You're likely looking at Sirius, the brightest star in the night sky. It's part of the constellation Canis Major, and it's visible from the Northern Hemisphere during winter months.

However, to be sure, it would help to know:

* What time of year are you observing? Sirius is only visible in the Southern Hemisphere during certain months.

* What direction in the southern sky are you looking?

* How bright is the star compared to other stars in the sky?

With more information, I can give you a more definitive answer!