Originally posted by DJW001
reply to post by jonnynature
I was just looking at the constellation of Leo (where Elenin is supposed to be right now) on Google Sky, then I clicked on the "Infrared"
button and this huge object appeared.
Could someone please explain this:
Google sky is not in real time. I see several candidates for the object in the IRAS catalog, but my eyes just aren't good enough to narrow it
down
It's CW Leonis, a carbon star that happens to be one of the brightest stars in infrared in the night sky (it's the brightest infrared star other than
the sun at 5 um wavelength). The image comes from the IRAS all-sky survey, so the actual date the image was recorded was in 1983. Google created
their panoramic using IRAS data in 2007, hence the copyright date. The image itself is much older than that, and it is still in the same place in
other more recent infrared sky surveys.
To see for yourself, go here:
skyview.gsfc.nasa.gov...
Type in "CW Leonis" in the "coordinates or source" box and then shift-select all the images from the infrared sky surveys 2mass, iris, and iras.
2MASS shows a very bright star at those coordinates, getting brighter as wavelength gets longer (do note, 2MASS images have much smaller fields of
view than IRAS but the coordinates are the same). The IRIS images are simply a reprocessing of the original IRAS images, and you can see that's where
google drew their images from as you can see the one that has the "black sphere" halo surrounding cw leonis. This is a processing artifact not
present in the original IRAS images below it. If I remember correctly, microsoft WWT offers the original IRAS images and therefore does not have this
artifact. In summary, this is why you always get the raw images from the original sources when doing research, you don't rely on google sky and other
recompressed, stitched, second-hand sources.
edit on 20-6-2011 by ngchunter because: (no reason given)