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Good point, but judging from the images shown in Sky & Telescope, as ISON
approaches the Sun it's near Mercury and Saturn in the sky, a bit below but
near the ecliptic plane, so not visible after sunset. Then, something I'd
missed in the article, the closest approach to the Sun is about Nov. 28, so
close that it may disintegrate due to extreme heating and tidal effects. If
it does emerge, the images shown for the first few days in December show it
moving nearly vertical, so definitely not visible after sunset.
Bruce