posted on Feb, 3 2013 @ 05:03 PM
Sirius was in about the position you described at 11:15 last night. Sirius is also the brightest star in the sky.
The pulsating is called "scintillation", which is just a fancy word for the twinkling of stars. Stars are much more likely to scintillate than
planets, such as Jupiter, because stars are "point-like", while the light from planets is not point-like.
I have seen some stars really twinkle wildly. Arcturus can scintillate several times per second, and flash between a ruddy-orange and