Hidden Treasures Competition Instructions
Open the Science Archive query form, and start digging!
1. First challenge: selection of the images
You can restrict the search for a given object (for instance: Target Name = NGC 1313), or for an area around given coordinates. Select some (or all) instruments (for instance, FORS1). Select “On-the-sky exposures” to get actual data. You can further restrict the search for a given time range (the date format is DD MM YYYY, for instance from 15 12 2003 to 17 12 2003), and then click Search. You will get a long list of frames that you can retrieve.
If you followed this example, which is encoded as the default values for the entries in the form, you will have found the files that were used for this image of NGC 1313
You may also retrieve this example dataset just by hitting return on the form.
2. Data retrieval
Once you have identified a series of frames that can constitute a hidden treasure, mark them (little box on the left), and click the “Request” button.
You will then be asked to log onto the ESO User Portal. If you don't have an account already, you will need to create one: follow the link “I would like to create a new account”. This process is very quick, and of course all data provided are treated confidentially).
For the “Profile Category” entry, select “Amateur Astronomer” (unless another category fits you better).
You will receive an email with a link that activates your account.
Select "Instant Download" in the Media Delivery Type. Under Options select "Selected files + associated processed calibrations (if available)". This will let you download all needed callibrations data (like flat field of bias frames) at once.
Once the data are requested, they will be extracted from the Archive, which can take a few minutes up to a few hours. You will then receive an email with the instructions on how to transfer the data.
3. Second challenge: data processing
All the data are stored in FITS format. It is therefore critical that you know how to do the astronomical processing for these files, and that you have software than can do it. If you don't know about this file format or are not interested in finding out more, this competition is probably not for you.
The images all need to be de-biased and flat-fielded. It is then likely you will want to stack several images obtained through the same filter.
4. Third challenge: image combination
You can process the data in any way you want, and combine them as you wish. The end or intermediate results can be enhanced using any technique. The only thing that is strictly forbidden is to paint on the image. Only tiny cosmetic defects can be painted over, such as cosmic rays, bad pixels, satellite trails, etc.
5. Upload the result
Once you have produced an image you are pleased with, save the original file in your working format (for instance .psd for Photoshop, or .xcf for GIMP), and generate a moderately sized JPEG for submission. Keep the original – we shall request it if you are shortlisted for a prize.
In the Group Pools, click "Join" link, then "Join this group".
You need to upload your image to the ESO Hidden Treasures group.
First, upload them on Flickr: click on "You" menu -> Upload photo and videos, then "Chose photos and videos". On next page, make sure you select "Public" in the privacy settings, and hit "upload" –this can take sometime. Write the relevant information in the caption of the image, and save.