Category Archives: Discussion

RGB Image Overlays using SkyView clients

SkyView provides two ways to generate images on local machines – the java based SkyView-in-a-Jar application and the Perl based skvbatch program. Most tasks are straight forward using either client. java -jar skyview.jar Position=m101  survey=DSS Return=jpg size=.25 Pixels=500 output=java_out skvbatch … Continue reading

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Features in the Gallery: Saturn

This recently submitted image looks nothing like the ringed planet Saturn we all know and love. It turns out that there is a planetary nebula named the Saturn Nebula.  SkyView displays images of objects outside our solar system so when … Continue reading

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Features in the Gallery: Color

There has been a whole series of beautiful color images posted to the Gallery recently. Some one (or ones) has been using SkyView‘s RGB capabilities to combine data from multiple surveys into color images. This first image of the center … Continue reading

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Java for SkyView-in-a-Jar

Every now and then we receive emails from SkyView users reporting problems running the SkyView-in-a-Jar application (skyview.jar) on a local machine. Most of the time the problems are due to a mismatched version of java being used to run the … Continue reading

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Features in the Gallery: Sometimes you can do better

The image from 2009-04-20 01:54:28 shows a typical IRAS 100 micron image: There’s a very detectable pattern of lines crossing the image from top left to bottom right. These are remnants of the scan lines used in taking the data. … Continue reading

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Features in the Gallery: Space Frisbees?

This image from 2009-04-27 22:10:22 seems to show a lot of disks in the sky. What’s going on here? The image is taken from the ROSAT pointed observations. The ROSAT mission comprised two phases. In an initial phase the satellite … Continue reading

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Long time, no see

SkyView development has been slowed by a concentration on some other work at the HEASARC, notably a new version of our main archive interface. However next week we’ll be releasing a new version which includes the HEALPix and WMAP data … Continue reading

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Constellations in SkyView

One of astronomy’s primary links to the past are the constellations. We’ve just added a set of overlay files that you can use with SkyView’s standalone package to draw constellation boundaries over an image. You can download individual constellation files, … Continue reading

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Clipping the edges

The Clip sampler is useful when users want to exactly preserve flux or to significantly undersample the data. Basically you can think of it as overlaying the new coordinate pixel grid on top of the old pixel grid and integrating … Continue reading

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Where are people interested in?

Occasionally we go back and take a look at where people have asked for images from SkyView. The following image gives the distribution of SkyView requests as a simple Cartesian (RA,Dec) map. The Galactic plane is very prominent, and even … Continue reading

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