet our basic requirements, so we can tolerate satellite failures or launch failures, or whatever, and we can still meet our requirements. “
The first launch of Astra with two TROPICS satellites will begin with the ignition of the five kerosene-powered engines of the Rocket 3.3 on platform 46. Delphin engines will drive the launcher off the platform with 32,500 pounds of thrust, fueling the rocket to the east. northeast of Cape Canaveral.
The engine of the first stage is expected to stop three minutes after take-off, followed by the separation of the payload cover of the rocket, which covers the upper stage and the payloads of TROPICS during the ascent by the atmosphere. The rocket reinforcement stage will then be launched to fall into the Atlantic, allowing the upper stage to ignite for five minutes to accelerate to orbital velocity.
The deployment of TROPICS satellites is scheduled at T + plus 8 minutes and 40 seconds, according to a chronology of the mission published by Astra.
The six TROPICAL CubeSats. Credit: Blue Canyon Technologies
Satellites will deploy solar panels to start generating electricity, and ground crews will direct the TROPICS spacecraft through tests and controls.
If all three TROPICS launches land as planned, all satellites should be picked up by August, just in time for the peak of the Atlantic hurricane season, according to Will McCarty. NASA program scientist for the mission. The mission is designed for at least one year of scientific observations.
“We are, of course, very motivated to get the data out as soon as we can because we are in the midst of the Atlantic hurricane season, so there will be a lot of demand for that data,” Blackwell said. .
A search engine satellite for the TROPICS mission was launched last June on a SpaceX shared travel mission and has worked well in orbit, compiling temperature and humidity test measurements over several tropical cyclones, including Hurricane Ida before that touched down in Louisiana.
Experience with TROPICS search satellites builds confidence that all six operating satellites will work, McCarty said.
“Our NASA requirement is to collect scientific data for a year, and we look forward to more time,” Blackwell said. “There are some cases where these CubeSats last three years, or even longer, so we expect it to be much longer than the one-year requirement.”
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