The #JWST team today released a fascinating infrared image of planet Neptune, its moons and its rings, taken by the NIRCam instrument on July 12.
Let's take a look at other notable images of Neptune taken over the past few decades, by other space and ground based telescopes.
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Few more images of Neptune, taken in visible and infra-red light, by space and ground based telescopes.
No, we cannot see Neptune's rings in these images.
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A comparison of annotated wide-angle images of Neptune and its moons by #JWST and Hubble.
Neptune has 14 known moons, which are named for minor water deities in Greek mythology.
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The dusty rings of Neptune were first imaged by Voyager 2 in 1989, in visible light wavelengths.
Neptune's 5 principal rings are named after astronomers who contributed important work on the planet: Galle, Le Verrier, Lassell, Arago, and Adams.
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1/ Webb turns its eye close to home by capturing its first image of Neptune, revealing the ice giant planet in a whole new light. This is the clearest view of this peculiar planet’s rings in more than 30 years. Read more:
esawebb.org/news/weic2214/
Here is the full sized #JWST image of Neptune. It has a 132"x132" (arcsec) field of view using one of NIRCam's 4kx4k (2kx2k at higher wavelengths) detector modules.
Filters and colors assigned to wavelengths -
Blue: F140M (1.4 μm)
Green: F210M
Orange: F300M
Red: F460M (4.6 μm)
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Here is a cheat sheet of various instruments in #JWST, their field of view angular sizes and the detector sizes.
NIRCam has two 4kx4k pixel detector modules; one was used for this image of Neptune.
Note that 132" (arcsec) is 0.037 degrees.
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Neptune's rings were first discovered in 1984 at La Silla Observatory in Chile.
The 5 rings are named after astronomers Galle, Le Verrier, Lassell, Arago, and Adams.
Neptune's 14 known moons are named after minor water deities in Greek mythology.
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Voyager 2 flew by within 5,000 km of Neptune. The images of the rings were taken after Voyager 2 went past Neptune and looked back at the brightly backlit rings.
JWST imaged the faint rings from over 4.4 billion km away with front lighting. This is JWST's engineering genius.
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Voyager 2 also took up-close images of Neptune's moons, such as Proteus below. Proteus is only about 400 km across. Even a telescope like JWST cannot take such hi-res images from such great distances.
Proteus has an angular size as seen from earth of 0.0000053° or 0.019".
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