Author Archives: Tom

Skyview V3.1.16: Effelsberg-Bonn HI Survey

We have just released a new version of SkyView which adds the Effelsberg-Bonn HI survey: measuring the HI column density for the entire sky north of -6 declination with unprecedented resolution and sensitivity.   Look for the EBHIS survey in the … Continue reading

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Lanczos Normalization Error

The Lanczos sampler is a truncated version of the optimal sampling function, sinc(x). The kernel of this sampler is given as f(x) = sinc(pi x) sinc(pi x/n)    |x| < n 0    |x| >= n Here x is given in … Continue reading

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Updated Fermi SkyView Surveys.

In the next few days we’ll be updating the Fermi survey datasets. The updates include data through week 379 of the mission (in October). This adds several years of data since we last updated Fermi early in 2012. Unlike the … Continue reading

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SkyView V3.1.13: SkyView-in-a-Jar bug fixes.

We’ve just released new version of SkyView that fixes a couple of bugs associated with using SkyView-in-a-Jar. Users of the web pages should not see any changes. There is a batch mode option in the jar which allows many requests … Continue reading

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V3.1.10: WISE now uses All-WISE data

We’re getting ready to release the next version of SkyView. The only significant change is an update to the WISE datasets which will now point to the All-WISE data release. This provides significantly deeper coverage in some areas and bands … Continue reading

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SkyView v3.1.8 with GALEX DR7 released.

A new version of SkyView, v3.1.8, has been installed as the default version. The significant change from the user perspective is that the GALEX DR7 is included. New data is mostly in the NUV. To access these data through SkyView-in-a-Jar … Continue reading

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GALEX DR7 in SkyView

We’re testing out a new version of SkyView where we’ve upgraded the GALEX survey to include more GR7 data. There are a few minor internal changes. Most of the new data is for the NUV. When we release this survey … Continue reading

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Looking for Moving Targets? Try SkyMorph

One of the restrictions on SkyView is that you need to specify a fixed position in the sky to look at. For many years the SkyView machine has hosted a companion service, SkyMorph, that allows you to look for many … Continue reading

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SkyView and SkyMorph Problems 8/24/2014

SkyView‘s disk area for user-generated images filled up on the morning of August 24 (EDT) and the problem was not corrected until about 9 AM on August 25. SkyView and SkyMorph requests during that time failed. We apologize for any … Continue reading

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Babylon’s Legacy: Converting Decimal to Sexagesimal

It’s usually convenient to store and process angles and times in some simple decimal value, but we often wish to display them in a conventional sexagesimal notation or allow users to enter values that way. So we need to be … Continue reading

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