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More from @ESA_Webb

ESA Webb Telescope

@ESA_Webb

Apr 23

@HUBBLE_space

#BFFinSpace As @HUBBLE_space celebrates its 32nd year of operations, here are some captivating facts about the observatory’s achievements and impact 👇
📷 @esa

@HUBBLE_space

@HUBBLE_space @esa 🔴 Launched on 24 April 1990, the NASA/ESA Hubble Space Telescope has made more than 1.5 million observations of about 50 000 celestial objects 👇

@HUBBLE_space

@HUBBLE_space @esa 🔴 Astronomers using Hubble data have published more than 19 000 scientific papers, with more than 1000 of those papers published in 2021 👇

Read 5 tweets

ESA Webb Telescope

@ESA_Webb

Feb 11

1/ 📢 This is an image mosaic of 18 randomly organised dots of starlight, the product of #Webb 's unaligned mirror segments all reflecting light from the same star back at Webb's secondary mirror and into #NIRCam's detectors. Thread 👇 with a surprise at the end!

2/ The mosaic was created by pointing the telescope at a bright, isolated star in the constellation Ursa Major known as HD 84406, chosen specifically because it's easily identifiable and not crowded by other stars of similar brightness, which helps to reduce background confusion

3/ Each dot within the mosaic is labeled by the corresponding primary mirror segment that captured it. These initial results closely match expectations and simulations.

Read 12 tweets

ESA Webb Telescope

@ESA_Webb

Feb 2

Taking #Webb's temperature 🌡️ 5 new temperature monitoring points have been added to the NASA website to track cooling and status of the instruments during the post L2 arrival commissioning process. Let's have a look at them 👇

1/ Temperature control is a vital aspect of #Webb 's design, engineering and operations. On the page you can see 2 "hot side" and 2 "cold side" temperatures and a set of bellweather instrument temperatures

2/ The instruments are located within the Integrated Science Instrument Module and the Fine Steering Mirror is located within the protrusion in the center of the primary mirror

Read 7 tweets

ESA Webb Telescope

@ESA_Webb

Jan 31

Some of you asked recently why are #Webb's mirrors hexagonal? Thread 👇
📷 NASA/Chris Gunn

1/ The hexagonal shape enables a roughly circular, segmented mirror with "high filling factor and six-fold symmetry." High filling factor just means the segments fit together without gaps, which would not be the case if the segments were circular

2/ Symmetry is good because only 3 different optical prescriptions (A, B and C) are needed for 18 segments, 6 of each as seen below 📷 NASA

Read 4 tweets

ESA Webb Telescope

@ESA_Webb

Jan 30

As #Webb is going through the focusing of its mirrors, let's look into what this process entails. #WebbSeesFarther 👇

1/ #Webb's 18 hexagonal mirrors have already been unfolded a while back, but now it's time for a more precise alignment so they point in exactly the same direction 🎯 and deliver sharp images.
📷 NASA/Chris Gunn

2/ These corrections are made through a process called 〰️ wavefront sensing and control, which senses and corrects any errors in the telescope's optics, aligning the mirrors to within tens of nanometres

Read 8 tweets

ESA Webb Telescope

@ESA_Webb

Jan 24

1/ While we wait for news on L2 orbit insertion, we've got some facts for you on #Webb's orbit 👇

@Hubble_Space

2/ Unlike @Hubble_Space #Webb will not be in orbit around the Earth, but will orbit the Sun, 1.5 million km away from the 🌍 at what is called the second Lagrange point or L2.

3/ This orbit lets the telescope stay in line with the Earth as it moves around the Sun. This allows the satellite's large sunshield to protect the telescope from the light and heat of the Sun, Earth and Moon.

Read 16 tweets

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