Category Archives: Discussion

SkyView V3.2.0: Survey descriptions downloaded on demand

Posted on August 18, 2016 by Tess Jaffe

The biggest change in v3.2.0 of SkyView is that survey description files are no longer part of the SkyView jar. In v3.1.21 we added a small file that retained the mapping between survey names and the description files they referred … Continue reading →

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SkyView v3.2.0: Some survey data removed from jar

Posted on August 18, 2016 by Tess Jaffe

SkyView-in-a-Jar users will note that the new v3.2.0 SkyView jar is much smaller than the earlier versions, under 4 megabytes compared to over 15 megabytes for v3.1.21. Part of the reason is that the way we access some older surveys … Continue reading →

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IRAS image of Saturn

Posted on May 11, 2016 by Carina Kan

We have had a lot of interest in images centered on coordinates 13h 45m 18.2s, -08d 13m 07s recently.  SkyView images of this area in the sky using the Infrared Astronomical Satellite (IRAS) survey are often added to the SkyView Image … Continue reading →

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Lanczos Normalization Error

Posted on February 4, 2016 by Tess Jaffe

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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SkyView V3.1.14: VLA FIRST (1.4 GHz) survey update

Posted on June 30, 2015 by Carina Kan

SkyView version 3.1.14 has been released with a change that affects FIRST survey images. It was brought to our attention that some FIRST images generated using SkyView differed from images generated via the FIRST web server. We investigated and found … Continue reading →

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V3.1.10: WISE now uses All-WISE data

Posted on December 2, 2014 by Tess Jaffe

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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Looking for Moving Targets? Try SkyMorph

Posted on August 26, 2014 by Tess Jaffe

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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Babylon’s Legacy: Converting Decimal to Sexagesimal

Posted on July 24, 2014 by Tess Jaffe

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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V3.1.7: SkyView and Google Analytics

Posted on July 16, 2014 by Tess Jaffe

Today we will be releasing version 3.1.7 of SkyView. There are no changes to the user code, but the primary pages will now be instrumented so that usage will be tracked through Google Analytics. This implements the NASA general policy … Continue reading →

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V3.1.6: RGB Images Bug Fix

Posted on July 14, 2014 by Tess Jaffe

The survey descriptions for a number of our surveys (notably including some of the DSS surveys and the IRAS and IRIS surveys) had an error in them that made it impossible to create RGB images if one of the affected … Continue reading →

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