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Roman Space Telescope mission preparations

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The Roman Space Telescope is currently traveling to its operational orbit a million miles from Earth.From: Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent

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By 23:56 UTC on October 17, NASA engineers had successfully aligned the Nancy Grace Roman Space Telescope's mirrors, achieving an optical wavefront error of 63 nanometers RMS for the Wide Field Instrument. The adjustment of the secondary mirror by one-sixteenth the width of a human hair allowed the telescope to beat its 90-nanometer requirement by 30 percent.

This microscopic alignment ensures the primary instrument will deliver sharper images than initially predicted for its upcoming dark matter and dark energy surveys. The observatory's Coronagraph Instrument was also confirmed to meet expectations on October 17.

How the story developed

On August 26, the Nancy Grace Roman Space Telescope passed its final Flight Readiness Review. The flagship observatory was sealed inside a SpaceX Falcon Heavy rocket, cleared for an August 30 launch to the Sun-Earth Lagrange Point 2.

The telescope features a 2.4-meter mirror identical in size to Hubble's, but it captures a panoramic field of view 100 times larger. The observatory was built for a five-year primary mission to map the universe's expansion, track dark matter, map dark energy, and conduct a massive census to search for up to 200,000 exoplanets.

The Wide Field Instrument's optical error is 30 percent lower than the mission's baseline requirement.From: Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent ·

The spacecraft carries an experimental coronagraph to test new starlight-blocking technology for directly imaging distant worlds. The instrument uses active deformable mirrors to block a host star's glare, allowing the faint light of orbiting planets to become visible. This technology demonstration lays the groundwork for future flagship missions designed to search for biosignatures on Earth-like exoplanets.

On September 22, the coronagraph captured its first cosmic light during an exoplanet imaging test. The instrument observed a star in the Large Magellanic Cloud, proving it could achieve extreme pointing stability.

Roman's Wide Field Instrument can survey the sky up to 1,000 times faster than the Hubble Space Telescope.From: Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent ·

During the September 22 observation, the telescope's fine-guidance system held the observatory steady to within 1/100,000th of a degree. This stability is equivalent to aiming a laser at a dime from 150 miles away.

What to watch

  • The Coronagraph Instrument will begin starlight-blocking tests in the coming weeks.

Key numbers

100x
Field of view compared to Hubble
2.4 meters
Primary mirror diameter
200,000
Projected exoplanet discoveries
1 million miles
Distance to L2 orbit destination

From: NASA's Roman Space Telescope Cleared for Launch, Set to Begin New Era of Dark Energy and Exoplanet Mapping

Charts, maps and images

A coronagraph uses masks and active mirrors to suppress a host star's glare.From: NASA's Roman Space Telescope Coronagraph Captures First Light in Crucial Exoplanet Imaging Test ·
Roman features the same size mirror as Hubble but captures a field of view 100 times larger.From: NASA's Roman Space Telescope Cleared for Launch, Set to Begin New Era of Dark Energy and Exoplanet Mapping ·
The experimental Coronagraph Instrument uses deformable mirrors to block starlight, revealing faint exoplanets.From: NASA's Roman Space Telescope Cleared for Launch, Set to Begin New Era of Dark Energy and Exoplanet Mapping ·
Engineers installed the telescope's primary and secondary mirrors with high precision before launch.From: Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent ·
The L2 Lagrange point offers a thermally stable environment that prevents the telescope's optics from warping.From: Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent ·
Engineers at Caltech's IPAC facility monitor telemetry during the coronagraph's first light observation.From: NASA's Roman Space Telescope Coronagraph Captures First Light in Crucial Exoplanet Imaging Test ·
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The coronagraph's first targets included dense stellar fields in the Large Magellanic Cloud.From: NASA's Roman Space Telescope Coronagraph Captures First Light in Crucial Exoplanet Imaging Test ·
A SpaceX Falcon Heavy rocket will carry the 4.2-metric-ton observatory to the Sun-Earth Lagrange Point 2.From: NASA's Roman Space Telescope Cleared for Launch, Set to Begin New Era of Dark Energy and Exoplanet Mapping ·

Timeline

October 2026

  1. Roman Space Telescope's Wide Field Camera Beats Optical Targets by 30 Percent
  2. NASA's Roman Space Telescope Coronagraph Captures First Light in Crucial Exoplanet Imaging Test

August 2026

  1. NASA's Roman Space Telescope Cleared for Launch, Set to Begin New Era of Dark Energy and Exoplanet Mapping