No, but you can buy the small wireless remote to trigger the shutter for
long exposures. That way you won't have to touch the camera.

Hello,
You could get a remote release for your camera (I don't know if cable,
wireless or both are available for your camera, look around). Two other
options:

a) Say you want a photo at ISO 100, 4min, f/5.6; take 8 photos at ISO
100, f/5.6, 30sec and add them (eg in photoshop you can layer them and
use Screen blending, which is close enough, or there are programs to
add them). The problem with this is that read noise may be amplified
(if it's patterned)
b) Take many photos (as above) but average them (eg take 4 photos,
layer them, and give the topmost layer 25% opacity, the next 33%, the
next 50% and the last 100%). The resulting image will still be
underexposed, but much cleaner (less noise), so you can easily boost
the shadows. The same problem as above with read noise, but you can use
higher ISOs here to alleviate this (because random noise gets averaged
out when adding, and read noise is smaller relative to the signal).

I use the second technique a lot with my D200 (using the built-in
intervalometer, but it's not necessary).

I should expand a bit here, but I just spend about an hour taking
photographs in this manner and I'm tired, so please ask! I find that
using the last technique (ie (b) above) is very effective, and the main
problem I have now is that I take photographs in places that are too
dark to see what's going on, with the result that I can only see the
final result at home, when it's too late to recompose, and then have to
go and shoot a better version...

You need to use the remote release.  Set the camera to "bulb", and then
when you press the button on the remote, the shutter opens, and stays
open until you press it again.

The wireless remote is cheap, and very handy to have for that kind of
shooting.  You need not touch the camera at all to release the shutter.