On 11.08.2015 21:45, Alain wrote:

> It's total surface illuminate as 0.013065 (1.3%) Earth.

True, but that is still relatively bright. Consider that
even on Pluto, daylight is comparable to dusk on Earth, see

http://www.skyandtelescope.com/astronomy-news/pluto-time-061620155/

Compared to this level you could still only see very bright stars.

Of course, in space you could simply block the glare of Neptune
with your hand to reveal the stars, unlike an Earth-bound observer
inside the atmosphere at dusk.

Voyager 2 images of Neptune show no background stars either:

http://www.planetary.org/blogs/emily-lakdawalla/2013/05280840-lesser-known-views-of-uranus-neptune.html

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