Iran Press/ Sci & Tech: A SpaceX Falcon 9 lifted off at 11:12 a.m. Eastern July 1 from Cape Canaveral’s Space Launch Complex 40. The rocket deployed its payload, the European Space Agency’s Euclid spacecraft, 41 minutes later after placing it on a trajectory to the Earth-sun L-2 Lagrange point. The rocket’s booster, on its second flight after launching the Ax-2 private astronaut mission in May, landed on a droneship in the Atlantic Ocean.
“It was really a fantastic launch,” said ESA Director General Josef Aschbacher at a post-launch briefing. “This is a very important mission for the European Space Agency,” Space News reported.
The two-ton Euclid spacecraft, built by Thales Alenia Space, will spend a month traveling to the L-2 point, 1.5 million kilometers from the Earth in the direction opposite the sun. Once there, it will undergo a two-month commissioning period before beginning its science mission.
Carole Mundell, ESA’s director of science, said that commissioning work includes turning on the two main instruments on the spacecraft and calibrating the data, while also confirming the thermal stability of the system. “The optics are so precise we should have diffraction-limited images, so we want to make sure we are getting that quality of images and that our spectra are as we expect.”
The 1.4-billion-euro ($1.5 billion) mission will spend six years conducting a detailed survey of one-third of the sky using a visible camera and near-infrared spectrometer and photometer. Astronomers will use those observations of millions of galaxies to test the validity of various models for dark matter and dark energy, which together comprise 95% of the universe.
Scientists involved with the mission are optimistic that Euclid’s observations will help them understand the nature of dark matter and dark energy. “It’s a really great time to be a cosmologist,” said Henk Hoekstra, a member of the 2,000-person Euclid Consortium of scientists and engineers who have worked on the mission, during a pre-launch briefing June 30. “The launch of Euclid really changes cosmology into the future.”
Euclid will collect a massive amount of data: an estimated 170 petabytes (one petabyte is 1,000 terabytes) over its planned six-year mission. That will be augmented by complementary surveys by several ground-based telescopes. Nine data centers, eight in Europe and one in the United States, will archive the data.
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