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Back to Stars index
Go to the Explore tool (link
opens in new window). From the astronomers' main page, look under Advanced Tools. From the public
main page, look under SkyServer Tools, then Explore. From the Explore introduction page,
click on the link that says Click here to Explore!. Click on ObjID under the Search label in the top left corner of the tool. A small
window will pop up with a place to enter an SDSS Object ID (Objid). Enter the object ID of the first observation of the star you want to see, which is labeled
objid in your search results. Click OK. A new window will pop up with the Explore tool entry for the first observation of the star. Its
magnitudes are labeled as u, g, r, i, and z. To see more observations of the star, click on More Observations, under the PhotoObj
label in the left-hand column. The tool now shows other observations of the same object. Each of the links listed under objId is a link to another observation of the same star.
Click on the link to go to the Explore page for the new observation of the star. The best observation of
the star is known as the primary observation; the others are known as the
secondary observations. If you want to know when the observation was made, look for its Modified Julian Date (MJD)
in the SDSS data. Click on Field, then look for mjd_u, mjd_g, and the mjd for the
other wavelengths.
Note: when you run the query from the last page in the SQL search tool without the "top 100", it will
probably time out. To get all results, you will should use CasJobs
(link opens in new window). See the CasJobs help page for
more information.
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