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comet ISON UPDATE, Latest Images. Red Aurora/Both Poles. 4 oct 2013

October 6, 2013

comet ISON UPDATE, Latest Images. Red Aurora/Both Poles. 4 oct 2013

ytn otes

Oct 4, 2013
ISON’s Path and Sunday Night’s CME Update. Hubble Archives http://archive.stsci.edu/prepds/ison/
The total brightness of the comet within a 0″.24-diameter aperture remained unchanged within 0.03 mag over the 19-hr observing window. Broadband photometry yielded Af(rho) = 1376 cm at 589 nm, and 1281 cm at 433 nm, consistent with a red slope of 5 percent per 0.1 micron for the coma dust. A well-defined jet is visible after removing the 1/r brightness distribution. The jet is centered on position angle 290 deg, with a cone angle of 45 deg, a projected length of 1″.6, and a slight curvature towards the north near the end. No temporal change in the morphology is observed over the three epochs, suggesting that the jet is circumpolar.

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