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    NASA's Roman telescope reportedly activates its main camera and detects first starlight

    A September 16, 2026 post says Roman switched on its 300-megapixel infrared camera while traveling toward Sun–Earth L2. It also reports completion of the Coronagraph Instrument's first major checkout.

    Erika E
    1 Source, 28d ago, first seen 28d ago

    TLDR

    A September 16, 2026 post says NASA activated the Roman Space Telescope's Wide Field Instrument and detected its first photons of starlight. The post describes the initial test image as deliberately out of focus. It says the 300-megapixel infrared camera is designed to capture a patch of sky larger than the apparent full Moon in one exposure, with image sharpness comparable to Hubble. The account also reports that Roman completed the first major checkout of its Coronagraph Instrument while heading toward Sun–Earth L2.

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    Credit: NASA

    1 Source

    Erika @ExploreCosmos_NASA has reached an important commissioning milestone with the @NASARoman, successfully activating its main science instrument, the Wide Field Instrument (WFI), while also completing the first major checkout of the Coronagraph Instrument. These tests are taking place as Roman continues its journey toward the Sun-Earth L2 point and are part of the process of preparing the observatory for science operations. The WFI is a 300-megapixel infrared camera designed to combine a very large field of view with high angular resolution. A single Roman exposure will cover an area of sky larger than the apparent size of the full Moon while retaining image sharpness comparable to Hubble. This combination will allow Roman to survey enormous numbers of galaxies and stars, map the distribution of matter on cosmological scales, investigate dark energy and study exoplanets. Before switching the WFI on, engineers allowed the instrument to remain relatively warm so residual water and contaminants could escape. Its detectors were then cooled before Roman’s 18 infrared detectors were activated. The team also powered up the internal calibration system, tested the element wheel containing filters and prisms, and successfully checked the focus mechanism as the detectors continued cooling toward their final operating temperature of about -183 °C. Roman has already detected its first photons of starlight with the WFI. The initial test image is deliberately out of focus because the detector assembly remains in its launch configuration and the telescope has not yet been fully focused. Stars appear as broad, donut-like structures spread over thousands of pixels, exactly as expected at this stage. These observations provide a baseline for aligning the optics and refining the focus. The fine-guidance system will also soon be activated, allowing Roman to lock accurately onto astronomical targets. NASA says the WFI is functioning as expected, and the mission remains on schedule for its first science images in early 2027. At the same time, engineers have carried out an initial checkout of Roman’s Coronagraph Instrument. Unlike the WFI, the coronagraph is primarily a technology demonstration intended to test advanced techniques for directly imaging exoplanets. It combines masks, filters, sensors and deformable mirrors to suppress the overwhelming light from a star so that the much fainter reflected light from nearby planets can potentially be detected. The team confirmed that its cameras, mechanisms, thermal-control systems and avionics are responding correctly. The coronagraph’s thermal system is also functioning properly, bringing most of the instrument to an operating temperature of about 22 °C. It has now entered a roughly 30-day decontamination period, during which its detectors are kept warm enough for traces of water and other volatile substances to leave their surfaces before further calibration. Together, these tests show that Roman’s two principal observing systems survived launch and are responding correctly in space. The next stages will involve more precise calibration, optical alignment, focusing and guidance tests before the telescope begins the wide-field infrared surveys and high-contrast observations for which it was designed.28d
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    NASAWide Field Instrument

    1 Source

    Erika @ExploreCosmos_NASA has reached an important commissioning milestone with the @NASARoman, successfully activating its main science instrument, the Wide Field Instrument (WFI), while also completing the first major checkout of the Coronagraph Instrument. These tests are taking place as Roman continues its journey toward the Sun-Earth L2 point and are part of the process of preparing the observatory for science operations. The WFI is a 300-megapixel infrared camera designed to combine a very large field of view with high angular resolution. A single Roman exposure will cover an area of sky larger than the apparent size of the full Moon while retaining image sharpness comparable to Hubble. This combination will allow Roman to survey enormous numbers of galaxies and stars, map the distribution of matter on cosmological scales, investigate dark energy and study exoplanets. Before switching the WFI on, engineers allowed the instrument to remain relatively warm so residual water and contaminants could escape. Its detectors were then cooled before Roman’s 18 infrared detectors were activated. The team also powered up the internal calibration system, tested the element wheel containing filters and prisms, and successfully checked the focus mechanism as the detectors continued cooling toward their final operating temperature of about -183 °C. Roman has already detected its first photons of starlight with the WFI. The initial test image is deliberately out of focus because the detector assembly remains in its launch configuration and the telescope has not yet been fully focused. Stars appear as broad, donut-like structures spread over thousands of pixels, exactly as expected at this stage. These observations provide a baseline for aligning the optics and refining the focus. The fine-guidance system will also soon be activated, allowing Roman to lock accurately onto astronomical targets. NASA says the WFI is functioning as expected, and the mission remains on schedule for its first science images in early 2027. At the same time, engineers have carried out an initial checkout of Roman’s Coronagraph Instrument. Unlike the WFI, the coronagraph is primarily a technology demonstration intended to test advanced techniques for directly imaging exoplanets. It combines masks, filters, sensors and deformable mirrors to suppress the overwhelming light from a star so that the much fainter reflected light from nearby planets can potentially be detected. The team confirmed that its cameras, mechanisms, thermal-control systems and avionics are responding correctly. The coronagraph’s thermal system is also functioning properly, bringing most of the instrument to an operating temperature of about 22 °C. It has now entered a roughly 30-day decontamination period, during which its detectors are kept warm enough for traces of water and other volatile substances to leave their surfaces before further calibration. Together, these tests show that Roman’s two principal observing systems survived launch and are responding correctly in space. The next stages will involve more precise calibration, optical alignment, focusing and guidance tests before the telescope begins the wide-field infrared surveys and high-contrast observations for which it was designed.28d
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