CFHT Nānā ao All-Sky Images
Nānā ao (lit. "Cloud Watcher") is an instrument designed to provide
all-sky images in both the optical and infrared.
It also produces 'difference' images that reveal changes in the sky. Details are below.
Nānā ao operates between sunset and sunrise, Hawaii Standard Time (UTC-10).
For information on how to directly access Nānā ao images and numerical data,
see the
Nānā ao Data Access page.
Images on this page update every 60 seconds.
The page will automatically refresh when a new image is available.
Weather data updates every 10 seconds.
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Mosaic |
Difference |
Infrared |
Visible |
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Nānā ao has two cameras, an optical monochromatic camera, and an
infrared camera. Both cameras are fitted with 'fish-eye' lenses to capture >90% of the night sky.
The difference image is produced by subtracting the previous infrared image from the current infrared image.
This reveals changes in the sky, such as the movement of clouds. The mosaic image is a composite image that combines the
three individual images (difference, optical, and infrared) into a single view with some image metadata overlayed. The timestamp
on the image reflects the time that the image was taken. The dashed circle on the mosaic images denotes the two airmass line.
For information on how to directly access Nānā ao images and numerical data,
see the
Nānā ao Data Access page.
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Additional views of the night sky are available in our low-light CloudCams!
They are specially designed to provide color images the beautiful Maunakea sky on even the darkest of nights.
Find them on the CFHT CloudCams page.
Also available is our StarCam, a 4K 24/7 video livestream!
This stream is available through Youtube
and provides a view of the western sky day and night.
Find it on the CFHT-Asahi StarCam page.
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Nānā ao All-Sky Images Copyright © Canada France Hawaii Telescope Corporation.
Permission is granted to copy, distribute and/or modify these images under the terms of the GNU Free Documentation License,
Version 1.3, or any later version, published by the Free Software Foundation.
A copy of the license can be found here.
For inquiries, contact info@cfht.hawaii.edu
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