Star ‘plays peekaboo’ with TAU astronomers

A star some 50 light-years from Earth was seen by Tel Aviv University astronomers last week “playing peekaboo,” as it was covered by a celestial body in the solar system that belongs to the “family” of Pluto. The rare event occurred on the night between Tuesday, March 4, and Wednesday, March 5 and was seen at TAU’s Wise Observatory near Mitzpe Ramon. The astronomers explained that this is similar to a solar eclipse, in which the sun is covered by the moon, and a shadow falls on a small region of the Earth. The difference is that here the “sun” was a distant star, and the eclipse was created by an asteroid. The TAU scientists used two telescopes to simultaneously observe the covering of the star. On Tuesday, the celestial body was covered around 10 p.m. The larger telescope took pictures continuously every four minutes, while the newer and smaller telescope did so in the same area every five seconds, which increased the accuracy on when the covering and its conclusion would occur. Dr. Shai Caspi and Dr. Noah Brosch each viewed the images of one telescope on a different computer screen. It was clear at a certain moment by watching both telescope images that one of the stars disappeared and then reappeared. The asteroid covered the star for 43 seconds. The TAU observation was the only one in the world in which the covering was measured with two telescopes simultaneously.