James Webb Space Telescope optical alignment is “perfect,” NASA says
Four and quarter months after James Webb’s Christmas Day launch, engineers have made significant progress towards the near-perfect alignment of its complex optical system. They are working on final calibrations for the instrument and releasing the first photos of the science show in July, as per the officials on Monday.
“I’m happy to share that alignment for the telescope has been achieved far more impressive than we could have thought possible,” said Michael McElwain, Webb project scientist at NASA’s Goddard Space Flight Center.
“We have essentially made a perfect alignment for the telescope. There’s no adjustment in the telescope’s optics that would improve our scientific capabilities. “
In April, there were images released showing sharp stars. Then, on Monday, a brand new image was released that revealed two views of a field of stars within the Large Magellanic Cloud, a satellite galaxy that forms an integral part of the Milky Way. One image was captured using the smaller, now obsolete Spitzer Space Telescope, while the other was captured by Webb’s Mid Infrared Instrument, MIRI.
Its Spitzer image shows blurred stars with indications of Nebulosity. However, Webb’s view displays crystal-clear stars that are crystal clear and precise and clear filaments and clouds that cover the entire field of the idea.
“From the conceptual view, you’ll see that images taken from Webb will be superior because Webb is a collection of (mirror) segments. Each segment is larger than the segment used to make mirrors to the Spitzer telescope’s mirror,” said Marcia Rieke, principal investigator of Webb’s Near-Infrared Camera, or NICAM.
“It’s it only once you experience the kind of image it produces that you can truly take in the picture and marvel at the possibilities we’re about to uncover! Spitzer gave us many lessons, but this is Spitzer’s complete universe. Amazing. “
Scientists and engineers will spend the next two months reviewing and analyzing the four instruments that comprise Webb’s science, gathering test images and spectra for them to try 17 operation methods before beginning “Cycle 1” observations in the field of science this summer.
In the beginning, the team will unveil the first in an array consisting of “early release observations,” that are also referred to as EROs. They’re jaw-dropping photos of unique cosmic objects that will demonstrate Webb’s expertise in science, which will, in turn, aid in justifying the price of $10 billion.
The list of potential targets is a closely kept secret, but NASA will release the selected ERO images and spectrum by July.
“They aim to demonstrate … it to the entire world population and for the public that Webb operates and is capable of delivering exceptional results,” said Klaus Pontoppidan, Webb project scientist at the Space Telescope Science Institute in Baltimore. “It’s also a chance to celebrate the beginning of a long time in Webb’s research. “
The official added that the chosen targets, made by a team of experts, will showcase the four instruments utilized in the field of science “to draw attention to the entirety of Webb science-related topics … beginning from the very beginning of the universe, through galaxies through time, and through the lives of other planets and stars. “
Webb was designed to capture small amounts of light from the initial generation of galaxies and stars formed after the Big Bang 13.8 billion years ago. The light was extended to the infrared region of the spectrum due to the expansion of space itself.
To get to its sharp, razor-sharp Webb’s secondary mirror and all 18 hexagonal sections of the 21.3-foot-wide primary mirror, each of which has ultra-precision tilt actuators that have to be aligned with nanometer precision, an iterative procedure that successfully combined 18 beams reflecting on forming one single point.
Computer, enhance! Compare the same target — seen by Spitzer & in Webb’s calibration images. Spitzer, NASA's first infrared Great Observatory, led the way for Webb’s larger primary mirror & improved detectors to see the infrared sky with even more clarity: https://t.co/dIqEpp8hVi pic.twitter.com/g941Ug2rJ8— NASA Webb Telescope (@NASAWebb) May 9, 2022
Webb has to operate within a few degrees of absolute zero to detect the infrared light extended from the galaxy’s first stellar bodies. This is accomplished by an ungainly sunshade of 5 layers quickly installed following the launch.
Since then, the mirrors and instruments have been chilled to about 300 degrees over zero°F. Additionally, MIRI has an advanced “cryo-cooler” to boost the ability of MIRI to detect distant wavelengths. The temperature has reached 449 degrees which are just 6 degrees more than the value at zero.
“Overall, this observatory’s performance has been amazing,” McElwain said. “We’re moving closer to the goal. We’re currently setting up and calibrating the observatory, as well as the instruments that are used for science.
“From my perspective, there are always risks to be aware of; however, I’m confident that we’ll make it to the end of this journey and be on a unique scientific mission that will result in massive discoveries in the coming days. Therefore, I’m thrilled to be exactly where I am. “
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