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Here are a few things you might like to know about the images you see in

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Disk Detective. The red crosshairs are 2.1

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arcseconds across. The red circle is

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10.5 arcseconds in radius. The whole Disk Detective

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image is 60 arcseconds across. An

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arcsecond is about the size of a dime seen from a mile away.

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For example: the angular diameter of the planet Neptune as

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seen from Earth is about 150 arcseconds.

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In these images, the bright objects appear white

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or light blue. The empty sky around them

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appears black or a mottled black-and-blue pattern.

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That mottling is noise. You'll want to focus your

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attention on the white and light-blue areas. At

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Disk Detective, we find new disks by looking at the object

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in images taken with several different telescopes. The images are

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arranged in a flip book, which you can play by clicking on the play button on the lower left.

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A good candidate is small and round

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and mostly contained within the red circle--like this object.

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Sometimes bright objects, like this one on the left,

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can have diffraction spikes that stick out beyond the red circle. These can

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also be good candidates. We're not as interested in objects that are

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outside the red circle, but if you like you can click on

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the icon in the upper right and discuss them on talk.

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Here on the talk page, you can see the image ID

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in the upper-left-hand corner. You can also click on the

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collect button to favorite your image, to start a collection of your

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favorite images. You can type your own comments

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into the blue box, and you can read comments that

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other people have written. SED stands

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for Spectral Energy Distribution. That's a plot

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of how bright this object is in each of the infrared wavelengths

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that you saw in the flip book. Looking at SEDs

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can help us figure out whether the object is really a star with a disk

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or whether it's some other kind object, maybe a galaxy.

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Click on the "More info in SIMBAD" button to access a powerful

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database of astronomical objects. This

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line in SIMBAD tells you the angular distance in arcseconds

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between the Disk Detective object and this SIMBAD object

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to help you make sure you are looking at the right thing. SIMBAD is a great

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resource, but doesn't have information on every Disk Detective

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object. Also, SIMBAD is sometimes wrong, so don't

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discount an object just because SIMBAD has labeled it as a quasar,

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like this one. If you use a

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hashtag in your comments, people will be able to find your comments easily

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by searching for that hashtag. After you've watched the flip book

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at least once, you can select the classification of this object

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by clicking on the rectangles. This looks like a good candidate

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since it looks round, and fairly concentrated, so I'll click "None

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of the Above/Good Candidate" Then I'll click on the

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"Finish" button to record my classification.

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If you've gotten this far, congratulations, you've just classified

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an object. Thank you for helping NASA find new planetary

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systems.

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