Compass and Scale Image for Comet ISON
At the time of the Hubble observations on May 8, 2013, the comet was 3.8 astronomical units (354 million miles) from the Sun. The comet was 4.3 astronomical units (403 million miles) from Earth.
The image was created from Hubble data from proposal 13229 by the Hubble Heritage Team, PI: Z. Levay, M. Mutchler, C. Christian, L. Frattare, W. Januszewski, M. Livio, J. Mack, and J. Sokol (STScI/AURA), and K. Noll (NASA/GSFC). High-level science products for these data are available from the MAST archive.
F350LP (long pass)
This image was originally black and white and recorded only overall brightness. These brightness values were translated into a range of bluish hues. Such color "maps" can be useful in helping to distinguish subtly varying brightness in an image.