I think your laptop can meet all your needs...
BUT if you're working "remotely" and the laptop is outside... it may be safer to work with two and accept that the outside machine may get more punishment!
I use an ol' ACER i3 win7 outside for the telescope control (AstroPlanner/ CdC/ EQmod) and image acquisition (AstroArtV5/ PHD2) etc. and Teamviewer to link to a similar spec'd machine in the office for subsequent image processing (AstroArt/ BASS Project).
Hope this helps.
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