Scientists from the James Webb Space Telescope shared the first images from space taken by the new telescope. Since the 18-segment mirror is in the early stages of being aligned, the first image is understandably blurry and a bit jumbled. But its exactly what the team wanted to see.
“The initial results are very similar to our simulations and matches our predictions,” said Lee Feinberg, JWST’s Optical Telescope Element Manager, speaking at a press briefing on February 11, 2021. “We don’t see anything of concern. But this is the first time using the components of the telescope at zero gravity, and the results … shows that the NIRCam (Near Infrared Camera) instrument is an excellent wavefront actuator.”
While the team is not calling these images “first light,” they said the images meant that they have “detected photons from outer space for the first time with the telescope.”
This image mosaic was created by pointing the telescope at a bright, isolated star in the constellation Ursa Major known as HD 84406. This star was chosen specifically because it is easily identifiable and not crowded by other stars of similar brightness, which helps to reduce background confusion. Each dot within the mosaic is labeled by the corresponding primary mirror segment that captured it. These initial results closely match expectations and simulations. Credit: NASA
The first image is a mosaic of 18 images of the same star – one image for each of the unaligned segments. The light from the star was reflected back at Webb’s secondary mirror and into NIRCam’s detectors. The image proves that NIRCam is ready to collect light from celestial objects, and then identify starlight from the same star in each of the 18 primary mirror segments.
Webb scientists assured that the images will become clearer when the mirror segments are aligned to act as one giant 6.5-meter mirror, and also when the telescope and instruments reach their intended operating temperatures. Feinberg said JWST is currently about 60 degrees over the negative 370 degrees Fahrenheit (negative 223 degrees Celsius) optimal operating temperature.
This “selfie” was created using a specialized pupil imaging lens inside of the NIRCam instrument that was designed to take images of the primary mirror segments instead of images of space. This configuration is not used during scientific operations and is used strictly for engineering and alignment purposes. In this case, the bright segment was pointed at a bright star, while the others aren’t currently in the same alignment. This image gave an early indication of the primary mirror alignment to the instrument. Credit: NASA
The second picture is a ‘selfie’ of sorts, showing the mirror segments. It was taken with a special lens within the NIRCam instrument, which is meant for engineering, not science, and allows NIRCam to capture an “inward-looking” image of the primary mirror. While all the mirror segments are seeing starlight, the one segment looks bright because, from NIRCam’s view, the segment is directly aligned with the star. This image allows the team to check that the telescope is aligned with the science instruments.
The star that NIRCam is using to help align the mirror segments is HD 84406, a G-type main sequence star that is a lot like our own Sun, located near the ‘bowl’ of the Big Dipper
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