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Here’s our first good look at Comet (C/2012 S1) ISON. The Hubble Space Telescope captured this shot on April 10, when the comet was slightly closer than Jupiter’s orbit at a distance of 634 million kilometers (394 million miles) from Earth. Later this year, this comet could become a brilliant object in the sky, perhaps 10 times brighter than Venus.
The comet’s dusty coma, or head of the comet, is approximately 5,000 km (3,100 miles) across, or 1.2 times the width of Australia. A dust tail extends more than 92,000 km (57,000 miles), far beyond Hubble’s field of view.
Originally posted by ngchunter
Someone's had their hand in the cookie jar again. F606W is the broadband V filter, it's actually just a greyscale image. Someone added the blue color in post processing to make it look prettier. Interestingly, they did use a blue color filter for some of the shots, but they don't mention that in the heading of the photo, just the F606W filter (they didn't use any other filters). I only used the 272 second exposure F606W images in my processing of the data as well; the blue filtered images are much dimmer than the broadband filtered images and I wasn't sure it wouldn't degrade the signal/noise ratio (double negative, I know).
www.abovetopsecret.com...
I wonder now if I added those blue filtered images as just a chromatic blue channel and left the red and green channels blank with the V filtered image as luminance what I might get as a result. I might have to revisit this data.edit on 23-4-2013 by ngchunter because: (no reason given)
This image was taken in visible light. The blue false color was added to bring out details in the comet structure.
Originally posted by MariaLida
Here is some two animations from Hubble's images of the comet ISON C/2012 S1 ..
h.dropcanvas.com...
h.dropcanvas.com...
Originally posted by ngchunter
Originally posted by MariaLida
Here is some two animations from Hubble's images of the comet ISON C/2012 S1 ..
h.dropcanvas.com...
h.dropcanvas.com...
I know you probably didn't know it was me because I go by a different screen name at the place where you found those, but those are actually my work. I don't mind you re-posting them, but please give me credit when you do.
Originally posted by MariaLida
Yap NASA
This image was taken in visible light. The blue false color was added to bring out details in the comet structure.
www.nasa.gov...edit on 23-4-2013 by MariaLida because: (no reason given)
Originally posted by Aqualung2012
Blue Star if I ever saw one...
2nd
Originally posted by Aqualung2012
reply to post by DarknStormy
Really? I don't think anybody thinks that.
Originally posted by Aqualung2012
Blue Star if I ever saw one...
2nd