Scale in ArcSeconds?

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Re: Scale in ArcSeconds?

by Chris Peterson » Wed Mar 02, 2011 5:26 pm

DavidBartlett wrote:Thank you Chris. Is there a standard pixel scale for the Hubble Advanced Camera for Surveys?
For the WCS, the plate scale is 0.05 arcsec/pixel. You have to be careful with released images, and those published on APOD, since they are sometimes resampled to different resolutions. Don't automatically assume you are seeing an image at the native resolution of the camera.

Re: Scale in ArcSeconds?

by DavidBartlett » Wed Mar 02, 2011 5:08 pm

Thank you Chris. Is there a standard pixel scale for the Hubble Advanced Camera for Surveys?

Re: Scale in ArcSeconds?

by Chris Peterson » Tue Mar 01, 2011 4:55 pm

DavidBartlett wrote:Is there any way that I can find the scale in ArcSeconds directly on the Picture for the APOD?
Generally not. If you know the sensor details and the focal length of the lens, you can calculate the pixel scale. Those things can be found in the EXIF header if the image was made with a digital camera, and if the header was preserved. For most astronomical images, you usually need to perform a plate solve to recover the pixel scale, although this information is occasionally provided in the caption or in linked data.

Scale in ArcSeconds?

by DavidBartlett » Tue Mar 01, 2011 4:30 pm

Is there any way that I can find the scale in ArcSeconds directly on the Picture for the APOD?

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