What is being dubbed the “Halloween Asteroid”, Asteroid 2015 TB145, is some 400 meters across and will pass safely by at around 17:00 GMT (18:00 CET) on the 31st of October. The space rock was discovered in Hawaii on October 10th. On the 11th of October, just 12 hours after its discovery, the object was confirmed by ESA from its observatory in Tenerife, Spain (full report via ESA web).
If you want to see it with your telescope you will need to calculate it’s coordinates in reference to your location on Earth using JPL Horizons. It will most likely be visible mainly to astronomers from western Europe. Since it is an asteroid it will be difficult to spot due to lack of illumination, its small size, and its trajectory. One would need a decent telescope and a little experience to get a good image. You will not be able to see it with your naked eye, and it is highly doubtful you would be able to spot it with binoculars.
Here is an up close and personal Radar image from NASA:
Happy Halloween everyone! Be safe and enjoy your holiday!