We have just released the latest update to SkyView that now includes an additional optical dataset from the Transiting Exoplanet Survey Satellite (TESS). This survey has covered roughly 90% of the sky in its first two years, aiming for 50 ppm photometric precision on stars with TESS magnitude 9-15. The data are served in HiPS format from CDS and were generated from the TESS FFI images by Ethan Kruse. Below shows the full sky in a mollweide projection, missing only some regions too near the ecliptic.
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SkyView has been updated to v3.5.4 today. This version contains changes to exception handling when submitting a query, i.e. more detailed error messages when requests to remote servers fail and when the requested image size is too large. Sometimes a request to a remote server fails because the remote data source is down, so please check the gray box on the SkyView homepage to verify the availability of that service. As always, please contact us via the feedback form if any issues or bugs are discovered.
Update: The SkyView hardware upgrade has been successfully completed. Thank you for your patience, and please let us know if you encounter any issues or lags with the service through our feedback form.
Update: The SkyView hardware upgrade has been postponed to Wednesday, October 21, at 1pm ET. At that time SkyView will be unavailable for approximately one hour and 15 minutes. We encountered some technical difficulties in transitioning to a new storage system – thank you for your patience!
Update: The SkyView hardware upgrade has been postponed again until some time next week (exact time will be updated soon). At that time SkyView will be unavailable for approximately one hour and 15 minutes. Thank you for your patience!
Update: The SkyView hardware upgrade has been postponed until Monday, October 5, 2020 at 10:30am ET. At that time SkyView will be unavailable for approximately one hour and 15 minutes.
The SkyView website will be unavailable Monday, September 28, 2020 from approximately 12:15pm to 1:30pm as we upgrade our hardware to include newer and faster disks.
SkyView has been updated to v3.5.3 today. This version has changes to the following surveys: GLEAM now includes the Galactic plane data as well as the Magellanic Clouds; and the UKIDSS survey is now using DR11 (previously DR8) and including the hydrogen H_2 line (“1-0S1”) where available.
Bug fixes include: exception handling when requests to remote servers time out; command-line parsing of Planck polarization compound observables (e.g, “planck-030 PI”); a version option for the command line skyview-in-a-jar to see the code version without having to open the jar (just ‘java -jar skyview.jar version’).
SkyView version 3.5.2 is now available for testing. There are two changes to surveys and one to the underlying code. The data for the GLEAM surveys has been updated with substantial improvements in coverage. The problem with the SDSS surveys noted in the prior post is fixed in the associated SkyView-in-a-Jar file everything points to DR9 now.
The code change involves the Spline Sampler. Previously this sampler did nothing special when it encountered a NaN in the input data. It simply used that value. The way the Spline sampler works is that if first computes a grid of spline coefficients and then uses those to interpolate at requested positions. However any arithmetic operation involving a NaN results in a NaN, so if there are NaNs at the edges of an image, they’ll tend to propagate throughout the image.
This is the case for the GB6 radio survey (at least), so if you used the Spline sampler on this survey, nothing was returned — or more precisely an array of NaNs. David Green noted this behavior and we’ve changed how SkyView handles NaNs in splines.
There is now a new setting, SplineNaNs, which you can use in the SkyView Jar. The default — used in Web pages — is SplineNaNs=min. This replaces all NaNs with a value 10% of the total range less than the minimum value. Other options are max, which uses a value 10% greater than the maximum value, skip, which duplicates the prior behavior (i.e., we do nothing to handle the NaNs). Or you can specify a number (other than 1) to use as the value for the NaNs.
We’re still testing v3.5.2 but it should be released in a few days.