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Titan (Webb NIRCam and Keck NIRC-2)
Evolution of clouds on Titan over 30 hours between November 4 and November 6, 2022, as seen by Webb NIRCam (left) and Keck NIRC-2 (right). Titan’s trailing hemisphere seen here is rotating from left (dawn) to right (evening) as seen from Earth and the Sun. Cloud A appears to be rotating into view while Cloud B appears to be either dissipating or moving behind Titan’s limb (around toward the hemisphere facing away from us). Clouds are not long-lasting on Titan or Earth, so those seen on Nov. 4 may not be the same as those seen on Nov. 6. The NIRCam image used the following filters: Blue=F140M (1.40 microns), Green=F150W (1.50 microns), Red=F200W (1.99 microns), Brightness=F210M (2.09 microns). The Keck NIRC-2 image used: Red=He1b (2.06 microns), Green=Kp (2.12 microns), Blue=H2 1-0 (2.13 microns).
About the Data
- Data DescriptionData DescriptionProposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.This image was created with Webb data from proposal 1251 (C. Nixon)
- InstrumentInstrumentThe science instrument used to produce the data.Webb> NIRCam Keck> NIRC-2
- Exposure DatesExposure DatesThe date(s) that the telescope made its observations and the total exposure time.4 Nov 2022, 6 Nov 2022
- FiltersFiltersThe camera filters that were used in the science observations.Left: F140M, F150W, F200W, F210M Right: He 1b, Kp, H2 1-0
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.Titan
- Object DescriptionObject DescriptionThe type of astronomical object.Saturn's moon
- Release DateDecember 1, 2022
- CreditNASA, ESA, CSA, Webb Titan GTO Team; Image Processing: Alyssa Pagan (STScI)
These images are a composite of separate exposures acquired by the James Webb Space Telescope using the NIRCam instrument and the Keck Telescope using the NIRC-2 instrument. Several filters were used to sample different infrared wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: Left> Blue: F140M (1.4 microns), Green: F150W (1.5 microns), Red: F200W (2.0 microns), Luminosity: F210M (2.1 microns) Right> Red: He1b (2.06 microns), Green: Kp (2.12 microns), Blue: H2 1-0 (2.13 microns)
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Laura Betz
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
laura.e.betz@nasa.gov
NASA, ESA, CSA, Webb Titan GTO Team
Alyssa Pagan (STScI)
